94' kdx 200 strange powerband hit, help!!

[MeanGreen94]

This winter I purchased a 94 KDX 200, it has Fredette engine work which is only a port job I believe, FMF Fatty pipe, and a Powercore silencer. What I have noticed with this bike is an uncontrollable powerband hit. It seems like it's running good up til about half throttle and then without warning it hits. It is an abrupt hit. I would like to smooth this out if possible. This powerband makes it very difficult to wheelie over obsticles and climb hills. I have gone through a fender already and damaged my new one, and when im climbing a hill and it hits it just breaks my rear tire loose. I find myself very frustrated with this powerband and need a solution fast. Thanks in advance.

 

[seb33]

KDX 200 already have there powerband up high compare to a 220 I suspect that the porting job with the fatty pipe was done to make the bike even more like a MX (not much on the bottom but every thing up high) If this is the case you would need to undo the mod that was done to it!! :coocoo:

 

[2 strokes for life]

The flywheel might have been lightened alot. Take a peak and see if there are tool marks.

 

["REV"]

Jeff would never do that, It must have been done by the previous owner. IF that is the case.

 

[K D]

Do a little research here on carb needles, you may want to try a different one.

 

[nwjohn]

call james dean (jd jetting) and get a diffrent needle. i did this for my wifes 94 , his needle profiles seem to smooth the power band out and make it more linear through the power band.

 

[motodr9]

jetting

It sounds to me like the pilot is too rich, and the needle/main are too lean. When you get on the needle (1/2 throttle) and above it screams? Cleans out suddenly? :yikes:

 

[sixteendohc]

Try the FMF torque pipe and also the Fredette torque ring

 

[paab]

As always, inspect your reeds. ANy chipping or cracking at all, replace them.

 

[MeanGreen94]

Thanks guys!!!!!!!