ORIGINAL: bigtim
I am with the gang on this one run the same stuff in 2 and 4 strokes unless your running a YS engine which likes 20%nitro, 15% nitro 20%oil will be fine
YS will run fine on the 15% too I've found. Perhaps it isn't putting out its full potential but they still run very well. I'll have to try 20% one of these days just to see if there is enough difference for me to justify it.
Ialso like the Cool Power 15%. Usually readily available around here and has always worked great.