id reccomend a 32:1 ratio (which is 4 oz. of oil per gallon of gas)
the brands of oil really dont much matter.....they are all good.........just pick a quality one that is easy for you to get and most importantly STICK with it.....dont run a diff. oil every week........i run pro honda HP2 synthetic...it works great and i have never fouled a plug with it....it also doesnt gum up the powervalves like castor based oils do........it is also blue so you can tell right away if your gas is mixed or not
i used to use maxima super m oil for indoor arenacross races.....that is a good oil as well
-Jon