Frogslayer
Well-Known Member
Here are some pictures of a 110cc opposed piston 4 stroke designed by Pinnacle:
According to the link it makes 7 HP @ 6500 rpm.
P.S. Here is a video with Pinnacle engines demonstrating how the sleeve valve works:
Looks like a nightmare on the inside. They'll never be able to produce an affordable version before battery tech advances just a little farther rendering the power to weight ratio of this engine obsolete.