OOOps!
I never could get my QBee to run. I bought it after reading a glorious product review by Chris Chianelli. I sent it back to Cox and they said it was just fine.
I never could get it to run. It's the only engine I ever bought that falls into this category. By then Norvel was getting a toe hold in the market with engines that put out great power but were hit & miss for reliability.
Knowing what we do know about all the little tricks to help a Cox engine run better could apply to the QBee, but IIRC mine didn't have enough compression to put out a burp. Fixing that problem is like trying to teach a short basketball player how to be tall.