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  1. gtrack45

    Very short stroke 250cc single! Advise appreciated.

    I am currently building a 250cc 4 stroke single which employs an extreme b/s ration of 1.6...b=80, s=50. Does anyone know of any practical probs im going to have in reality? im especially concerned with the cam timings, i have used a 165mm long con rod, it is 4 valve and on Methanol although due...

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