Keep the info coming guys. I am very interested in this topic.

I am a nubee to these gas engines and I am finding good info reguarding things that I never thought to concider before, such as the spark plug. I assumed that you just set the gap and torgue and go! I guess I should have known better because I insist on using only the best glo plugs I can get for my glo engines.

I bought an OS GT 55 and it came with the NGK CM-6 plug in its own NGK box. The box had the gap settings on it but I pulled a dummie and threw the box away before I set the gap on the plug. Just last night I was trying to find the correct gap setting and came up with a spark plug site that said .016 gap. So Question: Is the .016 gap OK for break in and then change to the .018 - .020, that TOM suggested, afterwards. I read last night that auto racers like to widen their gaps on their high performance race engines.

Thanks!