1974 Johnson 40 HP Outboard Motors Service manual, Page 13Get this manual
TUNE-UP PROCEDURE When an owner brings motor to you for tune-up, or for some minor operating maUunctlon, the following procedure should be used as guide to determine
the cause of the malfWlctionWrite down the owner' s
Clean carbon from cylinder head and top of piStonsDo not alter piston deflectorSurface cyl inde head and reinstall, using new gasketTighten cylinde head screws to specified torqueInspect spark plugsClean and re-gap or eplace as necessaryInspect and tes points, condensercoils, and ignition wiresCheck for spark on each cylin derSee Section for test proceduresInspect carburetor and chokeSee Section 3Inspect fuel pump and linesReplace filte element and gasketSee Section 3Synchronize carburetor and magneto linkageSee Section 4Check propeller for condition and correct pitchSee Section 6Drain and refill gearcase and thoroughly lubricate all components of the motor See Pages 2-4 and 2-5
commentsKeep an accurate card CUe on your se rvice shop operationEach service ope ration should be on reco rd as to the: