The gearboxs is from Viking with a ratio of 2.33:1
This engine hase the same RPM has the Rotax, with a smaller weigth.

Honda instal this motor in the formula Ford series racing, and in there outbord marine engine, so that why, this mecanical can sustain a hight RPM

I found another video that explain more in detail from Sun&Fun 2010...........

Excuse my english but it make me practise

http://www.youtube.com/watch?v=cdE33...eature=related