I am not familiar myself with the Evra engine, it having been introduced before I got involved with gas engine R/C planes. It surely does look like a Ryobi engine.

But I'm curious, the weak point in a Ryobi is the stock connecting rod. Any rpms over 7500 and you are over-stressing the rod and courting disaster. Do you know if the rod was changed/improved on the Evra engines??

I have a Ryobi that I converted myself and hopped up, and it turns an 18 x 6 prop at 8500 rpms. Of course, I don't run it that fast as it wouldn't last long. I have often thought of making a new and stronger connecting rod for it, but STILL have not gotten around to it.....

Thanks,
AV8TOR