Its an 80 xs650 I turned into a bobber. I've had it running for a few years with zero problem and one day I was out ridding and it just died and started bucking. So I checked out carbs, set valve lash, made sure the cam was in sync with the crank and it was all good. It had spark so I got out the timming light and found out that the timming was 180 degrees out. How the heck does that get out 180 degrees while driving? Any help would be appreciated! Just don't want to start throwing parts at it.
Note some times when I first start cranking it will be right for a few rotations then be out 180.
Note some times when I first start cranking it will be right for a few rotations then be out 180.