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02 KDX 200 low end feels fine and upper end is responsive but in the midrange RPMs the bike runs rough.

Is this a jetting issue?

Could be a stuck KIPS.

Indawoods wrote:Could be a stuck KIPS.

How do I diagnose that?

Take the round screw cover with a slot in it that is up and to the left from the cover that says "KIPS" .... rev it to 6K and see if the shaft turns is the easiest way.

Indawoods wrote:Take the round screw cover with a slot in it that is up and to the left from the cover that says "KIPS" .... rev it to 6K and see if the shaft turns is the easiest way.

I removed the cover and can see no shaft. There is a hole or a port but I cant see a shaft inside. when I start it smoke comes out the hole until I rev the engine then the smoke stops coming out? It seems a valve is closing at higher revs. There is a lot of oil residue built up. Would that indicate it is running rich?

You removed the round screw cover with the slot in it? You should see a cam gear attached to a shaft in there...

Indawoods wrote:You removed the round screw cover with the slot in it? You should see a cam gear attached to a shaft in there...

Sorry I apparently did not read your post correctly (kids were screaming, Thats my excuse)

I removed the cover labeled KIPS. I will try again...

I followed your directions this time. I did see the cam gear attached to the shaft it rotated as I revved the engine. I assume that indicates that the KIPS valve is not stuck?

Right! It means it is advancing with rev.... that is a good thing!

Where are you located, your elevation, your current jetting?

Read the Jetting Guide here... http://kdxrider.net/forums/viewtopic.php?t=1156

Indawoods wrote:Right! It means it is advancing with rev.... that is a good thing!

Where are you located, your elevation, your current jetting?
Read the Jetting Guide here... http://kdxrider.net/forums/viewtopic.php?t=1156

I am in OKC, OK around 1200' Elev.

I do not know the current jetting. I think stock but that is purely assumption. I am the second owner and everything else is bone stock.

If the pipe is stock... it will hold you back. Stock jetting is really fat and will make your bike act worse the colder it gets. Air screw adjustment should help some however.

pipe is first on the list of things to do. Can/should I run the stock silencer with a gnarly woods pipe?

You can.... The only thing a aftermarket S/A will add it bling.

Thanks for all of your help.

Re: '..runs rough..'

Do you know what a 2-stroke sounds/feels like when it's 4-stroking?

I would go with the simplest thing, the needle. Especially if the bike started running rough in the mid-range since its gotten colder.

There isn't anything wrong with 4-stroking..as long as it's a no-load, light throttle situation. If my bike doesn't do it...I know it's too lean.

If it's happening under load AND throttle...that's a too-rich situation with a plug that's not firing every power stroke.