I had a 97 Polaris sportsman 500 given to me by my grandfather the other day, it has been sitting for a few years, but the problem is, someone hit a tree stump while riding it a few years ago and it messed up the front left side, all of that got fixed a few years ago new strut, new a arms and everything was straightened out, after my grandad fixed all of that he tried to crank the motor up and he said it cranked up for a minute and cut right back off and he couldn't get it to turn over again, so a while back I was over there and I tried to crank it with the pull cord and it won't move at all, I put a battery in it and it wouldn't do anything, I pulled the starter and it is good, pulled the cover off the belt, all of that looks good, pulled valve cover and that looks good, I'm just trying to figure out if i need to pull the motor out and start tearing it apart or where I need to start here, any help would be greatly appreciated