O.S. Engines 21VZ-M - Manual (Page 16)

30
Symptom
Cause Corrective action
Symptom
Cause Corrective action
Unstable idle
Unsuitable glowplug Use suggested glowplug in the instructions.
Unsuitable fuel
Do not use extremely high nitro or
low oil content fuel.
Extremely light flywheel Add suitable load.
Silencer is disconnected or has play Install silencer securely.
Not reaching expected peak r.p.m.
Insufficient warming up or running-in.
Set the needle only after warming up.
Complete running-in.
Silencer or manifold is not securely connected
or disconnected. Replace seal ring.
Check the connections and secure them.
Fuel tubing from tank is split or broken. Replace the tubing.
31
Symptom
Cause Corrective action
Symptom
Cause Corrective action
Poor response
Deteriorated glowplug Replace glowplug.
Incorrect carburetor settings
Readjust low r.p.m. range with metering
needle and mixture control valve.
Incorrect setting of transmitter Exponential function. Check the transmitter setting.
Poor r.p.m. drop
Throttle position open too far.
Incorrect carburetor installation Install carburetor properly.
Lower the throttle trim on the transmitter.
Too much closing of the needle-valve
and/or mixture control screw. Open the needle-valve an/or mixture control
screw a little.