657 engine/flywheel/armature
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  1. #1
    PWCToday Newbie
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    657 engine/flywheel/armature

    I picked up a 93 SPX in parts and pieces. The engine in it, sitting loose, has 657 marking on the mag housing. I got it put together and installed. Went to start it and all I got was a backfire out the exhaust. I followed the book on installation of the rotary valve. I checked the ignition timing like the book says with a depth gage on mag cylinder and then check with a strobe/timing light with it spinning free(plugs out). It looks to be way out of time. It looks like the mag housing and guts have been taken out at one time. Here's the question: how do I know I have a matched set of 657 engine with the correct flywheel and armature?

  2. #2
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 657 engine/flywheel/armature

    You don't but it sounds like you possibly have the wrong flywheel on your engine which will indeed throw it way out of time, there are two different flywheels on a 657 the early style with the separate CDI box and the later style with the CDI integral with the MPEM.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    I was 300SXing when 300SXing wasn't cool !

  3. #3
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    Re: 657 engine/flywheel/armature

    The flywheel I have looks like most any other flywheel out there for sale for a 657(non X) engine. How do I know if I have the early or later model?

  4. #4
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    Re: 657 engine/flywheel/armature

    and it has the 5-wire stator

  5. #5
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 657 engine/flywheel/armature

    Quote Originally Posted by brm1626 View Post
    The flywheel I have looks like most any other flywheel out there for sale for a 657(non X) engine. How do I know if I have the early or later model?
    Its very hard to tell them apart...the only difference is the keyway is clocked a few degrees different. I have still cant tell the difference between the two. I always go with a known flywheel & always mark them when I come across one.

    5 wire stator is the early yellow motor & 93-94 XP

  6. #6
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    Re: 657 engine/flywheel/armature

    Really the only way to tell the difference is to look at them side by side and see where the keyway is located at
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    I was 300SXing when 300SXing wasn't cool !

  7. #7
    PWCToday Newbie
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    Re: 657 engine/flywheel/armature

    any pics I can go to?

  8. #8
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 657 engine/flywheel/armature

    post up a pic of yours after you take it off and I will see if I can help
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    I was 300SXing when 300SXing wasn't cool !

  9. #9
    PWCToday Newbie
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    Re: 657 engine/flywheel/armature

    Here is the flywheelIMG_1181.JPG

  10. #10
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 657 engine/flywheel/armature

    okay from my research I believe the four wire flywheel is part number 032000-8420 and has vc150 stamped on it, the five wire stator flywheel should be part number 032000-8420 and have vc139 stamped on it, I will look today and see if I can locate a four wire stator flywheel and see shere the keyway position is in relation to the magnets
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    I was 300SXing when 300SXing wasn't cool !

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