vavles or ???

[Broken kfx]

I have been riding my kfx for about 2 years, After about 8 hours the exhaust valves become to tight have replaced springs cams still have the problem. Any sugestions??

[Defiant1585]

im having the same problem i am putting the kibblewhite (? spelling) valves in it there suposed to be stronger i was told that would take care of my problems

[Broken kfx]

I was told the same thing and it did not work. I would look into it befor sending the money.

[cdale2002]

I don't know if this is true but have have heard that after a while the Z/KFX/DVX motors begin to pull the valves into the head causing a tight valve clearace. Did you replace the valves along with the other things you replaced because maybe the valve are shot.