Performing maintenance on a Yamaha motorcycle that has been stored for a few months begins with removing the carburetor. Dust and debris can collect in the ports of the carburetor and cause the engine to bog down and smoke. The most important thing to remember when removing the carburetor from a Yamaha motorcycle is the reassembly process. Motorcycles have a notoriously small working area and the carburetor is located in the middle of various cable paths; labeling these cables or taking pictures of the disassembly process will help when you put the bike back together.
Detach the battery cables and remove the battery from your Yamaha motorcycle. This is a safety precaution since you will be working in a small space around fuel, where a spark from a dropped tool can cause a fire.
Remove the bolts from the seats and tank depending on the make and model of your Yamaha. The carburetor will be located at the top of the jugs directly under the seat or fuel tank.
Turn the fuel valve to the "off" position. Residual fuel from the carburetor will come out but this prevents fuel inside the tank from leaking out onto the work surface. Remove the butterfly clamp from the fuel hose and drain the trapped fuel into a gasoline safe container.
Remove the Allen bolts holding the speedometer cluster in place. Pull the speedometer cluster wires from their clips underneath the speedometer. Remove the intake hose and other air lines from the fuel tank. Remove the hoses from the gas tank to the carburetor. Lift the tank and seat off the top of the bike and set it aside.
Relocate the sensor and air lines that run across the top of the carburetor. Move the lines to the side if they are long enough. If the lines are too short to relocate, label them and remove the obstructing end. Be careful when removing hoses or relocating them. Crimped wire connections, fuel lines or air lines can cause a malfunction.
Remove the throttle cables. Loosen all four Allen bolts in the carburetor plate. Wiggle the carburetor to break the seal on the gasket before you lift it up. Remove the overflow tubes from the bottom of the carburetor. Lift the carburetor free from the frame and pass it between the jugs on the right hand side of the bike.
