No 2nd gear, eng sprckt wobbles

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stangish

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Hey people. Just got hold of a 125cc, lifan xb33 with a 14 bum and 19 front, Mikuni 22 3f carb, 1/4 turn throttle and I dont think the rear shock or front forks are standard. Gearbox is 1-0-2-3-4. I have 2 questions. It doesnt connect in 2nd, the sprocket just wobbles which causes the chain to just rattle, faster if more revs.It will go through to 3rd and 4th. Occassionally does this halfway through 3rd but not often. What is most likely broken? I'm about to start undoing stuff, what should I be looking for? Im new at this site but i have read a bunch of stuff that thump 140 has put up. Also, i was thinking about a race cdi and a flatside oko 26. what jets will i need ive tried to look at threads, 96-38 is what i read sorta, anyone know more than me, which is not much. Any information would be useful. And would a 16-17 fit on the back??
 
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