2003 Honda ATV TRX650FA Rincon Factory Service Manual, Page 103Get this manual
FUEL SYSTEM Remove the carbu ret heater and space r
AIR CUT-OFF VALVE
Disconnect th acu hose fr om the va cuum joint pipe of th ca rbu reto bodyRemov the screw and the air cut-ott valve fr om the car bure tor bodyRem ov th slow air jet and three O-r ings
Chec he ai cut-off alve and jet fo damageClean he air jet it cleaning solvent and blow ope it compressed air Apply acuu the vacuu ho seTh vac uum sho ul be ainta ined ir sho ld not fl ow throu gh the va lve ports he vacuum is appl ied, and sho ul lo wh en there is no vacuum