dean3755 Posted January 20, 2014 Share Posted January 20, 2014 I need to replace the main bearings and have been told that I need to fit C3 clearance bearings. But the bearings in it are not marked C3. Does anybody know if the bearings need to be C3 rated? I,ve had the engine for years and expect that these bearings are the originals. Link to comment Share on other sites More sharing options...
Moderator DirtyDT Posted January 20, 2014 Moderator Share Posted January 20, 2014 C3 allow a bigger tolerance for expansion when the bearings get hot. The last thing you want is for the bearing to spin in the case. You may want to say hello in the new members section or have a read of this Link to comment Share on other sites More sharing options...
Moderator Airhead Posted January 20, 2014 Moderator Share Posted January 20, 2014 I know it'll cost you more but how about you buy them from yamaha? Link to comment Share on other sites More sharing options...
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