1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 38Get this manual

1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 38

Tune-Up Procedure 1Visually inspect engine for leaks, missing or loose parts, or other obvious defects2Compression checkProper
piston rings IF the engine shows variation greater than 15 PSI (100 kPa), check for: damaged head gasket damaged pistons
broken or stuck piston rings scored cylinder walls IF the engine has equal compression and runs normally, continue the tune-up
procedure ill ceramic portion of plug is not crackedReplace if cracked to prevent sparks 3Clean and regap or replace spark
plugsMake certain '" 4Inspect and test ignition componentsSee Section 3Replace deteriorated or damaged parts such as wires,
boots, etc which may emit sparks'" 5Replace in-line fuel filterReplace deteriorated or dam- i aged fuel system parts such
as hoses or gaskets which may result in fuel leaksInspect carburetor and primer system 6Synchronize the engineSee Synchronization