Viper 163cc User manual

Operator's Manual
Original Operating Instructions
Viper®163cc
4-Cycle Engine
P/N: 10667
Rev. 02/01/12
Get parts online at
www.getearthquake.com
Includes Model: 185000

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-52
INTRODUCTION
Congratulations on your investment in quality. Thank you for purchasing a Viper® Engine. We have worked to ensure that your
engine meets the highest standards for usability and durability. With proper care, your engine will provide many years of service.
Please read this entire manual before installation and use. Viper® reserves the right to change, alter or improve the product
and this document at any time without prior notice.
CONTENTS
Introduction .......................................................................................................................................................................................................................................2
Warnings and Safety Precautions...........................................................................................................................................................................................3-6
Specications.....................................................................................................................................................................................................................................6
Features ...............................................................................................................................................................................................................................................7
Operation......................................................................................................................................................................................................................................8-10
Maintenance and Storage....................................................................................................................................................................................................11-14
Troubleshooting and Repair.......................................................................................................................................................................................................15
Parts Breakdown......................................................................................................................................................................................................................16-17
Warranty ..................................................................................................................................................................................................................................... 18-19
FEDERAL EMISSION INFORMATION
Viper® warrants to the retail purchaser, that this small, o-road engine was designed, built and equipped to conform at the time of
initial sale to all applicable regulations of the U.S. Environmental Protection Agency (EPA).
REGISTRATION AND SERVICE
This manual may contain information for several models. Read and keep this manual for future reference. This manual contains
important information on SAFETY, ASSEMBLY, OPERATION, AND MAINTENANCE. The owner must be certain that all the product
information is included with the unit. This information includes the MANUAL, the REPLACEMENT PARTS and the WARRANTIES.
This information must be included to make sure state laws and other laws are followed. This manual should remain with the
engine even if it is resold.
OWNERSHIP RECORDS
Owner’s Name:
Owner’s Address:
City: State/Province: Zip Code/Postal Code:
Model Number: Serial Number:
Date of Purchase:
Notes:
Record the engine model number and serial number in the space provided for
easy reference when ordering parts or requesting technical support. Excluding
emissions-related warranty items, the warranty is valid only if the completed
registration is received by Ardisam within 30 days of purchase. (SEEWARRANTY
SECTION FOR MORE INFORMATION.) Warranty for your Viper® Engine is car-
ried out by registering the product which your Viper® Engine powers. You can
register your warranty online by visiting www.getearthquake.com, or by mailing
it to: Ardisam, 1160 Eighth Avenue, Cumberland, WI 54829. If you do not have
a computer, call our customer service department at [phone] Mondays
through Fridays from 8 a.m. to 5 p.m. CST. model and serial
number location

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 3
WARNINGS AND SAFETY PRECAUTIONS
OPERATOR’S RESPONSIBILITY
Accurate, safe and eective use of this engine is the operator’s
responsibility.
• Readandfollowallsafetyinstructions.
• Maintainthe engineaccordingto directions and schedule
included in this Viper® operator’s manual.
• Ensurethatanyonewhousestheengineisfamiliarwithand
understands all controls and safety precautions.
SAFETY MESSAGES
Your manual contains special messages to bring attention to
potential safety concerns, engine damage as well as helpful op-
erating and servicing information. Please read all the informa-
tion carefully to avoid injury and engine damage.
NOTE: General information is given throughout the manual
that may help the operator in the operation or service of the
engine.
This symbol points out important safety instruc-
tions which if not followed could endanger your
personal safety.
BEFORE OPERATING ENGINE:
WARNING
WARNING INDICATES A HAZARD WHICH, IF NOT
AVOIDED, COULD RESULT IN DEATH OR SERIOUS IN
JURY AND/OR PROPERTY DAMAGE.
CAUTION
CAUTION INDICATES YOU CAN BE HURT OR YOUR
EQUIPMENT DAMAGED IF THE SAFETY INSTRUC
TIONS THAT FOLLOW THIS SIGNAL WORD ARE NOT
OBEYED.
WARNING
CALIFORNIA PROPOSITION 65 WARNING
ENGINE EXHAUST FROM THIS PRODUCT CONTAINS
CHEMICALS KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER, BIRTH DEFECTS, OR OTHER RE
PRODUCTIVE HARM.
IMPORTANT
INDICATES HELPFUL INFORMATION FOR PROPER AS
SEMBLY, OPERATION, OR MAINTENANCE OF YOUR
EQUIPMENT.
WARNING
FAILURE TO COMPLY WITH ALL SAFETY AND OPERAT
ING INSTRUCTIONS CAN RESULT IN LOSS OF ENGINE
CONTROL, SERIOUS PERSONAL INJURY TO YOU AND/
OR BYSTANDERS, AND RISK OF EQUIPMENT AND
PROPERTY DAMAGE.
WARNING
READ ENTIRE OPERATING AND MAINTENANCE
INSTRUCTIONS FOR THIS PRODUCT AND THE
INSTRUCTIONS FOR THE EQUIPMENT THIS ENGINE
POWERS. FAILURE TO FOLLOW INSTRUCTIONS COULD
RESULT IN SERIOUS INJURY OR DEATH. OPERATE THE
ENGINE ACCORDING TO THE SAFETY INSTRUCTIONS
OUTLINED HERE AND INSERTED THROUGHOUT THE
TEXT. ANYONE WHO USES THIS ENGINE MUST READ
THE INSTRUCTIONS AND BE FAMILIAR WITH THE
CONTROLS.
WARNING
CERTAIN COMPONENTS IN THIS PRODUCT AND
ITS RELATED ACCESSORIES CONTAIN CHEMICALS
KNOWN TO THE STATE OF CALIFORNIA TO CAUSE
CANCER, BIRTH DEFECTS, OR OTHER REPRODUCTIVE
HARM. WASH HANDS AFTER HANDLING.

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-54
CAUTION
HOT GASES ARE A NORMAL BYPRODUCT OF A FUNC
TIONING MUFFLER. FOLLOW ALL SAFETY INSTRUC
TIONS TO PREVENT BURNS AND FIRES.
DO NOT ALTER/MODIFY ENGINE:
NEVER ALTER OR MODIFY THE ENGINE FROM THE
FACTORY. SERIOUS INJURY OR DEATH MAY OCCUR IF
ENGINE IS MODIFIED OR ALTERED.
WHEN WORKING ON OR REPLACING PARTS FOR THE
ENGINE OR PRODUCT, YOU MUST ALWAYS DISCON
NECT SPARK PLUG WIRE FROM THE SPARK PLUG AND
KEEP IT AWAY FROM THE SPARK PLUG.
ENGINE SAFETY PRECAUTIONS
Preventing Carbon Monoxide Poisoning
• Never try to ventilate engine exhaust indoors. Carbon
monoxide can reach dangerous levels very quickly.
• Never run engine outdoors where exhaust fumes may be
pulled into a building.
• Never run engine outdoors in a poorly ventilated area where
the exhaust fumes may be trapped and not easily taken
away. (Examples include: in a large hole or areas where hills
surround your working area.)
• Never run engine in an enclosed or partially enclosed area.
(Examples include: buildings that are enclosed on one or
more sides, under tents, car ports or basements.)
• Always run the engine with the exhaust and muer pointed
in the direction away from the operator.
• Never point the exhaust muer towards anyone. People
should always be many feet away from the operation of the
engine and its attachments.
• Do not change the engine governor settings or over-speed
the engine.
• Stay away from rotating parts. Place protective covers over
rotating parts.
• Do not use engine around dry brush, cloth rags, or other
ammable materials.
• Always keep materials and debris clear of muer guard
and other hot engine parts.
• Never operate the engine without the muer guard in
place.
• Always make sure exhaust pipe is free of foreign objects.
• The engine exhaust becomes very hot during operation.
Keep engine at least three feet away from buildings and
other equipment during operation.
• Wear appropriate clothing such as a long-sleeved shirt or
jacket. Also wear long trousers or slacks. Do not wear shorts.
Never wear sandals, sneakers, or open shoes, and never
operate the machine with bare feet.
• Do not wear loose clothing or jewelry. They can get caught
in moving parts. Always keep hands, feet, hair and loose
clothing away from any moving parts on engine and
machine.
WARNING
ENGINES GIVE OFF CARBON MONOXIDE, AN ODOR
LESS, COLORLESS, POISONOUS GAS. CARBON MON
OXIDE MAY BE PRESENT EVEN IF YOU DO NOT SMELL
OR SEE ANY ENGINE EXHAUST. BREATHING CAR
BON MONOXIDE CAN CAUSE NAUSEA, FAINTING OR
DEATH, IN ADDITION TO DROWSINESS, DIZZINESS
AND CONFUSION.
IF YOU EXPERIENCE ANY OF THESE SYMPTOMS, SEEK
FRESH AIR AND MEDICAL ATTENTION IMMEDIATELY.
START AND RUN ENGINE OUTDOORS. DO NOT START
OR RUN ENGINE IN ENCLOSED AREA, EVEN IF DOORS
OR WINDOWS ARE OPEN.
Gasoline Fires and Handling Fuel Safely
Use extra care in handling gasoline and other fuels. They are
ammable and vapors are explosive.
• When storing extra fuel be sure that it is in an appropriate
container and away from any re hazards.
• Prevent re and explosion caused by static electric discharge.
Use only nonmetal, portable fuel containers approved by the
Underwriter’s Laboratory (U.L.) or the American Society for
Testing & Materials (ASTM).
• Always ll fuel tank outside in a well ventilated area. Never
fill your fuel tank with fuel indoors. (Examples include:
basement, garage, barn, shed, house, porch, etc.) Never
ll tank near appliances with pilot lights, heaters, or other
ignition sources. If the fuel has to be drained, this should
be done outdoors. The drained fuel should be stored in a
container specically designed for fuel storage or it should
be disposed of carefully.
• Never remove the fuel cap or add fuel with the engine
running. Stop engine and allow to cool before removing the
fuel cap/and or relling the engine.
• Never drain fuel from engine in an enclosed area.
• Always wipe up excess (spilled) fuel from engine before
starting. Clean up spilled fuel immediately. If fuel is spilled,
do not start the engine but move product and fuel container

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 5
SERVICE
• Always stop the engine whenever you leave the equipment,
before cleaning, repairing or inspecting the unit. Engine
should be turned o and cool, spark plug wire must be
removed from spark plug before any repairs or adjustments
are attempted. Never make adjustments or repairs with the
engine (motor) running. Disconnect the spark plug wire,
and keep the wire away from the plug to prevent accidental
starting. Remove the ignition key if equipped with an electric
start.
• Always wear eye protection when you make adjustments or
repairs.
• Keep all nuts and bolts tight and keep equipment in good
condition.
• Never tamper with safety devices. Check their proper
operation regularly.
• When servicing or repairing the engine, do not tip the
engine over or up unless specically instructed to do so in
this manual. Service and repair procedures can be done with
the engine in an upright position. Some procedures will be
easier if the engine is lifted on a raised platform or working
surface.
• To reduce re hazard, keep engine free of grass, leaves, or
other debris build-up. Clean up oil or fuel spillage. Allow
engine to cool before storing.
• Stop and inspect the equipment if you strike an object.
Repair, if necessary, before restarting.
• Clean and replace safety and instruction decals as necessary.
• To guard against engine over-heating, always keep recoil
housing clean.
• Inspect engine before storage. When not in use, disconnect
spark plug lead and store indoors in a dry place locked or
otherwise inaccessible to children.
• Use only original equipment parts from Viper®, including all
nuts and bolts.
from area. Clean up spilled fuel and allow to evaporate and
dry after wiping and before starting.
• Allow fuel fumes/vapors to escape from the area before
starting engine.
• Test the fuel cap for proper installation before starting and
using engine.
• Always run the engine with fuel cap properly installed on
the engine.
• Never smoke while relling fuel tank or while operating the
engine.
• Do not store engine with fuel in fuel tank indoors. Fuel and
fuel vapors are highly explosive.
• Never pour fuel from engine fuel tank.
• Never siphon fuel by mouth to drain fuel tank.
• Always have an adult fill the fuel tank and never allow
children to ll the engine.
• Never allow an adult or anyone under the inuence of drugs
or alcohol to ll engine.
• When storing gasoline or equipment with fuel in the tank,
store away from furnaces, stoves, water heaters or other
appliances that have a pilot light or other ignition source
because they can ignite gasoline vapors.
BURNS AND FIRES
The muer, muer guard and other parts of the engine be-
come extremely hot during the operation of the engine. These
parts remain extremely hot after the engine has stopped.
Prevention of Burns and Fires
• Neverremovethemuerguardfromtheengine.
• Nevertouchthemuerguardbecauseitisextremelyhot
and will cause severe burns.
• Never touch parts oftheenginethatbecomehot after
operation.
• Alwayskeepmaterialsanddebrisawayfrommuerguard
and other hot parts of the engine to avoid res.

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-56
SPECIFICATIONS
Fire hazards
Wear eye protection
Shock hazard
Hot surfaces
Toxic fumes
Moving parts
Read manual before operation
Slow
Fast
Fuel
Oil
Choke
On/O
Fuel Shuto
SAFETY SYMBOLS
C
G
Operational Control Symbols
The following symbols may be used on your engine to alert you to potential hazards or to give you guidance in operating your en-
gine. Look over them and understand their meanings before operating your engine.
Safety or Hazard Symbols
Hot! Do not touch!
Displacement/Stroke 163cc; 4-stroke
Ignition Type Electronic ignition
Cooling System Forced air cooling
Idling Carburetor Adjust 1600 +/- 160 RPM
Valve Clearance Cold engine-Intake: 0.15 +/- 0.02 mm;
Exhaust: 0.20 +/- 0.02 mm
Maximum Torque 8.8Nm/2500 RPM (6.49 ft. lbs.)
Bore and Stroke 68 mm x 45 mm
Spark Plug Type ~.030” (0.7-0.8 mm gap) Torch F7TC
Gasoline Type Unleaded
Gasoline Tank Capacity Approximately .3 gallons (1.1 L)
Drive Shaft Type 22.2mm, 55mm from end of shaft to mounting surface, 4mm x 26mm full key,
drilled and tapped 3/8-24 UNF-23 mm min., full thread
Start Type Recoil
Speed 3200 RPM
Oil Capacity and Type 0.63 quart (0.6 liters); SAE 30 (in freezing weather use 5W30)
Weight 31 lb, dry (14.1 kg, dry)
Overall Dimensions 397 mm x 355 mm x 339 mm

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 7
FEATURES
WARNING
DO NOT REFUEL WHILE SMOKING,NEAR OPEN FLAME,
OR OTHER POTENTIAL HAZARDS.
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHEN THE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL THE TANK.
IMPORTANT
ENGINE IS SHIPPED FROM FACTORY WITHOUT OIL.
YOU MUST ADD ENGINE OIL BEFORE STARTING EN
GINE. IF ENGINE IS STARTED WITHOUT OIL, ENGINE
MAY BE DAMAGED BEYOND REPAIR AND WILL NOT BE
COVERED BY WARRANTY.
muer
fuel cap
air cleaner
start handle
throttle linkage
primer bulb
ENGINE COMPONENTS
MODEL 185000 163CC VERTICAL SHAFT
This is a 4-cycle air cooled engine. The 163cc engine utilizes a vertical
shaft and an oil slinger lubricated system.
spark plug
oil ll (hidden)

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-58
OPERATION
PREOPERATION INSPECTION
1. Check that the engine is equipped with the proper amount
and type of oil. To determine the most appropriate type of
oil to use, see the chart below.
2. Check that the engine has appropriate amount of fuel.
3. Examine underneath and around engine for signs of oil or
fuel leaks.
4. Inspect fuel hoses and connections for tightness and fuel
seepage.
5. Look for signs of engine damage.
6. Check that all guards and shields are in place, and all screws,
nuts and bolts are tightened.
7. Eliminate excessive debris around muer and recoil starter.
8. Be sure air lter and cylinder ns are clean and free of debris.
9. Check the equipment powered by this engine. Review the
operator’s manual provided with the equipment powered
by this engine for any safety and warning precautions and/
or procedures that should be followed before starting this
engine.
Choosing Oil Type
WARNING
DO NOT ATTEMPT TO START ENGINE IN THE FOLLOW
ING WAYS:
• DONOTusesTarTiNgfluiD.
• DONOTsprayflammableliquiDsOrvapOrs
INTO AIR CLEANER, CARBURETOR OR SPARK PLUG
CHAMBER.
• DO NOT remOve spark plug aND pull ON
STARTER ROPE. FLAMMABLE FUEL CAN SPRAY OUT
AND IGNITE FROM A SPARK FROM SPARK PLUG.
DO NOT REFUEL WHILE SMOKING,NEAR OPEN FLAME,
OR OTHER POTENTIAL HAZARDS.
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHEN THE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL TANK.
CAUTION
FOR THE SAFETY OF THE USER, AND TO MAXIMIZE
THE LIFE OF THE ENGINE, IT IS CRUCIAL TO TAKE TIME
TO CHECK THE CONDITION OF THE ENGINE. PROB
LEMS MUST BE CORRECTED BEFORE OPERATING.
AVOID INJURY! ENGINE OIL IS HAZARDOUS TO YOUR
HEALTH. DISPOSE OF OIL APPROPRIATELY. USE A
SAFE DISPOSAL/RECYCLING CENTER.
CAUTION
ENGINE IS SHIPPED FROM FACTORY WITHOUT OIL.
YOU MUST ADD ENGINE OIL BEFORE STARTING EN
GINE.
WARNING
IMPROPERLY MAINTAINING THIS ENGINE, OR FAIL
URE TO CORRECT A PROBLEM BEFORE OPERATION,
CAN CAUSE A MALFUNCTION WHICH MAY RESULT
IN SERIOUS INJURY OR DEATH. ALWAYS PERFORM A
PREOPERATION INSPECTION BEFORE EACH OPERA
TION AND CORRECT ANY PROBLEM.
OIL TYPE: SAE 5W-30
OIL TYPE: SAE 10W-30
OIL TYPE: SAE 30
TEMP (F) -20 0 20 40 60 80 100
TEMP (C) -30 -20 -10 0 10 20 30

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 9
CHECKING AND ADDING OIL
Be sure the engine is located on a level surface before checking
or relling oil.
1. Clean around oil ll area. SEE FIGURE 1.
2. Slide out dipstick and wipe clean with cloth. SEE FIGURE 1.
3. Reinsert and tighten dipstick.
4. Slide out dipstick and check oil.
5. If oil level is below the marking on the oil dipstick, rell to
upper level. SEE FIGURE 1.
6. Change oil if contaminated.
CHECKING AND FILLING FUEL TANK
Be sure the engine is located on a level surface before checking
or refilling fuel. Use unleaded regular, unleaded premium
automotive fuels only. Commercial fuel may contain up to
10% ethanol. Ethanol additives to fuel are known to cause
deterioration of fuel lines and other fuel components. Viper®
recommends the addition of fuel stabilizer to protect your
engine’s fuel system and prolong the life of your engine. DO
NOT mix oil with fuel.
1. Make sure engine is cool and not running while lling.
2. Remove fuel cap.
3. Fill tank to fuel level limit. SEE FIGURE 2.
Note: Do not overll. Leave room for oil expansion.
4. Replace cap and remove any spilled fuel before operating.
WARNING
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHEN THE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL THE TANK.
upper level
lower level
Figure 1
dipstick
Figure 2
fuel level limit
oil ll area
fuel cap

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-510
STARTING AND STOPPING ENGINE
NOTE: Operating engine on angles greater than 25 degrees
will cause the engine to lose lubrication and seize.
Review “Warnings and Safety Precautions” and “Pre-Operation
Inspection”sections before starting engine.
Manual-Start Engine
1. Move engine to a well-ventilated area, always outdoors, to
prevent carbon monoxide poisoning.
2. Move to an area away from ames or sparks, to avoid ignition
of vapors if present.
3. Remove all debris from air cleaner holes and fuel cap to
ensure proper air ow.
4. Press primer bulb three times. Let bulb fully recover between
each depression. SEE FIGURE 3.
5. Move throttle to“FULL” position. SEE FIGURE 4.
6. Grasp starter handle and pull out slowly, until resistance is
felt. Without letting it retract, pull rope with a rapid stroke.
DO NOT pull out the rope all of the way. Let it return to its
original position slowly. Repeat this step until engine starts.
7. After engine begins operating, move throttle lever to“IDLE”
position. SEE FIGURE 4. Run engine for 30 to 45 seconds at
“IDLE” position until engine warms up.
8. After starting the engine, slowly move the throttle control
lever from the“IDLE”position to desired speed as the engine
warms up. SEE FIGURE 4.
To Stop the Engine:
1. Set the throttle lever to the “IDLE” position and allow the
engine to run at low speeds for 1-2 minutes before stopping.
2. Move throttle to “STOP”position. SEE FIGURE 4.
3. Pull the starter handle slowly and return the handle to its
original position when resistance is felt. This operation will
prevent outside moisture from entering the combustion
chamber.
WARNING
CARBON MONOXIDE GAS IS TOXIC. INHALATION CAN
CAUSE UNCONSCIOUSNESS AND DEATH.
NEVER LEAVE ENGINE RUNNING WHILE UNATTENDED.
Figure 4: Throttle positions
STOP
position
IDLE
position
HALF
position
FULL
position
Figure 3: Primer bulb
D
primer bulb

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 11
MAINTENANCE SCHEDULE
MAINTENANCE ITEM
Every 8 hours
(daily)
Every 50 hours
or monthly
Every 100 hours
or seasonally
Every 300 hours
or yearly
Clean Engine and
Check Bolts and Nuts
X
Engine Oil Check X
(See Lubrication section) Change * (initial 5 hours) X
Oil in Gear Reduction
(if equipped)
Change X
Air Filter Check X X
(See Air Filter section) Clean ** X
Replace X X
Spark Plug (Gap .030”) Check-Adjust X
(See Spark Plug section) Replace X
Fuel Filter Clean *** X
(See Fuel Filter section) Replace
* Perform initial oil change after rst 5 hours of operation, then every 50 hours or every season
** Service more frequently under dusty conditions
*** These items should only be performed by a mechanically procient person or by the servicing dealer
MAINTENANCE AND STORAGE
Please read the maintenance schedule, and observe these
recommended care operating intervals to extend the life of
your engine.
Good maintenance is essential for safe, economical, and trouble-
free operation. It will also help reduce air pollution. To help
you properly care for your engine, the following pages include
a maintenance schedule, routine inspection procedures, and
simple maintenance procedures using basic hand tools. Other
service tasks that are more dicult, or require special tools, are
best handled by professionals and are normally performed by a
technician or other qualied mechanic.
Maintenance, replacement or repair of the emissions control
devices and systems may be performed by any non-road
engine repair establishment or individuals. However, items
must be serviced by an authorized dealer to obtain "no
charge" emissions control warranty service.
The maintenance schedule applies to normal operating
conditions. If you operate your engine under unusual conditions,
such as sustained high-load or high-temperature operation, or
use in unusually wet or dusty conditions, consult your servicing
dealer for recommendations applicable to your individual needs
and use.
CAUTION
TO PREVENT ACCIDENTAL STARTING:
AVOID INJURY! ENGINE MUST BE TURNED OFF AND
COOL AND SPARK PLUG WIRE MUST BE REMOVED
FROM SPARK PLUG BEFORE CHECKING AND ADJUST
ING ENGINE OR EQUIPMENT.
AVOID INJURY! TEMPERATURE OF MUFFLER AND
NEARBY AREAS MAY EXCEED 150° F 65° C. AVOID
THESE AREAS.
AVOID INJURY! CHECK ENGINE OFTEN FOR LOOSE
NUTS AND BOLTS. KEEP THESE ITEMS TIGHTENED.
WARNING
IMPROPER MAINTENANCE, OR FAILURE TO CORRECT
A PROBLEM BEFORE OPERATION CAN CAUSE A MAL
FUNCTION WHICH MAY RESULT IN SERIOUS INJURY
OR DEATH. ALWAYS FOLLOW THE INSPECTION AND
MAINTENANCE RECOMMENDATIONS AND SCHED
ULES IN THIS OPERATOR’S MANUAL.
CAUTION
PRACTICE SAFETY AT ALL TIMES. ENGINE MUST BE
TURNED OFF AND ALLOWED TO COOL AND SPARK
PLUG WIRE MUST BE DISCONNECTED BEFORE AT
TEMPTING ANY MAINTENANCE OR REPAIR.

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-512
ENGINE MAINTENANCE
For daily maintenance checks, review“pre-operation inspection”
section.
Lubrication
Choose engine oil that meets or surpasses the latest API service
classication. Synthetic oils may be substituted for petroleum-
based oils in extreme temperatures. For temperatures higher
than 32º F, use SAE 30 or SAE 10W-30 motor oil. Use SAE 5W-30
or SAE 10W if temperatures are below 32º F. DO NOT USE SAE
10W40 MOTOR OIL.
Note: See “Choosing Oil Type” in “Operation” section for
more information.
Oil Maintenance
After the rst ve hours of operating a new Viper® Engine the
oil should be replaced, and every 50 hours of operating time
thereafter. The oil should be changed every 25 hours if used
under severe conditions, such as in high temperatures or under
heavy loads, otherwise changed weekly. Check oil periodically;
do not overll.
Changing Oil
Be sure the engine is not operating and is located on a level
surface before checking or relling oil. Engine should be warm
for easy removal of oil.
1. Detach spark plug wire and move away from spark plug. If
the engine uses a battery, disconnect at negative terminal.
SEE FIGURE 5.
2. Remove dipstick and carefully tip the engine toward the
dipstick side to empty oil from oil ll area. Empty oil into a
suitable oil container and dispose of oil properly. SEE FIGURE
6.
3. Tip engine back onto a level surface and ll with appropriate
oil to the top of the marking on the dipstick. SEE FIGURE 6.
4. Reinsert dipstick and tighten. SEE FIGURE 6.
CAUTION
OIL IS HAZARDOUS WASTE
AVOID INJURY! ENGINE OIL IS HAZARDOUS TO YOUR
HEALTH. DISPOSE OF OIL APPROPRIATELY. USE A
SAFE DISPOSAL/RECYCLING CENTER.
CAUTION
RUNNING ENGINE WITH AN LOW OIL LEVEL WILL
CAUSE DAMAGE TO YOUR ENGINE. THIS TYPE OF
DAMAGE IS NOT COVERED UNDER WARRANTY.
Figure 5: Spark plug location
spark plug cap
upper level
lower level
Figure 6: Filling and changing oil
dipstick
oil ll area

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 13
!
AIR FILTER
Refer to maintenance schedule for suggestions on when to service
your air lter. Washing lter is not recommended. When dirty,
replace lter (Viper P/N 10905).
Removing/Installing Air Filter (SEE FIGURE 7).
1. Remove air cleaner cover.
2. Remove the air lter.
3. Replace with new air lter.
4. Replace air lter cover.
SPARK PLUG
The recommended spark plug is a Torch F7TC. The spark plug is
located to the left of the valve cover. SEE FIGURE 8.
Checking And Changing Spark Plug
1. Check spark plug every 50 operating hours.
2. Disconnect the spark plug cap, and clean any debris from
around the spark plug area.
3. Remove spark plug and replace if any of the following occur;
pitted electrodes, burned electrodes, cracked porcelain, or
deposits around electrodes.
4. After analysis, seat spark plug and tighten with spark plug
wrench to compress the sealing washer.
• Reinstalloriginalsparkplug,tightenadditional1/2turn.
• Installingnewsparkplug,adjustsparkpluggapto.030”
(0.7-0.8 mm) and tighten additional 1/8 – 1/4 turn.
NOTE: Loose spark plug may overheat and damage engine.
Over tightened spark plug may damage threads in the
cylinder head.
Spark Plug Maintenance
Spark plug should be removed, cleaned and gap adjusted after
approximately fty hours of operating time.
NOTE: A sand blaster should not be used to clean spark plugs.
Microscopic particles remaining in the plug may score the
enginecylinder duringoperation. Usesolvent anda wirebrush
toclean theplug andcompressed air toblowit outthoroughly.
CAUTION
NEVER RUN ENGINE WITHOUT AIR FILTER PROPERLY
INSTALLED. ADDED WEAR AND ENGINE FAILURE MAY
OCCUR IF AIR FILTER IS NOT INSTALLED ON ENGINE.
Figure 7
air cleaner cover
air lter element
air cleaner base
Figure 8
spark plug cap

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-514
WARNING
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHEN THE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL FUEL TANK.
FUEL FILTER
Cleaning Or Replacing Fuel Filter
1. Disconnect spark plug wire from spark plug. Remove spark
plug.
2. Drain fuel from tank before attempting to clean/replace lter.
3. Remove hose clamp closest to gas tank.
4. Pull lter out from end of hose.
5. Filter may be washed with kerosene or similar solvent.
6. If lter is extremely dirty or torn, replace with new lter.
7. Reassemble with clean or new lter, and ll with clean, fresh
gasoline. Check for leaks prior to starting engine.
CARBURETOR
• Nevertamperwithfactorysettingofthecarburetor.
• ContactyourserviceproviderorViper®ifadjustmentisneeded.
TRANSPORTING ENGINE
1. Never transport engine inside an enclosed space or vehicle.
Fuel or fuel vapors may ignite causing serious injury or death.
2. If fuel is present in the fuel tank remove fuel or transport with
an open vehicle in an upright position.
3. If an enclosed vehicle must be used, remove fuel into an
approved red fuel container. DO NOT siphon by mouth.
4. Run engine or drain to use up the fuel in the carburetor and
fuel tank. Always run engine in a well ventilated area.
5. Wipe away any spilled fuel from engine. Allow to dry.
STEPS FOR LONGTERM STORAGE
30 DAYS OR MORE WITHOUT USE
1. Add fuel stabilizer according to manufacturer’s instructions.
2. Run engine for 10-15 minutes to ensure that the stabilizer
reaches the carburetor.
a) Start engine and run until engine runs itself out of any
residual fuel left in carb bowl and fuel lines. (It is normal for
the engine to run two to three minutes before the fuel is
completely out of system.)
3. Remove the remainder of the fuel from the fuel tank into an
approved fuel container.
4. Store engine in its upright position.
5. Remove all debris from engine.
6. Pull the starter handle slowly and return the handle to its
original position when resistance is felt. This operation will
prevent outside moisture from entering the combustion
chamber.
WARNING
FAILURE TO FOLLOW MAINTENANCE INFORMATION
CAN CAUSE DEATH OR SERIOUS INJURY.
DO NOT REMOVE FUEL WHILE SMOKING, NEAR OPEN
FLAME, OR WHEN IN PROXIMITY TO OTHER POTEN
TIAL HAZARDS.
AVOID INJURY! NEVER STORE ENGINE WITH FUEL IN
THE TANK INSIDE A BUILDING. POTENTIAL SPARKS
MAY BE PRESENT CAUSING IGNITION OF FUEL AND
FUEL VAPORS.
WARNING
AVOID INJURY! TO AVOID INJURY OR DEATH, NEVER
SIPHON FUEL BY MOUTH.
AVOID INJURY! CHECK ENGINE OFTEN FOR LOOSE
NUTS AND BOLTS. KEEP THESE ITEMS TIGHTENED.

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 15
TROUBLESHOOTING AND REPAIR
At Viper® we build quality and durability into the design of our products; but no amount of careful design by us, and careful
maintenance by you, can guarantee a repair-free life for your Viper® Engine. Most repairs will be minor, and easily xed by following
the suggestions in the troubleshooting guide in this section.
This section will help you pinpoint the causes of common problems and identify remedies. For more complicated repairs, you may
want to rely on your retailer, an authorized service center, or contact Viper® customer service. Viper® will make the necessary repairs
if a service center is not available. A parts breakdown is located toward the end of this manual. We will always be glad to answer any
questions you have, or help you nd suitable assistance. To order parts or inquire about warranty, call or e-mail us using the contact
information found in this section.
ORDERING REPLACEMENT PARTS
Parts can be obtained directly from the factory. To order parts visit www.ardisam.com or call 1-800-345-6007. For other general
questions, you can e-mail us at [email protected]om. Please include the following information with your order: part numbers; part
description; quantity; and model number and serial number.
SPARE PARTS
Only use approved Viper® spares.
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE REMEDY/ACTION
Engine will not start 1. Power switch o 1. Flip switch to ON position
2. Spark plug wire disconnected 2. Connect spark plug wire to spark plug
3. Out of fuel 3. Refuel
4. Spark plug wet, faulty or improperly
gapped
4. Clean, replace or gap spark plug
5. Stale fuel 5. Drain old fuel and replace with fresh.
Use fuel stabilizer as a future preventative
measure.
Engine runs rough, oods during
operation
1. Dirty air lter 1. Replace air lter
2. Carburetor out of adjustment 2. Call factory
Engine is hard to start 1. Stale fuel 1. Drain old fuel and replace with fresh.
Use fuel stabilizer as a future preventative
measure.
2. Spark plug wire loose 2. Make sure spark wire is securely attached
to spark plug
3. Dirty carburetor 3. Clean carburetor, use fuel stabilizer, new
fuel can
Engine misses or lacks power 1. Clogged fuel tank or fuel lter 1. Remove and clean
2. Clogged air lter 2. Replace air lter
3. Improper carburetor adjustment 3. Call factory
4. Spark plug dirty, improper gap, or
wrong type
4. Replace spark plug and adjust gap to
.030”
Engine runs, then quits 1. Fuel cap not venting 1. Replace fuel cap
Contact a service provider if above remedies fail.

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-516
PARTS BREAKDOWN
163cc ENGINE MAIN PARTS EXPLOSION
1
7
7, 8
2
7
7
2, 7, 10
2, 9,
10, 20
20
9, 10, 20
2, 4
2, 4
2
2
2
17
2
10
10
1010
1
1, 10
23
3, 10
3
3
3
3
27
16
2
15
15
14
18 18
6, 18
24
5
5
5, 10
6
13
13, 28
13
19
25
12, 22
12
12
11, 12, 21
11, 12
18
18
26
2
2, 4
2, 4
2
6
6
6
6
6
12, 22
9, 20 20
10
9
9

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 17
163CC ENGINE MAIN PARTS LIST
REF
NO.
PART
NO. DESCRIPTION QT Y.
1 11211 KIT VALVE COVER 1
2 11228 KIT THROTTLE REPLACEMENT 1
3 11213 KIT MUFFLER REPLACEMENT 1
4 11216 KIT THROTTLE CONTROL SPRINGS 1
5 11217 KIT STARTER CUP AND FAN 1
6 11218 KIT BLOWER HOUSING 1
7 11222 KIT AIR CLEANER COMPLETE 1
8 10905 FILTER ELEMENT AIR CLEANER 1
9 11223 KIT CARBURETOR TUNE UP 1
10 11225 KIT ENGINE GASKETS 1
11 11226 KIT FUEL LINE AND FILTER 1
12 11227 KIT FUEL TANK REPLACEMENT 1
13 11366 KIT RECOIL AND HARDWARE 1
14 10915 IGNITION COIL 1
15 11051 DIPSTICK WITH SEAL 1
16 11009 BREATHER TUBE 1
17 11149 SWITCH ENGINE SHUT OFF 1
18 11232 KIT MOUNTING BRACKETS AND RODS 1
19 10871 ENGINE SHROUD 1
20 11233 KIT CARBURETOR REPLACEMENT 1
21 11008 FUEL FILTER 1
22 11283 GAS CAP W/SEAL 1
23 64212 SPARK PLUG TORCH F7TC 1
OTHER PARTS
(Contact customer service for ordering information)
24  FLYWHEEL
25 -- BOLT M5 X 0.8 X 16 MM HHF GR8.8 ZN
26 -- BOLT M6 X 1.0 X 12 HHF GR8.8 ZN
27 -- SHORT BLOCK
28 -- CLIP NUT
NOTE: Service kits contain multiple parts.

Operator's Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-518
163CC VIPER® ENGINE
WARRANTY TERMS AND CONDITIONS
PRODUCT WARRANTY: 2YEAR LIMITED WARRANTY
Ardisam, Inc., Manufacturing Company warrants its Viper® Engines under a two-year limited warranty to be free from defects
in materials and workmanship for the service life of the product not to exceed twenty-four consecutive months from the date
of purchase for consumer applications. As an Ardisam Viper® small-engine owner, you are responsible for executing proper
maintenance listed in your Operating and Maintenance Instructions. The warranty period begins on the date of purchase by
the rst retail consumer or commercial end user, and continues for the period of time stated above.
This warranty applies only to products which have not been subjected to negligent use, misuse, alteration, accident, unauthor-
ized parts, failure to use proper fuel and oil, or if repairs have been performed at non-authorized service centers. This warranty
supersedes all other warranties either expressed or implied and all other obligations or liabilities on our part. Ardisam, does
not assume, and does not authorize any other person to assume for us, any liability in connection with the sale of our products.
To be at “No Charge,” however, warranty work must be sent directly to Ardisam, Inc., or one of our authorized service
centers and performed by them.
To obtain warranty service and replacement instructions, you must contact our customer service department for warranty au-
thorization. If you choose to ship your product to Ardisam for warranty repair, you must rst have prior approval from Ardisam
by calling our customer service department for a return material authorization number (RMA#). Under these circumstances, all
items must be shipped prepaid. Ardisam will at no charge, repair or replace, at their discretion, any defective part which falls
under the conditions stated above. Ardisam retains the right to change models, specications and price without notice. This
warranty applies to the original owner with a proof of purchase and is not transferable.

Operator’s Manual
Viper® 163cc 4-Cycle Engine
Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5 19
EXPLANATION OF EMISSIONS CONTROL
WARRANTY PROVISIONS
Viper® Engines are designed, built and equipped to meet all EPA requirements.
It warrants that it is free from defects in material and workmanship that could
cause failure to the warranted part; and that it is identical in all material
respects to the engine described in the manufacturer's application for
certication. When a warrantable condition exists, Ardisam will repair your
engine at no cost to you, including parts and labor. The engine emissions
label will indicate certification information. If the purchaser is in need of
a warrantable repair and is not within 100 miles distance from an Viper®
authorized repair center, Viper® will pay for shipping costs to and from an
authorizedViper® repair center. All such requests must rst be pre-approved
by customer service prior to shipping.
Listed below are the parts covered by the emissions control systems
warranty. Some parts listed below may require scheduled maintenance
and are warranted up to the rst scheduled replacement point for that
part. Coverage under this warranty includes only the parts listed below (the
emission and evaporation control systems) if so equipped:
• AirFilterAssembly(onlytotherstscheduledreplacementpoint)
• FuelFilter(onlytotherstscheduledreplacementpoint)
• Carburetor
• FuelLines,FuelLineFittingsandClamps
• FuelMeteringValve(ifequipped)
• EvaporativeSystem(ifequipped)
- Canister (if equipped)
- Canister lter (if equipped)
- Vapor hose (if equipped)
- Orice connector (if equipped)
-Fuel tank
-Fuel cap
-Primer bulb canister (if equipped)
• SparkPlugs
• MagnetoIgnitionSystem
• MuerAssembly
LIMITATIONS
The Emission Control Systems Warranty shall not cover any of the following:
a) Repair or replacement required because of misuse or neglect, improper
maintenance, repairs improperly performed or replacements not
conforming to Ardisam specications that adversely aect performance
and/or durability and alterations or modications not recommended or
approved in writing by Ardisam.
b) Replacement of parts and other services and adjustments necessary for
required maintenance at or after the rst scheduled replacement point;
c) Consequential damages such as loss of time, inconvenience, loss of use
of the engine or equipment, etc.
d) Diagnosis and inspection fees that do not result in eligible warranty
service being performed; and
e) Any add-on or modied part, or malfunction of authorized parts due to
the use of add-on or modied parts.
The warranty on emissions-related parts is as follows:
• Anywarrantedpartthatisnotscheduledforreplacementasrequired
maintenance in the owner's manual supplied, is warranted for the
warranty period stated above. If any such part fails during the period
of warranty coverage, that part will be repaired or replaced at no charge
to the owner. Any such part repaired or replaced under the warranty
will be warranted for the remaining warranty period.
• Anywarrantedpartthatisscheduledonlyforregularinspectioninthe
owner's manual supplied, is warranted for the warranty period. Any
such part repaired or replaced under warranty will be warranted for the
remaining warranty period.
• Any warrantedpart thatisscheduled forreplacementasrequired
maintenance in the owner's manual supplied, is warranted for the period
of time prior to the rst scheduled replacement point for that part. If
the part fails prior to the rst scheduled replacement, the part will be
repaired or replaced at no charge to the owner. Any such part repaired
or replaced under warranty will be warranted for the remainder of the
period prior to the rst scheduled replacement point for the part.
• AddonormodiedpartsthatarenotexemptedbytheAirResources
Board may not be used. The use of any non-exempted add on or
modied parts by the owner will be grounds for disallowing a warranty
claim. The manufacturer will not be liable to warrant failures of warranted
parts caused by the use of a non-exempted add on or modied part.
These items will be covered for a period of two years from the date of the
original purchase. Ardisam warrants that: the components are designed,
built and equipped so as to conform with all applicable regulations adopted
by the EPA; that they are free from defects in material and workmanship
that could cause failure to the engine or other; and that the components
used are identical in all material respects to the engine described in the
manufacturer's application for certication. The warranty period begins
on the date the engine is originally purchased.
MAINTENANCE AND REPAIR REQUIREMENTS
The owner is responsible for the proper use and maintenance of the engine.
Viper® recommends that all receipts and records covering the performance
of regular maintenance be retained in case questions arise. If the engine
is resold during the warranty period, the maintenance records should be
transferred to each subsequent owner. Ardisam reserves the right to deny
warranty coverage if the engine has not been properly maintained; however,
Ardisam may not deny warranty repairs solely because of the lack of repair
maintenance or failure to keep maintenance records.
Normal maintenance replacement or repair of emission control devices
and systems may be performed by any repair establishment or individuals;
however, warranty repairs must be performed by an Viper® authorized
service center. Any replacement parts or service that is equivalent in
performance and durability may be used in non-warranty maintenance
or repairs, and shall not reduce the warranty obligations of the engine
manufacturer.

Check for parts online at www.getearthquake.com or call 800-345-6007 M-F 8-5
Viper® Engines, Division of Ardisam, Inc.
1160 8th Avenue, PO Box 666
Cumberland, WI 54829
800-345-6007 | Fax [phone]
E-mail: [email protected]om
All weights, specications and features are approximate and are subject to change without notice. Due to continuous product
improvements, product images may not be exact. Items used for props not included. Some assembly may be required.