1979 Ski-Doo Supplementary Shop Manual, Page 135Get this manual

SECTION 05 SUB-SECTION 02 (SPARK PLUGS)
EXPLANATION OLD SYSTEM
Example:

EXPLANATION NEW SYSTEM
Example: X

For Marine Engines, resistant to seawater Electrodes with Platinum Tips Silver Center Electrode Wide-Gap Electrodes.060" Wide-Gap Electrodes.044" Wide-Gap Electrodes.060"

wide gap

.044" (1.1 mm)
wide gap

.060" (1.5 mm)

}speCial

shell or electrode designs

Thread Reach

Shielded, water-proof; built- in burn-off resistor Plugs for 2-cycle enginesElectrodes of precious metals Suppressor resistor, 5000 ohms, built-in Silver ground electrode Standard type Semicovered front electrode

Thread Reach:

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