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Fault location
*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.
Fault System Observation Cause
Engine not starting or
with difficulty
Ignition system Ignition spark O.K. Fault in fuel supply or compression system, mechanical
defect
No ignition spark STOP-switch operated, wiring fault or short circuit, spark plug
or connector defective, ignition module faulty
Fuel supply Fuel tank filled Incorrect choke position, carburetor defective, fuel supply
line bent or blocked, fuel dirty.
Compression No compression when
pulled over
Cylinder bottom gasket defective, crankshaft seals damaged,
cylinder or piston rings defective or improper sealing of spark
plug
Mechanical fault Starter not engaging Broken starter spring, broken parts inside of the engine
Warm start problems Tank filled ignition spark
existing
Carburetor contaminated, have it cleaned
Engine starts but dies Fuel supply Tank filled Incorrect idling adjustment, carburetor contaminated
Fuel tank vent defective, fuel supply line interrupted, cable or
STOP-switch faulty
Insufficient performance Several systems may
simultaneously be
affected
Engine idling poor Air filter contaminated, carburetor contaminated, muffler
clogged, exhaust duct in the cylinder clogged
Operating time
Item
Before
operation
After
lubrication
Daily (10h) 30h 50h 200h
Shutdown/
rest
Corre-
sponding
Page
Engine oil
Inspect/clean 10
Replace *
1
15
Tightening parts (bolt, nut) Inspect 17
Fuel tank
Clean/inspect –
Drain fuel *
3
17
Throttle lever Check function –
Stop switch Check function 12
Low-speed rotation Inspect/adjust 13
Air cleaner Clean 16
Ignition plug Inspect 16
Cooling air duct Clean/inspect 17
Fuel pipe
Inspect 17
Replace *
2
–
Fuel filter Clean/replace 17
Clearance between air intake
valve and air discharge valve
Adjust *
2
–
Oil tube Inspect *
2
–
Engine overhaul *
2
–
Carburetor Drain fuel *
3
17