Hi all, could do with some assistance re an issue experienced at a trial today. I have a 2008 beta rev 3. I managed to 5 section 6 today at my local trial, what was actually quite an innocuous looking bank. The bike went down on its side (all rather slowly and painlessly) and started to gain and gain revs (second gear, rear wheel was in fresh air going ten to the dozen). First thing I noticed was that the throttle wasn't stuck open. When I eventually cut the engine, and got the bike upright, the bike would not kick over. I noticed immediately that there was no resistance/a lack of compression when I tried to kick it. Each time I kick it in neutral it's as light as a feather and I can hear something spooling inside almost as if it's become disconnected from the crankshaft. I'm assuming that something has sheared off or I've destroyed the connection. I tried to bump start the bike but to no avail. Does anyone have any idea what the issue is most likely to be? Regards, Stew

Sounds like you have lost compression. Possible cause bearing in mind that bike was revving hard on its side is piston has started to seize and nipped the rings preventing them sealing on barrel. Take piston and barrel off and post photos on here.

Nipped a piston and/or sheared a flywheel key.