Randy,

Thanks for the compliment!

Actually... the engine on the right is a Mark Lubbock designed "Midge" (It's an unofficial Motor Boys offering. ) It's a real sweet runner and fairly easy to build.

You're actually pretty close on the other one - it's my take on the EZE engine series by Tom Crompton (which of course is an off shoot of the Little Dragon series). I have done a few things different than Tom's design so I feel rather comfortable calling it my own. More details can be found on the link I provided earlier.

Funny you should mention the Imp... just last night I was looking at Ron's site and that one caught my eye. I thought about designing something along those lines as my next project. Where'd you get the plans? If they're readily available that may be the best route to go. Ron mentions that the Imps had a replacable "timing ring" of sorts that alters the cylinder sleeve height and subsequently the port timings. (7/64, 1/8, and 9/64") - Is this what your plans show?

-Joe