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  1. #1

    Gp800 not firing in one plug

    I'm rebuilding a 98 gp800 and ran into a problem I can't figure out. Only one plug is getting spark. I ordered a new coil but it's still happening. I'm using a plug tester and have tried swapping everything. This ski only has one coil.

    Help!!??


  2. #2
    Strange. I'm fairly certain on a 98 GP800 that both plugs fire at the same time. That means if you're getting spark on one plug it should be happening on the second plug too, unless there is a problem between the coil and the plug cap.

  3. #3
    I thought the same thing. That is why I wasted $170 on another coil. I was certain that was my problem. I've tried swapping with the old coil, plugging into the other spark plug and can't come up with much else.

    Is it possible that the new coil would be bad too?
    Or possibly I'm not getting enough power to the coil?

  4. #4
    powerstroke specialist mikegp's Avatar
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    you need a new cdi
    it happens to me before and it drove me crazy till by accident i replace the cdi and fix the problem.

  5. #5
    powerstroke specialist mikegp's Avatar
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    i'm not sure if i have one.i have to check,but i believed i have the whole box with cdi,coils wires.just don't know what year its from.

  6. #6
    How much for the assembly?

  7. #7
    powerstroke specialist mikegp's Avatar
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    i have to make sure its compatible with yours. i kind of believe it belongs to 2002 800r. again i have to look for.
    make me a offer.

  8. #8
    to me it doesn't seem possible to be the CDI or the coil. The fact is that it has one pickup, and one output from the CDI to send the voltage to the spark plugs. Every time the pickup see's the magnet, it sends a pulse to the CDI and the CDI sends the voltage to the ignition coil which fires both plugs simultaneously. How is it possible then to only have spark on one side? See diagram.

    Click image for larger version. 

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  9. #9
    powerstroke specialist mikegp's Avatar
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    Quote Originally Posted by tshank123 View Post
    to me it doesn't seem possible to be the CDI or the coil. The fact is that it has one pickup, and one output from the CDI to send the voltage to the spark plugs. Every time the pickup see's the magnet, it sends a pulse to the CDI and the CDI sends the voltage to the ignition coil which fires both plugs simultaneously. How is it possible then to only have spark on one side? See diagram.

    Click image for larger version. 

Name:	gp800ignition.jpg 
Views:	450 
Size:	45.7 KB 
ID:	280332
    it makes perfect sense, but this same issue happen to me a while ago.and i solve it replacing the cdi. i don't know why,or what was the actual cause. i imagine only one thing. a weak voltage from cdi?maybe?.

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