Viper 24129 User manual

Operator's Manual
Original Operating Instructions
Viper®212cc CARB
4-Cycle Engine
P/N: 26547
ECN: 11346
REV1: 09/30/16
© 2016 Ardisam, Inc.
All Rights Reserved
For more information email
[email protected]
GAS/OIL
RATIO
50:1
Product #’s:
24129

Operator's Manual
Viper® 212cc 4-Cycle Engine
2For more information email [email protected]om or call 800-345-6007 M-F 8-5
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
Registration ........................................................................................................................................................................................................................................2
Warnings and Safety Precautions...........................................................................................................................................................................................3-6
Specications.....................................................................................................................................................................................................................................6
Features ...............................................................................................................................................................................................................................................7
Operation......................................................................................................................................................................................................................................8-11
Maintenance and Storage....................................................................................................................................................................................................12-16
Troubleshooting and Repair................................................................................................................................................................................................17-18
High Altitude Operation..............................................................................................................................................................................................................19
Parts Breakdown.............................................................................................................................................................................................................................20
Warranty .....................................................................................................................................................................................................................................21-23
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) and those of the State of California (CARB).
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 product 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
Viper within 30 days of purchase. (SEE WARRANTY SECTION FOR MORE INFORMATION.) You can register your warranty online by
visiting www.ardisam.com, or by mailing it to: Ardisam, Inc., 1160 Eighth Avenue, Cumberland, WI 54829. If you prefer phone, call
our customer service department at [phone] Mondays through Fridays from 8 a.m. to 5 p.m. CST.

Operator’s Manual
Viper® 212cc 4-Cycle Engine
3
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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 INTHIS PRODUCT AND ITS RE
LATED ACCESSORIES CONTAIN CHEMICALS KNOWN
TO THE STATE OF CALIFORNIA CAUSE CANCER, BIRTH
DEFECTS, OR OTHER REPRODUCTIVE HARM. WASH
HANDS AFTER HANDLING.

Operator's Manual
Viper® 212cc 4-Cycle Engine
4For more information email [email protected]om or call 800-345-6007 M-F 8-5
CAUTION
HOT GASES ARE A NORMAL BYPRODUCT OF A FUNC
TIONING CATALYTIC CONVERTER. FOLLOW ALL SAFE
TY INSTRUCTIONS 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 the exhaust pipe is free of foreign ob-
jects.
• 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 and with the proper equipment. Do not pour
fuel from fuel tank. 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.
• Do not smoke near or while handling engine fuel.
• Never drain fuel from engine in an enclosed area.

Operator’s Manual
Viper® 212cc 4-Cycle Engine
5
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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.
• 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 have engine
debris lter mounted and 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.
• 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
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 engine fuel tank.
• Do not store engine with fuel in fuel tank indoors. Fuel and
fuel vapors are highly explosive.
• During storage, tightly screw down fuel cap.
• 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.
• This engine is designed to operate using a catalytic converter
which contributes to the engine’s compliance with the EPA.

Operator's Manual
Viper® 212cc 4-Cycle Engine
6For more information email [email protected]om or call 800-345-6007 M-F 8-5
SPECIFICATIONS
Displacement / Cycle 212 cc / 4-Cycle
Ignition Type Electronic ignition
Cooling System Forced air cooling
Idling Carburetor Adjust 1900 +/- 100 RPM
Valve Clearance Cold engine-Intake: 0.05 +/- 0.1 mm; Exhaust: 0.05 +/- 0.1 mm
Maximum Torque 8.85 ft-lb @ 2500 RPM
Bore and Stroke 70 x 55 mm
Spark Plug Type For US product with engine 13434 use F6TC, NGK: BP6ES
For European product with engine 14316 use F6RTC, NGK: BPR6ES
Fuel Type Minimum 87 octane gasoline with NO ethanol content
NOTE: If using an ethanol blended fuel, a fuel stabilizer, mixed to
manufacturer specications, is recommended
Fuel Tank Capacity 0.74 gallon (2.8 liters)
Drive Shaft Type Horizontal, 1”straight, (1/4”) keyed shaft with ball bearings. Direction:
counterclockwise (facing shaft); Length: 3-1/5”; Central thread: 3/8”-24UNF
Start Type Recoil
Maximum RPM 3800 RPM
Oil Capacity and Type ~0.53 qt / 16.9 oz (0.5 liters); SAE 15W40 (in freezing weather use 5W30)
Dry Weight 37.5 lb (17 kg)
Overall Dimensions 15.4” x 12.6”x 13.6”(390mm x 320mm x 345mm)
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
engine. Look over them and understand their meanings before operating your engine.
Safety or Hazard Symbols
Hot! Do not touch!

Operator’s Manual
Viper® 212cc 4-Cycle Engine
7
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This is a 4-cycle air cooled engine. The 212cc engine utilizes a horizontal shaft and an oil slinger lubricated system.
FEATURES
WARNING
DO NOT REFUELWHILE SMOKING, NEAR OPEN FLAME,
OR OTHER POTENTIAL HAZARDS.
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHENTHE 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.
Choke
On/O
Fuel Shuto muer
air cleaner
throttle
choke
start
handle
recoil
exhaust
outlet
spark plug
fuel cap
carburetor
fuel tank
oil ll
PTO shaft
oil drain
plug
On/O switch
engine serial
number
fuel shut-o
switch
fuel cup

Operator's Manual
Viper® 212cc 4-Cycle Engine
8For more information email [email protected]om or call 800-345-6007 M-F 8-5
OPERATION
PREOPERATION INSPECTION
1. Check that engine is lled with the proper amount and type
of oil. For the most appropriate type of oil to use, see chart
below.
2. Check that the engine has the 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 provide with the equipment powered
by this engine for any safety and warning precautions and/
or procedures that should be followed before starting this
engine.
CHECKING AND FILLING THE 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. Low/no ethanol blends recommended.
Fuel may contain up to 10% ethanol. 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 1
Note: Do not overll.
3. Replace cap and remove any spilled fuel before operating.
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 REFUELWHILE SMOKING, NEAR OPEN FLAME,
OR OTHER POTENTIAL HAZARDS.
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHENTHE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL TANK.
WARNING
IMPROPERLY MAINTAINING THIS ENGINE, OR FAIL
URE TO CORRECT A PROBLEM BEFORE OPERATION,
CAN CAUSE A MALFUNCTION IN WHICH YOU CAN BE
SERIOUSLY HURT OR KILLED. ALWAYS PERFORM A
PREOPERATION INSPECTION BEFORE EACH OPERA
TION AND CORRECT ANY PROBLEM.
fuel level limit
FIGURE 1

Operator’s Manual
Viper® 212cc 4-Cycle Engine
9
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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.
IMPORTANT
ENGINE IS SHIPPED FROM FACTORY WITHOUT OIL.
YOU MUST ADD ENGINE OIL BEFORE STARTING EN
GINE.
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 and drain plug. SEE FIGURE 2
2. Unscrew dipstick and wipe clean with cloth. SEE FIGURE 2
3. Reinsert and tighten dipstick.
4. Unscrew and check dipstick. If no oil shows on the dipstick,
rell to the top thread of the oil ll oil.
5. Change oil if contaminated.
Viper engine oil may be put in through the oil dipstick hole or
through the oil ll plug opening. If an oil plug is present, loosen
screw and ll oil until oil level is even with top thread in plug hole.
WARNING
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHENTHE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL THE TANK.
upper level
lower level
oil ll area/
dipstick
oil drain plug
FIGURE 2
Choosing Oil Type
30
15W-40
5W-30
-20 0 20 40 60 80 100 °F
-30 -20 -10 0 10 20 30 40 °C
Environment Temperature
SAE

Operator's Manual
Viper® 212cc 4-Cycle Engine
10 For more information email [email protected]om or call 800-345-6007 M-F 8-5
STARTING AND STOPPING THE ENGINE
Note: Operating engine on a steep angle will cause the
engine to lose lubrication and seize.
Review “safety and warning precautions” and “pre-operation
inspection”sections before starting engine.
Engine Start
1. Move the fuel valve switch to the ON position.
SEE FIGURE 3
2. Move the engine to a well-ventilated area, always outdoors,
to prevent carbon monoxide poisoning.
3. Move to an area away from ames or sparks, to avoid ignition
of vapors if present.
4. Remove all debris from air cleaner holes and cooling ns to
ensure proper air ow.
5. Move throttle lever 1/2 way between the FULL and LOW
THROTTLE positions. (This is not necessary on models with
throttle xed at full throttle position.) SEE FIGURE 4
Note: FULL THROTTLE position is when the throttle lever is
all the way to the left and LOW THROTTLE position is when
the throttle lever is all the way to the right.
6. Move the choke lever:
• If the engine is cold or the ambient temperature is low, move
choke lever to the FULL CHOKE position. SEE FIGURE 5
• If the engine is warm or the ambient temperature is high,
move choke lever to the RUN position or 1/2 way between
the FULL CHOKE and RUN positions. SEE FIGURES 5
Note: RUN position is when the choke lever is all the way to
the left and FULL CHOKE position is when the choke lever
is all the way to the right.
WARNING
CARBON MONOXIDE GAS IS TOXIC. INHALATION CAN
CAUSE UNCONSCIOUSNESS AND DEATH.
NEVER LEAVE ENGINE RUNNING WHILE UNATTENDED.
CAUTION
DO NOT STOP ENGINE BY MOVING CHOKE CONTROL
TO CHOKE. BACKFIRE, ENGINE DAMAGE, OR FIRE
MAY OCCUR.
fuel switch
ON position
FIGURE 3
RUN
position
Full Choke
position
FIGURE 5
choke lever
Full Throttle
“fast” position
Low Throttle
“slow” position
FIGURE 4
throttle lever

Operator’s Manual
Viper® 212cc 4-Cycle Engine
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7. Turn the On/O switch to the ON position. SEE FIGURE 6
8 Grasp starter handle and pull out slowly, until resistance is
felt. Without letting it retract, pull rope with a rapid stroke.
DO NOT pull the rope out all the way. Let it return to its
original position slowly. Repeat this step until engine starts.
9. After engine begins operating, move choke lever 1/2 way
between the RUN and FULL CHOKE positions.This position
is considered the HALF CHOKE position. SEE FIGURE 5
10. Run engine for 30 to 45 seconds at HALF CHOKE position
until engine warms up.
11. Once engine is warmed up, slowly move the choke lever to
the RUN position. SEE FIGURE 5
12. Move throttle lever to desired speed. (This is not necessary
on models with throttle xed at full throttle position.)
SEE FIGURE 4
Note: Middle to Low Throttle is meant for use as the engine
idles and Full Throttle for when the engine is in use.
To Stop the Engine:
1. Move the throttle lever to the LOW THROTTLE position and
allow the engine to run at low speeds for 1-2 minutes. (This
is not necessary on models with throttle xed at full throttle
position.) SEE FIGURE 4
2. Turn the On/O switch to the OFF position. SEE FIGURE 7
3. Move the fuel lever to the OFF position. SEE FIGURE 8
4. 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.
Stopping the Engine with the Fuel Lever:
Move the fuel switch to the OFF position and wait until the
engine stops. Avoid letting fuel remain in the carburetor over
long periods, or the passages of the carburetor may become
clogged with impurities and malfunction may result.
FIGURE 6
FIGURE 7
fuel switch
OFF position
FIGURE 8

Operator's Manual
Viper® 212cc 4-Cycle Engine
12 For more information email [email protected]om or call 800-345-6007 M-F 8-5
MAINTENANCE SCHEDULE
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 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 IN WHICH YOU CAN BE SERIOUSLY HURT
OR KILLED. ALWAYS FOLLOW THE INSPECTION AND
MAINTENANCE RECOMMENDATIONS AND SCHED
ULES IN THIS OPERATOR’S MANUAL.
For maintenance schedule see EPA Emissions Control Warranty Statement included with your product.

Operator’s Manual
Viper® 212cc 4-Cycle Engine
13
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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. For temperatures higher than 32º F, use SAE 30 or
SAE 15W-40 motor oil. Use SAE 5W-30 or SAE 10W if temperatures
are below 32º F. See page 9 to reference Choosing OilType chart.
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 cap/wire and move away from spark plug.
SEE FIGURE 9
2. Remove oil drain plug and empty oil into suitable oil
container. Dispose of oil properly. SEE FIGURE 10
3. Reinstall drain plug. Remove dipstick (if applicable) or oil ll
cap. SEE FIGURE 10
4. Fill with appropriate oil to FULL or top line of dipstick;
otherwise to top thread of oil ll hole. SEE FIGURE 10
NOTE: Oil capacity is 0.63 qt / 20.2 oz. See above, under
lubrication, for correct engine oil grade.
5. Reinsert dipstick or oil ll cap and tighten.
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 9
upper level
lower level
oil ll area/
dipstick
oil drain plug
FIGURE 10
spark plug
cap/wire
WARNING
NEVER RUN YOUR ENGINE IN A POORLY VENTILATED
AREA. THE EXHAUST FROM ENGINE MAY CONTAIN
POISONOUS CARBON MONOXIDE. BREATHING IT
WOULD CAUSE SHOCK, UNCONSCIOUSNESS, AND
EVEN DEATH.

Operator's Manual
Viper® 212cc 4-Cycle Engine
14 For more information email [email protected]om or call 800-345-6007 M-F 8-5
!
SPARK PLUG
• For US product with engine 13434 the recommended spark
plug is a F6TC or NGK: BP6ES.
• For European product with engine 14316 the recommended
spark plug is a F6RTC or NGK: BPR6ES.
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. SEE FIGURE 9 on
previous page.
• Reinstall original spark plug, tighten additional 1/2 turn.
• Installing new spark plug, adjust spark plug gap to .030”
(0.6-0.7 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 engine cylinder during operation. Use solvent
and a wire brush to clean the plug and compressed air to
blow out completely.
AIR FILTER
Refer to maintenance schedule for suggestions on when to
service your air lter. Clean lter daily in extremely dusty
conditions.
Removing/Installing Air Filter (SEE FIGURE 11)
1. Remove air cleaner cover.
2. Remove the air lter.
3. Replace with clean or new air lter.
4. Replace air lter cover.
WARNING
FUEL IS HIGHLY FLAMMABLE AND MUST BE HANDLED
WITH CARE. NEVER FILL THE TANK WHENTHE ENGINE
IS HOT OR RUNNING. ALWAYS MOVE OUTDOORS TO
FILL FUEL TANK.
CAUTION
NEVER RUN ENGINE WITHOUT AIR FILTER PROPERLY
INSTALLED. ADDED WEAR AND ENGINE FAILURE MAY
OCCUR IF AIR FILTER IS NOT INSTALLED ON ENGINE.
SEE FIGURE 13.
FIGURE 11
air lter cover
air lter
air lter base
Washing Air Filter
1. Wash in warm water with mild soap until dirt and debris are
removed. Press lter when washing, do not twist.
2. Rinse in warm water until soap and dirt are removed.
3. Dry lter by wrapping in a clean cloth and pressing lter until
it is dry.

Operator’s Manual
Viper® 212cc 4-Cycle Engine
15
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FUEL FILTER
Cleaning Or Replacing Fuel Filter
1. Disconnect spark plug wire from spark plug. Remove spark
plug and protect spark plug hole from debris.
2. Drain fuel from tank before attempting to clean/replace lter.
3. Remove two nuts holding muer to the engine and remove
muer.
4. Remove single tank bolt from fuel tank assembly.
5. Remove two nuts from underside of tank.
6. Gently lift tank o of the engine and disconnect the hose
clamp. SEE FIGURES 12 AND 13
7. Remove fuel tank lter by using proper size socket to turn
lter counter clockwise. SEE FIGURE 14
8. Filter may be washed with kerosene or similar solvent.
9. If lter is extremely dirty or torn replace with new lter.
8. Reassemble and ll with clean fresh gasoline. Check for leaks
prior to starting engine.
CARBURETOR
• Never tamper with the factory setting of the carburetor.
• Contact your service provider or Viper if adjustment is needed.
FIGURE 12
FIGURE 14
fuel lter
fuel pipe
hose clamp
FIGURE 13
fuel hose

Operator's Manual
Viper® 212cc 4-Cycle Engine
16 For more information email [email protected]om or call 800-345-6007 M-F 8-5
TRANSPORTING ENGINE
1. Shut fuel supply o by moving the fuel switch to the OFF
position. Failure to turn fuel o may cause raw fuel to enter
the crank case contaminating the engine oil and providing
insufficient lubrication. SEVERE ENGINE DAMAGE MAY
RESULT. SEE FIGURES 15 AND 16
2. Never transport engine inside an enclosed space or vehicle.
Fuel or fuel vapors may ignite causing serious injury or death.
3. If fuel is present in the fuel tank remove fuel or transport with
an open vehicle in an upright position.
4. If an enclosed vehicle must be used, remove fuel into an
approved red fuel container. DO NOT siphon by mouth.
5. Run engine or drain to use up the fuel in the carburetor and
fuel tank. Always run engine in a well ventilated area.
6. Wipe away any spilled fuel from engine. Allow to dry.
STEPS FOR LONGTERM STORAGE
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) Move fuel switch to the OFF position and start engine. Run
until engine runs itself out of any residual fuel left in fuel cup
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.
WARNING
FAILURE TO FOLLOW MAINTENANCE INFORMATION
CAN CAUSE DEATH OR SERIOUS INJURY.
DO NOT REMOVE FUEL WHILE SMOKING, NEAR OPEN
FLAME, OR OTHER POTENTIAL 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.
fuel switch
ON position
fuel switch
OFF position
FIGURE 15
FIGURE 16

Operator’s Manual
Viper® 212cc 4-Cycle Engine
17
For more information email [email protected]om or call 800-345-6007 M-F 8-5
SPARE PARTS
Only use approved Viper spares. See pages 20-21 for the parts
breakdown and parts list.
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 Viper. 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 from the store where the unit was pur-
chased or direct 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:
1) Part numbers
2) Part description
3) Quantity
4) Model number and serial number
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® 212cc 4-Cycle Engine
18 For more information email [email protected]om or call 800-345-6007 M-F 8-5
TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE REMEDY/ACTION
Engine will not start 1. Power switch o 1. Flip switch to ON position
2. Fuel switch o 2. Check fuel switch is on
3. Spark plug wire disconnected 3. Connect spark plug wire to spark plug
4. Out of fuel 4. Refuel
5. Spark plug wet, faulty or improperly
gapped
5. Clean, replace or gap spark plug
Electric Start 5. Battery discharged 5. Recharge battery
Engine runs rough, oods during op-
eration
1. Dirty air lter 1. Clean or replace air lter
2. Choke partially engaged 2. Turn o choke
3. Carburetor out of adjustment 3. Call factory
Engine is hard to start 1. Stale fuel 1. Drain old fuel and replace with fresh.
Use fuel stabilizer at end of season
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. Clean or replace
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 Ardisam customer service if above remedies fail.

Operator’s Manual
Viper® 212cc 4-Cycle Engine
19
For more information email [email protected]om or call 800-345-6007 M-F 8-5
HIGH ALTITUDE OPERATION
Operating an engine with standard air-fuel mixture at altitudes greater than 3,000 feet will result in a fuel-rich operating condition.
This can lead to increased fuel consumption, increased emissions, and the formation of carbon deposits on spark plugs that can
result in diculty starting engine. To ensure compliance with federal emission standards and avoid performance degradation,
engines must be tted with the appropriate altitude kit when operated at altitudes 3,000 feet or greater.
Altitude Kit Summary
Altitude Kit Identication Number Altitude Kit Part Number Altitude Range (ft above sea level)
Altitude Kit 1# 14926 3000-6000 ft
Altitude Kit 2# 14927 6000-8000 ft
NOTICE:
1. Engines should not be operated at less than 3,000 feet when tted with an altitude kit. Doing so may result in
serious damage to engine.
2. Engines that have been modied with an altitude kit should only be operated at altitudes for which the kit is
designed. Failure to use the appropriate altitude kit at altitudes in excess of 3,000 feet may result in decreased
engine performance, increased fuel consumption and increased engine emissions.
3. Engine operation is not recommended in altitudes greater than 8,000 feet. Doing so will negatively aect engine
performance.
4. For more information on obtaining an altitude kit, see an authorized Viper dealer or contact customer service
at 800-345-6007 Mondays through Fridays from 8 a.m. to 5 p.m. CST, or send an email to [email protected]om.
Installation of altitude kits should be performed by an authorized Viper service center only.

Operator's Manual
Viper® 212cc 4-Cycle Engine
20 For more information email [email protected]om or call 800-345-6007 M-F 8-5
KEY PART # DESCRIPTION QT Y.
12 21277 SPARK PLUG F6RTC; NGK: BPRGES 1
13 14099 FUEL LINE KIT AND CONNECTOR FILTER 1
14 25567 FUEL TANK ASSEMBLY KIT 1
15 25568 FUEL TANK CAP KIT 1
16 14101 MUFFLER COMPLETE KIT 1
18 --- SHORT BLOCK REFERENCE ONLY 1
PARTS BREAKDOWN
PARTS EXPLOSION AND PARTS LIST
KEY PART # DESCRIPTION QT Y.
1 13831 THROTTLE ASSEMBLY KIT 1
2 67201 CYLINDER HEAD COVER KIT 1
3 67178 RECOIL STARTER ASSEMBLY 1
4 67069 ENGINE STOP SWITCH ASSEMBLY 1
5 14940 CARBURETOR REPLACEMENT KIT 1
6 67195 FLY WHEEL AND BLOWER FAN KIT 1
7 25566 IGNITION COIL & HARDWARE KIT 1
8 14097 BLOWER HOUSING KIT 1
9 14098 AIR CLEANER ASSEMBLY 1
10 67173 AIR CLEANER FILTER 1
11 67038 ASSEMBLY DIPSTICK 1
2
1
14,15
14
8
8
5
9
99,10 9
99
3
3
13
8
13 13
13
13
13
13
7
7
8
4
666
6
66
11
18
5
2
1
12
16
16
16
16
16