2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 31Get this manual
ENGINE SPECIFICATIONS Item Balancer Balancer drive method Clutch Friction plate (inside dia 120 mm) Thickness Quantity Friction plate (inside dia 128 mm) Thickness Quantity Clutch plate Thickness Quantity Maxwarpage Clutch spring Free length Quantity Clutch housing thrust clearance Clutch housing radial clearance Clutch release method Push rod bending limit Transmission Main axle deflection limit Drive axle deflection limit Shifter Shifter type Maxshift fork guide bar bending Decompression device Device type Air filter oil grade Gear Standard