[Dukedesmo]

I was checking the belts on my M900 last week with the intention of leaving them if OK as they're only 2 years old and not done many miles.

But the front cylinder belt was riding against the outer edge of the pulley flange and had left a deposit of rubber dust in the guard.

The only thing I could find wrong was a small amount of play in the outer tensioner bearing - it had a 'click' where it could fall slightly down and presumably this was tracking the belt outwards?

For the sake of £4 each I changed them all whilst there along with new belts, I used C3 bearings as I think it's best due to the heat and dry environment.

I also bought an extra bearing as the same type is used in the clutch pressure plate...