1975 Johnson 4HP 4R75, 4W75 Outboards Service Manual, Page 35Get this manual
kConnect the high tension lead wires to the spark plugsMake sure that the spring clips in the spark plug lead covers make firm contact with the spark plug terminals1Attach high tension lead anchor mStart motor and check timing with timing lightEach breaker point setting must be such that, when checked with timing light connected to each high tension lead, the flywheel timing mark must line up between the two index marks on the armature plateOperate engine at 1000 R.P .Mfor this testSee Figure21