1978 Johnson 4HP outboards Service Manual, Page 11Get this manual
Graham Tester Model 51 1,000 ohms Maximum Secondary Maximum Primary 0.6 ohm Maximum Primary DC Ohms 1.0 ohm (Point Test) Coil Index 60 29 ('vVith Coil Test Minimum AMPLIFIEDsecondary circuit "open") Hi tension lead disconnected
Gop Index
60 (Coil must fire spark gop on tester at this setting
IGNITION COIL OHMMETER TEST
Primary (Low Ohms) 0.1 0.05 Secondary (High Ohms) 275 25
CLEARANCE CHART
POWERHEAD
Piston ri ng gop Piston ri nggroove Cylinder and piston 0.015 Max- 0.005 Min(0.380.13 mm) 0.0040 Max- 0.0020 Min(0.1020.051 mm) 0.0020 Max- 0.0008 Min(0.0510.020 mm)
LOWER UNIT
Weedless Standard PinionBushing in Gearcase Standard 0.0018 Max- 0.0005 Min(0.0460.013 mm) 0.003 Max- 0.001 Min(0.080.03 mm) 0.0015 Max- 0.0005 Min(0.0380.013 mm) 0.0053 Max- 0.0020 Min(0.1350.051 mm) 0.0022 Max- 0.0007 Min(0.0560.018 mm) 0.0067 Max- 0022 Min(0.1700.056 mm) 0.0022 Max- 0.0007 Min(0.0560.018 mm)
Weedless
Drive ShaftBushing in Gearcase