Originally Posted by robot
maybe the plug wasn't done up properly and unscrewed itself
Yeah, I think that was it...
basically, we were tuning the engine (read: the guy who runs the races was kind enough to tune it for me), and as the engine was at 40 C from the start, it kept on dying quite often. He did some things, it was getting better and better... then once, before I fired it, I inserted the glow ignitor, and noticed that it was a little wobbly... I didn't really think of it as of any importance, and just fired the engine... it ran, untill the plug shot out...
Luckily, we found the plug, and fired it up again, and it ran great! Whenever I order something, I'll get another button, just to be on the safe side, when my current one strips.