Thank you for the information. I'll take that to the LHS when I buy fuel. I'm going to get an A3 and a type F plug and a Tower Power if they have it.

A buddy suggested 15%: but the plane is overpowered as it is, for that reason there's no reason to put additional strain on the motor, and I don't think switching to 15% is going to make it run any better over 10% (unless my 10% is bad or the lubricant is causing problems)

I am going to check the o-ring when I get home too.

Dumb question: If Evolution sells or designed the motor and they say it needs a H9 "super plug", aside from the fact no one carries a super plug, why would another plug work better? I mean if another plug made that much difference, why wouldn't they recommend it or sell the motor with it? Or at least buy plug type "X" and put their name on it, in which case buying type "X" would be the same thing as a super plug?