re boring
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Thread: re boring

  1. #1
    Junior Member
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    dave townend
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    re boring

    hi guys a little help a set of cast cylinders off a 250 can someone please give me the piston clearance as the cylinders are getting re bored

    thanks

  2. #2
    Senior Member
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    steve peace
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    Hi Dave
    Can you confirm that the bike you are referring too is I am guessing the Benelli 2C twin 1973 onwards

  3. #3
    Junior Member
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    dave townend
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    yes the old cast cylinders

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  5. #4
    Senior Member
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    steve peace
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    Hi Have downloaded the manual I believe it is in the download section make sure it references the early cast iron cylinder block not the later alloy block let us know how you get on

  6. #5
    Junior Member
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    dave townend
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    hi can you give us a clue where it is please i have looked and cant find it

  7. #6
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    Mark Hollingsworth
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    I’ll look in my manual and see if I can find it also.

    Somehow I was thinking some of those had chrome plated cylinders? Perhaps I’m mixing it up with something else.

    Mark
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

  8. #7
    Junior Member
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    dave townend
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    thanks for your help i am struggling to find this info

  9. #8
    Senior Member
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    Mark Hollingsworth
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    the info is in this chart- but the don't just give a clearance- that would be too easy.
    But if you see the cylinder size and Piston size, is should give a clearance range.
    sorry for splitting these, it was too large to upload as one.

    wsm125_250_2c-piston_1.pdf
    wsm125_250_2c-piston_2.pdf
    wsm125_250_2c-piston_3.pdf
    1978 Benelli sei, 1973 Benelli 250 SuperSport, 1968 Benelli Dynamo Trail, various OSSAs, Betas

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