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"New" 15hp 2010 Mercury intermittently runs great, then the next second, rough.
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<blockquote data-quote="cricketchaser" data-source="post: 468860" data-attributes="member: 25110"><p>Hi guys. I just purchased a 2010 Mercury (Tohatsu) 15hp 4stroke. It appeared to be rarely used as there were no scratches on the prop/foot. It ran great on muffs at the previous owner's house. Today, I took it out for the first time. Initially, it cranked great and idle smoothly. I let it warm up for about five minutes, and proceeded to slowly open the engine up. It was accelerating smoothly until it got close to WOT when the RPMs dropped and the engine started running rough. After that, the engine would intermittently idle and run under part throttle fine, then the next second, go back to rough with reduced RPMs. It would try to accelerate, and sounded fine, until it got to half throttle or se. Then, it would start coughing and generally being unhappy with life - going back in forth from running great to running rough.I pulled each plug wire, and each time the engine died. I used a fuel tank I already had with fresh gas. Any ideas?</p></blockquote><p></p>
[QUOTE="cricketchaser, post: 468860, member: 25110"] Hi guys. I just purchased a 2010 Mercury (Tohatsu) 15hp 4stroke. It appeared to be rarely used as there were no scratches on the prop/foot. It ran great on muffs at the previous owner's house. Today, I took it out for the first time. Initially, it cranked great and idle smoothly. I let it warm up for about five minutes, and proceeded to slowly open the engine up. It was accelerating smoothly until it got close to WOT when the RPMs dropped and the engine started running rough. After that, the engine would intermittently idle and run under part throttle fine, then the next second, go back to rough with reduced RPMs. It would try to accelerate, and sounded fine, until it got to half throttle or se. Then, it would start coughing and generally being unhappy with life - going back in forth from running great to running rough.I pulled each plug wire, and each time the engine died. I used a fuel tank I already had with fresh gas. Any ideas? [/QUOTE]
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"New" 15hp 2010 Mercury intermittently runs great, then the next second, rough.
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