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Yz125 topend issues?

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Alright guys, posted here about month back with bike problems on a 99'yz125. Ya"ll sugg. top end so i did that and the bike ran awesome! Did the break in as manual said and everything great. Two rides later i was realy hard on the throttle in 6th gear and it made some rattling noise and bogged out. It kick over but made a weird rattle noise? Then i tried to kick it ove once more and BAM! locked up. So itried to kick it again and it will turn over but i have to kick hard(really). This was replaced by Wiseco piston correctly. One of my friends suggested a cracked reed? Because off the sudden increase in compression. I hane no clue, any help guys??:censored::ride:

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You probably didn't turn the piston circlips to the 'closed position'. They probably snapped and got between your cylinder and piston and gouged your cylinder apart. Congrats, take your engine apart and show us. I love carnage when it's not my bike.

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