Ok, I got the old kdx 200 out for the summer. I flushed out the carb and now I have a bog from low to mid range. A few years ago I would have remembered how to get it out of there, but now sadly I don't remember. Can anyone give some advice to this??

 

What does it have for a carb? Mukini, has 5 circuts, bottom end pilot jet/ air screw.

First check and make sure the float level is properly set, can't do a thing until it is.

Does it bog if you nail it? it may not be getting enough fuel through the pilot.

Turning the air screw in will richen it, turning it out leans it, more than 4-5 truns out, and you should change the jet.

as a general rule, if you experiance problems when asking for instant power.... its rich, this is easy to tell, if the problem is more severe when at operating temp, and it runs better when cold.

If you are having "roll on power" problems and it is breaking up with steady roll on of the throttle....lean.

next jet needle, needle jet. they control 1/3 to 2/3 throttle.

Cutaway on the slide also has an effect, however unless you've modifided it it should be ok.

try those let me know how you make out.

 

thanks for the reply, it has a Kehein. It bogs when you want the instant power. Whak kind of float level should I use??

 

I would check the jetting and make shure everything is clean. Just keep your eye on the color change of the plug. 2 strokes are known for fouling plugs. Did you change that too?

 

The thing with Kehin carbs is the air screw isn't......it is a fuel screw and works similar, instead of air it controls fuel, and turning it out adds fuel, turning it in leans it.

Is it a slide carb or butterfly type?

You'll have to set the float according to the manual. Rule of thumb, when the plate that holds the float is level when holding the carb upside down. and the needle is seated.
However there are some carbs that make the adjustment by bending a part of the plate that is tounged out.

Kehiens also use (some of them ) fixed needle jets.

 

well, that is how I finally decided on the floats (similer in most auto carbs) and the fuel screw is about 1/6-1/4 turn out. And the needle (slide carb) is in the center setting but I think I will rise it one setting. It is my brothers bike and I am trying to get it ready to sell for him. I never really rode the bike before, mabey I am asking too much out of 200cc. My bike was a big bore, so I don't really know how a small bike runs. Thanks for the info guys.

ps...Kiehin?? I think it might be the spelling.

 

Doesn't matter how you spell it, they suck either way!!!Raising the E clip on the needle will lean it out some in the midrange. I would first turn the fuel screw in to the seat, then back it out 2 to 3 turns, and see how it runs. See if you can get a crisp throttle from off idle before making changes to other areas. Its hard to tune a carb via the internet.