Hey guys need some help on this one.

My sons B-5 has less than 2 gallons on it. Could not get a tune on it yesterday. Everything was fine except for 2 things.

One was as he went full throttle to clear jumps the engine would make a screaming noise in the air. Half throttle and this wouldnt happen. Cant figure out why. It was only doing this on the track when their was a load.

He kept flaming out as well which very rear does that happen.

We ended up pulling the carb and sealing the neck just in case their was an air leak. It didnt help any thing. We were running a p-3 plug.

Any thoughts on why this is happening. By the way I had two very experienced racers look at and tune it.

Idle was dead on power was there smoke was perfect