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[QUOTE="calistang1966, post: 1270610, member: 86317"]
my brother has a 2002 yz125 that has been having some problems lately.   the engine went down once because a circlip came loose and ruined the cylinder and piston.  we had the cylinder replated and put a new piston in.  we put it all back together and it ran fine for 5 rides except for a knocking noise in the engine at low rmps but would leave at high rpms. after 5 rides the bike just died again and so we tore it apart and the ring was stuck.  so after replacing everything we got it running again for about 10 min and it went down again!!! the knocking was still there and we cant figure out why and now it wont start.

we tore it all down again and there was nothing wrong.  so we took it to a shop and showed the guys and they thought it could be the lower rod or bearing was out but after checking that with them it was fine.  we also checked the bearings behind the side case and they were fine.  the guys at the shop were dumbfounded and could not figure out what the problem is.

is there anyone that has had a problem like this or has any suggestions on what is wrong? what could be causing the knocking sound? why cant we get it started?

PLEASE HELP ANYTHING WILL HELP.  thanks
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