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4-42 3. Remove gauge and hose and connect fuel hose to carburetor. TESTING VACUUM NOTE: Make sure adequate fuel is in the carbu- 1. Turn the gas tank shut-off valve to the CLOSED position; then disconnect fuel supply hose from the shut-off valve. 2. Connect a vacuum gauge directly to the fuel pump inlet fitting. 3. With snowmobile on a safety stand, start the engine and accelerate to 2000-3000 RPM for a period of 30 seconds. Note maximum reading of gauge. Reading must be within the range listed. 4. Stop engine. Connect fuel hose. Turn the shut-off valve to the OPEN position. Air-Intake Silencer (Carbureted Models) The air-intake silencer is a specially designed compo- nent used to silence the incoming fresh air and also to catch the fuel that “spits back” out of the carburetors. The carburetors are calibrated with the air-intake silencer in position; therefore, the engine must never be run with the air-intake silencer removed. NOTE: To remove and install the air-intake CLEANING AND INSPECTING 1. Check for holes or cracks in the silencer. 2. Periodically clean the silencer by removing the cover/tool tray assembly and vacuuming the inte- rior of the silencer. Air-Intake Silencer (Crossfire/M-Series) The air-intake silencer is a specially designed compo- nent used to silence the incoming fresh air and also to catch the fuel that “spits back” out of the throttle body. The throttle body is calibrated with the air-intake silencer in position; therefore, the engine must never be run with the air-intake silencer removed. REMOVING 1. Remove the two hood pins securing the hood to the front end; then carefully move the hood back allowing it to rest against the handlebar. 2. Remove the two screws securing the ECU to the air silencer. 3. Using a #20 torx-bit, remove the three screws securing the air silencer to the front bumper assembly. Account for the position of the hood screen. CLEANING AND INSPECTING 1. Check for holes or cracks in the silencer. 2. Periodically clean the silencer by blowing fresh air through it. 3. Inspect the air silencer boot and connector for cracks or wear. INSTALLING 1. Position the hood screen to the front bumper assembly; then install the air silencer into the front end. 2. Secure the air silencer with the three screws. 3. Secure the ECU to the air silencer with the two screws. Air-Intake Silencer (F-Series) NOTE: A number of servicing procedures for the ■ NOTE: preceding a particular servicing procedure REMOVING 1. Remove the hood and the left-side and right-side access panels; then remove the torx-head screws securing the console. RPM psi kg/cm² 1000-2000 3.0-3.5 0.21-0.25 3000-4000 4.5-5.5 0.32-0.39 5000-6000 6.0-7.0 0.42-0.49 Acceptable Fuel Pump Vacuum (2-3000 RPM) in.-hg mm-hg 7-10 175-250 |