I'm absolutely clueless on this one. Are you talking about a nitro engine? I have Kyosho's twin fan electric Lear Jet (2001 model of the year) and several nitro planes, but never saw or heard of a Kyosho nitro engine. I can't imagine Kyosho making nitro engines and no one at the flying field having one or even talking about one. Maybe it's new.
There's also the possibility that one of the popular engine manufacturers makes it with a Kyosho label on it. (Like buying a Kenmore fridge at Sears, made by White-Westinghouse.)
If you can get me some more info, I'll see what I can come up with.