RE: Patriot
I can't believe no one has jumped on this subject in so long. I just wanted to add a couple things to this topic. The Webra 120 is not designed for small props and high RPM's. It is a high torque engine that spins big props with authority. Put a 16 or 17 inch prop on, to bring your engine alive. Don't use high nitro either. 0 to 5% is all that is needed. My friend used 10% until it seized. You should have seen the piston. Pre-ignition beat the crap out of it. Not a mark on the cylinder though. That is what you get from a true chrome cylinder.
If I recall correctly, the Webra 120 is considered the hottest 120 engine. It boasts unlimited vertical on a 14lb bird.