1970-1979 Ski-Doo Snowmobiles Service Manual, Page 102Get this manual
FUEL SYSTEM
TYPICAL HRM TYPE CARBURETOR
1Nozzle check valve 2Friction ball 3Spring 4Primary venturi 5Choke shutter 6Screw 7Spring 8Cup 9-Idle speed screw 10Choke shaft 11Circlip 12Throttle shaft 13Spring 14Throttle shutter 15Screw 16Throttle cable clamp 17Throttle cable bracket 18Nut 19Bolt 20Carburetor body 21Adjuster 22Idlemixture screw 23Spring 24High speed mixture screw 25Spring 26Adjustment module 27Inlet needle 28Inlettension spring 29Fulcrum pin 30Retaining screw 31Inlet control lever 32Diaphragm gasket 33Metering diaphragm 34Diaphragm cover 35Fuel pump gasket 36Fuel pump diaphragm 37Fuel pump body 38Inletvalve gasket 39Inletvalve diaphragm 40Body screw and lockwasher 42Fuel strainer screen 43Cover gasket 44Fuel strainer cover 45Cover retaining screw 46Cable retaining screw 47Washer
Disassembly Refer to Figure and for HD and HR types and Figure for HRM type carburetors1Clean exterior of carburetor with nonflammable solventCAUTION