Grizzly help.
 

I got a 1998 grizz 600 it was a basket case when I got it. Complete but no piston. After jug and piston install all runs good. I have gone through 3 starter drives and 2 flywheels. And now need them again. What is causing this. I would like to know before next replacement. Only ride other 5 or 6 times a year prob 20-30 miles a ride. And I push snow in the winter when we have it. Been going on 2 yrs now. All help is great full. Thanks in advance.