Evinrude '73, 50 hp Low power

A

Archermj

Recruit
Joined
Aug 1, 2005
Messages
1
I have an Evinrude 1973, 50 hp, model 50373R.<br />The engine starts fine. However, I feel it's<br />running at half power. Compression is good.<br />While the engine was running I unpluged<br />the spark plugs one at a time, when I unplugged the top spark plug the engine continued running,<br />however, when I unplugged the bottom spark plug the engine shut off. I am not sure if I have a bad cylinder or a bad coil. I appreciate any<br />suggestion. Thanks in advance.<br /><br />ArcherMJ
 
S

Scotty's Fujiboat

Petty Officer 3rd Class
Joined
Jun 24, 2005
Messages
93
Re: Evinrude '73, 50 hp Low power

Sounds like no spark on the one cylinder. you should check to see if your points are opening . maybe they need to be cleaned & gapped, also check the gap on the plug for starters. I'm not sure of the gaps, my book only goes up to 1972
 
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