Crazymac680 Posted November 5, 2019 Report Share Posted November 5, 2019 I've just done a full rebuild and about 8 hours riding. I'm pretty sure it's been making the sound since the rebuild. When the clutch lever is pulled the engine sounds normal. As I release and the bike starts to pull I hear a whirring. It sounds a bit like an electric motor. Which increases in pitch according to the revs. I'm using putoline gear oil. Or could it be the clutch release bearing? Oil type? Thanks for any advice Quote Link to comment Share on other sites More sharing options...
markparrish Posted November 5, 2019 Report Share Posted November 5, 2019 My 270 used to make a whirring noise too - I think it's normal and my clutch was all fine. Mine only did it when you selected a gear - quiet in neutral. It became a bit quieter as things warmed up. A few other Rev3s in the club did a similar thing. If that's the case with yours, and it's all working nicely, I think you'll be good to carry on. 1 1 Quote Link to comment Share on other sites More sharing options...
faussy Posted November 5, 2019 Report Share Posted November 5, 2019 My mate used to joke that thats how you could tell you had a good one. Reasonably common back in the day when new Quote Link to comment Share on other sites More sharing options...
Crazymac680 Posted November 5, 2019 Author Report Share Posted November 5, 2019 1 minute ago, faussy said: My mate used to joke that thats how you could tell you had a good one. Reasonably common back in the day when new Haha thanks. I'll save this post Incase I sell it. 1 Quote Link to comment Share on other sites More sharing options...
Bilko Posted November 5, 2019 Report Share Posted November 5, 2019 That's not normal iv'e had 5 rev 3's never heard the noise you are describing,.and rebuilt 2 to replace main bearings. Quote Link to comment Share on other sites More sharing options...
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