Question about 2002 kawasaki ZZR 1200

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Running on 3 more so than 4 cylinders,it seems as though no 2 or 3 is playing up,getting good sparks on all 4, carbs have been stripped,checked,cleaned,balanced,fuel pumps have been checked,no issue there,swaped coils and that makes no difference,can you throw some light on what may be the cause please?

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  • tamlewisuk Jul 11, 2010

    thanks,the compression is fine,think it s electrical

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You need three main things for combustion; spark & fueal/air mix & compression.

If you don't have a compression tester the old trick is to stick your thumb over the spark plug hole and crank it. You should get a puff big enough to really blast your thumb out of there.

How many miles on the engine? Did it sit (the rings can fuse/rust to the engine wall if not fogged with oil)?

If you get an compression tester you generally aren't so concerned about the actual # right away but that they are all within about 10% of each other. So like you get 100psi on one the next should be no higher than 110 or lower than 90.

Hope this helps.

Posted on Jul 05, 2010

  • Possum_Phat Jul 12, 2010

    Then check the resistance of your spark plug wires, They usually go bad at the end where everyoone pulls them out by hand rather than use a tool for the job, Should be around12k-14k ballpark, maybe a bit different on cycles but lower than 20k ohms for sure.

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