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  1. #1
    PWCToday Newbie njvx's Avatar
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    Jan 2010
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    Piston bore clearance 650sx

    So ive been googling this a bit and i cant seem to find the answer to my question.
    Stock cylinder bore is 76.00mm or 2.992"
    Piston clearence should be .0045"
    My current cylinder measures 2.9965"

    My question is:
    Is a stock piston exactly 76mm and the cylinder bore is cut additionally to account for the .004" clearance?

    Or is the bore 2.992" and the piston is slightly undersized the 76mm to account for the clearance?

    Hope what I'm asking makes sense.
    Thank you for any help

  2. #2
    PWCToday.com Is My Home Away From Home mcn6's Avatar
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    Re: Piston bore clearance 650sx

    Cylinder bore is typically 76, 76.5, 77, etc. Piston is typically undersized for the clearance. Keep in mind that piston sizes vary a little so bore sizes vary a little to match them.



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  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Piston bore clearance 650sx

    If you're trying to put it back together to ride out the season, I wouldn't be scared to hone it a hair and put some good used std bore pistons in there and run it. If you're buying a new top end kit then it only makes sense to buy .25mm over and get the cylinders bored to match.
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