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  1. #1

    surging at 3/4 to wot

    Ok guys I have been searching and searching with no results. So here goes. I just finished installing my factory triples, f/a's, and riva cdi. I take it for a test run today, Im taking it easy trying to feel her out. everything seems to be fine. So I give her some more throttle still running great,I run for about 10 mins and then running about 3/4 throttle it just shuts off. So it cranks right back up no problem, I think well maybe im low on fuel so i ease back and put gas in it. cranks right up runs perfect idle, and half throttle, anything over 3/4 it starts surging. what would cause something like this?

    I plan on doing a compression check first thing in the morning, but its just driving me crazy.


  2. #2
    Hydrotoys's Avatar
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    85
    What did you do to the carbs?

    Sounds like you siezed it.

  3. #3
    seized it!! oh no.

    120 pilots
    145 mains
    95 gram springs
    and new needles. I forget what they are.

    from research i read it should be rich so thats where i started to be safe

  4. #4
    Hydrotoys's Avatar
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    85
    Looks good. I just know that the I-bodies have a lean spot at 3/4 throttle. Always have.

  5. #5
    would it still crank, idle, cruise at half throttle if it was seized?

  6. #6
    Hydrotoys's Avatar
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    Yup. That is what caught my eye. Sounds like a mild seizure.

    Avoid the 3/4 throttle range. WOT is usually safer.

  7. #7
    ok, what should I do now? I was gonna check the compression in the morning.

  8. #8
    Hydrotoys's Avatar
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    Good.
    Pop the head and inspect too. You might be fine. The gpr is very forgiving.

  9. #9
    1.Check compression
    2. pull head and inspect for damage

    thanks hydrotoys, I appreciate your advice and time. i'll check everything out in the moring.

  10. #10
    Hydrotoys's Avatar
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    Could be:
    -ignition
    -coils
    -wires (they get old, so if you ride in salt-air they get goofy in a hurry)
    -Water intrusion if base gasket assembled wrong.
    -If you have a case leak, or some other leak, you can lean out. Did you pressure test the engine?

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