while rideing yesterday in 3rd and 4th gear hittin it hard as soon as I let off for a second I can hear what sounds like the cam chain slapping. 2 weeks ago I noticed the same thing brang the bike home changed the oil and filter, then the next time out same thing. The place I ride is full of rocks and alot of 2nd gear rideing and no niose at all. took the valve cover off ,to look all the valves are in spec going off my manual and the cam chain is tight. maybee I should replace the cam chain and the tensioner, I dont know if its ever been done.