Hello, I have a 2000 Polaris Sportsman 90 that has been sitting for nearly all its life. It's certainly a gem. It's only been ridden a handful of times. Anyways, I replaced the battery, changed the gear oil, cleaned out the oil and gas tank, etc. I go to start it with the electric start and it will not turn over. All I hear is a grinding noise for a second. Anything first thoughts?

Thank you,
Blake