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1986 Mercury 4hp 2 stroke running rough after half throttle {link for video}
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<blockquote data-quote="merc4hp1986" data-source="post: 517311" data-attributes="member: 36078"><p>I appreciate all the replys. Yes it was fitted with a prop but I can't see how that would harm the drive considering it was not in gear and the engine should be relatively cool considering the impeller was sucking up fresh cold water.</p><p></p><p> I hate when threads go cold so I thought I'd come on here and tell everyone what resolved my issue.</p><p></p><p>After cleaning the carb a thousand times, soaking the Jets in carb clean for a couple hours it resulted in the same issue.</p><p></p><p>I gave up initially and found that my neighbor had a nice 9.9 Chrysler that started first pull with two other identical engines for parts all for $150 CAD!</p><p></p><p>After I had a bit less of a reliance and careless for the Merc I decided to rip apart the fly wheel and see if my coils had gone bad.. nope..</p><p></p><p> Before I gave up and stuck it on marketplace for parts I thought I'd give gapping the single point to spec of .020...</p><p></p><p>Anddd voila the thing runs great! The engine idles perfect, no hesitation when accelerating, at any throttle it's not misfiring anymore, and it doesn't smoke like it's about to catch fire haha.</p><p></p><p>I had a huge feeling off the bat it had something to do with the ignition system but just wasn't confident that I wouldn't mess the entire engine up..</p><p></p><p>Anyway thanks again, I really appreciate the time y'all took to respond!</p></blockquote><p></p>
[QUOTE="merc4hp1986, post: 517311, member: 36078"] I appreciate all the replys. Yes it was fitted with a prop but I can't see how that would harm the drive considering it was not in gear and the engine should be relatively cool considering the impeller was sucking up fresh cold water. I hate when threads go cold so I thought I'd come on here and tell everyone what resolved my issue. After cleaning the carb a thousand times, soaking the Jets in carb clean for a couple hours it resulted in the same issue. I gave up initially and found that my neighbor had a nice 9.9 Chrysler that started first pull with two other identical engines for parts all for $150 CAD! After I had a bit less of a reliance and careless for the Merc I decided to rip apart the fly wheel and see if my coils had gone bad.. nope.. Before I gave up and stuck it on marketplace for parts I thought I'd give gapping the single point to spec of .020... Anddd voila the thing runs great! The engine idles perfect, no hesitation when accelerating, at any throttle it's not misfiring anymore, and it doesn't smoke like it's about to catch fire haha. I had a huge feeling off the bat it had something to do with the ignition system but just wasn't confident that I wouldn't mess the entire engine up.. Anyway thanks again, I really appreciate the time y'all took to respond! [/QUOTE]
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1986 Mercury 4hp 2 stroke running rough after half throttle {link for video}
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