Well i took my plane out yesterday to fly and halfway thru second flight the studdering or bogging or whatever you call it just cleared up and it ran like stink. I then had some real fun with it as always before it would run great on ground only to get overly rich in the air.So here i am having a blast now but not really figuring out what had changed to make this thing now run so great. Well in finishing up i noticed a chge in pitch of engine so i set up to land but went deadstick , I was able to land with no probs. but upon refueling i saw my PLASTIC carb mount had let go. Now this engine was sold to me as a version 3 which i have deduced is supposed to have a twister style metal carb mount. Any ideas? Oh BTW i think the vacuumn leak is what made it run so great all of a sudden.