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ENGINE DOES NOT START OR IS HARD TO START
Start by following normal procedure
Engine does not start
Test cylinder compression
Clogged fuel line and strainer
Clogged fuel valve
Not reaching carburetor
Wet plug
Weak or no spark
Engine starts but stops
Low compression
Check fuel flow to carburetor
Reaching carburetor
Remove and inspect spark plug
Good condition
Perform spark test
Good sparkClogged fuel tank breather tube
Flooded carburetor
Throttle valve open
Dirty air clearner
Improperly adjusted pilot screw
Starting enrichment (SE) valve stuck open or damaged
Faulty spark plug
Fouled spark plug
Loose or disconnected ignition system wires
Broken or shorted spark plug wire
Faulty ignition coil
Faulty ignition pulse generator
Faulty engine stop switch
Faulty ignition switch
Faulty ignition control module (ICM)
Improper choke operation
Incorrectly adjusted carburetor
Leaking carburetor insulator
Improper ignition timing (Faulty ICM or ignition pulse generator)
Contaminated fuel
Valve clearance too small
Valve stuck open
Worn cylinder and piston rings
Damaged cylinder head gasket
Seized valve
Improper valve timing
ENGINE LACKS POWER
Raise wheel off the ground and spin by hand
Wheel spins freely
Check tire pressure
Pressure normal
Check for slipping clutch
Engine speed reduced when clutch is released
Accelerate lightly
Engine speed increase
Check ignition timing
Correct
Test cylinder compression
Normal compression
Check carburetor for clogging
Not clogged
Remove and inspect spark plugs
Not fouled or discolored
Check oil level and condition
Correct
To following page
Wheel does not spin
freely
Pressure low
Abnormal
Engine speed does not increase
Incorrect
Low compression
Clogged
Fouled or discolored
Incorrect
Brake dragging
Worn or damaged axle or wheel bearing
Faulty tire valve
Punctured tire
Clutch slipping
Worn clutch discs/plates
Warped clutch discs/plates
Weak clutch spring
Additive in engine oil
Fuel/air mixture too rich or learn
Clogged air cleaner
Restricted fuel flow
Clogged muffler
Restricted fuel tank breather tube
Faulty ignition control module (ICM)
Faulty ignition pulse generator
Valve clearance too small
Valve stuck open
Worn cylinder and piston rings
Damaged cylinder head gasket
Seized valve
Improper valve timing
Carburetor not serviced frequently enough
Plug not serviced frequently enough
Incorrect spark plug used
Oil level too high
Oil level too low
Contaminated oil
POOR PERFORMANCE AT LOW AND IDLE SPEED
Loose carburetor insulator bands
Damaged carburetor insulator
Faulty carburetor insulator O-ring
Faulty spark plug
Fouled spark plug
Loose or disconnected ignition system wires
Broken or shorted spark plug wire
Faulty ignition coil
Faulty ignition pulse generator
Faulty engine stop switch
Faulty ignition switch
Faulty ignition control module (ICM)
Faulty ignition control module (ICM)
Faulty ignition pulse generator
Incorrect
Leaking
Weak or intermittent
spark
Incorrect
Valve train not lubricated properly
Engine knocks
Clogged oil passage
Clogged oil orifice
Worn piston and cylinder
Use of poor quality fuel
Excessive carbon build-up in
combustion chamber
Ignition timing too advance (Faulty ICM)
Lean fuel mixture
Check carburetor pilot screw adjustment
Correct
Check for leaking carburetor insulator
No leak
Perform spark test
Good spark
Check ignition timing
POOR HANDLING
Disconnect fuel tube at carburetor
Fuel flows freely
Check carburetor for clogging
Not clogged
Check valve timing
Correct
Check ignition timing
Correct
Check valve spring
Not weak
Fuel flow restricted
Clogged
Incorrect
Incorrect
Weak
Restricted fuel tube
Restricted fuel tank breather tube
Faulty fuel valve
Clogged fuel strainer
Carburetor not serviced frequently enough
Camshaft not installed properly
Faulty ignition control module (ICM)
Faulty ignition pulse generator
Faulty valve spring
Steering shaft nut or holder too tight
Damaged steering shaft bushing
Damaged steering shaft bearing
Excessive wheel bearing play
Bent rim
Improperly installed wheel hub
Excessively worn swingarm pivot bearings
Bent frame
Tire air pressure incorrect
Faulty shock absorber
Bent tie-rod
Incorrect tie-rod adjustment
Bent swingarm
Bent frame
Improper wheel alignment
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