My little ASP .12 engine seems to have inexplicably lost compression (not totally, but I'd say about half of what it was). Now it won't start for even a second at all. I've checked everything, from the compression shims to the glow plug. I cannot think what it could be. It seems to have literally happened between tanks for no reason at all.
I'm stumped here, is there anyone who could shed some light on this?
Many thanks,