Engine Lacks Power - KYMCO Movie S 125i Service Manual

1
. GENERAL INFORMATION

ENGINE LACKS POWER

1. Raise wheel off the ground
and spin by hand
Wheel spins freely
2. Check tire pressure
Pressure normal
3. Accelerate lightly
Engine speed increase
4. Check ignition timing
Correct
5. Test cylinder compression
Normal
6. Inspect fuel flow
Normal
7. Inspect the fuel injector
Normal
8. Remove spark plug
Not fouled or discolored
Wheels do not
spin freely
Pressure low
Engine speed does
not increase
Incorrect
Incorrect
Abnormal
Abnormal
Fouled or discolored
Movie S 125i
Possible cause
Brake dragging
Worn or damaged wheel bearing
Faulty tire valve
Punctured tire
Air cleaner dirty
Restricted fuel flow
Clogged muffler
Pinched fuel tank breather
Faulty ECU
Faulty ignition pulse generator
Valve stuck open
Worn cylinder and piston rings
Leaking head gasket
Improper valve timing
Faulty pressure regulator
Faulty injector
Faulty spark plug
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