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Thread: ada 42 cc heads

  1. #1

    ada 42 cc heads

    Just got ada 42cc heads. Does anyone know if I have to richen the stock carbs or just run 91+ octane to run these or both.
    This is for a 2000 ultra 150.


  2. #2
    lxman88's Avatar
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    what static compression are you getting ? ada says 92 octane or better... and you should not have to adjust you carb most the time only time you should have to do that is when you adding more air to the engine like intake exhaust etc... but just run the ski and do a few plug chops to check the burn if you worried about it know what a pain a ultra cab be to get to the carbs just open the high a tinny bit like 1/16 turn that should be good if they are already set proper

  3. #3
    Quote Originally Posted by lxman88 View Post
    what static compression are you getting ? ada says 92 octane or better... and you should not have to adjust you carb most the time only time you should have to do that is when you adding more air to the engine like intake exhaust etc... but just run the ski and do a few plug chops to check the burn if you worried about it know what a pain a ultra cab be to get to the carbs just open the high a tinny bit like 1/16 turn that should be good if they are already set proper
    Thanks that is really helpful. I a, going to check the plugs and see where we stand. Thanks again

  4. #4
    Self Confessed Day Dreamer toomanytoys's Avatar
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    Plug chops aren't the best way to make sure any more. The safest way is to get a digital tacho and watch for an RPM drop at full throttle. Watch for a drop that doesn't go back up. Once it drops say 30RPM you need to stop as that's a good indicator to running to lean. 50RPM drop is on it's way to doing damage.

    You can't do much with the stock carbs, so be careful.

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