[MrB]

I seem to remember that my 80cc motocross bike (2 stroke) produced 19 hp.

Still, this is a very compact V8, and very cool.

[fireman15]

I seem to remember that my 80cc motocross bike (2 stroke) produced 19 hp.

I was thinking along the same lines. I have a Rotax 2 stoke snow mobile engine on the front of my ultralight airplane that puts out 28hp. It has a single cylinder of considerably larger displacement than your motocross bike, but it is very light and dependable. This V-8 is an amazing accomplishment. But obviously scaling down a V-8 is not done for any practical purpose.