Dolmar PBV250 - Troubleshooting Procedures

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Maintenance schedule
General Engine assembly,
screws and nuts
Visual inspection for damage and tightness
Check for general condition and security
After each refuelling Throttle lever
I-O switch
Functional check
Functional check
Daily Sponge element (air lter)
Cooling air duct
Idling speed
To be cleaned
To be cleaned
Inspection
Weekly Spark plug
Mufer
Inspection, replace if necessary
Check and it necessary clean the opening
Quarterly Suction head (gas ling lter)
Fuel tank
To be replaced
To be cleaned
Storing Fuel tank
Carburetor
Empty fuel tank
Operate until engine runs out of fuel
Storage
When keeping the machine in storage for a long time, drain fuel from the fuel tank and carburetor, as follows: Drain all fuel from the fuel tank. Give
a gentle push on the primer pump repeatedly until all fuel is expelled out of the primer pump. Dispose of properly and in accordance with all local
laws.
Remove the spark plugs and add a few drops of oil into spark plug hole. Then, pull the starter gently. Conrm that oil lm covers the engine inside
and tighten the spark plugs.
Clear dirt or dust from outside of engine, wipe them with an oil-immersed cloth and keep the machine locked in a dry, well ventilated location.
Do not store in a closed area where fuel vapors can reach an open ame from hot water heaters, furnaces etc.
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Troubleshooting procedures
Problem System Observation Possible causes
Engine not starting or
starts with difculty
Ignition system Ignition spark is present Faulty fuel supply or compression system, mechanical defect
No ignition spark STOP switch operated, wiring fault or short circuit, spark plug or con-
nector defective, ignition module faulty
Fuel supply Fuel tank lled Incorrect choke position, carburetor defective, suction head (gas line
lter) dirty, fuel supply line bent or interrupted
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 lled Choke in incorrect position
Ignition spark existing Carburetor contaminated, have it cleaned
Engine starts but dies
immediately
Fuel supply Tank lled Incorrect idling adjustment, carburetor contaminated
Fuel tank cap defective, fuel supply line interrupted, cable or STOP
switch faulty
Insufcient performance Several systems
may simultane-
ously be affected
Engine idling Air lter contaminated, carburetor contaminated, mufer clogged, ex-
haust duct in the cylinder clogged