Rato 125-S User manual

125-S 145-S 170-S Gasoline Engine
(Vertical Shaft)
Owner’s Manual

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PREFACE
Thank you for choosing a small general gasoline engine of our company.
The manual gives information with respect to operation and maintenance
of the
125-S 145-S 170-S general gasoline engine, and be sure to read
it
insure user’s safety and get the best results of the engine operation. If a
problem should arise or if you have any questions about your gasoline
engine, consult an authorized our company servicing dealer.
The vertical shaft gasoline engine products in this Owner's Manual are
mainly used for the lawn mower and mini tiller.
All information and diagrams of this manual are in accordance with the
newest products at the publishing time. If revision and other change of
the information descried in this manual are a little different from the
actual status, our company will explain it. Our company reserves the right
to make change at any time without notice and without incurring any
obligation. No part of this publication may be reproduced without written
permission.
This manual should be considered a permanent part of the generator and
should remain with the generator if resold.
carefully

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9. Refuel the fuel tank not too full so as to avoid fuel’s spilling out. If there
is spilled fuel around, be sure to clean it thoroughly before starting.
10. Do not run the engine in airtight or ill-ventilated places.
11.
the engine stops. Never touch it, or you may get burns. Transport or
store the engine with it cooling down entirely.
12. Inclination of gasoline engine which indicates the included angle
between crankcase cover and level is less than 26°during its runing.
If that is over 26°,oil will flow into combustion chamber and burn
with white smoke, which will cause gasoline engine has lower power
and higher emission.
13. Safe warning label:
Please carefully read warning label before operating. Our company will
not assume any responsibility for person hurt, or equipment damaged
caused by disregarding this warning label.
SAFETY PRECAUTIONS

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II. PARTS DESCRIPTION
1. Feature
MUFFLER
SPARK PLUG
CARBURETOR
AIR CLEANER
FUEL TANK
CAP
STARTER GRIP
FUEL TANK
OIL DIPSTICK

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2. Model No.
MODEL NO.
FINISHED
PRODUCT NO.
PARTS DESCRIPTION
SER. NO.

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III. PRE-OPERATE INSPECTION
1.Engine Oil
Engine oil is a key factor in deciding the engine’s performance. Do not
apply engine oil with additives or 2-stroke gasoline engine oil, because
they haven’t enough lubrication, and may shorten the engines service life.
Check the engine with it stopped on a level ground.
Engine oil capacity: 125-S/145-S/170-S 0.3L~0.5L
Engine oil recommended: SAE15W-40
As viscosity varies with regions and temperatures, SJ class oil is
recommended.
Check method:
1) Remove the dipstick and clean it.
2) Reinsert the dipstick into the oil Filling hole without screwing it, and
check oil level.
3) If the oil level is too low, add the recommended engine oil up to the
oil upper level.
4) Reinstall the dipstick.
PRE-OPERATE INSPECTION

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Engine oil change:
Used engine oil may cause skin cancer if repeatedly left in contact with
the skin for prolonged periods. It is still advisable to thoroughly wash
your hands with soap and water as soon as possible after handling used
oil. Please dispose of used engine oil in a manner that is compatible with
the environment.
1) Screw the oil dipstick out.
2)
PRE-OPERATE INSPECTION
OIL DIPSTICK
OIL HOLE

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2. Air Cleaner
Never run the engine without an
air cleaner, or severe wear of the
engine may be resulted in.
1) Remove the air cleaner housing.
2) Remove foam element or paper element, paying attention to prevent
dust and foreign matter entering into air cleaner.
3) Check, clean or replace damaged air cleaner parts.
4) Reinstall the air cleaner parts back.
3. Fuel Check
1) Remove the fuel tank cap and
check fuel level.
2) If the level is too low, refuel the
tank. Remember adding fuel not
over the fuel upper level.
AIR CLEANER
ELEMENT 1
AIRFILTER
COVER
AIR CLEANER
ELEMENT 2
FUEL
FUEL UPPER LEVEL
FUEL TANK
PRE-OPERATE INSPECTION

11
1. Gasoline is extremely flammable and is explosive under certain
conditions.
2. Refueling in a well-ventilation area with the engine stopped. Do
stored or where the fuel tank is refueled.
3.
neck). After refueling, make sure the fuel tank cap is set back
securely.
4. Be careful not to spill fuel when refueling. Spilled fuel or fuel
vapor may ignite. If any fuel is spilled, make sure the area is dry
before starting the engine.
5. Avoid repeated or prolonged contact with skin or breathing of fuel
vapor. Keep out of reach of children.
Fuel tank capacity: 0.8L
Only use unleaded gasoline and recommend gasoline grade 90#over.
Unleaded gasoline can reduce gasoline engine carbon deposit and prolong
the exhaust system service life.
Never use contaminated gasoline or mixed gasoline with oil. Don’t allow
the dust, foreign matter or water entering into fuel tank.
Fuel may damage the oil paint and plastic. Be careful not to spill fuel
when refueling. Any damage due to oil spilling is not within valid
warranty.
PRE-OPERATE INSPECTION

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STARTING THE ENGINE
IV. STARTING THE ENGINE
1. Starting method:
Starting primer bulb operation is important operation of the starting
engine. For cold starting, slightly press the primer bulb one to three
times in succession and quickly pull the recoil cable grip. For hot
starting, directly pull the starter cable grip.
2. STARTING THE ENGINE
Pull the starter grip lightly until resistance is felt, then, briskly pull to
syncline upper 30 degree out.
Don’t allow the starter grip to snap back against the engine. Return
it gently to prevent damage to the starter
PRESS PRIMER
BULB ONE TO
THREE TIMES.
THEN,PULL
CABLE GRIP.
START ENGINE

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V. STOPPING THE ENGINE
If the engine is controlled by brake lever, only turn the brake lever to
“CLOSE” position for stopping engine
Sudden stopping at high speed under heavy load is forbidden,
otherwise damage will result.
STOPPING THE ENGINE
BRAKE LEVER
OPEN
CLOSE

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Frequency
Items
Every
time
First
month or
10 hrs of
operation
Thereafter,
every 3 months
or 30hrs of
operation
Every 6
months or 50
hrs of
operation
Every year
or 100 hrs
of
operation
Engine oil
Check-
Refill
√
Change √√
Air filter
element
Check
√
Clean
√
Change
√
Spark plug
Clean-
adjust
√*
Spark
arrester
Clean
√
Valve
clearance**
Check-
adjust
√
Fuel hose
Check
Every 2 years (change if necessary)
Cylinder
head, Piston
Remove
carbon
deposits
Every 125 hours

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