1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Manual P/N 500612, Page 38Get this manual

1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Manual P/N 500612, Page 38

Tune-Up Procedure 1Visually inspect engine for leaks, missing or loose parts, or the obvious defects2Compression checkProper
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 ill Replace deteriorated or damaged parts such as wires, boots, etc which may emit sparks '" 4Inspect and test ignition
componentsSee Section 3 ill aged fuel system parts such as hoses or gaskets which may result in fuel leaksInspect carburetor
and primer system '" 5Replace in-line fuel filterReplace deteriorated or dam- 6Synchronize the engineSee Synchronization