Thanks to everybody for all the help!!!

I am not to the point of dismantling the engine YET!!!

Unfortunally, the Model Tech Magic 300 does not leave you much room for isolation of the fuel tank, you do what you can do. But I think if that was the problem I would have seen some threads with the same problem.

The needle valve and the fuel system, I have been through with a fine tooth comb. Replaced everything except the needle valve.

I tend to believe I screwed the engine after break-in with the Mac Tuned pipe and running it too lean, but it seems like on the warmer day's I have no problem with it.

I will carry on until spring, but if anybody comes up with some idea's they would be greatly appreciated!!!!

Thanks,

Jimmy