Dolmar PB-251.4 - Manual (Page 18)

TROUBLESHOOTING
Before making a request for repairs, check a trouble for yourself. If any abnormality is found, control your machine according to the description
of this manual. Never tamper or dismount any part contrary to the description. For repairs, contact Authorized Service Agent or local dealership.
State of abnormality Probable cause (malfunction) Remedy
Failure to operate primer pump Push 7 to 10 times.
Low pulling speed of starter rope Pull strongly.
Lack of fuel Feed fuel.
Clogged fuel filter Clean
Broken fuel tube Straighten fuel tube
Deteriorated fuel Deteriorated fuel makes starting more difficult.
Replace with new one. (Recommended
replacement: 1 month)
Excessive suction of fuel Set throttle lever from medium speed to high
speed, and pull starter handle until engine
starts.
If engine will not start still, remove spark plug,
make electrode dry, and reassemble them as
they originally are. Then, start as specified.
Detached plug cap Attach securely
Contaminated spark plug Clean
Abnormal clearance of spark plug Adjust clearance
Other abnormality of spark plug Replace
Abnormal carburetor Make request for inspection and maintenance.
Starter rope cannot be pulled Make request for inspection and maintenance
Engine does not start
Abnormal drive system Make request for inspection and maintenance
Insufficient warm-up Perform warm-up operation
Choke lever is set to “CLOSE” although engine
is warmed up
Set to “OPEN”
Clogged fuel filter Clean
Contaminated or clogged air cleaner Clean
Abnormal carburetor Make request for inspection and maintenance
Abnormal drive system Make request for inspection and maintenance
Detached throttle wire Attach securely
Engine stops soon
Engine speed does not increase
Abnormal drive system Make request for inspection and maintenance
Detached connector Attach securely
Abnormal electric system Make request for inspection and maintenance.
Engine does not stop.
When the engine does not start after warm-up operation:
If there is no abnormality found for the check items, open the throttle by about 1/3 and start the engine.
Run engine at idling, and set choke
lever to CLOSE.
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