I'm checking rebuilding the top end on my son's 2001 YZ250F for next season. During checking valve clearances, I noticed that the cam chain stretch does not allow the sprocket indicator marks to line up exactly on the exhaust cam sprocket on the leading mark. This would be indicative of cam chain stretch.
Just how much stretch is too much???
Basically the top edge of the mark closest to the exaust side is showing on the edge of the head.
Since I've got the bike torn apart I figure I'll replace it anyway.
Just how much stretch is too much???
Basically the top edge of the mark closest to the exaust side is showing on the edge of the head.
Since I've got the bike torn apart I figure I'll replace it anyway.