I know not to use water on its own cause of the ally head, but wandered if Honda have some premix they recomend? When I've rebuilt car engines I've always used the recomended coolants etc.. rather than mixing water and antifreeze.

I was thinking the A747 would be the best 2 stroke, alot of people seem to use it.

But the gearbox oil I'm not so sure on, anyone know what Honda recomend, or what would be best for track use (ie: a different grade?)?

What gearbox oil is the most common?

I cant remember what I used to use when I had my KR1S many moons ago!!