To wake this thread up again. I was curious, I have a BME 110 where the engine starts great and has a good clean idle at 1100-1300. Im still learning to set this up as its my second gas engine. Its on JMB cannistors w/ a Biela 28x10 prop.

So advancing the throttle to 1/3 open the engine is very responsive, no hesitation. Advancing the throttle further and/or after taxing out to take off the throttle advance through 1/2 yields a fairly flat result, but the runup in the pits doesnt seem like the top end is too lean.

For me it seems like there is a lean spot in the transition, the engine doesnt burble or pop or anything that to me would seem like a rich low speed needle setting. I have been working the low speed needle richer but it seems OK now. My thinking now is to start taking the main needle richer to see how the transition is affected....make sense?

thanks for any comments.