Hi Grumpy and Paul,
I have had a similar problem with the exaust valve coming loose and caused it to backfire and wouldn't turn over sometimes. There was another time I found the carburetor butterfly had come loose and found it's way wedged into the elbow of the manifold and the two screws from the butterfly had worked their way past the exaust valve and in to the exaust itself (muffler). Just an idea though probably not the cause of your problem.
Last edited by roebuck; 29/08/14 09:56 PM.
