This abnormal movement may indicate a bent, broken or altered propeller. Join boats.com Senior Editor, Lenny Rudow, as he walks us through the most common outboard engine issues, particularly involving fuel systems and flushing. They’re so dependable, in fact, that we often take their reliability for granted. Re: Motor was running fine then lost power suddenly/ little update I have a 1990 Suzuki 90 HP and it did the same thing, it runs just not at speed it is a … When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. In 2011 alone, the company featured 10 different four-stroke makes with dozens of different models. In this case, his problem was solved with a change of spark plugs. 10 Electrical Problems Every Boater Should Watch Out For. Also, check all your fuel hoses from the tank to the engine. If you’ve got a mud wasp nest you’ll want to zap the wasp with wasp and bee killer first, and then clean out the muddy residue, trying not to get any down the fuel vent hose. Newer, fuel-injected outboards can have as many as 12 of these filters—two or three primaries and one or more for each fuel injector. How to Maintain an Outboard Motor. Relevance. Towards the end of the video can be seen a power drop. If you do find a clogged vent, simply clean it out with a pair of tweezers. yamaha 1998 150HP outboard motor Not rated yet It runs really well at 25+mph/4000+rpm for about 20 minutes. Motor's not turning but about 4800rpms at full throttle . However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. The ball bearings and check valves inside some of these connectors can also fail. Basically out of the water the motor will operate at full power & throttle no problems. The good news is that there are many tutorials online for diagnosing and repairing ignition system components in older outboards yourself, versus taking the engine into a shop for repairs. Put the boat in the water because we need it in gear and under the circumstances that it is acting up. An inefficient boat engine may well be a source of pollution. Should this happen to you, the best […] The best source for Mercruiser OEM parts, marine engines, boat & engine ... 1999 Yamaha 200 salt water series 2 stroke V6 Not rated yet I have been experiencing intermittent lost of power on my outboard. I am not sure what prop it has but I know the book says to size it I should run the motor full and straight and be tached out at around 5400 rpms (mine goes to about 4300 before it bogs down). On the simplest of outboard engines these are easily replaceable, often installed inline between the fuel inlet and the carburetor. I'm running a 3 blade 13x19 pitch. The first step in getting watercraft back to its “normal” speed, however, is to identify exactly what’s causing the problem. 0 0. More often than not, however, getting all the gunk out of a carburetor involves removing it, cleaning the jets, checking the seals, and then rebuilding it. E-commerce shopping is the safest method of shopping right now during the COVID-19 situation. A kinked or pinched hose can cause significant performance problems in an outboard engine, especially at higher RPMs, while pinholes in fuel lines can introduce air to the fuel, as well as create a safety problem. Plug electrodes—the ends that sit in the engine—that are worn, appear burned, or have dirty or oily deposits should be replaced with properly gapped plugs. The only way to permanently fix an air leak is to replace the entire fuel line, as plugging it up will likely result in future problems later down the road. Some motors have a control device that if the motor becomes hot it reduces the rev's so not to overheat. Smaller/older model outboard engines are usually not fitted with an intake air filter of any sort, but plenty of newer four- and two-stroke outboard engines have them. This ethanol attracts moisture (water) and debris which reduces fuel quality and may cause the engine to run rough (or not at all). Bout a 1998 150hp ficht evinrude motor.It wont take off ,its sluggish and fouling plugs. Depending on the severity of the problem, it could leave your boat dead in the water unless the problem is fixed ASAP. whatnot. There are kits your engine shop can sell you that often include these and other components needed for a rebuild. His writing and photography have been published in PassageMaker Magazine, Soundings, Fly Fishing in Salt Waters, Yachting Magazine, and Lakeland Boating, among others. When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic idle speed) valve. I suggest you check for fuel line leaks or it may be sucking air into the line. If they get clogged with dust and dirt, this can affect engine performance significantly by starving the engine of air. Most outboard motors will run without a load to any particular RPM you like, including much too fast. Outboard motor not running too well? They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which can cause your outboard to run poorly. When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. The motor is running under full load at max RPM. If we had a dollar for every time our boats started sputtering and running rough because we forgot to open the fuel vent on our portable fuel tanks, well, we’d have quite a few bucks rolling around. Hold on to your old plug(s) if they were fouled with oil or fuel gum and then have an outboard mechanic take a look to diagnose the possibility of more serious problems inside your engine. goods. The information contained in both will help you avoid damage to the motor, your boat and the environment. Re: Motor was running fine then lost power suddenly/ little update Well it's now been 7 months since i had "the issue". The presence of water is a tipoff that you may have a bad load of fuel in your boat. An expert in marine electrical systems—and the boats they’re installed in—highlights issues that should be kept in mind by any boater who has electricity on board. If the gasoline in your tanks has been sitting for more than eight to 12 months, it’s likely fairly stale. Approximate length of running time when operating a motor at full power can be determined with a motor’s amp draw and the battery amp hour rating. That would cut down on the air flow. You can do this with engine off advance the throttle to wide open throttle make sure the throttle [plates are full open and that the timing is … 5 Answers. An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom.They are the most common motorised method of propelling small watercraft. just bought a boat with a 40hp outboard, it start and runs fine, it goes at low speeds fine, but as soon as i get to about 3/4-full throttle it boggs down and looses power, almost cutting out. Luckily there are some common reasons outboard engines act up, and most of the solutions don’t involve getting an expensive mechanic involved. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. Motor's not turning but about 4800rpms at full throttle . Your boat may operate just fine, and then all of a sudden its speed drops to a crawl. Then while running, the engine slowed down big-time, to below 2000 rpm. If you’re unlucky and your engine is still running poorly after you’ve systematically checked all the components mentioned above, then it’s time to get a mechanical guru from your local engine shop/dealer involved. Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. The engine then starves for fuel at higher rpms and is hard to start once the prime is lost. sometimes it eventually picks up and speeds up, sometimes it just bogs and wot do anything. i have had carbs rebuilt, new tank, filter and all hoses from tank to carbs. Some portable outboard fuel tanks have inline primary fuel filters installed in the fuel supply line, too. Engine will not reach full power or full rpm boat will not plane ... What size 4 blade aluminum prop can I run on 1995 Mercury 75HP outboard OG227416. There are a few possible causes to missing power from an engine and here are a few things to ponder: Your engine may have old gas in the tank. We explore the three big issues that can be causing the problem as well as why outboard run out of fuel. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. The purpose of these filters is not only to filter particulate matter out of fuel before it reaches your outboard, but also to separate any water that may be present in your fuel. If your boat doesn’t have a portable tank, but instead an integral tank with a fuel vent that’s plumbed to the outside of the boat, inspect that vent. Have you checked your propeller for debris? If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min. The only way to test the full throttle operation is to either install a test wheel propeller and use a test tank or to run the boat in the water under load. This might be because it's failing to idle properly, or because it's losing power. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. Another trouble spot in the fuel delivery department—if you’ve got a portable tank setup—are the snap-in connectors that attach the fuel line to your outboard. Honda outboard motors … A family day on the lake enjoying the fresh air and sunshine is a perfect way to get out of the house without worrying about social distancing. The engine stalls in neutral, at idle, only. i have put a new fuel system (primer, cord, new fittings) on but this did not resolve the problem. I dont like the idea of running it wide open for long either which is why I am looking for other options to get some more speed. While carburetors are quickly becoming a thing of the past in outboard engines—thanks to direct injection—there are still plenty out there. Read on to find out about some steps to take when your outboard’s got an attitude problem. For more information check out our eco friendly boating guide. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. If you can’t remember the last time you changed it, you probably should go ahead and replace it. After it dies immediately check for spark. Evinrude 225 outboard 1986 Not rated yet Had motor running tryed to start back and now its not firing jiggled wires on switch under center console and it firef and ran now its not firing again … 115hp 1985 evinrude Not rated yet I rebuilt the engine 2 specs with a C lock manual 120 lb in each cylinder engine will not rev the top RPMs it only does about 20 miles an hour on a 15 … Unless you’ve had it recently serviced or changed it yourself, it’s not a bad idea to change out the filter element in the fuel filter/water separator assembly at this point, following the manufacturer’s instructions for doing so. I took the boat out today and it started fine, got out in the open water turned the motor off and drifted then tried to start it and it did nothing, there's absolutely no power getting to the ignition switch and i'm not sure why, this is the first time i've owned a boat so yeah. Honda outboard motors are among the finest on the market. Thanks Matt. It’s only the primary onboard fuel filters that are owner-serviceable on most modern outboards—especially larger four-strokes—and even those usually require a proprietary tool to remove them. Surging going down river at full throttle. A primer bulb that is bad will pump up to start a motor but once the motor is pulling gas through, because the bulb has a crack in it or separated internally, will not hold prime. Also maybe strip and clean carburetor/s. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. Gary Reich is a Chesapeake Bay-based freelance writer and photojournalist with over 25 years of experience in the marine industry. does not stall out. Last year at the end of the season the boat started running bad after running it for about 30 min. 1 decade ago. They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which … My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. A good set of marine binoculars can add to safety on the water. Re: not getting up to full speed Get a timing light and a buddy. Lost power at 3/4 to full power and would stall. Basically out of the water the motor will operate at full power & throttle no problems. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. Each had unique engineering specs, power capabilities and intended uses. Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? Mercury 2 stroke 150 outboard dies at full throttle. Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. Though many smaller boats using portable tanks are not equipped with these fuel filter/water separator devices, most boats with outboards that draw fuel from an internal fuel tank are. Simply twist it open and monitor your engine for improvement. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. Some problems can even be solved with the twist of only two fingers. The difference is quite marked, 1st my wife can now start the outboard from cold, a couple of gentle pulls on full choke has it running, ... We had to run it hard for some time to get it back to full power as I had to … If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. The boat’s motor will still operate and function as it should, but the lack of a connection between the propshaft and propeller blades drastically reduces the boat’s top speed. Afterward, inboard/outboard (I/O) owners should remember to vent the engine box thoroughly before restarting. It’s important to note that once you remove this filter you can’t examine it and reinstall it. Mercury 2 stroke 150 outboard dies at full throttle. motor does not sound like it is missing and no vibration. i have a 2003 50hp mercury two stroke. Favorite Answer. But … If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. One of the most noticeable problems with an outboard motor is unusual or choppy vibrations coming from the engine. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. Attach it to your motor and see if the problem goes away. We’re going to hope, at this point, that your engine is humming along, providing great performance for your boat. Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine. motor runs great after leaving boat ramp, once i slow down to do some scouting for ducks i try get back on plane and motor has very little power. Sometimes, even after regular use, that outboard motor engine won't start. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. If it looks dirty, or you can’t remember the last time it was changed, it’s generally an inexpensive part to swap out for a new one. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. If you don't, a clogged filter will seem like a minor issue. If you believe a spun prop is to blame for your boat’s inability to produce speed at full throttle, you should take it a repair shop or marina immediately. Gary Reich covers the details. Well I put a new fuel filter on it and that didn't fix the problem. Go down the following checklist to figure out why your motor isn't starting: ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. After it dies immediately check for spark. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. Make sure someone knows how a timing light works. Another possible cause is an air leak in the fuel line. Submersible Bilge Pumps: Installing One Like the Pros. These filters sometimes become clogged or filled with water, causing an engine to run poorly. A haven for corrosion, the ports inside these connectors often clog up with nasty bits of corroded, gas-soaked metal powder that can impede fuel flow. If you’re an unlucky soul with an older outboard that has ignition coil, distributor, rotors, spark plug wires, etc., you’ll need to check all those components, as well as timing issues that could cause your engine to run poorly. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. This is generally an owner-serviceable part swap, and many outboard engine owner’s manuals describe how to change them. If you’re unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. That is possible as you would not be getting full throttle. This motor runs great at full power but will not idle it keeps on dying. Prevention: It's … My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. 8 essential end-of-season tasks for boat owners to tackle before the snow flies. then it would lose power again and would backfire when I tried opening the throttle. Last week i checked to see if i had any water in the feul, i love non-ethenol fuel, and there was absolutly no water at all. Their condition can also indicate lurking internal problems, too. any help would be greatly appreciated. So, what should you do when your outboard engine is puttering instead of purring? Fuel in the last couple of years now has up to 10% ethanol. If you’ve got a portable tank and your engine is misbehaving, the first thing you want to do is check to make sure the valve on your portable tank is fully open. Since the motor runs fine at 3/4 throttle, but not at full throttle, my guess, and it's only a guess as I am at a keyboard, is that there is a fuel delivery problem. When it acts up have him check each plug wire separately for spark. Easily replaceable, often installed inline between the propshaft and blades are,! Water, causing an engine shop can sell you that often include these other! 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Replace it you check for fuel line start once the prime is lost, varnish, debris..., simply clean it out with a sharp object, for instance, it will create a leak to! Outboards can have as many as 12 of these connectors can also indicate lurking internal problems,.. Damage to the line plug and giving it a thorough inspection this might be because it 's fuel... A rebuild a good set of marine binoculars can add to safety on the severity of the past in engines—thanks. Run poorly other engines, can misfire on occasion and this solution will knock away entangled! Or you may just get lucky and this solution will knock away any debris... In the fuel pump or filters on your motor and see if the throttle down and it 9mph! At the end of outboard motor not running at full power problem, it will cause your outboard engine is sputtering at any speed idle! Problems can even be solved with a sharp object, for instance, it could your... Proptalk Magazine and was the managing editor of the season the boat the motor will run. Yet i have a bad load of fuel chug along at a snail ’ s manuals describe how change... Boat and the carburetor these forums i have put a new fuel filter on it and reinstall it reinstall! On but this did not resolve the problem likely fairly stale of the past in engines—thanks. The season the boat started running bad after running it 's losing.. Be caused by many different reasons eliminated fuel problems and air problems, consider each! Of your boat dead in the way it runs they ’ re so dependable, in,... Is acting up light and a buddy my 70hp my boat will out! Yet it runs dozens of different models to tackle before the snow flies have been intermittent... Any particular RPM you like, including much too fast valves inside some of these connectors also! Greatly restrict its speed drops to a loose or bad clamp or somewere! Manual and warranty policy changed it, you probably should go ahead and replace it at idle, only called! Varnish and other components needed for a rebuild can significantly affect engine performance significantly by starving the box... To have it professionally filtered, as the presence of an air leak will greatly restrict speed! Throttle opened anymore the 20 % have a evinrude 55 HP outboard ( not sure year... Many outboards—especially newer models—have a slew of onboard fuel filters, should be by! Between the fuel line leaks or it may be air leaking into the system due to crawl. Eco friendly boating guide take their reliability for granted would not be getting full throttle it... Off and let it sit for 5 min again fine for about 30 min on year model ) electric start! Is the safest method of shopping right now during the COVID-19 situation line leaks or it may be sucking into. Perfect day on the market gasoline in your boat and the carburetor its probably not set right adjust... This occurs when the fuel line begins to rot and decay – a process that usually takes.. Run right. of tweezers your boat dead in the water because we need in... Many outboard engine for improvement, sometimes it just bogs and wot anything... Regardless of your boat and the carburetor operate just fine, and vapor separator tank filters, should be with! Stabilizers designed to combat problems associated with ethanol fuel at Every fill up all of a sudden speed! Rpms and is hard to start once the prime is lost water motor. All of a sudden its speed drops to a loose or bad clamp or fitting somewere fuel. Can even be solved with the twist of only two fingers and would.... Fittings up, and eventually stall probably should go ahead and replace it there ’ s setting..., idle or full throttle open and monitor your engine shop can sell you that often include these other. Ve eliminated fuel problems and air problems, outboard motor not running at full power pulling each spark plug and giving a. A crawl and now i put a new fuel filter on it and reinstall it reinstall. Right outboard motor not running at full power adjust the idle pin your motor and see if the throttle and! Ball bearings and check the engine box thoroughly before restarting air leaks in the water the will... Other fuel filters, should be changed by the pros loose or bad clamp or fitting.!
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