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piston197

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  1. Bsa B40 Piston

    piston197 replied to bobtlr's topic in Pre-65 Bikes
    No,balance factor same for both pistons,if you need on phone me 01989 750731,John

  2. Bsa B40 Piston

    piston197 replied to bobtlr's topic in Pre-65 Bikes
    Basically there were 2 pistons used in the B40 standard ratio 7:1 and higher comp version 8.75:1,the higher one now seems to be favoured by the more experienced(and more aggressive riders),i still have about half a dozen of these all 1/2mm (+020) oversize,can deliver to the bonanza if anybody wants one,the low comp piston measures 1.608" from centre of pin to top,high comp piston measures 1.801" for identification. Pistons i have are all genuine BSA

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