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Replacing the suction head
5
G
Trouble shooting
Fault
Engine will not start or
starts only with difÞ culty
Warm start problems
Engine starts but
dies immediately
carburetor dirty
InsufÞ cient power
System
Observation
Ignition system
Ignition spark OK
No ignition spark
Fuel supply
Fuel tank full
Compression
Inside of engine
system
Outside of engine
Mechanical fault
Starter not engaging
Carburetor
Tank Þ lled
Ignition spark OK
Fuel supply
Tank full
Several systems
Engine idling
may be affected
simultaneously
The felt Þ lter (G/5) of the suction head is used to Þ lter the fuel
taken in by the carburetor.
A periodical visual inspection of the felt Þ lter should be conduc-
ted. For this purpose open the tank cap, and use a wire hook
to pull out the suction head through the tank opening. If the
Þ lter has hardened or is dirty or clogged, replace it.
InsufÞ cient fuel supply can result in the admissible maximum
speed being exceeded. It is therefore important to replace the
felt Þ lter at least every three months to ensure a good fuel supply
to the carburetor.
Cause
Fault in fuel supply or compression system,
mechanical defect
STOP switch is depressed, wiring fault or short
circuit, spark plug or connector defective,
ignition module faulty
Incorrect choke position, carburetor defective,
suction head dirty, fuel supply line bent or
interrupted
Cylinder bottom gasket defective, crankshaft
sealsdamaged, cylinder or piston rings worn
Poor sealing of spark plug
Broken starter spring, broken parts inside engine
Incorrect carburetor setting
Incorrect idle speed, suction head or
Fuel tank vent defective, fuel supply line inter-
rupted, cable or STOP switch faulty
Air Þ lter dirty, carburetor adjustment
incorrect, mufß er clogged, exhaust duct in
the cylinder clogged
19
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