Hello,

I've had an R/c boat before with a .15 glow engine and Im currently trying to start my .61 glow engine for my planes Break in period.

I filled the gas tank, adjusted the needle valve and hooked up the glow plug. I gave the propeller two spins with my chicken stick and the last spin made a
really loud POW sound. Really loud.....

I was woundering if it was normal or maybe some kind of back-fire or something...This engine is four times as big as my last one, so im not sure