Ball Joints are sold seperatly for around 30. Not sure why you would need to replace the whole knuckle?

I agree with your last post, I would check to see if the the stator is making contact with the magnets, I have seen this happen many times.

I live in north west Fl, and have been tuning 2 strokes for over 25 years. If im close enough to help you Email me your Phone number and I will give you a shout. Mike T

EBAY Will probably be your best choice for price and finding the right set up.

The Stators are notorisly bad on the chinnese bikes, They can be hard to find but are cheap, Which is part of the problem.

#1 Reduce deflection to 1/2in, #2 Stronger/Stiffer spring on the secondary clutch. It will stop the clutches from slipping so much on take off and under heavy load.