K fellas there s only 1 adjustment screw on the carb as seen in pic It was...

netboard

K fellas there's only 1 adjustment screw on the carb as seen in pic. It was only a 1/4 turn out. I have never seen a carb just with 1 adjustment screw. That one should be turned out to 1 1/2 right? My trx250r has 2 but this carb has me stumped

%d comments
  • To adjust idle lift seat and look for top of carb there should be an adjustment screw there for idle

  • under the seat is anothe

  • ? I just had the seat off and changed the filter I didn't see anything that looked like anything I could adjust

  • But if like me someone has removed the tors system and not put an idle screw in carb then maybe you could adjust throttle cable

  • I seen a screw at the top right of the carb

  • It might be it you get to it by removing seat

  • Tried the cable alread

  • its a nob type thing

  • Yes stock settings is 1 1/2 turns.

  • Idle adjusting.

    Set float level, make sure that all jets are clean and fuel flows freely from the float bowl drain when the screw is cracked open.

    Start with air screw 1.5 turns out.

    Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body. Warm up motor and then set idle screw for a faster idle, 2000rpm+ Adjust air screw either way to get the fastest idle. Adjust air screw a little at a time leaving 10 secs or until the motor responds. Re adjust idle screw for desired idle .

  • My air mixture screw is 3/4 turn out. I have a full Toomey B1 exhaust with a 310 main jet, no airbox lid and needle jet set at 3rd position

  • I honestly do not know where my air screw is, after the initial setting of 1 1/2 turns and warming up the engine, I turned the air screw (as one should do ) either way to get the fastest idle possible.

    Who knows how many turns the air screw is out.

    If it seems like it is less than 1/2 a turn out or more than 2 1/2 turns, I investigate why...

  • Ok how the hell do you know how many turns its been turned and which way

  • Mine seems to need to be adjusted revs too high when warm

  • Idle adjusting.

    Set float level, make sure that all jets are clean and fuel flows freely from the float bowl drain when the screw is cracked open.

    Start with air screw 1.5 turns out.

    Set idle screw so that it has some sort of idle. With TORS it is the big screw under seat on top of unit. With no TORS is is the brass screw midway down carb body. Warm up motor and then set idle screw for a faster idle, 2000rpm+ Adjust air screw either way to get the fastest idle. Adjust air screw a little at a time leaving 10 secs or until the motor responds. Re adjust idle screw for desired idle .

  • Ok I know but how do i know how many turns its been turned

  • Turn it in and count how many turn u turn it in

  • Is in left or right

  • Turn it right till it stops then back it out left