This is a sled I'm building, hopping to have her out this winter.. 1973 Silver bullet with a 1993 Polaris XLT 600 engine complete with the Polaris rear skid and drive train. Should go pretty good.
I actually had one of those Polaris 600's. It was a ripper. Unfortunately I had too much trouble starting it in the cold which is not a good combination for a snowmobile. LOL
I really just wanted to upgrade at the time I hadn't paid much for it, it ran great for quite some time and I just let it go.