I was racing my R90 this weekend when it suddenly got all rattly and noisy ( even with ear plugs in) I pulled in to the pits and my team mate came running up, we both looked down to the timing window and you could see sparks coming out...:eek1 We pulled the gear box out and the ring gear had come off the clutch carrier ( its post 81 bits). Anyone seen this before? Took just over an hour and we were back in action although now on roller starter. This morning the roller starter did not want to know and pushing was of no avail, fortunately the Trident guys had a rear wheel operated one and it burst into life. Suggestions ranged from " get another one" to " drill/tap cap screws" to " "weld the bastard" to harden up and get rid of the starter and massive battery..... I have to day I never liked the look of it, I'm thinking my higher than std comp may have taken a toll on the rivets. sorry no pics as I was too busy spannering and swearing.