Mik,

I use Mercury Quicksilver and 91 pump gas, these engines do not need high octane fuel, high octane fuel is used for high compression engines 17:1 and the like, higher octane may also make your aircooled engine run at a higher temp, I like Mercury's oil, there are a leader in 2 stroke technology and Quciksilver is TCW3 to help control carbon on the rings, its also approved for air cooled engines as stated on the bottle.


Good Luck,
Mike