I just picked up (what the seller told me) was a 1983 Polaris Indy Trail 488 fan cooled. After checking out some things I dont' think they made a 488 f/c in 83. I'm thinkin it could be a 86, but not sure how to find out. I can't read the manufacture date on the side plate. Can someone tell me how I can tell what year it is? Any help would be grateful. Thank you from Pennsylvania (where we haven't had a flake drop yet...uhhhgg!!!!