R90/6 Noise in Trans when rolling bike with Clutch in

I have recently noticed that when I'm rolling my bike out to ride I can hear a noise in the transmission that sounds kind of like marbles or metal plates clunking.

It does it with the bike running or not running with the clutch lever depressed (pulled in) just rolling with 1st gear selected.

Any ideas what this might be?

I would suggest that what you're hearing is pretty normal. With the clutch lever pulled in, there's nothing to keep the shafts from rattling around. When the clutch is engage, you have power working it's way through the input shaft, intermediate shaft, and finally the output shaft on to the rear wheel. So things remain "tight" this way.

You should monitor the spooge that appears on the magnetic drain plug of the transmission. If it's always a light slivery paste, you're fine. If you begin to see larger chunks, then you have something going on inside.

But I think you're fine.

Ok, thank you for the info. I will check the plug.

What year is your /6?

'76

OK, good. The '76 got the updated tranny, better than the early models. The bike is 40 years old has the transmiion fluid been changed out at the proper sequence with the correct fluid. Very important to longevity and good service of the internals. Another little problem can be the speedometer cable boot at the back end of tranny. They dry rot and crack. Water can get into the transmission housing and do big time damage to bearings and other internals. Maybe time to remove the tranny have a professional inspection and maybe rebuild. Good luck with your project.

Maybe you're hearing your driveshaft clunking instead?

Could be that someone dropped a driveshaft bolt into the driveshaft tunnel and didn't fish it out. We had one at our last tech day


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