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Fault location
Fault
Engine not starting or with
difficulty
Warm start problems
Engine starts but dies
Insufficient performance
Operating time
Item
Engine oil
Tightening parts
(bolt, nut)
Fuel tank
Throttle lever
Stop switch
Low-speed rotation
Air cleaner
Ignition plug
Cooling air duct
Fuel pipe
Fuel filter
Clearance between air intake
valve and air discharge valve
Oil tube
Engine overhaul
Carburetor
*1
Perform initial replacement after 20h operation.
*2
For the 200 operating hour inspection, request Authorized Service Agent or a machine shop.
*3
After emptying the fuel tank, continue to run the engine and drain fuel in the carburetor.
System
Observation
Ignition system
Ignition spark O.K.
No ignition spark
Fuel supply
Fuel tank filled
Compression
No compression when
pulled over
Mechanical fault
Starter not engaging
Tank filled ignition spark
existing
Fuel supply
Tank filled
Several systems
Engine idling poor
may simultaneously
be affected
Before
operation
○
Inspect/clean
Replace
○
Inspect
○
Clean/inspect
Drain fuel
Check function
Check function
Inspect/adjust
Clean
Inspect
Clean/inspect
Inspect
Replace
Clean/replace
Adjust
Inspect
Drain fuel
Cause
Fault in fuel supply or compression system, mechanical
defect
STOP-switch operated, wiring fault or short circuit, spark
plug or connector defective, ignition module faulty
Incorrect choke position, carburetor defective, fuel supply
line bent or blocked, fuel dirty.
Cylinder bottom gasket defective, crankshaft seals
damaged, cylinder or piston rings defective or improper
sealing of spark plug
Broken starter spring, broken parts inside of the engine
Carburetor contaminated, have it cleaned
Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted,
cable or STOP-switch faulty
Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged
After
Daily
30h
lubrication
(10h)
○
○
○
○
○
○
○
17
Shutdown
50h
200h
/rest
*1
○
*3
○
*2
◎
○
*2
◎
*2
◎
*2
◎
*3
○
Corres-po
nding P
9
14
16
―
16
12
12
15
15
16
16
―
16
―
―
16
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