line double cylinder, piston movement one up and the  other down, it make engine high revolution speed and  low vibration, ensure comfortable riding.

With chain transmission to avoid noise from gear  transmission.

Adopting automatic tension structure by spring, it can  automatically adjust tension according to stretch of chain,  it can reduce noise form chain movement and prolong  chain life.

Adopting 9-piece imported tooth-shape chain with high  precision, it can make engine better sound with longer  chain life.

Adopting cast-iron rocker arm holder, effectively get rid of  noise form valve clearance change due to heat.

Adopting double carburetor structure to make full and  complete combustion withe lower fuel consumption and  good exhaustion.

With line 2 cylinders to make powerful performance and  stable running.