You can take a look at one of the motorcycles this engine powered below, though of course, these days there aren't many surviving pictures of these classic mowers. Odds are Harley-Davidson's ...

Now, a patent filing has revealed drawings of the liquid-cooled ... It will be interesting to see if Harley Davidson also decides to use this engine on their existing platforms as well.

Harley-Davidson have patented a variable ... bid to meet emissions targets for an air-cooled engine. This isn’t the first time we’ve seen drawings for this unit, which breaks with Harley ...

The patent drawings show the engine housed in a Fat Bob frame ... there has been no indication from Harley-Davidson so far on when we can expect first sight of the next generation Sportsters.