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  1. #21
    Top Dog billman100's Avatar
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    Re: 787 Piston Backwards

    Wasn't plugged in wrong. I am charging the battery overnight and I will give it a go tomorrow with the test light. I also thought about switching the wiring from the back cylinder to the front to see if I can get it to run on the front and rule out faulty wiring.
    Last edited by billman100; 10-18-2017 at 11:11 PM.
    Gen2 BOB JW850BB -Need balls to flip it-

  2. #22
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 787 Piston Backwards

    Quote Originally Posted by billman100 View Post
    This is old, but I but I have the same motor. I put the pistons in backward, broke the rings, realized what I had done, bought new rings, installed the correct direction and now I only get the rear injector to work. I can switch the injectors and they both work, but from my reading only the front injector should work at idle. mine is reverse now. also can't get the front injector to fire at all. replaced the mpem, same result. can someone help before this gets parted out?
    Mpem actually has nothing to do with the fuel injection, there is a Bosch controller on the back side of the MPEM case. it could be faulty.
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  3. #23
    Top Dog billman100's Avatar
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    Re: 787 Piston Backwards

    Is that a replace-able part?
    Gen2 BOB JW850BB -Need balls to flip it-

  4. #24
    Top Dog billman100's Avatar
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    Re: 787 Piston Backwards

    I have a good known Mpem with bosch ecu so ruling that out, I'll just have to go through each wire individually and see if i ind a dead one
    Gen2 BOB JW850BB -Need balls to flip it-

  5. #25
    Top Dog Benflynn's Avatar
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    Re: 787 Piston Backwards

    What does inj trigger off of? 2 sensors like a Polaris stupid stator?, is there a trigger wheel?

  6. #26
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    Re: 787 Piston Backwards

    One sensor on the top of the mag housing , yes the trigger wheel is made onto the flywheel.
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  7. #27
    Top Dog billman100's Avatar
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    Re: 787 Piston Backwards

    The crank position sensor which ohms out correctly in my case.
    Gen2 BOB JW850BB -Need balls to flip it-

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