1977 Johnson 2HP Outboards Service Manual, Page 15Get this manual
TUNE-UP PROCEDURE
When owner brings motor to for tune-up, or for minor operating malfunction, the following procedure should used guide to determine the of the malfunctionWrite down the owner' commentsaccurate card file your service shop operationEach service operation should record to the: OWNER'S NAME DATE MODEL NOSERIAL NONATURE OF COMPLAINT NATURE OF WORK PERFORMED COST OWNER WAS WORK PERFOMED UNDER WARRANTY? After writing down the owner' comments, check the motor visually and begin systematic tune-up procedureConsult the Trouble Check Chart to find the of any malfunction which discovered when tuning the motor1Remove exhaust cover and cylinder headSlowly rotate flywheel and visually inspect piston, rings, and cylinder for wear, freeand carbon deposits
Piston ring condition should determined before continuing tune-upGum and varnish deposits rings or piston removed with an application of Accessory Engine CleanerIf piston, cylinder, and rings are considered to
in satisfactory condition for continued service, clean carbon, reinstaH cover, using new gasketClean carbon from cylinder head and top of pistonDo not alter piston deflectorSurface and reinstall cylinder head, using new gasket