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Hi, I have a 110cc semi-autoengine with 4 gears.
I just recently replaced the 4th gear because of broken teeth, and it worked just fine. Now I am having a problem with third gear, when I shift into third and accelerate, it starts to go and then the bike hesitates and it then it catches and accelerates again and then it hesitates, then catch and so on. I took the engine apart and looked at the gears but could not find anything wrong, I replaced third gear anyway. I also opened the other side of the crankcase and checked the shifting levers and everything appeared to be good, no noticeable wear. When I put the engine back together it worked good for a few minutes and then third started doing the same thing again. I thought maybe it was a clutch problem, but I am not sure because it works fine in 1st, 2nd & 4th. Any ideas:confused:

Also I am not sure what I did except I had to readjust the timing when I put the engine back together, but now the engine will rev to 12,600 rpm's! Is this normal? Before it may have made it to 7,000.
 
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