Well, like I said, I inspected it. I decided late last night to just send it in....again. I called Horizon to and explained my dissatisfaction with the engine. I explained all of the problems to them and once again made known what gas and oil I was using. They shouldn't need to replace a crank this time so hopefully I have it back sometime next week. This is getting old though.

Oh, the burbing at full throttle would go away if I pulled up into a 45 or straight up verticle climb. Just something to cause the engine to lean out enough. I rotated the engine and everything sounded smoothe so I don't know. I didn't want to disassemble the carb too much either.

My CF spinner also is not longer usuable, could that make a whining noise? I've dropped about $250 into problems with the airplane as of yesterday. I was out at the field and my choke servo went bad because I used one with karbonite gears (didn't know they were that sensitive) so I replaced it with the throttle since it was the same model servo and put a mini digital with metal gears on the throttle. I ordered a second mini digital with metal gears since the LHS didn't have two of them from Tower last night. I also ordered a spinner from Tru Turn. About to order a new prop since I was using a Mejzlik and I want to reduce the weight a little bit on the nose.