1 Big power 22KW 30 HP 2 DOHC ,4 VALVE 3 NO ROCKER ARM, RACING POWER, 1. DOHC:AUTO ENGINE TECH 2. 4 VALVE: more air intake ,higher fuel burning efficiency 3. No Rocker Arm: fewer noise,less valve adjusting 4. Racing Power: Higher power and Higher torque 5. Water-cooled System: Professional design , no overheat 6. Balance Shaft: Low vibration 7. Leading design Piston and Piston Ring: ...