Yamaha outboard runs rough at idle. The carburetors have been cleaned and the fuel pump wa...
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Yamaha outboard runs rough at idle. The carburetors have been cleaned and the fuel pump was rebuilt. 3 days ago · Yamaha Yamalube Outboard Ring Free Plus Fuel Additive – 12 Oz Check Price on Amazon Though marketed for outboard engines, this additive targets fuel system corrosion and oxidation, which are relevant to any engine exposed to ethanol-rich fuels. In this video, I show you the exact common symptoms, possible causes, and the easy fixes you can try at home. It is very jerky at those low to mid speeds and when decelerating. I have new recreation gas in the can and all the lines are good. The compression is 90 lbs in both cylinders. emergency is for just that, for an emergency. Does anyone know if this could be caused by trying to start engine too quick before the display has registered on the gauge showing hours run and rpm ? Nov 1, 2025 · The engine runs very rough until I pull throttle back to trolling / low speed / neutral. Check out this article to know how to get all the idling issues solved in a jiffy. Watch the video above or read on below to learn how to identify and fix problems with an outboard that won’t idle properly. 45K subscribers Subscribe Nov 18, 2011 · Re: Yamaha 40 rough idle / stumble when accelarating and yes I have cleaned the idle The third position is off. I pulled the carbs and again cleaned them, using an ultrasonic cleaner, carb cleaner, torch cleaning tools, and an air compressor. Idles rough when I put it into gear at low RPMs in the water It will idle all day in a hose and runs awesome above like 900 rpm’s. Feb 14, 2026 · Suddenly, I lost the top end again with it refusing to run above the 2000s and running very rough even just above idle. Sep 18, 2019 · Hi. The ‘cure’ is to shut the motor off for at least 60 seconds, restart and away we go at full speed. Nov 7, 2022 · Struggling with Yamaha 4 stroke outboard idle problems? Well, your difficulty ends here. The good news is that the outboard actually runs, so the problem shouldn’t be hard to fix, it's just a matter of finding out what’s stopping the motor from idling as it should. Is there anyone out there that has worked on one? I have 80 psi compression in both cylinders and cleaned the carb 3 times. Doesn't stall and can immediately get back up on plane. Apr 18, 2011 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Jan 26, 2025 · But don’t worry, we’ve got you covered! This part 2 of a 4 part series, where we will be covering common outboard motor issues and provide tips on how to identify and potentially fix them yourself. Read on to discover the top repair issues and how to troubleshoot them yourself. Sep 19, 2025 · New problem - Yamaha F90 runs fine all day below 3000 rpm, when running above 4000 it will fall off to idle after about 15 minutes. Also fuel filter has been changed as well as new spark plugs. This will stop any fuel going through the enrichment system if the enrichment diaphragm is leaking and flooding motor. I recently installed a new cylinder that came with the larger 40mm intake and am now having issues with how smooth it runs from idle to about mid throttle. A rough idle on an outboard is generally caused by a failed spark plug, a clogged or stuck open fuel injector, a clogged or dirty carburetor, or an engine that has an issue with the timing when dealing with a 2-stroke outboard. . Above that it runs smooth and has plenty of pep, gets right up on plane. Fuel system has already been serviced including VST new plugs also . today we dive in to find the culprit of a outboard running really crappy, and the outcome really surprised me personally but was super simple and maybe simpl May 25, 2021 · My 1998 Yamaha 25ELRW outboard runs rough at RPM below 2200. How to fix a rough running four stroke outboard Willamette Valley Marine 6. Nov 7, 2020 · Yamaha 300hpdi fouling plugs, literally in like 30mins, replaced oil pumps, injectors, coil packs, Ecu, with no justice . any help or ideas will be greatly appreciated Aug 21, 2025 · Having an intermittent problem starting my 40 hp 4 strike fuel injection outboard. It starts right up but idles rough and shakes until the RPM rises above 2200. They can answer questions for any Yamaha outboard model or horsepower. I am new to the group and have a 1989 DT15C that runs rough at idle and stalls.
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