Ok, srm99, let's talk about the popoff pressure deal. I have a FPE 4.2 that runs great except it will not transition. Once I get it opened up on the ground or in the air, it is great. I had to put a static line from the carb into the fuse to eliminate in air burble but that's solved. My problem is the engine will die if you don't "nurse" the throttle up after it's warmed up. I've backed out the low needle as much as 3 turns, that won't fix it! I put in a new carb kit with diaphrams, fuel metering needle, etc., no luck. It just won't give a rapid transition.

So, could this be a pop off problem?

Larry