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Thread: I'm an idiot!

  1. #1
    Race, wreck, repeat delagem's Avatar
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    I'm an idiot!

    Ugh. Just discovered during some late-night reading about ALIGNING THE INTAKES on the '92 650....

    Who wants to bet this is why my 750 motor, pulled from a good running, low hours ski, new seals, perfect leakdown and compression numbers, popped a piston the first time I really ran it 2 years ago?

    I discovered this from the factory manual (thanks to all you guys who provide this info!). It was not mentioned in the Clymer, which was the only info I had at the time.

    I even pulled that alignment plate out, and wondered why it was in there....

    Michael


  2. #2
    Bing-A-Ding-Ding-Ding, Brrrrrap! Brrrrrrrrrap!!! Polaris_Nut#1's Avatar
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    could be

  3. #3
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Guess I don't know what your refering to.
    Got any pictures?

  4. #4
    seaobin's Avatar
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    If you had a good leak down test, your intakes were aligned. If you are referring to aligning the intakes and exhaust ports before torquing your cylinders.

    that is unless you did your test without your intake manifolds on.

  5. #5
    Race, wreck, repeat delagem's Avatar
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    I did the leakdown test by putting a thick sheet of rubber between the carbs and the intake manifolds. I think that the manifolds (3 separate intakes on the 92 and 93 models) were a bit out of alignment, but the rubber took up the slack. That's why it passed the leakdown, but was still able to suck air once I took the rubber out and bolted the carbs down using the thin paper gaskets.

    Kennado, what I'm referring to is the part in the factory manual that says to take the plate of stainless that is sandwiched between the carbs and the intake, bolt it to all 3 intakes without the carbs, then place the intakes over the studs on the block. Once the intakes are bolted down, you unbolt the plate, put gaskets on, and then bolt the carbs down.

    I always wondered why that motor popped a piston. It never did it again, and I think that's because I had to unbolt that intake to pull the cyl and piston, and it must have been closer to properly aligned when I reassembled it.

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