Can anyone tell me why this engine burns out every
glow plug after 5 minutes running time. I have tried o.s. , saito , and fox plugs. The engine runs strong idles fine, and transitions well from idle to full throttle but it won't run more than 1 flight on a plug. The engine is not running hot and there isn't excessive vibration. I'm using 15 % nitro, an 11 x 6 prop and starting it...