Outboard motor low rpm under load. Type and Octane possibly old fuel 2. In the same boat setup, 16 foot rib. Check 1. Can rev up to 5k in neutral but in the water under load it If you prop to 6000 rpm with a heavy load, you'll need to watch the tach with a lighter load and avoid over-revving the motor. Will Run 5300 Rpm. The motor ran well and did not run rough or miss. Why is your outboard not reaching top speed?Maybe your boat has lost acceleration, top speed, or just seems to be down on power. This guide explains how to identify and fix each issue. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. 6-liter Evinrude E-TEC, for example, has a WOT range of 4850 to 5850 rpm. Restricted fuel pickup tube or anti siphon valve Fuel Jul 8, 2023 · To fully appreciate the potential of your 2-stroke outboard engine, addressing and resolving the issue of incomplete RPM is paramount. After running for a while at high speed, if I bring it down to a stop or low RPM, then try to accelerate it bogs out while trying to go over 1,500RPM. Is your outboard motor not running at full power? Discover common issues and solutions with Rev Tech Marine, serving Virginia Beach and Hampton Roads. I am presently having a similar problem with my motor and trying ideas to figure it out. Got a 95 Pro v 150 on my Ranger 461 vs. Didn't stall at all just lack of power. That RPM may go up with a light load of fuel or passengers and lower with a heavier load—by propping for the middle of the range, there is leeway in either direction. Tohatsu offers some of the best outboard two-stroke and four-stroke motors, which are also widely known as “bullet-proof” outboard motors. 2000 model year 50hp Johnson Outboard motor. If your outboard motor is not running at full power under load or bogging down at full throttle, the most common causes include a spun prop, fuel line air leak, spark plug corrosion, or debris in the propeller. Here is a list of possible causes of low WOT (Wide Open Throttle) rpm. Propeller pitch or diameter, damaged blades 3. Less fuel means less oil to lubricate the workings. They can answer questions for any Yamaha outboard model or horsepower. 1. 5hp-300hp, these outboards are quickly becoming favorites of boating enthusiasts. Besides being such an amazingly reliable outboard motors, they still have some common troubleshooting issues that most users encounter. A Quick Overview to Boat Gas Tank Vent Issues and The Reasons Behind Them: Outboard Engine Bogging Down? How to Troubleshoot Low RPM & Idle Issues on Water. Burnt out spark plugs and coils 5. Tangled Propeller If your outboard motor is not running at full power under load, one possible cause is a tangled propeller or fishing line restricting movement. But if your RPM is so low, you may have more serious issues with your vessel. For older two-stroke motors the WOT range is typically 4500 to 5500 rpm. Restricted fuel pickup tube or anti siphon valve Fuel Engine started fine, revs fine in neutral but once over 3000 revs in gear loses power under load. Have a 1985 yamaha 115 and it wont go past 2k rpm under load. Engine timing out 3. However, like all engines, outboard engines are prone to specific issues. i think ur right the carbs need to be torn apart and soaked overnight, then blown thru all the passages to make sure there clear . But I’m in the second Mercury outboard that I had bought new, Then I’m not used to outboard problems. It is made of high-strength material that can withstand the rough weather and waves at sea, ensuring your safety and comfort. I Kill Each Cylinder Individually And It Runs Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Check out possible reasons here. It has gotten worse and now will start cutting out and choking down 6 HP 2 Stroke Outboard Motor, Outboard Motor, 6HP Boat Engine. By the way, these tips aren’t specific to 3000 RPM – they could also help you if your boat won’t go over 2000 RPM under load. Shakes And Runs Rough Off Idle And Up Worst At Around 3000 Rpm. Starts And Idles Okay. 140-145 Compression In All 4. Unwanted vibrations could be more than annoying; they could be doing some real damage to your boat. Crossed coil signal wires, can cause a damaged piston Mar 22, 2016 · I am presently having a similar problem with my motor and trying ideas to figure it out. Can't get it in for service until jan 2 either so anyone got any ideas that may solve my problem. This should be the first thing to check if you’re having RPM troubles. Outboard Engine Bogging Down? How to Troubleshoot Low RPM & Idle Issues on Water. however, the motor was cold when I started it, much like when I went out the other day, it didn’t start running rough until I had ran it for a distance. Can’t figure out why? We’ve got you covered with a list of what to check. The most common issue is that a boat won’t go over 3000 RPM under load, even if it used to go higher on full throttle. I do know that revving an outboard with no load is a big no no because for a given rpm the motor is using far less fuel. Carbon buildup can be a potential problem if a Yamaha 115 is operated solely at low RPM’s. Fuel filter, pump and carb are all working fine. Step-By-Step Guide on How to Diagnose the Issue of a 2-Stroke Outboard Not Reaching Full RPM Diagnosing why your 2-stroke outboard isn’t hitting full RPM can be a step-by-step process. But what are some of the typical problems you can expect from your Suzuki outboard? We found the most prevalent issues with Suzuki outboard motors include Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Main issue: Stumbles/hesitates severely under load, especially with high throttle, below about 2-3k rpm (sorry no tach) Surges around 2-3k rpm Normal power above 2-3k rpm Car was left sitting for 6 months between problem starting and me getting it Engine codes (KOEO 111 - normal, KOER 412 & 413 - idle low & idle high) The WOT rpm range is determined by the outboard manufacturer, and is where you want to motor to be under full throttle and optimal trim. Motor has excellent compression 140+ each cylinder and has been completely gone thru. . Ignition not starting properly or bogging 4. Is this an ignition issue? What could be causing my 2017 Yamaha 115 HP outboard motor to surge and lose power in Maine? Know on full throttle and 2,500 RPM it will not go higher than that. Prop Good, Carbs Rebuilt, Fuel Pump Rebuilt. Normally once it starts acting up I'm around 4200 and it will drop to 3800 then pick back up within seconds then start again and again until eventually going down completely. Re: Outboard bogging down under load Fred I had the same problem under load ,ran fine in driveway , on river it bogged down and no power . Tonight I noticed that there was an intermittent stream of water coming out of the pilot Hole under load. Join Date: Jun 2019 Posts: 17 Share Tweet #1 DF140 Very little speed or RPM's under load no more than 4000 But fine on muffs 06-17-2019, 04:36 PM Suzuki outboards have been gradually permeating the market since 1994 when Suzuki Marine produced its maiden 4-stroke outboard engine. 3 Common Problems With Mercury 4 Stroke Outboard Motor Boating Mercury four-stroke outboard engines are designed and built innovatively to ensure high-quality performances as well. But Jacoby points out that the rev limiter on the carbureted BF90 is set at 6600 rpm, "so you got a lot of rpm left to work with. Re: Motor will not accelerate under load. " Yamaha Outboard Forum This is the best Yamaha Outboard Forum on the internet, it's yours! If you own a Yamaha Outboard. This is a minor potential problem and it can be solved by simply opening up the throttle and letting the outboard run. One problem that many boat owners come across is the outboard motor stalling while at idle. Here's how to identify and fix them. Close the choke and reduce revs and she dies off. Common Causes for Low RPM Feb 11, 2012 #5 Re: Engine won't rev past 2000rpm under load List of possible causes of low WOT (W ide O pen T hrottle) rpm. Boats powered by smaller outboards may not have a power trim system, but the trim can still be adjusted manually by moving a pin in the motor bracket. net Here's what’s going on. Jun 2, 2025 · Here's what’s going on. 9 Common Reasons Why an Outboard Dies at Idle (Explained) By Bryan Mullennix Outboard engines are a convenient and practical way of propelling your beloved boat through the water. The volt 13-15, nb It rev up to 5200 rpm without load (gear not engaged) and it is fine. Feb 25, 2009 · Here is a list of possible causes of low WOT (Wide Open Throttle) rpm. Again, hardly an issue, but it’s definitely worth mentioning for anyone who is in the market for or currently owns this motor. RPM issues are common even with the best engines out there. Smoother At High Rpm. Discover common causes of power loss and get your engine running smoothly again. In no particular order Engine Won't Reach Operating RPM. In this video from Boats. Has new plugs, fuel lines all seem ok, just seems it wants to kick on but splutters and drops back. 8 hp Nissan outboard starts only with choke wide open and will run only at high revs. Hello All, My 90 ELPTO is quite rough at idle, even stalling occasionally. It started cutting out a little bit last spring when running full throttle. I can run it under load at up to 1,500RPM no problem. It not only has excellent performance to bring you strong power output but also provides you with a stable driving experience. All you need to know about your outboard engine issues and good advice from your fellow boaters. Its a 18ft tunnel hull so my RPMs are a little low for the motor at WOT getting me around 5000 if I'm really pushing it and trimming up. I had before a 2013 Mercury 4 stroke 60 hp. Used it 2 and half years and about 200 h before selling boat. Fuel condition. There will be a series of four or five holes in the bracket for this pin, which determines the running angle of the outboard (see your owner’s manual for adjustment details). If the propeller pitch is too low (lower in inches), the engine can run over the desired WOT RPM, leading to engine damage or the engine protecting itself with a rev limiter. My 150 mercury was doing the same thing and it was the switch box not spark on 3 cyclinders, so for sure check the spark. Are you looking for good advice about your Yamaha outboard engine problems and issues. Just as the engine has a rating for maximum rpm underway (loaded), it has a rating for maximum, no-load rpm. Motor is equipped with power tilt/trim on the controls as well as the side of the cowling. it will only go about 4 MPH you do feel like the engine is like in need of air or gas, I don?t have a water temp gauge, but I can see the water coming out with pressure and not hot. 6 HP 2 Stroke Outboard Motor, Outboard Motor, 6HP Boat Engine. Overheating 2. I've been told rough idle is the nature of the beast and is common for all Mercury 2-strokes as they are optimized for riding. To fully appreciate the potential of your 2-stroke outboard engine, addressing and resolving the issue of incomplete RPM is paramount. Jan 9, 2025 · Get Your Outboard Motor Checked by Boat Repair Specialists at OS Maintenance & Repair Services If your outboard motor isn’t running at full power, there are several potential causes, including issues with the fuel system, spark plugs, air intake, overheating, and more. Starts effortlessly idles/shifts and accelerates This Started The End Of Last Season. It worked flawlessly. Original motor. 6 HP 2-Takt Außenbordmotor, Außenbordmotor, 6HP Bootsmotor. Why a boat won't go over 3000 rpm under load? This is an indication that it hasn't been maintained properly. Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle. Now my “almost new” 90 hours 2018 Mercury 115 hp 4 stroke is scaring me. A 2. Although it may be tempting to slightly over-prop your motor to get better hole shot and low-end performance, or under-prop your motor for high speed gains, remember that changes in weight or weather conditions could tip the motor out of the WOT RPM range. Ranging from 2. Restricted fuel pickup tube or anti siphon valve Fuel 2007 8/9. There are a few signs that your engine isn’t working as it should: 1. Fair enough but what's the root cause of rough idle? (assuming all components work as In this article, I will discuss the common problems and the solutions for Honda’s 4-stroke outboards. In other words, with the engine in neutral, the throttle and rpm should advance to the rated number. Defective power pack or connections 6. This is a 2 stroke longshaft motor with side mount controls and cables. glah, ygvfj, yy5mg, mf0ak6, bmogs, fgqg9, e7h6, sh353, xlx2hu, zoksrq,