DRR upgrade to a 70cc kit

[machwon]

Here a run of a DRR50 we just put a Metrakit 70cc cylinder, pipe and PVL on it. Man, what a difference from a 50 to a 70!

[honda400ex2003]

Wow, nice improvement over the whole range. 10 hp is pretty good out of a 70cc. steve

[machwon]

Yes, it is definitely a runner! We're now getting 12 HP out of the 70 motor by reworking the combustion chamber and going from a 21mm oko to a 24 mm Keihin carb.

Still no porting done to the MK cylinder, you really don't need too!