18
Fault location
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/r
est
Inspect/clean
٤
Engine oil
Replace
٤
*1
Tightening parts
(bolt, nut)
Inspect
٤
Clean/inspect
٤
Fuel tank
Drain fuel
٤
*3
Throttle lever
Check function
٤
Stop switch
Check function
٤
Low-speed rotation
Inspect/adjust
٤
Air cleaner
Clean
٤
Ignition plug
Inspect
٤
Cooling air duct
Clean/inspect
٤
Inspect
٤
Fuel pipe
Replace
٧
*2
Fuel
filter
Clean/replace
٤
Clearance between air intake
valve and air discharge valve
Adjust
٧
*2
Oil
tube
Inspect
٧
*2
Engine
overhaul
٧
*2
Carburetor
Drain
fuel
٤
*3
*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.
