I have been a member for 20 odd years and run a R80/7. I have become aware of the gasohol dilemma and investigated float replacement need. A mechanic of repute advised me to use high test in my lawn mower to prevent damage to the carb system. His reasoning was that high test fuels DO NOT contain alcohol additives. If this is true than obviously there is no need for float modification in Bing carbs as long as one uses high octane fuel. I have always used high test in my R80/7. I am open to comment.
Sincerely
jschardt @uic.edu