Troubleshooting; Engine Does Not Start Or Is Hard To Start - Honda 2000 XR50R Service Manual

16. TROUBLESHOOTING
ENGINE DOES NOT START OR IS
HARD TO START
ENGINE LACKS POWER
POOR PERFORMANCE AT LOW
AND IDLE SPEED
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POOR PERFORMANCE AT HIGH
SPEED
POOR HANDLING
ENGINE DOES NOT START OR IS HARD TO START
Possible cause
Check the fuel flow to carburetor - - - - Not reaching carburetor
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••. Clogged fue l line and strainsr
) • Clogged fue l tank breather tube
Reaching carburetor
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2. Perform a spark test
I
- - - - - - - - Weak
Dr
no spark - - - - - - . . Faulty spark plug
· Fouled spark plug
Good spark
· Faulty ignition control module
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· Broken or shorted spark plug wire
3. Remove and inspect spark plug
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Good condition
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· faulty ignition pulse generator
· Faulty engine stop switch or ignition
switch
· Loose or disconnected ignition sys-
temwires
- - - - Wet plug - - - - - - - - - . Flooded carburetor
· Choke valve closed
· Air cleaner dirty
4. Start by following normal procedure--- Engine starts but stops
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••. Improper choke operation
I .
Carburetor incorrectly adjusted
Engine does not start . Intake pipe leaking
· Improper ignition timing (Faulty igni-
tion coil or ignition pulse generator)
· Fuel contaminated
5. Test cylinder compression - - - - - - low compression - - - - - - - . Valve clearance too small
· Valve stuck open
· Worn cylinder and piston ring
· Damaged cylinder head gasket
· Seized valve
· Improper valve timing
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