Forest Master Model: FM6DD/FM4DDE
17
Troubleshooting
Most problems are easy to fix. Consult the Troubleshooting Table below for common
problems and their solutions. If you continue to experience problems, or your prob-
lem is not listed, check the forest master website at www.forest-master.com first as
it is continuously updated. If further help is required, contact our technical line on:
0191 276 6553.
Before performing any maintenance procedure or inspection, stop the engine, wait 5
minutes to allow all parts to cool. Disconnect the spark plug (FM6DD) or the power
cable (FM4DDE).
Troubleshooting
Symptom
Possible Cause
The engine won’t
start (Petrol)
• Is the ignition switch in the “ON” position?
• Is the fuel shut-off valve on?
• Are you using fresh, clean fuel? If the fuel is old, change
it. Use a fuel stabilizer if you keep fuel longer than 30
days.
• Is the spark plug clean? If the spark plug is dirty or
cracked, change it. If it’s oily, leave it out, hold a rag over
the plug hole and pull the recoil cord several times to
blow out any oil in the cylinder, then wipe off the plug
and reinsert it.
• Is there sufficient oil? Check the engine oil level and if
necessary top up to the correct level.
• Is there dirt in the carburettor? Undo the bolt holding the
float chamber to the carburettor, empty out any fuel and
clean the inside using fresh, clean petrol. Remove the jet
in the bottom of the carburettor and clean it. Refit the jet
and the float chamber.
• Is the pull start stuck or has more resistance? Check the
drum for blockages.
The motor won’t
start (Electric)
• Is the plug connected to a power outlet?
• If you’re using an extension cable, only use a wire of
2.5mm
2
with a maximum length of 10m. Smaller or large
wires could result in loss of power to the motor.
• Check the fuse in the plug. If it has blown, change it.
• Check the power cable, the plug and the switch for dam-
age (both the supplied power lead and any extension
cable being used). If there is damage, change it.
• Is the motor too hot? The motor is protected with a
thermistor if overheating. Wait for it to cool down and try
again.
