O.S. engine MAX-18CV-RMX Owner's Instruction Manual page 15

Symptom
Unstable idle
Cause
Unsuitable glowplug
Unsuitable fuel
Extremely light flywheel
Silencer is disconnected or has play
Symptom
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.
Symptom
Poor response
Cause
Deteriorated glowplug
Incorrect carburetor settings
Incorrect setting of transmitter Exponential function. Check the transmitter setting.
Symptom
Poor r.p.m. drop
Cause
Throttle position open too far.
Too much closing of the needle-valve
and/or mixture control screw.
Incorrect carburetor installation
Corrective action
Use suggested glowplug in the instructions.
Do not use extremely high nitro or
low oil content fuel.
Add suitable load.
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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Corrective action
Replace glowplug.
Readjust low r.p.m. range with metering
needle and mixture control valve.
Corrective action
Lower the throttle trim on the transmitter.
Open the needle-valve an/or mixture control
screw a little.
Install carburetor properly.
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