1989 Ski-Doo Repair Manual, Page 31Get this manual
Section 01
(SERVICE TOOLS)
Sub-section 02
SERVICE TOOL PURPOSE APPLICATION
Cylinder aligning tools 377, 503 engines 420 8761 71
To align cylinders
Aligning tool
Twin cylinder engines
ACOO 001 106
Screw M8 25 mm 377, 503 engines