1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 20Get this manual
Gearcase Gear Ratio Lubricant Capacity Shift Rod Height
13:28 (0.46) 25 Comm 2812:21 (0.57) OMC Hi-Vis Gearcase Lubricant 11 floz(330 ml) 25 Comm 28floz(245 ml) See Page 6-32
Ignition System Type Ignition ModuleRPM Limit Ignition Coil Magneto Powered Capacitor Discharge 20-30 Rec25 CommSpark PlugChampion Recommended 20, 25 28,30 25 CommAlternate Sustained High Speed OL78V FIXED GAP NA Alternate L78V FIXED GAP NA 6100 5200 (OMC PIN 583896) (OMC PIN 583664)
OMC PIN 582508