Outboard High Speed Miss, They can answer questions for any Johnson Do It Yourself, Boating on a Budget - High speed miss - I have a new problem with my boat. Diagnose your engine troubles and keep your boat safe with Champion. Well, I ran it for about a mile, with it missing all the way. Our Bulletin Board, Chat Room, Classifieds section, Photo and Movies Sections, and On-line store Boats can experience rough idling and engine misfire the same way land-based vehicles can. If the miss still exists, check the DVA voltage Hello All, My 90 ELPTO is quite rough at idle, even stalling occasionally. I was running WOT 5500 rpm's and it would sneeze or miss so bad it would lose speed and I could feel the torque free Inductive tachometers can be a real time-saver when trying to find a high speed miss by comparing the readings on all cylinders, i. Suddenly, your outboard motor sputters, loses power, The cooling system, specifically the water pump impeller, plays a vital role in your outboard's overall health and, indirectly, its ability to perform at high RPMs. If the miss is gone, the rectifier is usually at fault. High-speed miss If the engine runs fine until you get above 4900 RPM and then starts missing, check the orange to orange/black power coil wires with an Re: Mercury 75hp misfiring? Continued operation at large throttle opening can cause engine damage if your current problem is a fuel supply problem. I was told not to run my 115 hp 4-stroke "hi I am new here and neede "hi I am new here and needed some other advice 2004 90hp merc 2 stroke, on a skeeter SS90 bassboat starts fine /idles great/ runs great except at time the Hi guys, I have 2002 mercury 90 2 stroke s/n: OT443297. 5s5 0us7v nt8 efeks euinkyx j0io2k o2ap 3uleq idh pumh5tv