Question about 1991 kawasaki GPZ 500 S - GPX 500 R

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Gpx 500 with misfire on 1 cylinder.

The coils have been checked and the plugs changed.

Thanks for any info.

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Carb pilot/main jet blocked.
check ignition wiring ie wires to coils is anything lose
check tappet clearance
get a compression test done to ensure the engine is OK


hope this helps

Posted on Jan 18, 2009

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CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
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- Fuel injector #1 may be faulty
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Causes:
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Solutions:
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those are misfire codes. Cylinder #1 & #2 in the firing order. Check for bad plugs first. Swap one of the misfires with a non misfire cylinder and see if that cylinder misfires. Or just change the 2 plugs. Put high temp anti seize on the threads if you ever want to remove them later.

Then change the 2 COPs (Coil on Plug).

Finally, check for plugged or bad injectors. CHevron Techron injector cleaner is the best. Add to 1/4 tank of gas for better cleaning.

Report results.

Please rate too. Thanks.

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