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Flat Power And Sputtering

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I have a 2003 KDX 220r that has a sputter at 1/4 throttle and above...power really flattens out. Twist to full throttle and there is nothing left.

 

Jets are 42 and 145, clip is on the middle position. Carb is clean.

 

Gnarly Desert pipe and Turbine Core silencer, both brand new.

 

Tried raising and lowering the clip and was successful in finding the lean bog...didn't help the sputter.

 

KIPS seems to be operational (visual inspection with little cover removed and I see the rotation of the shaft).

 

Funny thing is that when not under load, I can twist the throttle and and it wants to rev to the moon.

 

 

 

 

 

 

 

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cdi , coil ,  spark plug cap might be damaged

what have you got the air screw set at ?

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Think I fixted it. I read a jetting guide and determined the symptom indicated a rich condition. Jetted down to 140 and moved the needle clip down one notch.

New problem encountered --- trying to keep front wheel down at full throttle.

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