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Thread: US90 Running issues.

  1. #1
    Join Date
    Feb 2017
    Location
    Minnesota
    --
    4

    Thumbs down US90 Running issues.

    Hi guys. I have a US90 I picked up a few months ago and it has had issues running since then. It will idle forever but whenever a load is put on it or the throttle is floored, it bogs down and dies. It has a brand new 16mm Keihin carburetor on it that I purchased to replace the old identical carb it had on it because some parts were bad inside. There are zero exhaust leaks and all of the intake gaskets are intact. It doesn't foul spark plugs. The needle in the throttle is set for the highest gas ratio (I've tried it at all levels and the most gas worked the best). Would timing be an issue with this? Please help!
    Last edited by Studhoss; 02-24-2017 at 12:07 AM.

  2. #2
    gimmeamidget is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jun 2014
    Location
    utah
    --
    434
    Have you adjusted the points?

  3. #3
    Join Date
    Feb 2017
    Location
    Minnesota
    --
    4
    Sorry I took forever to reply. I have no idea what the points are, is that on the stator?
    Last edited by Studhoss; 04-14-2017 at 10:25 PM.

  4. #4
    Join Date
    Feb 2017
    Location
    Minnesota
    --
    4
    I lied. I know what the points are, just how should i adjust them for a lean or rich ratio? I can get pictures for reference if needed.

  5. #5
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,001
    I agree with gimme, clean and adjust your points and go from there. Do you have a manual?
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

  6. #6
    Join Date
    Apr 2016
    Location
    CA
    --
    10
    Indeed, points.

  7. #7
    Join Date
    Feb 2017
    Location
    Minnesota
    --
    4
    I do have the manual. I'll have to go get it from my friends shop today, will it have the diagrams I need to adjust it properly? Thank you

  8. #8
    Join Date
    Jun 2010
    Location
    Cold Lake, Alberta, Canada
    --
    3,001
    Yes, it should be fairly straightforward.
    Trikes
    1970/71 US 90 (Aquarius Blue)
    1970/71 US 90 (Future Project)
    1972/73 US 90 Camo Project (110 Big Bore)
    1972/73 US 90 Green
    1977 ATC 90 w/83 110 motor (Fugly)
    1982 ATC 70
    1983 ATC 70 (Ladybug)
    1973 ATC 70

    1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain

    TF 2015

    Other
    1983 Honda Z50
    1978 Honda XL75

    Feedback http://www.3wheelerworld.com/showthr...ck-for-coopool
    http://www.3wheelerworld.com/showthr...k-for-coolpool

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