O.S. Engines 25XZ - Manual (Page 17)

32
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 heavier flywheel.
Silencer is disconnected or is loose 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.
33
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.
Close metering needle to adequate position
to lower idle r.p.m.
Carburetor not fully seated Install carburetor securely.
Incorrect linkage
Make sure the throttle servo linkage does not
bind and is connected correctly.
Metering needle closed too far. Open the metering meedle a little.