About that engine failure thing... we all had to learn to adjust the carburetors on our glow engines. It can be frustrating. It involves making sure the two screws (a "low end" adjuster, and the "High RPM Mixture" screw) are adjusted, in different fashion.

The large thumbscrew is adjusted with the engine warmed up and running at full speed. RPM is maximized by turning the screw slowly, after which it is "richened" a click or two. The low end screw is used to make the transition from low to high RPM smooth. There should be instructions with your engine, and there are definitely better instruction procedures recorded on the Web!

To top that off, I'll relate a recent failure of that procedure. My new student is long retired, and has a plane he started building some 20 years ago. The old K&B engine runs fine - on the ground, at low speed. At full RPM, or in the air at mid-range RPM, it dies after perhaps 3 minutes. No amount of richening on my part would help.

Finally, in desparation, we pumped out his Cool Power 15%, and pumped in a tank full of my Cool Power 10%, and went for a 9-minute instruction flight. The longest it's run so far. So, I think it has something to do with the fuel, and perhaps the design of the engine.

Anyway, good luck with that engine, and your flight program.
Dave Olson