Re: Plugs.
Typically, you lose one or 2 when you decarb, as the SeaFoam in large concentration doesn't burn very clean. I usually do a decarb, then plug change and a pump impeller job during startup PM in the spring.
BTW, other items, lube by the book, fuel filter, detailed fuel hose inspection, battery load test, fuel pump every other year.
Before ice up, I fog it to a stall, disconnect and drain the fuel system, and loosen the main jets (v6) to spill the fuel from the float bowls.
hope it helps
John
