hello all, neighbors kid has a crf 80 after 3 weeks of riding and a broken chain. The crank case housing just above the shifter has a terrible chunk wore down into the seal area. Needless to say no help from honda. This bike still has a stock chain on it and after 2 hours of riding the chain is dragging the housing again. So here is my questions two of them.1- will a aftermarket chain on this bike be to wide? 2- Is there a aftermarket roller and bracket or some kind of guide to keep this from happening? It seems to be a very poor design from the factory any comments please help Thanks Steve