In addition, friction reduction measures include an improved valve roller rocker arm design with a new camshaft profile, small, lightweight pistons with a low friction coating, enhanced engine block rigidity and bore circularity, and low viscosity oil. (greencarcongress.com)
VTEC - E is the first version of VTEC to employ the use of roller rocker arms and because of that, it forgoes the need for having 3 intake lobes for actuating the two valves — two lobes for non-VTEC operation (one small and one medium - sized lobe) and one lobe for VTEC operation (the biggest lobe). (en.m.wikipedia.org)
Resin coating is applied to the pistons, and lightweight aluminum material is employed for the first time in a motorcycle in the friction - reducing roller rocker arm. (asphaltandrubber.com)