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    seattle##gs

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    1) what is the thread pitch of the timing plug hole at the base of the cylinders 1968 and earlier T 120? It is a BSF something.

    2) OIF frames...is there a vent tube anywhere? I know the engine vents through the primary.
     
    seattle##gs said:
    1) what is the thread pitch of the timing plug hole at the base of the cylinders 1968 and earlier T 120? It is a BSF something.
    Click to expand...

    According to my '68 parts book, it is part E4706 which appears to be 1/2 x 16 BSF.



    seattle##gs said:
    OIF frames...is there a vent tube anywhere?
    Click to expand...

    Yes, there should be a vent tube between the plates at the rear of the headstock.
    2 questions

    (There are variations in breather pipework according to model year).
     


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