Bad plugs experiences?

[toydoc]

So how may NGK's have you gone thru?

Did you try and switch the fouled plug to a good cyl? Alot of times the heat from the cyl that was working fires up a cool wet plug fine.

I'd run sea foam also. That plug maybe telling you something

 

[Backwoods M Max]

I just had this one bad one. I've never had one go bad before. I have huge fields right across the road from my house to test in, so no need to mess around with plug swaps. I pulled into the garage, took another plug from my box of 10, checked the gap then threw it in and went right back out.

And I'm running 91 ethanol free, start every season with clean dry carbs and a dry tank.