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  1. #1
    ZeeC's Avatar
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    Compression test without a starter

    I am looking at a 96 Hurricane with "electrical problems" and a bad starter, can I get even close to a rough guess on the compression of the motor without a starter to spin it?


  2. #2
    Polarisitis loonatik's Avatar
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    Here's one way:
    Tape or tie the throttle lever open
    All plugs out, of course
    Take off drive shaft cover
    Wrap a rope around the shaft and yank it, be sure you're spinning in correct direction.

  3. #3
    Quote Originally Posted by loonatik View Post
    Here's one way:
    ........
    Wrap a rope around the shaft and yank it, be sure you're spinning in correct direction.

    It's a reed valve engine. Rotation isn't important. Set the timing to ATDC and you can make it run backward.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by loonatik View Post
    ... Take off drive shaft cover

    Wrap a rope around the shaft and yank it...
    This is going to take a lot of strength to equal the cranking speed of a starter motor.

    Perhaps you can find a way to drive the drive shaft (and thereby crank the engine) using a large drill or electric motor. Just don't chew up the splines

  5. #5
    ZeeC's Avatar
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    Quote Originally Posted by K447 View Post
    This is going to take a lot of strength to equal the cranking speed of a starter motor.

    Perhaps you can find a way to drive the drive shaft (and thereby crank the engine) using a large drill or electric motor. Just don't chew up the splines
    The rope idea might work since the plugs are out so not as much compression. I do have an old R/C plane starter that maybe would work on the stub shaft.

  6. #6
    Polarisitis loonatik's Avatar
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    Yup, it's just an idea popped up in my head when I saw your post.
    On a revised note, I'll change the rope to a flat strap, it rolls up to larger diameter making start of the pull much easier. Report back whether it works or not. Thanks

  7. #7

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    pull the headcovers and domes and look at them , if he won't let you walk away

  8. #8
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    Quote Originally Posted by ZeeC View Post
    The rope idea might work since the plugs are out so not as much compression. I do have an old R/C plane starter that maybe would work on the stub shaft.
    you would still have the compression gauge in the one cylinder so the compression would still be there to overcome, I would be very surprised if you could turn over the motor with a rope or strap

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