I am just rebuilding an engine for the YBR 125 right now , it had a rumble on the engine , i was not 100% certain what the problem was but now i am convinced its main bearing failure .
so quite an easy fix .
here is a video of the movement of the crank inside the bearing .
I use these bearings from here bearings here , i fitted FAG 6205C3 type bearings , FAG as they are excellent and used them a lot in my 2t bikes and C3 as these were recommended for 2t bikes when i used to work on them so should easily be ok for 4t .
I use these bearings from here bearings here , i fitted FAG 6205C3 type bearings , FAG as they are excellent and used them a lot in my 2t bikes and C3 as these were recommended for 2t bikes when i used to work on them so should easily be ok for 4t .
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