1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 11Get this manual
TUNE-UP PROCEDURE When an owner brings motor to for tune-up, or for minor operating ma1function, the following procedure shou1d used guide to determine the of the ma1functionWrite down the owner' commentsan accurate card file your service shop operationEach service operation should record to the: OWNER' NAME DATE MODEL NOSERIAL NONA TURE OF COMPLAINT NATURE OF WORK PERFORMED COST OWNER WAS WORK PERFORMED UNDER WARRANTY After writing di)wn the owner' comments, check the motor visually and begin systematic tune-up procedure Consult the Trouble Check Chart to find of any ma1function which disthe covered when tuning the motor1Remove exhaust cover, intake covers, and cylinder headsSlowly rotate flywheel and visually inspect pistons, rings, and cylinders for wear, freeness, and carbon depositsSPECIAL NOTE Piston ring condition should determined before continuing tune-upGum and varnish deposits rings or pistons removed with an application of Accessory Engine CleanerIf pistons and rings are considered to in satisfactory condition for continued service, remove carbon, surface and reinstall covers, using new gasketsReplace upper crankshaft bearing seal, 2