I took the engine out of the plane, it seems like the backplate is on tight, and the carb is on tight also. I took the carb off, and the reed valve seems to be closed all the way, so I don't think that's a problem. I did find that the pickup for the flywheel has a bigger gap than I set it at. I put it all back together, we can't fly on tuesday at our field so I take it out tomorrow for tests.