Just did a full inspection on the bike. Slight abrasion on the swingarm from the chain slider. The slider itself is worn 3\4 of the way through. 11 months time on bike. I bought a new one yesterday and plan to insulate the swing arm from the slider using 1\32 rubber sheeting. Iv'e been using a Regina "X" ring chain. I looked on the CR450 F posts and they have alot of chain slider and slap problems too.