1986 Ski-Doo Factory Shop Manual, Page 157Get this manual
Sect.ion 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
CLEANING
Clean all metal components in non-ferrous metal cleanerCAUTION: Clean armature and magneto using 'Y only clean cloth
11, Magneto housing flywheel
To remove magneto housing
- lock crankshaft with crankshaft locking tool (service tool) and adjust magneto housing puller and puller ring (service tool! as illustrated;
DISASSEMBLY
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
PIN 420 a76 655 I
20, Flywheel retaining nut
To remove magneto flywheel retaining nut
-lOCK crankshaft With crankshaft locking tool (PIN 420 8766401 as illustrated (magneto side piston must be at top dead center);