Still no luck. I replaced the glow-plug with a spare that came with the plane, not sure what brand of glow plug it is but it fits.(the plane is a friends of mine's dad's plane; he hasn't flown it in 10 years. He gave me the plane and all the spare parts he had bought for it.). Also, the glow plug that I took out of the engine and the one I replaced it with both have idler bars on them. Could the idler bar be causing me problems?

Whatever the outcome I'm going to order some OS #8 glowplugs as spares (I just bought a Nexstar Select and If nothing else I'll keep them for spares for the Nexstar) and I'm going to order a new spinner for the engine. When the guy gave me the plane, he said he had broken the spinner trying to start it with an electric starter. All I've been using up till this point is a chicken stick so I think I'm going to order a new spinner for the bird (Aluminum? Plastic? does it make a difference?) and try it with the electric starter.

Question about compression; When I was replacing the glow-plug I spun the prop around with the glow-plug out of the cylinder head and it spun around quite freely (made probably 3 strokes on its own before it stopped). Does this compression sound a bit too loose or can it vary from engine to engine?

I checked the muffler and it was clean, nothing clogged. I also blew on the pressure line off of the muffler and fuel moved toward the carb; didn't see any problems.

BTW, jaka, I'm not sure if its a Webra .50 or not. The reason I called it that is because it has the number 50 stamped on a plate on the cylinder. I just assumed () that meant a .50 displacement.