Does anyone know of an O.E. (any brand UJM)66-67mm piston for my CB350 ?
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Does anyone know of an O.E. (any brand UJM)66-67mm piston for my CB350 ?

This is a discussion on Does anyone know of an O.E. (any brand UJM)66-67mm piston for my CB350 ? within the Technical forums, part of the Caferacer.net Forums category; I have a CB350 twin which I want to install a pair of good 66-67mm O.E. type cast pistons that'll give me a 10.5:1 compression ...

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  1. #1
    Junior Member grcamna4's Avatar
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    Does anyone know of an O.E. (any brand UJM)66-67mm piston for my CB350 ?

    I have a CB350 twin which I want to install a pair of good 66-67mm O.E. type cast pistons that'll give me a 10.5:1 compression ratio. Have any of you found anything that'll work as a direct swap after boring it out ? I was told a KZ750 piston may work... ?
    Thanks for any ideas.

  2. #2
    Senior Member crazypj's Avatar
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    XR200, 350 block needs modifying
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  3. #3
    Junior Member grcamna4's Avatar
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    Hi PJ,
    The CB350 twin crancases need modifying ? or the cylinder block ? Is it possible to use the stock CB350 cylinder liners w/ XR200 pistons ?Then directly bore out & ride ?

    Thanks again pj,
    B.
    Last edited by grcamna4; 11-29-2013 at 06:58 AM.

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  5. #4
    Junior Member grcamna4's Avatar
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    bumppp

  6. #5
    Senior Member mlinder's Avatar
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    You have to cut (mill) the shoulder down on the xr200 pistons.
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  7. #6
    Junior Member grcamna4's Avatar
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    mlinder,
    The shoulder of the XR200 piston that you're referring to,is it the area directly underneath the piston pin(the side skirt of the piston)that needs some piston material removed ? lets say so that the piston can continue all the way down to BDC and clear the crank wheels ??
    have you done this mod yourself ?,
    Thanks,
    grcamna4

  8. #7
    Senior Member mlinder's Avatar
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    No, the shoulder. The top edge of the pistons.
    http://quiterandom.hubpages.com/hub/...sic-motorcycle How to buy a used bike
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    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

  9. #8
    Senior Member Teazer's Avatar
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    How low is the compression compared to say a Wiseco 67mm piston or a stock 64mm?

  10. #9
    Senior Member drgonzo's Avatar
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    I put one together with GPZ750 pistons. Ran good.

  11. #10
    Junior Member grcamna4's Avatar
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    drgonzo,
    Can you tell me how many different mod. procedures you had to accomplish to get her on the road ? Was it a street cafe bike w/ low enough compression to run regular ? What compression ratio do you think it had ? Love to hear more...

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