As discussed earlier on the WRR gearing thread, which evolved into this: I just found out that the chain slider/block arrangement attached to the swingarm can sometimes be chewed through on the bottom run by the chain. On most bikes, you'll be unlikely to catch this because the countershaft sprocket cover hides it. Then one day, you find your swingarm chewed up after you remove this cover for whatever reason. I have a Zeta cover on mine, as I had problems with sticks, leaves and other assorted woods goodies packing in there, and was tired of pulling the cover and cleaning it out. It doesn't cover anywhere near as much, allowing all the crud to just fall out on it's own. It will also allow shoe laces to take a lap on the front sprocket. Don't say you weren't warned. Another aspect of the Zeta cover is quick and easy inspection of everything that is normally hidden in stock form. The last aspect is you can see the buildup of chain lube and other mung. Whatever...it is a dirt bike, not a showpiece. I thought that I had heard of the most common problems, but this was a new one to me. I'm more clueless than I had hoped; that's not likely to improve. Please feel free to chime in on this. How serious it is, is unknown to me. I consider the following contributes to the likelihood of a problem: - smaller front sprocket - lowering link - chain rollers on frame: stock, not working, aftermarket, different diameter, etc. - how often your rear suspension gets near the bottom of the travel range. - loose chain. Or tight chain, more likely than loose. Loose only a factor if it is flopping around a huge amount. My guess is the effect is most likely additive from all of the above. Since for whatever reason my posting of photos doesn't work for me as intended, I'll refer you to here: http://i1178.photobucket.com/albums/x372/Yamaguy55/MotoPhotos/IMG_0474.jpg?t=1306421929 Edited May 27, 2011 by Yamaguy55 Better, revised thought, in red/bold.