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Crich Tramway Museum Classic Bik...
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Exhaust port Thread Size

Home Forums TR3OC Members Forum Exhaust port Thread Size

This topic contains 2 replies, has 2 voices, and was last updated by  Robert Alderton 11 months, 2 weeks ago.

  • Author
  • #5869

    Robert Alderton

    has anyone had to helical or recoil their exhaust port threads.

    It seems to be 1 and 1/2 inch thread diameter and 16 TPI

    what thread would this be, as its not UNF.

    for a 1975 T150v

    and any luck getting anyone to do a decent job on it.

    many Thanks

  • #5875

    Dick Herzberg

    Hi Robert, Richard at P&M have oversize exhaust stubs which aren’t just bits of pipe threaded but heavier, they will tap and fit these for you, my advise is to do all three to be on the safe side whilst the head is off. I do my own for engines which I prepare. Cheers, Dick

    • #5885

      Robert Alderton

      Thanks Dick

      Will do, most of my motor is from P and M, the lightened crank, carillon rods, forged pistons, belt drive and clutch, carbies and valves etc and most other parts in the head.

      So may as well send this head back to them to get done.

      Regards Robert

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