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Thread: Mix & match

  1. #1
    blegan's Avatar
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    Mix & match

    Anyone have an opinion on mixing & matching pistons & rings ? 94 750 fuji 2 O.E.M. pistons 1 WSM piston & 3 sets RKI aftermarket rings. Problematic or just run it ?


  2. #2
    ryandi2's Avatar
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    i think its fine to run miss matched pistons.. as long as they are all the same size.. and i would imagine the rings would be fine as long as the ring clearance was in spec.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Piston weight is the big issue. You don't want different weight pistons throwing off the crank balance.

    As long as the rings fit those pistons you'll be fine. Not all rings are interchangeable. Some are "L" shaped, others are keystones, etc....

    Make sure they fit before you go installing them and ruining a cyl or 2 as soon as you hit the start button.

    I believe the RKI rings are the ones that come with WSM pistons. If so, they are generally compatible with OEM pistons. But verify this first before you take my word for it.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by xlint89 View Post
    Piston weight is the big issue.

    You don't want different weight pistons throwing off the crank balance...
    Have you seen this thread

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by K447 View Post
    Have you seen this thread
    uh, no....

    That can't be good!!!!!!

    Sad thing is, he ALMOST sounds like he knows what he's talking about....

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by xlint89 View Post
    uh, no....

    That can't be good!!!!!!
    I think it falls into the category of...


    Ride more, worry less

  7. #7
    blegan's Avatar
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    Quote Originally Posted by xlint89 View Post
    Piston weight is the big issue. You don't want different weight pistons throwing off the crank balance.

    As long as the rings fit those pistons you'll be fine. Not all rings are interchangeable. Some are "L" shaped, others are keystones, etc....

    Make sure they fit before you go installing them and ruining a cyl or 2 as soon as you hit the start button.

    I believe the RKI rings are the ones that come with WSM pistons. If so, they are generally compatible with OEM pistons. But verify this first before you take my word for it.
    The RKI rings did come with the WSM piston, they are L shaped & the O.E.M. pistons have L shaped rings also in this case. I was very careful when assembeling cyl. onto piston got a nice fit & end ring gap was within tolerance.Thanks for the feedback, Someone had suggested that running the aftermarket rings & piston along with the O.E.M. was just asking for trouble, figured I would get someone elses
    opinion.
    Brian

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Actually, the Fuji piston rings are keystone shape. You need to make sure the bevel is facing up.

    If you install the ring up-side down, it will fit, but it won't spin in the ring groove freely. That's a warning that something is wrong. Should you run the engine like that, you may have ring, piston, and cyl damage.

    MAKE SURE your rings are seated properly!!!!!!!!!!!!

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    i tried to use a .25 mm over size on 1 of 3 pistons when i had my clys bored glad the machinist stoped me he threw it on the scale and it was 5 grams more than the lowest std piston

    might not seem like a lot but its a ride more not worry thing , there is 6k rpm of turning pistons under your junk you know

    buy a whole kit your pistons should be the same size , brand ,

  10. #10
    blegan's Avatar
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    Quote Originally Posted by Bone1050 View Post
    i tried to use a .25 mm over size on 1 of 3 pistons when i had my clys bored glad the machinist stoped me he threw it on the scale and it was 5 grams more than the lowest std piston

    might not seem like a lot but its a ride more not worry thing , there is 6k rpm of turning pistons under your junk you know

    buy a whole kit your pistons should be the same size , brand ,
    I am running all standard size bore pistons & cyls none of which have all that much of a weight difference.My main concern was the RKI rings being compatable with O.E.M. pistons.
    Thanks Brian

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