1985 Ski-Doo snowmobile Service Manual, Page 348Get this manual
Section 04 ELECTRICAL SYSTEM Sub-section 03 (SPARK PLUGS)
EXPLANATION OLD SYSTEM
Example:
EXPLANATION NEW SYSTEM
Example:
C Copper core center electrode wide gap .044" (1.1 mm) wide gap
For Marine Engines, resistant to seawater Electrode with Platinum Tips Silver Center Electrode Wide-Gap Electrodes.060" Wide-Gap Electrodes.044" Wide-Gap Electrodes.060"
4 designs
Thread Reach
Shielded, water-proof; built-in burn-off resistor Plugs for 2-cycle engines Electrodes of precious metals Suppressor resistor, 5000 ohms, built-in Silver ground electrode Standard type Semicovered front electrode
Thread Reach
A Thread reach -.460" standard electrode Thread reach .460" extended tip electrode Thread reach 34" regular electrode Thread reach 34"extended tip Thread reach 38" regular electrode Thread reach 38" extended tip electrode Thread reach 34" extra extended tip Extra extended tip Platinum electrode Silver electrode