1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 84Get this manual
FUEL COCK CLEANING1FRONT BRAKE LEVER ADJUSTMENT CHASSIS
INSp ADJ
FUEL COCK CLEANING 1Turn the fuel cock lever the "OFF"2Disconnect: Fuel pipe 3Remove: Seat Radiator cover Fuel tank cover Fuel tank Fuel cock 4Clean: Filter screen Clean it with solvent5Inspect: Gasket Filter screen O-ring DamageReplace6, Install: Components in above list (Steps "3 and 2")
Be careful not to clamp the fuel cock too tightly as this may unseat the O-ring and gasket, and lead fuel leak