1978 Ski-Doo Shop Manual, Page 333Get this manual

SECTION 07 (TOOLS)
ITEM Dial indicator (T.D.Cgauge)414 104700 USE Engine timing, to determine T.D.C
APPLICABLE TO All engine types
Tone timer414099000

Engine timing (static)
All engine types

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives