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    Default 68 BSA carbs question

    The "New guy. 68 BSA" thread got me wondering if maybe I could find the definitive answer here.

    I too have a 68 BSA, a Spitfire, all stock... All the "experts" so far have said the monoblocs on it aren't original. The guy who sold it to me isn't into bikes but said his dad bought it new and didn't remember him ever changing the carbs

    Edit: http://classicenglishbikes.com/tech_file/bsa.html#1968

    I tried searching previous ownership in the past with no luck! My title lists the bike as a 1968 A65SA1775_,(purposely left out the last number) but the above chart says a 1967 Spitfire should be a A65SA, the 1968 Spitfire A65SB?

    Maybe that's why the monoblocs are on it, because it's really a 67?

    But my BSA is badged a MKIV and has all the 68 signs like brakes, covers, etc and the title matches the stamped VIN

    My only guess is the bike shipped with GP carbs but were changed out early on??

    https://usedmotorcyclesforsalelist.c...ed-craigslist/

    Evidence of another 1968 A65SA
    Mine looks exactly like this one except for the carbs and the bars. Lower bars on mine
    Last edited by oneuptom; 10-12-2021 at 7:25 PM.

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    Default

    this also lists the SA as '67:
    http://www.motobrit.com/motc2/mpages.../bsanumber.php

    look at part numbers and references in the '67 factory parts book:

    1967 BSA 500 Twin & 650 Twin

    A50 - ROYAL STAR
    A50 - WASP
    A65 - LIGHTNING
    A65 - HORNET
    A65 - SPITFIRE MK II SPECIAL
    A65 - THUNDERBOLT

    https://partsbooks.britishonly.com/p.../20-10306C.pdf

    from here:
    https://partsbooks.britishonly.com/#BSA650Twin
    Last edited by TriNortchopz; 10-12-2021 at 11:44 PM. Reason: parts book

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    Default

    Quote Originally Posted by TriNortchopz View Post
    this also lists the SA as '67:
    http://www.motobrit.com/motc2/mpages.../bsanumber.php

    look at part numbers and references in the '67 factory parts book:

    1967 BSA 500 Twin & 650 Twin

    A50 - ROYAL STAR
    A50 - WASP
    A65 - LIGHTNING
    A65 - HORNET
    A65 - SPITFIRE MK II SPECIAL
    A65 - THUNDERBOLT

    https://partsbooks.britishonly.com/p.../20-10306C.pdf

    from here:
    https://partsbooks.britishonly.com/#BSA650Twin
    Thanks bud!

    I'd be curious to know how high the Spitfire numbers went after this one. If it was one of the very very last ones is it possible they just threw parts at it? Dumb Yank will buy it anyway Regardless I'm not disappointing because a matched set of monoblocs has more value to me if I ever want to convert a 59 TR6 to dual carbs. I would imagine they're not super easy to find anymore

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