1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 19Get this manual
Gearcase Gear Ratio Lubricant Capacity Shift Rod Height
13:28 (0.46) 25 Comm 2812:21 (0.57) OMC Ultra-HPF Gearcase Lube 11 floz(330 ml) 25 Comm 28floz(245 ml) See Page 6-32
Ignition System ._ Type Power Pack RPM Limit Ignition Coil Magneto Powered Capacitor Discharge 20-30 Rec- 6100 25 Comm- 5700 OMC PIN 582508 Spark Plug, Champion Sustained High Speed 0L16V Fixed Gap OL78V Fixed Gap
Model 20, 25 28, 30 25 Comm
Recommended OL77JC4 0.030 in(0,8 mm) OL16V Fixed Gap
Alternate L77JC4 0.030 in(0,8 mm) L16V Fixed Gap