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Thread: Head gasket for 90MM piston

  1. #1

    Head gasket for 90MM piston

    Will the stock head gasket be OK to use when I bore the cylinder to fit my 90MM piston? Or do I need one with a bigger bore also? If so, who makes one?

  2. #2
    They are available in a number of places...try here as a start.

    http://www.cometic.com/i-24848137-ya...asket-kit.html

    Also Kedo etc.

    SR
    ...'Any unnecessary items on the bike, that it doesn't really need, shouldn't be there!'. (Café racers creed). SR..

  3. #3
    Senior Member
    Join Date
    Dec 2015
    Location
    Germany, Stuttgart, where the car was born
    Posts
    120
    Hi,
    the combustion chamber should be modified too with a nip on edge fitting to 90mm to reduce the possibility of pinging.
    Such as in the pic.
    Regards
    Rei97
    Click image for larger version. 

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  4. #4
    Thanks for the referral, just ordered the top end set from Cometic.

  5. #5
    Thanks for the tip, I'll have my machinist do the modification.

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