Quick question.

[billdozer]

Does anyone know a cheap engine i could buy that would bolt up to a 04 polaris predator 90cc.

[90GTVert]

Welcome to the forum!

If you're looking for new; there aren't any cheap new two-stroke engine packages that I'm aware of. You'll need to browse the used market. It's a horizontal Minarelli clone, but there are many variations so your best bet is probably just checking eBay and marketplace and so on for Polaris Predator, Sportsman and Outlaw 90 motors. The 50 an 70cc versions should fit, if you don't care about having a 90cc.