New style water-cooled engine, with CNC parts, more powerful, also with gear inside the engine Features:1) Engine: 40cc ... mode: chain6) Starting system: pull star7) Tire (front / rear): 90/65-6.5,110/50-6.58) Brake system ... (front / rear): disc brake (manual)9) Rated power and rotate speed ... 310pcsQty/40' HQ: 245pcs Pocket Bike (Water-Cooled with CNC Parts) (3rd Generation)