1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 43Get this manual

PROCEDURE

Check spark plugsRemove plugs and inspect for excessive carbon deposits
Plugs OKGo to step 6Plugs not OKGo to step 5
Check exhaust ports, cyl inders, and pistonsRemove exhaust covers
Ports, cyl inders, pistons OKGo to step 6Not OKService powerheadSee pages 5-6 thru 5- 14

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives