1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 73Get this manual
Trouble Check Chart (Cont TROUBLE 3lOSS OF POWER (Providing Ignitio OK) (Cont) EPOSS BlE CAUSE OVERHEATING POW ERHEADSee Sec tion Thermostats damaged Thermo cove or gaskets damaged Pressu re con trol val ve damaged Ex haust cover gaskets Ieaki ng Head gaskets leaking {warped head} {water in cy lindersWater intakes obstructed Pump housing air bleed restricted Water passages obstructed Pump plate not sealing {bottom} Pump mpell damoged Motor too hi on transom Pump housing distorted {overheating} Pum hou si ng cover seal worn {driveshaft grooved} Water tube grommet damaged
FGEARCASE See Section Propeller hub slipping Bent or worn propel Ier Bent geor hou sing or exhaust hous ing In correct propel er
ENGINE MISFIRES