ORIGINAL: ljones5000
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
Does the low speed needle make any differance could the low speed ports in the carb housing be plugged? Could the base gasket on the carb be leaking causing an extra lean condition? If the base gasket leaked it wouldnt die when you backed all the way off the throttle.