//ArrowChat Code

Upcoming Events for the Next 120 Day(s)

Results 1 to 5 of 5

Thread: atc90 stroker carby help

  1. #1
    Join Date
    Apr 2011
    Location
    Australia
    --
    120

    atc90 stroker carby help

    hi, finally got my atc90 motor back from a fresh build. Its running a Helm&Son stroker crank with 54mm piston which should be around 133cc? anyhow im trying to figure out what size carb i should run? i have a 26mm mukuni and a 21mm keihin copy any of those work well? i was going to run the 26mm but it wont fit my sudco manifold, the bolt holes on the mikuni are slightly offset. Can anyone here give me some advice? cheers

  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    5,756
    26mm is a little to big IMO , it will work but throttle response will be boggy , 21mm might be fine but Iím not a fan of China carburetors .
    A genuine VM22mm or VM24mm mikuni round slide is you best bet or a old school 24mm Keihin if you can find one .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  3. #3
    Join Date
    Apr 2011
    Location
    Australia
    --
    120
    Ok ill start looking. Any idea what manifold fits these larger carbs properly?

  4. #4
    Join Date
    Nov 2015
    Location
    Davenport iowa
    --
    487
    Quote Originally Posted by vroomy View Post
    Ok ill start looking. Any idea what manifold fits these larger carbs properly?
    I believe the bolt width on a 26 is a bit wider than a 22 but I could be wrong. I've never had an issue with my 22's on any of the four aftermarket intakes I have.
    And make sure you are getting a genuine mikuni, there are plenty of copies ones on the market.
    90 nickolson Bored and Stroked "The Good"

    Big Bore 110 Pauter frame "The Bad"

    90 Bored and Stroked ?? "The Ugly"

    90 Nickolson Bored and Stroked "Waterloo"
    flat track build.

    1974 original 90 X 2

    1974 Original 70.

  5. #5
    Join Date
    May 2013
    Location
    Brownsville, Tn.
    --
    1,102
    I agree with Mike. A 26mm is almost too big for even a 180 motor. The VM22 would make your 90 scream. Will be a lot more responsive than anything larger.
    At 133cc and 54mm Bore you should have a 58mm Stroke. Good running little set up.
    * 1978 ATC 90/180 Pauter PJ1 / Springer "Team BAPP" Bike *

    * 1980 ATC 110/180 "Danny's Machine Works" 3D Sprint Dune Bike *

    * Nicholson 500 Race Bike *

    * HPATC Yamaha RD350 "Big Moe" Trike *

//ArrowChat Integreation Code //