Charlie,

Clunk too close to the back of the tank - that is a good thought but I did check that although I failed to mention it in my original post. I have had the tank apart three times looking for a problem. Thanks for a good idea. It has been a while since I checked the actual RPM
with the 11 x 7 prop but I remember it being somewhere in the 8800-9000, perhaps a little higher when leaned out to the max.

sonnytex