I got confused and filled up with regular gas last time. I think we are supposed to run high test, which I have always run in the past. I went ahead and rode it to see how it would run. Seemed to run fine, no issues, plus may have been the way the wind was blowing, but turned 10,000 revs on a section, seems would usually never turn much over 9,000 before.
I used to run low test regular in 2 cycle 100cc engines I raced on kart, was the recommended fuel, at high rev's it burns faster and works better than high test. Maybe, the same with these engines too? Cheers