Some good points to check Shmo. Had occasion the other day to want to fly a new plane/engine combo. We tweaked the engine and thought we had everything just right and all of a sudden the engine kept dying on throttle up- The muffler had moved a little and pinched the pressure line! That was a S.T. 61 and a slight kink shut it down. Yes, by climbout I meant take-off. Twice I had to rebuild the front end when it stalled at low altitude. I asked about 4s's because I've spent several years scratching a Fiesler Storch with inverted Saito 80 4s. Despite their supposedly fantastic STOL capability, I hear they are definitly not a power off airplane. Bill S.