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Sooty plugs

Home Forums TR3OC Members Forum Sooty plugs

This topic contains 3 replies, has 3 voices, and was last updated by  derek aldred 2 months, 2 weeks ago.

  • Author
  • #7117
    Ian Bradshaw
    Ian Bradshaw

    My brain is starting to hurt. I have rebuilt my 1969 T150. When I took it up to 3 to 4000revs UNDER LOAD it started to misfire. When I took the plugs out they were all very sooty. The carbs are new with the correct jetting, air slides etc. as per the official workshop manual. The air filter and its housing are also standard. If the pilot air screws are not set correctly would it cause this condition. The plugs are really very sooty. It is a dry soot, not oily. I have TriSpark Classic ignition running with 1969 12volt coils. I cannot see the coils causing the problem as surely it would only show up on the faulty coil spark plug.

  • #7118
    David Lord
    David Lord

    Ian, the 1969 standard slide is a no. 3 cutaway?  If that is what you have fitted then it is much to rich for modern fuels.  I think you need a 3.5 or even a 4 for good results.

  • #7119
    Ian Bradshaw
    Ian Bradshaw

    Thanks David, I will look through my spares and see what I have. If memory serves me right I fitted 3.5 to my T150V and that runs perfectly. Is there an easy way to fit the short spring on the throttle rod? On my T150V I fitted lightweight springs and did away with the short throttle rod spring.

  • #8184

    derek aldred

    I have just read your answer on slides David, is that the same for 1970 rocket and 72 hurricane as I have same problem with both on short runs but not bad on long runs???? Thanks Derek

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