My 2 cents..... I use 40 to 1 on everything. YX465, KX400, F9 350, S2 350, Tomos mopeds, etc. As for oil Ive used everything from Kawachem synthetic to WalMart branded Super Tech, to the little Itascha bottle that the 7 eleven sells. No problems. Everything that had oil injection, including my triple, has had it pulled off. I premix everything. I also own an old RX7, which uses a metering pump to inject oil into the carb to help lube the apex seals...some people pull the OMP off and premix those, but I draw the line there. I aint standing at a gas station measuring out 10w40 and adding it to my tank. Also a funny story from the past: In the mid 70s, a buddy of mine had an MX bike that developed a crank case leak, such that it was pulling oil from the case into the combustion area....he ran 2stroke oil in his case for the rest of that season. Swear to god.