1980 4-cyl 80hp. <br /><br />Tough to start when cold, eventually runs, though seems to be missing on at least 1 cylinder, down on power, lousy throttle response, smokey (rich exhaust, as at least 1 cyl not firing). After initial startup, it starts fine, just touch the key and it's running.<br /> <br />After running a while (~1 hour), something fires, and it runs like a champ with full power, snappy throttle response, etc. Joy to run at this point.<br /><br />Next morning, same thing... Just cleaned/rebuilt carbs (though it was happening last season too, was hoping, but not really expecting that the carb rebuilt would do the trick), fresh plugs, new impeller.<br /><br />I'm thinking switchbox is the most likely culprit or maybe trigger? Possibly a sticky ring, but I Seafoamed last season, no effect on this problem, is leading me to think electronics. Though I've never done a compression check on this motor, cold or warm...<br /><br />How can I diagnose, other than just throwing expensive parts at it?
