Gidday Lads
Have got a '21 with a '28 motor. Just recently the bike has developed a light clicking/clunking noise when pushing it around the shed by hand in neutral. it is louder when rotating the back wheel fwd than in rev. I suspect a noisy gearbox output shaft bearing. Could this be the case do you think? The chain has been tensioned IAW advice elsewhere in this site, although 15mm of slack feels bloody tight to me

If so, is it an easy fix to swap this bearing or does motor come out?

Thanks
Richard