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  1. #1

    98GP1200 Spark Issue

    Any advice greatly appreciated. Middle cylinder spark plug doesnt seem to be igniting fuel. When plug tested for spark against motor ( earth ) i can see spark but dont know if it is a low ( not enough ) spark condition.

    When flushing running on hose in backyard the ski sounds like it is running on all 3 cylinders ( crisp throttle response ) but as soon as loaded up in water it has low power. Have tried disconnecting middle spark plug cap while in water and no difference in power when operating ( same as when cap is on plug ).

    Coil resistance ( primary and secondary ) ok, same for cap resistance.

    Not sure where to go from here. New plugs fitted , gap checked.


  2. #2
    Flying Scotsman's Avatar
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    Trim your coil wire at the sparkplug end.
    Cap unscrews.

  3. #3
    Tried that but no difference. Also swapped plugs around and no difference. Is there such a thing as a spark tester?

  4. #4
    Flying Scotsman's Avatar
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    I wuld go ahead and check the coils if they spec out its not the coils.

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    crashhard's Avatar
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    if its not the coils try switching out the cdi, had the same problem with one, ran great on the hose, did 3-5mph in the water, cdi was the problem.

  6. #6
    Coils ok so will find a cdi somewhere and test.

    Thanks

  7. #7
    Flying Scotsman's Avatar
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    I had a pinched pick up coil wire once ohmed out good but would not fire in the water.

  8. #8
    ....back from the dead.... J-ME's Avatar
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    It is easy to pinch wires putting the cover on that small electrical box.

    Check the internal grounds also.

  9. #9
    Moderator OsideBill's Avatar
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    I ran an extra ground from my battery to my electrical box and then to my motor. This was for a different issue.

    I did have a problem with mine not getting spark at all it ended up being the stator all three cylinders were affected though. it would start then quit it would not start at all then it would start drove me nuts. I ended up going through the manual and learned quite a bit on these motors. The manual has all the tests for the electrical. It is way better than the newer GPR manuals in this respect. Do you have a manual?
    Last edited by OsideBill; 02-06-2008 at 01:17 AM.

  10. #10
    Will be getting my hands on apparent good 2nd hand ignition/electrical/cdi box assy on sunday. Will start with replacement of coil and work my way up from there. No charge until i take whatever i need.

    Yep, got manual.

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