RE: Welcome to Club SAITO !
F, all I have used in my Saitos since 1993 is WildCat 10% Premium Extra and a little of their 10% Extra which I keep for my RCVs. They thrive on it. Before that I used Fox 15% nitro fuel with 20% castor, that actually worked well also. But, back then I was "dumber than a mine mule" about fourstrokes.