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Thread: Off idle bog.

  1. #1
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    1,144

    Off idle bog.

    All right guys need a starting point here and I know this has been discussed before but searching old threads is a pain imo.
    What we have is a bored and stroked 90, running a mikuni VM 22 carb with a full race cam.
    The trike has a serious bog off idle when cracking the throttle wide open. Tried slide cutaway, Needle those don't help so I'm down to jets I believe. It's running a 100 main and 30 pilot. Any suggestions here? 1/4 - top end is perfect just can't get the snap at low end throttle opening.
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

  2. #2
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    How many turns out is the fuel screw at?
    It sucks to get old

  3. #3
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    1,144
    Runs best at 3 out Nicko

    Out of curiosity I just tried a 20mm mikuni. Now I have good off idle throttle, no stumble but no fuel on 3/4 throttle on up went from a 90 main up to a 160, no difference. I suspect some of that might be bowl fuel level set to low
    Last edited by DAM shop; 07-14-2019 at 03:16 PM.
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked “vey’s frame” "The Ugly"

    110 JSC frame Bored and Stroked
    flat track build. “Shop trike”

    1974 original 90 X 2

    1974 Original 70.

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