1976 Evinrude 200 HP Outboards Service Manual, PN 5199, Page 18Get this manual
OPERATION (SECOND HOUR): Bring boat into planing attitude and reduce power to 4000 rpm or threequarter throttle (approximate) while maintaining planing attitudeAt intervals during the second hour, apply full power for periods of one to two minutes, returning throttle to original setting (4000 rpm threequarter throttle) for cooling period deposits on rings or pistons may be removed with an application of OMC Accessory Engine Cleaner
If pistons and rings are considered to be in
satisfactory condition for continued service, remove carbon, surface and reinstall covers, using new gaskets
Avoid continuous full throttle operation for extended periods during the next eight hours2Clean carbon from cylinder heads and top of pistonsReplace upper bearing crankshaft sealSurface and reinstall cylinder heads, using new gaskets3Inspect necessaryspark plugsClean or replace as
TUNE-UP PROCEDURE
When an owner brings motor to you for tune-up, or for some minor operating malfunction, the following procedure should be used as guide to determine the cause of the malfunctionWrite down the owner's commentsKeep an accurate card file on your service shop operationEach service operation should be on record as to the: