1982 Ski-Doo Shop Manual, Page 270Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 03 (SPARK PLUGS)
EXPLANATION OLD SYSTEM Example: .p
For Marine Engines, resistant to seawa ter Electrodes with Platinum Tips Silver Center Electrode Wide-Gap Electrodes.060" Wide-Gap Electrodes.044" Wide-Gap Electrodes.060"
EXPLANATION NEW SYSTEM Example: wide gap 044" (1.1 mm) wide gap .060" (1.5 mm)
special shell or electrode designs
Thread Reach Thread Reach: ERl
Shieldedwater-proofbuilt-in burn-off resistor Plugs for 2-cycle engines Electrodes of precious metals Suppressor resistor5000 ohms, built-in Silver ground electrode Standard type Semicovered front electrode
L- -l Heat Range