Cushman scooters are interesting throwbacks to the 1960s, but a lot of owners seem to think the little single cylinder engine that came from the factory isn't quite enough. You see a lot of Briggs and Stratton Vanguard v-twin swaps and they give it a nice boost, but others figure they might as well go all the way and they shoehorn a Harley Davidson Sportster engine into the frame. I have to admit, I like the way they think.
This 1964 Cushman Eagle has a 1000cc Ironhead V-twin from a 1980 Sportster. According to the owner, the frame is a combination of Cushman and Sportster which probably isn't a bad idea since the original frame isn't designed for anything like this engine.
I've seen a number of these conversions over the years and they look pretty neat, they certainly sound better than the little single you would expect to see, though I don't know how they handle at the speeds easily attained with the added power.
If you're looking for something that's definitely uncommon, here's your ride. It's for sale on eBay.