1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 63Get this manual
With timing light still connected, start motor and check timing as described on page 4-6, Step 4ADJUST IDLE ADJUSTMENT SCREW SO MOTOR WILL IDLE AT 650 RPM MAXIMUM IN GEAR U NOTE itl!!}!1
If major power head component has been
replaced, or timing pOinter disturbed, check timing pOinter alignmentSee "Timing Pointer Adjustment," page 4- 22TESTING COILS To determine accurately the condition of components of the ignition system, an ignition tester should be used Without the use of test equipment, coils may be replaced needlesslyA wide variety of ignition testers are available from various manufacturers In addition, some automotive testers having the proper specifications can be usedThe use of the Graham, Merc-O-Tronic, or Stevens ignition tester is recommendedDetailed instructions for the use of any tester are provided with the unit; therefore, only general information is given hereSee Coil Specifications, Section 2All components of the ignition system should be checked, even though replacing part seems to have corrected the trouble