Rumble, I'm surprised no one else picked up on this, but the Fox Miracle plug is a little hot for your engine as it is a four cycle plug. I would think a regular Fox Gold Post plug either with or with or without an idle bar would work fine. Although I've seen on these pages where others have used the Miracle on low nitro engines to get a good idle. I use the Fox Miracle almost exclusively in my four strokes. I'm expecting a MDS 2.18 to arrive today, I'll let all know how it does.