With noiseless chain to make engine sound good.

Enhanced left crankshaft diameter and strengthened  crankshaft to ensure its life.

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

Optimization to engine transmission ratio and exhaustion  system, it makes obvious improvement to engine  performance under middle and low revolution speed.

Fuel consumption for 100 km is low and good exhaustion  suitable for modern life.

Two way starter by electric and kick, meet different need  for different people.