Low Transmission ratio makes the motorcycle speed high, it is

fit to the city road.

Rolling shaft valve arm, decrease the frication between  camshaft and rolling arm,make the using life longer.

Whole set cylinder function could running stable and woth low  noise.

There's a oil pool in the top of the piston, which could increasing  the lubrication.

Double auto clutch makes the transmission smooth.  Special appearance is good.