1978 Johnson 55 HP Outboards Service Manual, Page 16Get this manual
6Inspect fuel pump and linesment and gasket Replace filter ele-
7Synchronize carburetor linkage
See Section 3
11Tank-test and check cooling system operationUse tachometer and test wheel for accurate rpm testsRetorque cylinder head screws after motor has cooled comfortable to touch
8Check propeller for condition and correct pitchSee Section 6