125 2C conversion to 250 2C
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Thread: 125 2C conversion to 250 2C

  1. #1
    Junior Member Keemabuna's Avatar
    Tim Dearnley
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    Jun 2012

    125 2C conversion to 250 2C

    I am having a re-think on my current project -a 1974 125 2C with cast iron barrel - I have recently found that the crank is "past it's best" and understand that changing the top crank-case, barrels, rods, heads and carbs to a 250 is easy - however may I ask if anyone has done this and if the exhaust system for example would also need changing?

    As I already have a '75 125 2C the thought of adding a 250 is quite tempting and possibly defendable to my wife...

    I am hoping that existing drums will suffice and the chain gear could be retained.

    Any advise please?


  2. #2
    Member SPEIRMOOR's Avatar
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    Apr 2013
    New York USA
    I'd be interested to know if your exhausts do need changing. As a prospective 2C (with rusty pipes) owner the only thing I have found are racing expansion chambers or other rusty pipes on Ebay.

  3. #3
    Senior Member DenH's Avatar
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    Jul 2010
    the bore and stroke on the 250 is completely different to the 125,if you got a complete 250 i reckon you could make it fit,it would be a lovely conversion,anyone got one for sale ?


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