Owner’s Manual
Engine Troubleshooting Guide
Problem
Possible Cause
Solution
Engine does not start
Out of fuel
Refill the tank and follow starting instructions
Engine flooded
Remove the spark plug. Pull the starter cord in a
quick continuous motion. Replace and test
Fuel mixture is old or bad
Mix fresh fuel per instructions
Spark plug is not working
Repair or replace the spark plug
Throttle servo failed/Setup is wrong
Check servo operation. Set it to neutral and reset
the linkage according to your radio and model
manufacturer’s specifications
Carburetor is incorrectly adjusted
Return the carburetor to the factory settings and
retune if necessary
Engine stop switch is malfunctioning
Check and replace the stop switch if necessary
Piston and cylinder is worn
Check the piston and cylinder for wear or damage
and replace if necessary
Wiring is disconnected or damaged
Connect wiring, repair or replace damaged parts
Receiver switch is off
Power on receiver switch
Engine starts then stalls
Out of fuel
Refill the tank and follow starting instructions
Engine may be overheated
Let the engine cool. Reset the carburetor to factory
settings and restart
Engine idle is too low
Follow the instructions to increase idle speed
Carburetor is incorrectly adjusted
Return the carburetor to the factory settings and
retune if necessary
Clutch is slipping or locked-up
Repair or replace the clutch
Fuel mixture is old or bad
Mix fresh fuel per instructions
Throttle servo is improperly set up
Set the servo to neutral and reset the linkage
according to radio and model manufacturer’s
specifications
Clutch or flex shaft cannot turn
Repair or replace damaged parts
Engine is running, but
vehicle does not move
Clutch is slipping or locked-up
Replace damaged parts
Clutch or flex shaft is damaged
Replace damaged parts
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