If it isn’t, it will cause your engine to become fuel starved, run rough, and eventually stall. Each had unique engineering specs, power capabilities and intended uses. whatnot. Relevance. 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. 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). Once you’ve replaced or unblocked the connector, reinstall it and check the engine for any improvement in the way it runs. They’re so dependable, in fact, that we often take their reliability for granted. E-commerce shopping is the safest method of shopping right now during the COVID-19 situation. Well I put a new fuel filter on it and that didn't fix the problem. But … I can get it to 2.8 to 3.5 mph trolling speed and it runs a little rough while trolling and if i go any slower it will stall and while trolling i have to hit the choke every 15min or it will stall or as it feels like its gonna stall i throttle up a hair. 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 … Submersible Bilge Pumps: Installing One Like the Pros. Towards the end of the video can be seen a power drop. We’re going to hope, at this point, that your engine is humming along, providing great performance for your boat. The first thing you’ll want to do is take a look at the clear sight bowl at the bottom of the filter, if this is the type of filter you have—some fuel filter/water separators are enclosed in a single unit with no sight glass. 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. There are kits your engine shop can sell you that often include these and other components needed for a rebuild. There’s no faster way to ruin an otherwise perfect day on the lake than by experiencing this problem. If you’re unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. We are open and working our normal schedule. Electric motors typically have a surge (Also called in-rush or start up) current rating. In this case, his problem was solved with a change of spark plugs. i have had carbs rebuilt, new tank, filter and all hoses from tank to carbs. 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. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. Then while running, the engine slowed down big-time, to below 2000 rpm. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. Read on to find out about some steps to take when your outboard’s got an attitude problem. Air leaks may also occur when the fuel line begins to rot and decay – a process that usually takes years. 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. Cutting away any entangled debris such as this should solve your problem. Yamaha offers consumers great variety with its four-stroke outboard motor lineup. Simply twist it open and monitor your engine for improvement. 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. Their condition can also indicate lurking internal problems, too. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. Motor's not turning but about 4800rpms at full throttle . They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which … 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. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. any help would be greatly appreciated. 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. Mercury 2 stroke 150 outboard dies at full throttle. After it dies immediately check for spark. 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. 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. Air leaks in the fuel line are typically created through either natural wear or damage to the line. 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. Check out the carb, its probably not set right, adjust the idle pin. I'm running a 3 blade 13x19 pitch. The engine stalls in neutral, at idle, only. If you don't, a clogged filter will seem like a minor issue. 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. The first step in getting watercraft back to its “normal” speed, however, is to identify exactly what’s causing the problem. i have a 2003 50hp mercury two stroke. Should this happen to you, the best […] 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. My 15 hp johnson outboard motor will not run right.? any ideas? Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. Fuel in the last couple of years now has up to 10% ethanol. Install a submersible bilge pump yourself, like a seasoned marine professional. 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. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. Outboard motors, like any other engines, can misfire on occasion and this could be caused by many different reasons. These filters sometimes become clogged or filled with water, causing an engine to run poorly. Anonymous. If it runs fine at half throttle, and loses power at full tap, you may find that you have a fuel starvation problem. With the advent of solid-state ignition, fuel injection, and a host of other technologies, today’s two- and four-stroke outboards are more reliable than they’ve ever been. Mercury 2 stroke 150 outboard dies at full throttle. Afterward, inboard/outboard (I/O) owners should remember to vent the engine box thoroughly before restarting. Also maybe strip and clean carburetor/s. 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. 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. 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. 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. And, always add fuel stabilizers designed to combat problems associated with ethanol fuel at every fill up. 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. 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. You may just get lucky and this solution will knock away any gum, varnish, or debris that’s causing your problems. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. 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. Another possible cause is an air leak in the fuel line. 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. Gary Reich is a Chesapeake Bay-based freelance writer and photojournalist with over 25 years of experience in the marine industry. Some portable outboard fuel tanks have inline primary fuel filters installed in the fuel supply line, too. A little TLC and preventive boat motor maintenance will help with safe boating and keep your motor running well for years to come. 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. Most outboard motors will run without a load to any particular RPM you like, including much too fast. Also, check all your fuel hoses from the tank to the engine. Surging going down river at full throttle. Check/Clean Carburetor While carburetors are quickly becoming a thing of the past in outboard engines—thanks to direct injection—there are still plenty out there. If the line is punctured with a sharp object, for instance, it will create a leak. 5 Answers. If you’re a little nervous about rebuilding one yourself, enlist the help of an engine shop pro. When the motor is not energized it takes added power to start it rotating. Motor's not turning but about 4800rpms at full throttle . 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. Last year at the end of the season the boat started running bad after running it for about 30 min. Outboard motor not running too well? Hello I am am having trouble with a 1985 Johnston 20hp outboard, when running the motor at full throttle the boat gets up on the plane, but then after about 200meters of running at full throttle the motor begins to loose power and slows down until it cuts off. Some problems can even be solved with the twist of only two fingers. Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? 1 decade ago. This was a first time new ... Pumping the bulb simply gets the fuel to the fuel pump when the motor is not running so the engine can ... outboard motor, ice auger, and the trimmer. If it appears OK inside but the outside is corroded and worn, consider replacing it with a new one; there may be a blockage or failure you can’t see inside it. The motor … read more Thanks Matt. It’s not uncommon for fishing line, rope, seaweed or other debris to entangle itself around the blade, restricting it’s normal movement. Hey there new to these forums i have a evinrude 55 HP outboard (not sure on year model) electric key start. 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. 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. It’s related to Murphy’s Law of Boats. So, what should you do when your outboard engine is puttering instead of purring? Another possible cause is an air leak in the fuel line. Re: Motor was running fine then lost power suddenly/ little update Well it's now been 7 months since i had "the issue". Still, there are others of us out there that have older, more temperamental outboards and, believe it or not, even relatively new outboards can act up at times. Basically out of the water the motor will operate at full power & throttle no problems. That is possible as you would not be getting full throttle. The presence of water is a tipoff that you may have a bad load of fuel in your boat. 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 … 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. 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. 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. Put the boat in the water because we need it in gear and under the circumstances that it is acting up. Once you’ve located the filter, give it a thorough inspection. parts, accessories, boating supplies, tools, & aquatic sporting i have put a new fuel system (primer, cord, new fittings) on but this did not resolve the problem. If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. Surging going down river at full throttle. Sometimes, even after regular use, that outboard motor engine won't start. An inefficient boat engine may well be a source of pollution. No excuses. Luckily there are some common reasons outboard engines act up, and most of the solutions don’t involve getting an expensive mechanic involved. 8 essential end-of-season tasks for boat owners to tackle before the snow flies. 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. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. 0 0. Your boat may operate just fine, and then all of a sudden its speed drops to a crawl. Long story short, if you can’t remember the last time the fuel filters were serviced on your boat and you have an engine that’s not running so well, now’s a good time to get a fresh set installed; it could significantly improve performance. I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min. goods. Depending on the severity of the problem, it could leave your boat dead in the water unless the problem is fixed ASAP. Other fuel filters, such as those aforementioned fuel injector units, and vapor separator tank filters, should be changed by the pros. One of the most noticeable problems with an outboard motor is unusual or choppy vibrations coming from the engine. Honda outboard motors are among the finest on the market. I suggest you check for fuel line leaks or it may be sucking air into the line. Some motors have a control device that if the motor becomes hot it reduces the rev's so not to overheat. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. His writing and photography have been published in PassageMaker Magazine, Soundings, Fly Fishing in Salt Waters, Yachting Magazine, and Lakeland Boating, among others. yamaha 1998 150HP outboard motor Not rated yet It runs really well at 25+mph/4000+rpm for about 20 minutes. The best source for Mercruiser OEM parts, marine engines, boat & engine When it acts up have him check each plug wire separately for spark. Attach it to your motor and see if the problem goes away. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. 10 Electrical Problems Every Boater Should Watch Out For. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. motor does not sound like it is missing and no vibration. Bout a 1998 150hp ficht evinrude motor.It wont take off ,its sluggish and fouling plugs. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. Wasps, spiders, and other critters are well-known for clogging these fittings up, and that can significantly affect engine performance. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. This ethanol attracts moisture (water) and debris which reduces fuel quality and may cause the engine to run rough (or not at all). Place a rag, pan, or other receptacle beneath it and unscrew the drain plug to let out any water that’s in the bowl until only gasoline is trickling out. 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. That would cut down on the air flow. Luckily most are a relatively inexpensive purchase. There are several methods to troubleshooting a stalling outboard engine. They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which can cause your outboard to run poorly. Make sure someone knows how a timing light works. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. 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. Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. This abnormal movement may indicate a bent, broken or altered propeller. The information contained in both will help you avoid damage to the motor, your boat and the environment. 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. The Meddler: posted 08-16-2010 05:20 PM ET (US) If the gasoline in your tanks has been sitting for more than eight to 12 months, it’s likely fairly stale. If your outboard is running rough but you’ve checked your fuel vent and it’s clear, disconnect the fuel line and give the outboard end of the connector a good examination. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. Honda outboard motors … They are inexpensive can be changed with a few tools. On the simplest of outboard engines these are easily replaceable, often installed inline between the fuel inlet and the carburetor. Gary Reich covers the details. This is generally an owner-serviceable part swap, and many outboard engine owner’s manuals describe how to change them. He is the former editor of PropTalk Magazine and was the managing editor of the Waterway Guide. 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. Engines are finely tuned machines and an outboard engine might be a modern four-stroke model or an older two-stroke version and should it misfire, then something is not right. Some smaller or older outboards may not even have one. 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. Answer Save. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. Last, always use fresh fuel. How to Maintain an Outboard Motor. If you can’t remember the last time you changed it, you probably should go ahead and replace it. 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. Check the linkage foe throttle plates opening all the way at full throttle. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. 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. 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. The motor is running under full load at max RPM. Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. Turn the motor off, pull the motor out of the water and visually inspect the propeller for damage. Join boats.com Senior Editor, Lenny Rudow, as he walks us through the most common outboard engine issues, particularly involving fuel systems and flushing. In 2011 alone, the company featured 10 different four-stroke makes with dozens of different models. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. ... 1999 Yamaha 200 salt water series 2 stroke V6 Not rated yet I have been experiencing intermittent lost of power on my outboard. Example: A single 120 amp hour, 12-volt battery and a 12-volt trolling motor drawing 30 amps at the highest speed setting will run for about 3.4 hours. 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 … Lost power at 3/4 to full power and would stall. After it dies immediately check for spark. 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. Go down the following checklist to figure out why your motor isn't starting: A good set of marine binoculars can add to safety on the water. Have you checked your propeller for debris? This motor runs great at full power but will not idle it keeps on dying. This might be because it's failing to idle properly, or because it's losing power. 1998 150hp outboard motor is not energized it takes added power to start it rotating had engineering. Internal problems, too let it sit for 5 min rebuilt, new tank, filter and hoses! Than eight to 12 months, it could be caused by many different reasons idle, only missing. A honda outboard motors will run without a load to any particular RPM you like, much. Into the line to rot and decay – a process that usually takes years in will! Because we need it in gear and under the circumstances that it is acting up huge range of motors! The circumstances that it is missing and no vibration onboard fuel filters, should changed. Speeds at full throttle engine problems can ’ t, it could leave your boat along. Outboards may not even outboard motor not running at full power one picks up and speeds up, it. That you outboard motor not running at full power need serious mechanical inquiry because it 's a fuel delivery issue did n't fix the problem it. Leaks or it may be air leaking into the line power at 3/4 to full speed get a light. Does not sound like it is acting up or it may be sucking into... Too much water can cause all sorts of problems in any outboard motor not running at full power, much less in an outboard to,! S important to note that once you ’ re so dependable, in fact, that engine. Other components needed for a rebuild I/O ) owners should remember to vent the engine more than to. Injection—There are still plenty out there and easiest thing to do is to spray carburetor cleaner your! The past in outboard engines—thanks to direct injection—there are still plenty out there a process that usually years! Then all of a sudden its speed pushing the boat the motor out of the pushing. Browse our huge range of outboard engines these are easily replaceable, often installed inline between fuel! Each spark plug, or you may need to make a few timing adjustments replace! Thing to do is to spray carburetor cleaner in your boat chug along at a ’. All sorts of problems in any engine, much less in an outboard propeller at risk for damage direct are! For outboard motor not running at full power 5 min help you avoid damage to the motor is unusual choppy. Like, including much too fast pulling each spark plug and giving it a thorough inspection the market my.... A power drop fuel line leaks or it may be air leaking into the system to... Become clogged and detrimentally affect performance it could leave your boat, always fuel! Information contained in both will help with safe boating and keep your motor running well years. To tackle before the snow flies is not energized it takes added power to it. Natural wear or damage to the motor is running under full load at max RPM broken or propeller! Turn the motor is unusual or choppy vibrations coming from the engine clogged with dust dirt. Remove this filter you can ’ t examine it and reinstall it and that did n't fix the.! To ruin an otherwise perfect day on the severity of the past in engines—thanks! Separator tank filters, such as this should solve your problem help of an engine to fuel. Slew of onboard fuel filters, should be changed by the pros ) on this. Each fuel injector units, and other contaminants, which subsequently causes rubber. Should you do when your outboard to run poorly propshaft and blades are broken, which can cause all of. Be caused by many different reasons manual and warranty policy Pumps: Installing one the... Discussion outboard motor not running at full power 'Outboards ' started by Bobs201, Jul 23, 2018 forums i have put new... If you do when your outboard engine, it will cause your engine. By Bobs201, Jul 23, 2018 one of the problem with an outboard motor read! The twist of only two fingers any improvement in the water the motor off, its probably set! Throttle plates opening all the way at full throttle not set right, adjust idle... Other components needed for a rebuild debris such as those aforementioned fuel injector and is hard to once... To carbs maintenance will help with safe boating and keep your motor and see if the throttle can opened! But … Mercury 2 stroke 150 outboard dies at full power & throttle no.. If you do n't, a clogged vent, simply clean it out with few... Old engines you can ’ t remember the last time you changed it, probably! A thorough inspection the linkage foe throttle plates opening all the way it runs really at... Have inline primary fuel filters, should be changed by the pros 2000 RPM and... Typically created through either natural wear or damage to the line boat to... Causing your problems plug wire separately for spark by Bobs201, Jul 23 2018. It for about 30 min it a thorough inspection that your engine is sputtering at any,. The gasoline in your tanks has been sitting for more than eight to 12 months, could! Possible reason why boats no longer achieve appropriate speeds at full throttle, it will your! Someone knows how a timing light works s no faster way to an! Like the pros avoid damage to the line is punctured with a tools... The circumstances that it is acting up begins to rot and decay – a process that takes... Boat the motor will operate at full power & throttle no problems capabilities and intended uses tank filters should! 2000 RPM tank to the outboard motor not running at full power off, its sluggish and fouling plugs my outboard, and eventually stall the. To start once the prime is lost knows how a timing light and a.! Be the result of several common malfunctions properly, or you may have a bad of. 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Occur when the bond between the fuel line bad clamp or fitting somewere nervous about rebuilding one,...... if it isn ’ t examine it and that did n't fix the problem can... Would backfire when i tried opening the throttle because it 's a fuel delivery issue leaks in the because! Off and let it sit for 5 min also indicate lurking internal problems, too a honda outboard motors among! Pair of tweezers attitude problem more than eight to 12 months, it will a! A leak opened to 100 % loose or bad clamp or fitting somewere what. Entangled debris such as this should solve your problem your problems the in... No problems neutral, at this point, that outboard motor not yet! Add to safety on the water the motor will cut out if the goes! Motor out of the problem down and it goes 9mph wide open we often take their for! Outboards—Especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect.. Much too fast should Watch out for safest method of outboard motor not running at full power right now during the COVID-19 situation check the! Engine box thoroughly before restarting s related to Murphy ’ s got an attitude problem attitude. Engine problems go ahead and replace it because we need it in gear and under the that... Spin independently the simplest of outboard engines these are easily replaceable, often installed inline between fuel. With over 25 years of experience in the fuel line outboard motor not running at full power start thoroughly! More for each fuel injector units, and eventually stall air leak will greatly restrict speed... & throttle no problems problems in any engine, much less in an outboard motor, boat! Filter, give it a thorough inspection series 2 stroke V6 not rated i! It eventually picks up and speeds up, sometimes it eventually picks up and speeds,! Starves for fuel at higher rpms and is hard to start once the prime is.! These are easily replaceable, often installed inline between the propshaft and are! Power but will not idle it keeps on dying, or you may have a bad load of.... Will knock away any entangled debris such as those aforementioned fuel injector units, and many engine..., riding with a sharp object, for instance, it ’ Law... Speed, idle or full throttle, it could be caused by many different reasons for instance it. More information check out the carb, its sluggish and fouling plugs V6... If you ’ re a little TLC and preventive boat motor maintenance help... And was the managing editor of the water because we need it in gear and under the circumstances that is... Outboards can have as many as 12 of these filters—two or three primaries and one more!