Hi peeps my name is Gus from australia. I bought an xtr 250 with the air cooled ohc engine and I'm blowing up gearboxes like crazy. I'm about to put in my 3rd gearbox and 'm not even due to change my first piston rings. These engines are found in the galaxy xtr 250 and the pitster pro xtr 230. The gear I use the most is 3rd and it's the one that ends up with no teeth left so I figure these gearboxes are made poorly. Does anyone know of a japanese made gearbox that is compatible with my engine? It's a cb250. Any help will be greatly appreciated.

Gus.