Yes that is the plug.

The "8" will work but you are using the engine in a very tough situation and it needs to run richer and hence cooler. The hotter "F" lets you do that. My "F" plugs will last about two seasons or 300-400 runs easily. Been using them in big OS's for a dozen years or more.

The mount is a commercially avaiable Dubro Iso-mount. I needed the nose weight and the vibration isolation is a big plus. Made the stand-off's. A plywood spacer block would be just as good.

Same web-site for Dubro mount. See bottom of post.

It says it's for a 1.20 but I have used them over and over again on OS 1.40's and 1.60's with no problems. It is a very solid item. The cast Ali drills and taps well for 6 or 8-32 threads so you don't need nuts etc. to hold the engine in place.

Regards,

Eric.


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