I just broke over 3 thousand miles on the R2 and just really like the bike in the woods, although in my opinion it really sucks on the road, but, last week after 30 ish some miles on the trail and 40 something horrible miles on the road, I heard an odd sound coming from around my left foot area. Well as I was making a downshift to turn left there was no gear to downshift to. I thought the chain must have come off and pulled over to check it out. As it turned out it was the sprocket nut. It had come loose and almost fallen off. I tightened the nut enough to limp home where I torqued it back on and staked it in the detentes on the shaft. Friday I went back to the woods and kept a real good eye on things and so far so good. So, perhaps check that nut on your bike and make sure it is staked correctly. The nut does not look like it was staked down when I bought the bike. I am wondering about blue lock-tite, tomorrow I will call the tech at my Honda shop about the lock-tite question. wilburj