The only BB Bengines I have experience with are the Force .28 that came in my CRT RTR and an O.S. VG .21 that I put in a buggy. I have been very happy with the Force engine. It isn't a racer but it starts right up every time, holds a tune, and runs strong. I rarely have to adjust the tune.

My O.S. engine is just broken in but it also seems like a decent engine. It takes a little longer to warm up and runs a little hotter than the Force but that could just be because it is newer.

Both engines idle well and the only times I have had them stall are when i run them out of fuel.

Oh, I have shaft starts on both of these engines but both of them start very easily once primed.