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36MX4 Engine numbers

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  • 36MX4 Engine numbers

    Hi I have 2 engines with the following numbers I've had both rebored and balanced ready to rebuild.
    I think I bought the second one a few years ago online, the first was with the complete bike still have gearbox bought another restored engine and gearbox for bike to complete restoration from Gary Greeves 246
    GPB1 299
    GPB 2/3/486
    can anybody help
    Rgds
    Ray

  • #2
    Someone on here will give you the exact details of when it was made but from my limited knowledge

    GPB1 is a 36MX4 according to the 1968 spec sheet 70,

    I'm guessing GBP2/3/486 is a 360 too as GPC1 is the 24MX4

    Anyone else ?

    Gary Gwillam said if you get in touch with him he'll help
    Last edited by John macleod; 25/01/2021, 09:46 PM.

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    • #3
      GPB1 299 is the engine from 36MX4C 507

      I can't see GPB2/3/486 or anything like it in the records - possibly an export?
      Colin Sparrow

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      • #4
        The GPB/2 engine was the same as the GPB1 except it had a wide ratio SP1 gearbox

        Druid

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