OK! problem solved. Beleve it or not there was a bell stuck in the engine somewhere. Now I certainly don't know where this came from because the bell is still on the front of the engine! It must have been there ever since I purchased it and somehow it worked its way into the linkage. I can't tell you how many times I've examined the engine carefully and was frustrated. After taking a break and examining it again I carefully turned the engine on its side and the bell dropped out. I want to thank all of you for your advice.
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