It seems pretty happy with the 18 x 8, though I agree that's a bit small. Once it's broken in I'll experiment with larger props. It runs nice and cool though. I did a lot of touch and goes with it as that's great for motor break in. Nice reliable idle and great response. I did some verticals with it, and did not notice any sagging. Keith said a lot of people use a 20 x 8 on this engine, and recommended around 7500 rpms as a good target. We'll see once I get some more time on it...

As for you torque comment, I don't understand why it wouldn't like to spin some rpms though. I usually run my Echo 23.6cc engines near 9000 rpms. Since this twin is made from Echo cylinders and cranks, why wouldn't it like high rpms as well? Of course with twice the displacement it will have more torque, but the port layout is the same as far as when/where the power curve is right? Is it because of the reed valve intake being restrictive??

That makes me think of another question. Other than tuning hassles, how would one of these run with twin carbs?? That would solve the problem of finding those no longer made reed valve assemblies. BTW do you have one of the BME twin blocks you would sell?

AV8TOR