1982 Ski-Doo Shop Manual, Page 131Get this manual
SECTION 02 ENGINE SUB-SECTION 07 (640 ENGINE TYPE)
REMOVAL FROM VEHICLE
Remove or disconnect the following (if applicable) then lift engine out of vehicle Drive belt Muffler Air intake silencer tube Choke cable at carburetor Throttle cable at carburetor Fuel lines at carburetor
1 NOTE: Secure fuel lines so that the opened ends 'are higher than the fuel level in the tank
Disconnect negative cable (ground) from battery, then disconnect electrical connections leading to engine Console Engine mount nuts