I have an 09 kx65 that started to pop once in awhile on top end. Then would do it by time son got to end of street. Replaced the piece on the stator (cheaper than whole stator) with part from Ricky stator. Ran great for two tanks of gas.....now starting to pop again on top end. I am no good at rebuilding a whole motor but replacing, soldering, ect. parts is no problem. I did notice some milkeness in the crank case so that is ordered. Would that cause this? The bike is in nice shape and well maintained.....I use auto tranny fluid in crank case changed every four or five rides, was using quicksilver but just switched to castor 927 and run 93 octane. Any help would be great.....just ordered bunch of stuff for Xmas for it or would consider going back to klx110. Son LOVES this bike but sits more than he rides it. Thanks in advance from a frustrated father.