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Re: 1998 Johnson 4 HP outboard

Posted by Xcusme on June 27, 2006 at 11:45:52:
Your probably running on one cylinder. While running, pull one plug wire. If the motor changes RPM's , then that cylinder is OK. Put wire back on the plug. Remove other plug wire, watch for drop in RPM's.
The wire, when removed, that does not produce a drop in RPM's points to a dead cylinder. The dead cylinder can be the result of a fouled plug, bad plug wire, faulty power pack, bad compression etc.