1978 Ski-Doo Shop Manual, Page 190Get this manual
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SECTION 04 SUB-SECTION 02, (ENGINES)
ENGINE SUPPORTMUFFLER
REMOVAL FROM VEHICLE
Disconnect or remove the followings from vehicle:Pulley guard and drive belt- Air silencer, throttle cable- Fuel lines, primer and impulse lines- Muffler and rewind starter- Electrical wires (junction block, main ground wire, starter wires)WARNING: Before disconnecting any electrical wire in starter system always first disconnect the battery cable
- Drain the cooling system and disconnect hoses at engine
NOTE: It is not necessary to remove rotary valve oil hoses to remove engine from vehicle, it is easier to drain the system on the workshop bench