5. FUEL SYSTEM ATV 300/250 Throttle Valve Needle Retainer Pry off the needle retainer and remove the jet needle. Check the throttle valve and jet needle for wear or damage. ASSEMBLY Reverse the "DISASSEMBLY" procedures. Jet Needle Clip Groove Install the throttle valve into the carburetor body. Align the groove in the throttle valve with the throttle stop screw on the carburetor body. Throttle Stop Screw CARBURETOR REMOVAL Remove the fuel tank and carburetor cap. (Refer to "FUEL TANK" and "THROTTLE VALVE DISASSEMBLY" section in the chapter 5) Loosen the drain screw to drain the gasoline from the float chamber. · Keep sparks and flames away from the work area. · Drain gasoline into a clean container. Fuel Drain Plug Loosen the screw on the lock plate for Screw disconnect the choke cable. Choke Cable 5-8