1982 Ski-Doo Shop Manual, Page 122Get this manual
SECTION 02 ENGINE SUB-SECTION 06 (503 ENGINE TYPE)
CLEANING
Clean all metal components in non-ferrous metal cleaner_ CAUTION: Clean armature and magneto using only clean cloth
(jJ) To remove magneto housing (flywheel):
lock crankshaft with crankshaft locking tool (service tool) and adjust magneto housing puller and puller ring (service tool) as illustrated;
DISASSEMBL Y
To gain access to magneto assembly, remove:rewind starter;starting and V-belt pulleys NOTE: Before disassembling magneto plate, indexing marks should be located to facilitate re-assembly