1970-1979 Ski-Doo Snowmobiles Service Manual, Page 104Get this manual
FUEL SYSTEM 5When carburetor is fully disassembled, perform Cleaning and InspectionCleaning and Inspection
WARNING Most carburetor cleaners are highly causticThey must be handled with extreme care or skin burns and possible eye injury may result
of throttle return springReplace all worn parts5Inspect mixture needles and needle valve seating surfaces for pitting or wear (Figure 9) and replace if worn or damaged
1Clean all metallic parts in carburetor cleaning solventDo not place gaskets or diaphragms in solvent or they will be destroyedCAUTION Never clean holes or passages with small drill bits or wire or slight enlargement or burring of holes will result, drastically affecting carburetor performance