28
TROUBLE SHOOTING
Symptom
Cause
Corrective action
Engine fails to fire.
Fuel tank is empty.
Fuel not reaching the engine.
Fill the tank with fuel and repeat
Priming procedure.
Glowplug element is burnt out.
Glowplug battery discharged
Replace glowplug.
Recharge or replace the battery.
Clogged fuel filter
Air cleaner and silencer inside is dirty.
Clean or replace fuel filter.
Replace cleaner element and clean inside silencer.
Over priming
Remove glowplug and pump out excess fuel.
Fuel tubing is disconnected.
Connect fuel tubing securely.
Fuel tubing is kinked, split or has a hole.
Check the tubing carefully and replace if necessary.
Incorrect servo linkage
Connect correctly after setting servo at neutral.
Reverse rotating direction of starter box.
Mare sure it rotates counter clockwise seen
from crankshaft side.
29
Symptom
Cause
Corrective action
Engine fires intermittently but does not run.
Insufficient fuel in the tank.
Fill the tank with fuel.
Deteriorated glowplug
Replace glowplug.
Clogged fuel filter
Air cleaner and silencer inside is dirty.
Clean or replace fuel filter.
Replace cleaner element and clean inside silencer.
Engine overheated
Wait until engine is cool.
Incorrect clutch release
Adjust the tension of clutch spring.
Starting battery disconnected too soon.
Do not disconnect plug battery and wait until
r.p.m. becomes stable.
Vibration causing air bubbles in fuel.
Install "O" rings to the tank screws to
prevent bubbles.
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 heavier flywheel.
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.
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.
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 heavier flywheel.
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.
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.