Carby NT Carb Tuning Basics

Discussion in '2-Stroke Engines' started by AussieSteve, Dec 27, 2009.

  1. crassius

    crassius Well-Known Member

    if you have acorn nuts on those studs, be sure they're not binding at the top - either break the tops off, replace with regular nuts, or add enough washers to give them more room inside

  2. mrbg

    mrbg Member

    Ya i got rid of the acorns
  3. mrbg

    mrbg Member

    I was riding home last night and my bike started actin funny, it would die when I stopped it would start with full choke and run while I fiddled with the choke between open and closed. I made it home, luckily I was only 2 mi.out. today I cleaned up the motor and started process of elimination fuel line, filter, sparkplug dry n tan. I pulled the carb slide out and the mainjet had rattled out so I pulled the carb cleaned the jet put loktite on,figured while it's open I'll check float height it was at 5/8" or16mm i set it 21mm,i took it for a ride it runs good @WOT,but it has flat spot in the middle, needle is set on topnotch. Anyone have a suggestion?
  4. butre

    butre Well-Known Member

    sounds lean
    mrbg likes this.
  5. mrbg

    mrbg Member

    Ya I was gonna raise the needle a notch and see that helps or raising the float a hair
  6. rcastro3185

    rcastro3185 New Member

    So do i need a new main jet?

    My bike starts to choke out? Bog down? After 75% trottle. Does that mean its to rich or lean? What size main jet would i need? Please help thanl you.
  7. crassius

    crassius Well-Known Member

    could be too rich, but 2-strokes will do this of revs aren't high enough to take extra throttle opening - if you are slowly building up speed & this happens, I'd try lowering float level to see what happens & if it helps, I'd try a smaller jet
  8. willwills90

    willwills90 New Member

    hey guys, what is the advatage of these 35 euro high performance racing carbs anyway?
  9. crassius

    crassius Well-Known Member

    they allow more air to flow when you have made performance mods to the motor