2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 61Get this manual
CABLE ROUTING Install the coolant reservoir breather hose without twisting the hose Fasten the coolant reservoir hose and the coolant reservoir breather hose with clampDo not pinch the coolant reservoir breather hose Install the coolant reservoir breather hose as shown so that there is no slack Install the wire harness so that it does not hang from the rear fender
Pass the carburetor drain hose and carburetor air vent hoses through the hose guide on the engine from the left side of the machine in the order listedDo not pinch the hoses Route the negative battery lead to the outside of the carburetor air vent hose and to the inside of the carburetor drain hose Route the carburetor drain hose between the rear shock absorber and swingarm, and then under the frame