Russellg Posted August 30, 2023 Report Share Posted August 30, 2023 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? Quote Link to comment Share on other sites More sharing options...
lemur Posted August 30, 2023 Report Share Posted August 30, 2023 Make sure that noise is not just your fan. The bearings behind the magneto are your crankshaft bearings, it won't be that or she wouldn't run. If it runs good, keep searching for something simple. Quote Link to comment Share on other sites More sharing options...
Russellg Posted August 30, 2023 Author Report Share Posted August 30, 2023 The noise is worse under acceleration. Would that still be the fan? Quote Link to comment Share on other sites More sharing options...
lemur Posted August 30, 2023 Report Share Posted August 30, 2023 The fan speeds up when the engine does, just give the fan blades a spin with your finger and if it doesn't make the noise that's not it. Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 30, 2023 Report Share Posted August 30, 2023 Its just the plastic cover rubbing on the flywheel. Take it off and re-center. Nothing is really wrong. Quote Link to comment Share on other sites More sharing options...
Russellg Posted August 31, 2023 Author Report Share Posted August 31, 2023 Noise is still there with the plastic cover off. Ill check the fan tomorrow Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 31, 2023 Report Share Posted August 31, 2023 Grab the flywheel and check for movement. It could need main bearings. Quote Link to comment Share on other sites More sharing options...
Russellg Posted August 31, 2023 Author Report Share Posted August 31, 2023 There is slight movement in the flywheel. Quote Link to comment Share on other sites More sharing options...
Russellg Posted September 2, 2023 Author Report Share Posted September 2, 2023 Definitely not the fan. Must be engine or gearbox Quote Link to comment Share on other sites More sharing options...
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