1983 Ski-Doo Shop Manual, Page 92Get this manual
SECTION 02 ENGINE SUB-SECTION 05 (503 ENGINE TYPE)
CLEANING
Clean all metal components in non-ferrous metal clean er_ 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;
DISASSEMBLY
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
To remove magneto flywheel retaining nut:
lock crankshaft with crankshaft locking tool (service tool) as illustrated (magneto side piston must be at top dead center); remove magneto retaining nutMagneto housing puller and ring