1989 Ski-Doo Repair Manual, Page 50Get this manual
Section 02 ENGINE Sub-section 01 (247 ENGINE TYPE)
NOTE: Crankshaft can be locked with crankshaft locking tool (P IN 420 8766 40) inserted in pulsation line fitting
To check air gap, insert feeler gauge of 0.25-0.38 mm (.010 in :-015 in) between magnet and coil endsIf necessary to adjust, slacken retaining screws and relocate coil
12, Magneto housing
To remove magneto housing (flywheel)use flywheel puller (P IN 4209762 35) and magneto housing holder (P IN 420 9765 50) as illustrated (or crankshaft locking tool (PIN 420 8766 40)
Feeler gauge
Checking air gap
A002 002 001
ASSEMBLY
Clean crankshaft extension (taper)Apply Loctite 242 (blue, medium strength)Position magneto on crankshaft with the keyway and the cam notch indexed as illustrated:
Magneto housing holder iP420 9765 501 Centrifugal lever operation Keyway Rotate cam