I just got this engine back from CH. Thanks, Terry. Great work as usual. I will post pics later.

Daniel, I sent the engine to CH brand new, so I don't have any RPMs for it. Terry test run it on gas & CH ignition with, IIRC, a 16x8 and got something like 8400rpm at 5000' elev and 35F. If he reads this thread, he can tell you exactly. I'm gonna try it on glow this weekend and expect to see at least 500rpm gain. That'll be on top of whatever gain I get down here at sea level. I only have 3 single cyl. CH Ignition modules, so one of these will have to run on glow.

I am thinking of putting this 25cc on my WM Super Sport Senior instead of the Saito 120. I like running 5% oil glow fuel - much less clean up and cheap!

captin, yes I did. I have another thread on the Ryobi 31cc glow conversion, so I'll answer your question there if you don't mind. I'm getting somewhat off-topic here.