How to Drain a Yamaha ATV Carburetor

All carburetors used on Yamaha’s line of all-terrain vehicles are affected by the slow degradation of gasoline during storage, which results in a goo-like substance that will clog the carburetor’s fuel jets and passages. Draining the carburetor prior to an extended storage period will prevent this sticky situation from occurring. While many of the smaller Yamaha ATV models provide unrestricted access to the carburetor, most larger utility and sport models hide the carburetor behind the front fender. The draining procedure is similar; however, the front fender and any accompanying body components must be removed from the larger models.


1) Remove the seat from the ATV by using the seat release lever or by unbolting it from the frame by using a socket wrench.

2) Remove the front carrier rack and brush guard, or the grille panel on sport models, by using a socket wrench.

3) Unscrew the gas cap by hand, then remove the front fender from the ATV by using a socket wrench. The carburetor should now be easily accessible within the ATV’s frame.

4) Turn the fuel valve, located under the left side of the gas cap, to the “Off” position. Pull the fuel hose off the fuel valve outlet by using pliers if you intend to remove the carburetor from the ATV.

5) Remove the throttle valve cover, located on the side of the carburetor, by using a Phillips screwdriver. Pull the throttle cable ends out of the throttle valve. Remove the choke cable from the carburetor by using an open-end wrench, if applicable. Loosen the clamps attaching the carburetor to the engine and the air box by using a Phillips screwdriver. Pull the carburetor out of the engine by hand. Skip this step if you do not intend to remove the carburetor.

6) Place the float chamber drain hose, located at the very bottom of the carburetor, into a gas can. Loosen the drain screw on the side of the float chamber by using a flat screwdriver in order to drain the carburetor. Tighten the drain screw after the carburetor has emptied.

7) Push the carburetor into the engine and pull the air box duct over the carburetor inlet. Reinstall the choke cable, throttle cable and throttle valve cover onto the carburetor. Tighten the carburetor clamps by using a Phillips screwdriver. Skip this step if the carburetor was not removed.

8) Push the float chamber drain hose into the gap between the rear of the engine and the swingarm. Push the fuel hose onto the fuel valve outlet.

9) Re-install the front fender, front carrier rack, brush guard or grille onto the ATV. Screw the gas cap into place and reinstall the seat.

Extra Tips:

* Detailed body panel removal and installation instructions, as well as fastener torque values, can be found in a service manual specific to the Yamaha ATV. These manuals may be purchased from any Yamaha dealership.

* Fill the ATV’s gas tank completely and add a fuel stabilizing product to prevent internal tank corrosion and fuel degradation during extended periods of storage.

* Never smoke or work near an open flame while servicing a Yamaha ATV’s fuel system to avoid potential injury and property damage.

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