I haven't had any problems with tuning my glow engine ... i got the raptor with the engine pre-installed. If it's hot outside and it won't start, it probably isn't rich enough, click it a couple of times. If it's cold outside and it's not wanting to start, it's too rich, make it thinner by clicking it back a couple of times.

It's not as precise as cars. Cars have to be just right or they overheat or run crappy ... helis have a big huge built in fan circulating air all around it, overheating isn't a real problem.

The downside is that you can't fly it in the house ... but as big as this thing is, it barely fits in the house anyway.

I highly recommend the Raptor ... cheap and so far so good with learning to fly and operate.

Greg