The SOHC/4 World Tour is in under way.
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And if it's not the stock plug? I was thinking that might be the case- is it trial and error now to see what will remove it?
Probably has a Champion plug in it which requires a smaller socket. Those plugs were used at one time quite a bit,mainly because they were cheaper,easy to find, and easier to get in because they are smaller at the nut.