With noiseless chain to make engine sound good.
Enhanced left crankshaft to strengthen crankshaft,ensure longer life for crankshaft.
Automatic tension structure with spring,it can automatically adjust tension according to stretching of chain, it can reduce noise from chain movement and prolong chain life.
Engine performance with obvious improvement under middle and lower revolution speed after optimization to engine transmission ratio and air-exhaust system.
Lower fuel consumption for 100km, good exhaust performance, meet the need for modem life.
