O.S. engine MAX-12TG-P Instruction Manual page 17

Engine fires intermittently but does not run.
Cause
Insufficient fuel in the tank.
Deteriorated glowplug
Clogged fuel filter
Air cleaner and silencer inside is dirty.
Engine overheated
Incorrect clutch release
Glowplug battery disconnected too soon.
Air bubbles in fuel
Unstable idle
Cause
Unsuitable glowplug
Unsuitable fuel
Extremely light flywheel
Silencer is disconnected or has play
Not reaching expected peak r.p.m.
Cause
Insufficient warming up or running-in.
Silencer or manifold is not securely connected
or disconnected.
Fuel tubing from tank is split or broken.
Corrective action
Fill the tank with fuel.
Replace glowplug.
Clean or replace fuel filter.
Replace cleaner element and clean inside silencer.
Wait until engine cools.
Adjust the tension of clutch spring.
Do not disconnect plug battery and wait until
r.p.m. becomes stable.
Install O rings to the tank screws to prevent
bubbles.
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Corrective action
Use suggested glowplug in the instructions.
Do not use extremely high nitro or
low oil content fuel.
Use heavier flywheel
Install silencer securely.
Corrective action
Set the needle only after warming up.
Complete running-in.
Replace seal ring.
Check the connections and secure them.
Replace the tubing.
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