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4-25 4 ADJUSTING PISTON VALVE(S) NOTE: On some models, the air-intake silencer is a one-piece unit, and the silencer boot(s) can be NOTE: On some models, the air-intake silencer includes a cover/tool tray assembly and a baffle/ 1. Open the air-intake silencer cover; then remove the 3 Phillips-head screws securing the cover/tool tray assembly to the silencer. 2. Tip the cover/tool tray assembly forward and out of its slots and remove the assembly. 3. Using a large flat-blade screwdriver, remove the resonator tabs from the air-intake silencer slots and remove the resonator to access the intake bores. NOTE: The resonator can be removed more eas- ily by removing the back tabs first. 4. Rotate each idle speed screw counterclockwise until all spring tension is removed. 5. Loosen the jam nut securing each throttle cable swivel adapter; then rotate the swivel adapter clockwise until the piston valve bottoms in the piston valve bore. 6. In turn on each carburetor, place a finger lightly against the side of the piston valve; then rotate the carburetor swivel adapter counterclockwise until slight upward movement of the valve is noted. 7. In turn on each carburetor, place a finger against either piston valve. Rotate the idle speed screw clockwise until it contacts the valve. 8. Compress the throttle lever to the full-open position; then rotate each idle speed screw clockwise 2 complete turns. Release the throttle lever. NOTE: On single carburetor models, the throttle control is equipped with a 2-wire throttle control NOTE: On twin carburetor models, the throttle control is equipped with a 3-prong emergency 733-081C NOTE: If cable free-play gap is not correct, rotate each swivel adapter an equal amount until recom- NOTE: On twin carburetor models if throttle cable free-play is incorrect, the carburetor safety 9. On some models, install the air-intake silencer boot(s); on some models, install the baffle/ resonator and the cover/tool tray assembly. SYNCHRONIZING PISTON VALVES (Sight Glass Method) NOTE: Arctic Cat recommends using the Carbu- retor Synchronizer (p/n 0644-069). If the carburetor 1. Compress the throttle lever until the dot in each sight glass on the side of the carburetors is visible. 2. Rotate each swivel adapter until the dots are equally centered in each sight glass. AH096A |