1972 Ski-Doo Shop Manual, Page 184Get this manual
2-9-02 IF F EGJ f-' RITiES
TROUBLE SHOOTING
1Leaking head gasket
2Vacuum line leak (T'NT 640 and 775)
3Leaking crankshaft seal 4Spark plug insulation cracked 1Idle or high speed mixture adjustment
too rich 2Choke not opening properly (bent linkage) 3Inlet control lever too high (carburetor floods) 4Idle air bleed plugged 5Welch plugs leaking 6Engine mount loose 7Water in gasoline 1High speed mixture needle set too lean
2High speed jet obstructed
3Inlet lever set too low 4Choke partly closed 5Fuel line or fuel filter cartridge obstructed 6Carburetor: Punctured diaphragm or flapper valves bent 7Faulty ignition system 8Main fuel check valve stuck 9Welch plug leaking
GOQd spark but engine runs on (1) cylinder, (double
cylinder engine)
Engine vibrates excessively or runs rough and smokes