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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1980 CX 500. Why doesn't left cylinder fire until high rpm?

could be a spark plug failing under the higher compression of the increased rpms
start by changing the plug and or HT lead or coil if independent of the other cylinder

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My 2001 Yamaha YZF-R6 misfires on cylinder #1 when it is cold. Spark plug and coil have been swapped with cylinder #4, still misfire on cylinder #1 only when it's cold.

Hi, Juv69576 and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
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5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
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10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Old dead or bad fuel.
12. Fuel tank vent system plugged or carburetor vent line closed off.
13. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
14. Carburetor controls misadjusted.
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16. Incorrect valve timing.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Jun 16, 2011 | 2001 Yamaha YZF-R6

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My 2009 Kawa Vulan 500 LTD fires on one cylinder

with the bike being new you wouldn't think it's the spark plugs, but you must remember that those are the first plugs that motor has had in it. the plugs are always supposed to be changed at the first service. try changing them and see what happens.

May 10, 2010 | 1995 kawasaki ZX-6R Ninja

1 Answer

Engine misfire

Check the coilpacks, coil leads and clips for shorting or,arcing ( Fire the bike up in the dark and have a look). There are two coil packs so try swapping them and see if the fault changes cylinders, that will isolate the problem.

Mar 20, 2010 | 1982 Yamaha XJ 650

1 Answer

Hi can you tell me the firing order for 87 gpx 750. Regards Paul

The firing order on your bike is 1,3,4,2. These bikes use what is called a wasted spark system. They fire whenever the piston reaches top dead centre.
That is to say they fire on top dead centre compression as well as top dead centre rock-over( exhaust/inlet ). Each coil has two leads on them.
The left coil goes to number 1 & 4 cylinders.
The right coil goes to number 2 & 3 cylinders.

The GPX 750(like most road bikes) have a resistor type spark plug cap on them that was prone to cause problems.

To test the coils/caps, use a multi-meter to test their secondary resistance.

To do this set the meter to kilo-ohms(1000 ohms), place one meter probe in one plug cap & the other probe in the other plug cap( i.e. 1&4, 2&3 )

The meter should read 10kilo-ohms to 15 kilo-ohms.

If it reads higher than that try un-screwing each cap & test the coils with the caps removed by probing the leads. If the coils(without caps)read about 5 to
10 kilo-ohms, check the caps.
The caps should read 5 kilo-ohms each.
It is very common to find these open-circuited.
Replace any open circuit caps.

I hope this has been of some help.
Otherwise if you can be a little more spacific with your problem I will try to help further.

Regards Andrew Porrelli

Jan 28, 2010 | 1987 kawasaki GPX 750 R

1 Answer

My rs250 keeps misfiring on one cylinder checked coils fine new plugs run new cables from cdi misfire has gone lost my rev counter

replace the cdi unit buddy thats the only option im not too sure about the rev counter but get back to me with more info

Oct 14, 2009 | 1995 Aprilia RS 250

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Water in the oil

Check cylinder head and base gaskets. L and R Cover gaskets and fittings.

Apr 05, 2009 | 1991 kawasaki GPZ 500 S - GPX 500 R

1 Answer

HD 1200 Sportster 1997 model misfiring on rear cylinder

hi paul here,
the coil on my bike turned out to be the problem after checking wires, connections and plugs. brought a used single fire. tried it out after being told that coils usaully go all bad not just half. have not had the problem since and i was conteplating buying ignition and coil combo for hundreds. good luck

Mar 22, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

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