Despite (or thanks to) its size, this tiny engine screamed all the way up to an unheard-of at the time 18,000 rpm. The DOHC cylinder head squeezed four tiny valves into each combustion chamber, totaling 24 valves across all six cylinders. Fuel delivery was handled by six Keihin 22mm round slide carburetors fed by five tiny fuel and air jets instead of a conventional main jet. To aid in cooling the tightly packed engine block, the inner carburetors were tuned to run slightly richer. Despite packing six cylinders, double overhead cams, 24 valves, and six carburetors, the entire assembled engine was a packaging masterpiece.