Dusty in New Zealand told me about a tool called color-tune. it lets you see the color of the combustion in the cylijnder while the engine is running.You adjust the carburetion so you get the best burn and most power and mileage out of each drop of fuel.
I saw one of these tools at a parts store somewhere(I occaisionally do repairs out of town) and I did not have the funds to purchase at the time.Now I cannot remember which store I was at or which city, It was either Roseburg, Eugene/Springfield, Salem, or Olympia Washington :confused: