Had a disaster today, while riding up a section my bike stopped, as if chain came off. No such luck, it has lost 1st and 2nd and keeps jumping out of the other gears. Gear lever is solid to push down past 2nd. The bike is a 2007 REV3 270. When you let clutch out in 1st it stalls engine. I have an entry for ssdt so just a bit panicked,, any help advice would be much appreciated.