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Just put the bike back together, ended up getting some parts from OORacing as the local retailers wouldn't respond. Replaced the crankshaft as the con rod bearing was shot, and put a new oil pump in also. The con rod appeared to be contacting the crankshaft web, which I assume was the cause of...

Thanks mate, I've only just put the motor back together after replacing the gearbox; the flywheel nut should be tight (went on with a rattle gun). The piston doesn't show any impact from valves, only slight scoring down the sides; the valves look to be good too. Any tips on checking the...

There does seem to be some slack, but from the splines; the driven gear feels quite solid. I have run the motor without the clutch, so this gear should be stationary, and the noise persists.

Hi All, New MadAss 125 owner here, recently picked up a 125 with a 140 upgrade; looks to have OORacing parts, new cylinder, head, carb, CDI etc. I've wanted one since they came out, and this popped up but needed some work. Owner said there was a grinding noise when running, and we...