2003 polaris 700 sportsman carb. crakinglike the timming is bad.
 

I have a 2003 700 sportsman carb.mod. it cranks over like the engine timing is off.(like a car motor)
it starts cranking fine then it cranks hard . have problems getting it started if i get it started.
runs OK . I am being told its the camshaft . could that be right ?
Any ideas ? I work on cars for a living and understand most of this stuff on a ATV.
compression is OK 104 and 115.