1) 49cc Zongshen engine 2) Fr/Rr 3.50-10 3) durable, low weight Crankshaft 4) Improved curve of cam 5) 1 year warranty SUPERIOR ADVANTAGE IN COMPETITIVE MARKET Perfect air cool 50CC 4 stroke engine.Using durable, low weight Crankshaft, maximizing fuel efficiency and output of powder.Surface of the engine: Metallic paint. Major cooling parts got polishing treatment, maximizing cooling area, ...