1971 60HP JOHNSON LOSES POWER

[MattJill]

THIS MOTOR RUNS GREAT FOR THE FIRST 30 MINUTES THEN SEEMS TO RUN ON ONLY ONE OR TWO OF THE THREE CYLINDERS. AFTER IT COOLS OFF IT RUNS GREAT UNTIL IT WARMS BACK UP. I HAVE REPLACED THE ELECTRONIC IGNITION BOX AND IT DID NOT FIX IT. MATT

 

[DJ]

Re: 1971 60HP JOHNSON LOSES POWER

Matt,<br /><br />More than likely you are losing a coil or two after warm up.<br /><br />When it starts missing, check the spark at each cylinder.