Yes, I agree. Fuel/oil/nitro combo requirements for each engine are as varied as prop diameter and pitch. Most of us just don't bother to experiment. I'll be interested in Frank Bowman's view on this end gap issue. Honda recommends an end gap of .0118 on my 500cc 4 cycle single. If the .004"/1" piston diameter guideline were applied .014" would be acceptable. At .0197 honda specifies replacement. It looks like Honda leans toward .0035/inch. Interesting.

Bill