Russellg

Definitely not the fan. Must be engine or gearbox

There is slight movement in the flywheel.

Noise is still there with the plastic cover off. Ill check the fan tomorrow

The noise is worse under acceleration. Would that still be the fan?

Just recently bought a 2008 beta rev 250, the kickstart jammed, seemed to have fixed that issue now a whirring noise coming from flywheel magneto? And suggestions what this could be? Are there bearings in the magneto?