Hi
They did combine classes in that event, next race will be at Philip Island in January 2016 against the Harris XR69's.
The methanol allows you to push the engine further, more compression, more timing advance, helps the air cooled run cooler which is a big deal.
That engine was never tuned for pump fuel, it was always on methanol.
Pistons are 78mm, modified stock barrel with hardened bores.
Presently we only build complete engines because we aren't able to sell anyone a kit because the engine is modified top to bottom so if we were to sell something it would be basically a complete engine, or, something that wouldn't be any different from what you can get off the shelf in the states already.
Merry Xmas
Regards
RPE Racing