1971 Johnson 4HP Outboard Motors Service Manual, Page 11Get this manual
TUNE-UP PROCEDURE When owner br ings motor to for tune-up, for minor operating malfunction, the followus ed guide to determine ing procedure should the of the malfunctionWrite down the owner' commentsaccurate card file service service operation should record to theOWNER'S DATE MODEL NOSERIAL NONATURE OF COMPLAINT NATURE OF WORK PERFORMED COST OWNER WAS WORK PERFORMED UNDER WARRANTY? After writing down the owner' comments, check the motor visually and begin systematic tune-up cedureConsult the Check Chart to find the of malfunction which discovered when tuning the motor1Remove exhaust cover and cylinder headSlowly rotate flywheel and visually inspect pistons, rings, and cylinders for wearfreeness, and depositsSPECIAL NOTE Piston ring condition should determined before continuing tune-upGum and varnish deposits rings pistons removed with application of gine Cleaner234
considered to in satisfactory condition for continued service einstall cover, using new gasket' Clean fr om cylinder head and top of pistollsDo not alter pistoll deflectorSurface nd eil1stall cylinde headusil1g l1ew gasketInspect spark plugsClean and regap place necessaryInspect and test points, condenser, coil, and igwiresSee Section for test proceduresCheck for spark cylinderInspect carburetor and chokeInspect fuel and filterReplace filter