1985 Ski-Doo snowmobile Service Manual, Page 149Get this manual
Section 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
CLEANING
Clean all metal components in non-ferrous metal cleaner
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;
,CAUTION: Clean armature and magneto using only clean cloth
DISASSEMBLY
15,16, V-belt pulley and starting pulley
To gain access to magneto assembly, remove'rewind starter;starting and V-belt pulleys
P'N 420876065
NOTE: Before disassembling magneto plate, Indexing marks should be located to facilitate reassemblyP' 420876655
20, Flywheel retaining nut
To remove magneto flywheel retaining nut
AQ09002007
- lock crankshaft with crankshaft locking tool (PIN 420 876640) as illustrated (magneto side piston must be at top dead center);remove magneto retaining nut