I must admit when I first heard about this my first reaction was the same as Dave's...Yeah, right. This was based on the huge amount of time I've spent flicking over engines and never having heard of it from any modeller I've been around. But there was a similar thread some time ago over on SSW (CL stunt mainly) and a few there said it had happened as well so there must be something in it. The only difference I can think of between my own experiences locally and others overseas is the use (or lack of) of nitro. I wonder if there's some correlation between the amount of nitro used and the occasional start? Nitro isn't good at handling compression which makes me wonder if possibly it can act a bit like ether in model diesel fuel if the circumstances are exactly right. We use very little, if any, nitro in Australia which may be why I've never encountered this problem.