I to am in Japan (Okinawa) and had to change fuel brands when I got here. I have a Revo with a STS.21 and a Kyosho sp2 and I run the Klotz 20% in both. I would recommend this brand and suggest the 20% as you are new to nitro, you will give up a little overall performance but your engine should run cooler and last longer. Hope this helps and good luck.