1984 Ski-Doo Shop Manual, Page 126Get 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
11, Magneto housing flywheel
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
15,16, V-belt pulley and starting pulley
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 reassembly
20, Flywheel retaining nut
To remove magneto flywheel retaining nut:lock crankshaft with crankshaft locking tool (PI 420 876 640) as illustrated (magneto side piston must be at top dead center);remove magneto retaining nut