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Zs1p60ymj Motorcycle Gasoline Air Cooled Zongshen Engine W150cc. Oil Cooling Technology: Reduces heat load during operation to prolong engine life. Lightweight Piston Design: T-shaped piston with thin ring improves power output and service life. Enhanced Clutch System: 5-piece clutch design provides higher reliability. Special Spray Hole Design: Sprays oil to cool cylinder piston and control temperature. Easy Startup at Any Gear: Allows quick start operation regardless of current gear. Enhanced Needle Bearing: Big-end needle bearing improves crankshaft service life. CDI Ignition Method: Reliable electronic ignition system for consistent performance. High Compression Ratio: 11.5:1 compression ratio for efficient power generation.