1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 30Get this manual
leads off spark plugs counterclockwiseDisconnect lead from vacumn cut-out switchRemove flywheel nut and three flywheel screwsUsing Flywheel (Special #378103), flywheel from crankshaftSee Figure 4-4 I SZ4
Figure 4-2
and COLD Plugs
spark plugsSpark plugs classified cording to the temperatures at which they designed to operate, COLDSee Figure 4-2Selection of the correct spark plug depends the type of service to which it is subjectedUnless the spark plug is properly suited to the motor, trouble arise which might interpreted as carburetor difficultylow trolling speeds will tend to foul plugs due to the not burning from the However, at fuH thrott1e with hotter plug, the operating temperature too high, resulting in pre-ignitionextreme temperature range will difficult to control with plugSpark plugs furnished with the motor selected for average serviceSpark plugs recommended for the 33 HP model 1Champion: J4J 2