# wheeler will only run a full choke!!

[RIDE-RED 250r]

If that carb is like the OEM 200es carb, the idle mixture screw will be on the bottom of the carb housing between the slide and engine, facing downward. It's kind of tough to get to. But if thats what you have, it regulates fuel at idle, and therefore opening it will increase fuel, closing decreases fuel.

Most of the 4-strokes had fuel regulating idle mixture screws as opposed to 2-strokes which had air regulating idle mixture screws.. Easy way to tell: If the idle mix screw is between the throttle slide and engine, it regulates fuel. If between the slide and airbox, it regulates air. Not to be confused with idle speed screw.

[shdtreemechanic]

If that carb is like the OEM 200es carb, the idle mixture screw will be on the bottom of the carb housing between the slide and engine, facing downward. It's kind of tough to get to. But if thats what you have, it regulates fuel at idle, and therefore opening it will increase fuel, closing decreases fuel.

Most of the 4-strokes had fuel regulating idle mixture screws as opposed to 2-strokes which had air regulating idle mixture screws.. Easy way to tell: If the idle mix screw is between the throttle slide and engine, it regulates fuel. If between the slide and airbox, it regulates air. Not to be confused with idle speed screw.

Thanks man for the info yes the carb has that screw on the bottom on the motor side I never have seen one so I ran it in all the way I bet that is whats causing it to starve. Is there a baseline on how many turns this should be out? Thanks man for the info I will definitely adjust that, like I said I had never seen one on a carb like that but I never worked on atc's or quads either. Thanks, Jesse

[Jmoozy27]

No more than 3, no less than 1.5 is kind of my guide to the air fuel mixture on a four stroke. Lightly screw it in and back it out 2 turns and that should have you in the door.

[muthey]

manual calls for 1 7/8 turns out on the screw, also make sure when you put it back in that it went o-ring metal washer, and then spring or it will leak air from there. Definitely try that before we start talking another carb. I believe the oem carb is a kehien pd55a

[Cromagnaman]

I had the exact same issue once on a motor bike I once had. If I took it off choke it would stall out every time. Turned out the main jet was clogged at the end. All this after I had already cleaned the carb once. Might be your issue as well.

[shdtreemechanic]

The main jet may be clogged but the idle air mixture being screwed all the way in isnt going to help it run to good. When it warms up again im going to adjust the idle mixture screw and try that first. Thanks for all the help it is well appreciated

[RIDE-RED 250r]

I think you may be on the right track. Since you turned the idle mixture screw all the way in, that will most definitely starve it for fuel on the idle circuit!

As previously suggested, around 2 turns out from lightly seated should get you in the ballpark. Then you can fine tune from there. Make sure you make your final tune on a fully up to temp engine. An adjustment that will give you a satisfactory setting on a luke warm engine will change enough between that and full operating temp that you will want to adjust again.

Note: as you adjust the mixture screw, idle speed will also change. So keep in mind that as you adjust mixture, you will need to adjust the idle speed screw accordingly. (Idle speed screw is found on the slide housing)

Sorry for not getting back to you quicker... Was at work all night..

[shdtreemechanic]

Hey no problem im just glad everyone is commenting on my post and giving me all this great info. Thats what k going to do is adjust the idle mixture screw. Thanks for the replies they are all a big help.

[shdtreemechanic]

Ok update!! went out and wrenched on the 200s adjusted everything like you all said still nothing it will only run on full choke, it will throttle up but if you ride it it only takes half throttle before its starving for fuel, The carb on it is ajieli pz27 it has a main jet that is made to the emulsion tube the next jet beside it is a number 40 so I got the factory carb can I use the jets out of it in this carb? the main is a 100 and the ssmall jet is a 35 I cant use the whole carb because the slide is smaller and I don't have it. And will this fix it maybe? Thanks in advance love to hear from u. Jesse

[muthey]

You can try that but it might be easier to go on eBay and buy a new slide and spring and cap for the oem one instead, as those jets are the right sizes for that one. But try the oem jets in the carb you have the slide for and see where that gets you before buying anything. And I will see if I have a spare slide spring and cap floating around somewhere I know someone else will even if I don't.

[shdtreemechanic]

You can try that but it might be easier to go on eBay and buy a new slide and spring and cap for the oem one instead, as those jets are the right sizes for that one. But try the oem jets in the carb you have the slide for and see where that gets you before buying anything. And I will see if I have a spare slide spring and cap floating around somewhere I know someone else will even if I don't.

It actually helped changing the jets it does hesitate a bit when throttling up but smooths out and it will pickup and go. I think it needs some fine tuning still

[aramid]

It actually helped changing the jets it does hesitate a bit when throttling up but smooths out and it will pickup and go. I think it needs some fine tuning still

What is your air temp there when you first start the bike?

How much choke do you give it to start?

How much throttle?


Try to start it with no choke and no throttle, then try 1/4 throttle.

If it burbles/stutters when you accelerate, it is rich . . if it simply fails to accelerate like it is out of gas and then finally accelerates, it is lean.

There is a needle in the slide that is adjustable . . try it on the lowest position then on the highest position . . keep testing until you notice a difference and post which position is better.

Clean your spark plug with a wire brush and carb cleaner or install a new one . . you want to try and get the porcelain nose as white as possible . . remove it after riding for at least 30 minutes total with just cruising and also revving it out, thenpost a photo of the plug from around a 45 degree angle.

im guessing that since it runs better in the higher rpms, your main jet is too big causing it to be too rich and lowering the needle might help . . if the needle is as low as it can go with the clip in the highest position, and it runs worse if you raise the needle by lowering the clip, then you need maybe a 2 size smaller main jet.

[shdtreemechanic]

I think the needle is in the third slot the main jet is a 100 which is stock for that bike, im out of gas right now but I'll try to adjust the needle an see what happens. Thanks for the replies

[shdtreemechanic]

Also i start it on full choke give it just about a. 1/8 inch or less of throttle to start the air temp is around 40

[RIDE-RED 250r]

I can't speak to the carb you are using specifically, but at one time my atc110 had a chinese carb on it and it ran like garbage. OEM (Keihin) jets swapped right in and it ran OK after that