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1991 Mercury 40hp 2stroke 4cy
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<blockquote data-quote="DaleH" data-source="post: 400864" data-attributes="member: 15636"><p>I have the same engine (but 1997) and I would go after the 2 carbs first. On smaller motors I have had some success with draining everything and filling the bowls and a fuel line with Seafoam, and removing the ignition kill (you do NOT want the OB to start ...), then by priming and pulling that mix through everything. Essentially you're trying to fill all the passages up with Seafoam. Then I let it sit for a few days, drain and fill with fresh fuel (and oil if needed) and see how it goes. </p><p></p><p>I'm averaging about 50/50 as to whether I need to pull the carbs and give them a good cleaning. Always clean from small orifice to larger. FWIW I bought the Merc OEM service manual on-line for about $16 if I recall correctly. Well worth it!</p></blockquote><p></p>
[QUOTE="DaleH, post: 400864, member: 15636"] I have the same engine (but 1997) and I would go after the 2 carbs first. On smaller motors I have had some success with draining everything and filling the bowls and a fuel line with Seafoam, and removing the ignition kill (you do NOT want the OB to start ...), then by priming and pulling that mix through everything. Essentially you're trying to fill all the passages up with Seafoam. Then I let it sit for a few days, drain and fill with fresh fuel (and oil if needed) and see how it goes. I'm averaging about 50/50 as to whether I need to pull the carbs and give them a good cleaning. Always clean from small orifice to larger. FWIW I bought the Merc OEM service manual on-line for about $16 if I recall correctly. Well worth it! [/QUOTE]
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1991 Mercury 40hp 2stroke 4cy
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