I've just built a GP Ultimate 40 and everything came out just as it should. However, I used a Como .51 off a Cap 232 that bit the dust with a bad servo. Problem is that this Como has always been a great engine, (has a pitts muffler on it so I mounted it sideways), but everysince the crash and the transition to the new plane, it doesn't want to suck fuel. I can't find docs regarding this engine and don't know what else to try. If I put fuel in the carb it'll start if you look at it crooked....just cant get it to draw correctly... started out with an ez fueler on it and wound up takin it out to relieve pressure cause I read that It can cause some prob's. Even still without it I can't get to run evenly or even start consistantly without priming and then it may die at an idle...anybody out there have any familairity with these engines...it's a great runner when it's got gas..but there't two screws..one close to the needle valve and another one where the throttle linkage is...all help would be great and thanks in advance. I have other engines I could use but this is such a sweet engine for this aircraft.