Dolmar PB-250.4 User Manual
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17
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
Corresponding
Page
Engine oil
Inspect/clean
9
Replace
*
1
14
Tightening parts (bolt, nut)
Inspect
16
Fuel tank
Clean/inspect
–
Drain fuel
*
3
16
Throttle lever
Check function
–
Stop switch
Check function
12
Low-speed rotation
Inspect/adjust
12
Air cleaner
Clean
15
Ignition plug
Inspect
15
Cooling air duct
Clean/inspect
16
Fuel pipe
Inspect
16
Replace
*
2
–
Fuel filter
Clean/replace
16
Clearance between air intake
valve and air discharge valve
Adjust
*
2
–
Oil tube
Inspect
*
2
–
Engine overhaul
*
2
–
Carburetor
Drain fuel
*
3
16