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SERVICE MANUAL
Maintenance
Ignition System:
CAUTIoN
• C.D.I ignition system is set by manufacturer so it can not be adjusted.
• Ignition timing check procedure is for checking whether CDI function is normal
1. Connect tachometer and ignition light.
2. Start engine.
3. As engine hits idle speed, 1600 rpm, aim at the mark “F” with the ignition light.
Increase engine speed to 5500 rpm to check ignition advance degree. If indent is located within the ignition
advance degrees, it is means that the ignition advance degree is in normal.
If ignition timing is incorrect, check CDI set, pulse rotor and pulse generator.
Replace it if malfunction of these parts is found.
Cylinder Compression Test:
Warm up engine.
Turn off the engine.
Remove the seat.
Remove spark plug cap and spark plug.
Install compression gauge.
Full open the throttle valve, and rotate the engine by means of starter motor.
CAUTIoN
• Rotate the engine until the reading in the gauge stops increasing.
• Usually, the highest pressure reading will be obtained in 4 - 7 seconds.
Compression pressure: 130 PSI (+ / - 25PSI)
Check following items if the pressure is too low:
• Incorrect valve clearance.
• Leaking Valve.
• Cylinder head leaking, piston, piston ring and cylinder worn out.
If the pressure is too high, this means there may be carbon deposits in combustion chamber or piston head.
Summary of Contents for 1500
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