made sure needle was falling when float comes down 2. Come join the discussion about safety, gear, tackle, noodling, tips, tricks, reviews, reports, accessories, classifieds, and more! if it's not new. I think there is a test given in the manual for your switchbox, and that this could be your problem. Easier to clean, no rust. I have a 1980 70 hp Mercury outboard (serial #(NNN) NNN-NNNN That starts fine and will idle up nicely while in neutral. seemed to rev okay in neutral. In gear, it bogs down and tries to cut off at 1500 rpm. There was an old salt at our duck camp who was a genious when it came to fixing the old Johnson/Evinrude Ducktwin motors, if you had problems you took it to him. try running without the cap. Only thing, when I pull the throttle back to idle, she dies, and, if I rev her up and quickly accelerate, she bogs down and dies straight away, too. This is an electrical thread, but these two systems can act the same sometimes, and we're trying to diagonse the problem. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. The motor will bog and be hard to get on plane (especially with anchors hanging on the back): 1. A little bumpy in neutral idle. I notice that my outboard motor tends to stumble or misfire when accelerating under load if the spark plug gap is greater than the specified or recommended spark plug gap. Other possible problems could be caused by Ethanol blended fuels and their attack on your fuel lines. Never ceases to be funny to see a grown man hop around like that! Take that screw out gently and remove the cap and see if there is any derbish clogged up in it. A few tips to help with a bogging outboard. did compression test on cylinders, #1=120psi, #2=120psi, #3=105psi, granted there is a pretty big … Look at the fuel pump and there should be a big screw right in the middle of it. There are several methods to troubleshooting a stalling outboard engine. Ran strong. On a 1995 motor there is one switchbox, and four coils. Fill it with fresh fuel and stabilizer. having problem with acceleration. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! This is an update on the old talking head video. This is an update on the old talking head video. By finnup in forum Mercury Mariner Outboard Forum Replies: 1 Last Post: 01-25-2010, 01:59 PM. Take that screw out gently and remove the cap and see if there is any derbish clogged up in it. Got a new water pump, LU oil and spark plugs. I ordered Cap, Plugs and Wires from Rock Auto to see if that helps the holeshot. runs great in neutral. Modern outboard engines have come a long way, whether you’re talking about the now-common four-stroke or modern DFI motors.In both cases, reliability is far better than it was in decades past, fuel efficiency has increased, and problems like smoky exhaust and … Ditch the old metal fuel can,dump the fuel line and install a new one.You are most likely getting air in the system.Hard to detect this and when you inspect the fuel line you might not see it or the valve in the bulb can be passing air also.NEVER in my humble opinion,try and run a motor with fuel from a can or container that you didnt purchase and treat yourself.You dont know how old the fuel is or WHEN it was stabilized. ... 75 Mercury Black Max bogs down Not rated yet The motor runs great out of the gate for about half an hour then when I … Willard, thanks for the spark test info. My next step is to grab an inline spark tester and check for spark to try and Eliminate as many issues as I can. Took it out Friday, ran fine at first for 15 or 20 minutes then dropped from 4300rpm down to 3000 to 3500 and wouldn't go any higher at WOT. When I had the boat out last, I kept hearing the sound of air filling or being expelled from a metal tank. Are you trimming the motor ALL the way in, because it sounds like you are not? A manifold leak is easily detected by a hissing sound coming from the source of the leak. The squirt of fuel from an accelerator pump is there to compensate for the lean condition caused by opening the butterfly when you first apply throttle, and before there is venturi vacuum to draw the extra fuel needed for the extra air.
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