1983 Ski-Doo Shop Manual, Page 83Get this manual
SECTION 02 ENGINE SUB-SECTION 05 (503 ENGINE TYPE)
ALPINE MODEL
REMOVAL FROM VEHICLE
Remove or disconnect the following (if applicable) then lift engine out of vehicle Drive belt Muffler Air intake silencer tube Fuel lines at carburetor
_CAUTION: Secure fuel lines so that the opened ends are higher than the fuel level in the tank