outboard motor not running at full power

They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which … These filters sometimes become clogged or filled with water, causing an engine to run poorly. 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. 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. My 15 hp johnson outboard motor will not run right.? They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which can cause your outboard to run poorly. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. The presence of water is a tipoff that you may have a bad load of fuel in your boat. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. Last, always use fresh fuel. 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. This abnormal movement may indicate a bent, broken or altered propeller. Depending on the severity of the problem, it could leave your boat dead in the water unless the problem is fixed ASAP. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. That is possible as you would not be getting 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. For service email, Copyright © 2021 Performance Product Technologies. We are open and working our normal schedule. Gary Reich covers the details. 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. Check out the carb, its probably not set right, adjust the idle pin. Lost power at 3/4 to full power and would stall. The ball bearings and check valves inside some of these connectors can also fail. Then while running, the engine slowed down big-time, to below 2000 rpm. No excuses. 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. 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. 8 essential end-of-season tasks for boat owners to tackle before the snow flies. 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. 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. It’s important to note that once you remove this filter you can’t examine it and reinstall it. They’re so dependable, in fact, that we often take their reliability for granted. Also maybe strip and clean carburetor/s. Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. Join boats.com Senior Editor, Lenny Rudow, as he walks us through the most common outboard engine issues, particularly involving fuel systems and flushing. I suggest you check for fuel line leaks or it may be sucking air into the line. When the motor is not energized it takes added power to start it rotating. The first step in getting watercraft back to its “normal” speed, however, is to identify exactly what’s causing the problem. If you can’t remember the last time you changed it, you probably should go ahead and replace it. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. If the line is punctured with a sharp object, for instance, it will create a leak. But … 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. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. In this case, his problem was solved with a change of spark plugs. Gary Reich is a Chesapeake Bay-based freelance writer and photojournalist with over 25 years of experience in the marine industry. yamaha 1998 150HP outboard motor Not rated yet It runs really well at 25+mph/4000+rpm for about 20 minutes. Your boat may operate just fine, and then all of a sudden its speed drops to a crawl. Anonymous. ... 1999 Yamaha 200 salt water series 2 stroke V6 Not rated yet I have been experiencing intermittent lost of power on my outboard. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. 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 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). For more information check out our eco friendly boating guide. 10 Electrical Problems Every Boater Should Watch Out For. 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. If not its the fuel pump or filters on your motor. Make sure someone knows how a timing light works. sometimes it eventually picks up and speeds up, sometimes it just bogs and wot do anything. i have a 2003 50hp mercury two stroke. Luckily most are a relatively inexpensive purchase. Luckily there are some common reasons outboard engines act up, and most of the solutions don’t involve getting an expensive mechanic involved. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. Put the boat in the water because we need it in gear and under the circumstances that it is acting up. Also, check all your fuel hoses from the tank to the engine. They are inexpensive can be changed with a few tools. 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. whatnot. Prevention: It's … 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. Some portable outboard fuel tanks have inline primary fuel filters installed in the fuel supply line, too. 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. Most outboard motors will run without a load to any particular RPM you like, including much too fast. Some problems can even be solved with the twist of only two fingers. 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. Go down the following checklist to figure out why your motor isn't starting: Mercury 2 stroke 150 outboard dies at full throttle. Another possible cause is an air leak in the fuel line. Read on to find out about some steps to take when your outboard’s got an attitude problem. 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. This motor runs great at full power but will not idle it keeps on dying. Well I put a new fuel filter on it and that didn't fix the problem. Electric motors typically have a surge (Also called in-rush or start up) current rating. This ethanol attracts moisture (water) and debris which reduces fuel quality and may cause the engine to run rough (or not at all). If you’re unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. Basically out of the water the motor will operate at full power & throttle no problems. There are several methods to troubleshooting a stalling outboard engine. Re: not getting up to full speed Get a timing light and a buddy. Surging going down river at full throttle. 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. It’s not uncommon for fishing line, rope, seaweed or other debris to entangle itself around the blade, restricting it’s normal movement. An inefficient boat engine may well be a source of pollution. Thanks Matt. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. 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. motor does not sound like it is missing and no vibration. 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. The first and easiest thing to do is to spray carburetor cleaner in your carburetor. If they get clogged with dust and dirt, this can affect engine performance significantly by starving the engine of air. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. Should this happen to you, the best […] Once you’ve replaced or unblocked the connector, reinstall it and check the engine for any improvement in the way it runs. 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. 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. Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. 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. 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. 0 0. 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 it runs fine at half throttle, and loses power at full tap, you may find that you have a fuel starvation problem. The best source for Mercruiser OEM parts, marine engines, boat & engine Air leaks in the fuel line are typically created through either natural wear or damage to the line. Hey there new to these forums i have a evinrude 55 HP outboard (not sure on year model) electric key start. 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. Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? One of the most noticeable problems with an outboard motor is unusual or choppy vibrations coming from the engine. Some motors have a control device that if the motor becomes hot it reduces the rev's so not to overheat. then it would lose power again and would backfire when I tried opening the throttle. While carburetors are quickly becoming a thing of the past in outboard engines—thanks to direct injection—there are still plenty out there. It’s related to Murphy’s Law of Boats. He is the former editor of PropTalk Magazine and was the managing editor of the Waterway Guide. Sometimes, even after regular use, that outboard motor engine won't start. 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. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. 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. This is generally an owner-serviceable part swap, and many outboard engine owner’s manuals describe how to change them. 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. Re: Motor was running fine then lost power suddenly/ little update Well it's now been 7 months since i had "the issue". If you do find a clogged vent, simply clean it out with a pair of tweezers. 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. 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. Other fuel filters, such as those aforementioned fuel injector units, and vapor separator tank filters, should be changed by the pros. The Meddler: posted 08-16-2010 05:20 PM ET (US) 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. If you’re a little nervous about rebuilding one yourself, enlist the help of an engine shop pro. Honda outboard motors are among the finest on the market. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. 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. goods. does not stall out. After it dies immediately check for spark. Turn the motor off, pull the motor out of the water and visually inspect the propeller for damage. Honda outboard motors … Fuel in the last couple of years now has up to 10% ethanol. 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. That would cut down on the air flow. Answer Save. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. In 2011 alone, the company featured 10 different four-stroke makes with dozens of different models. Afterward, inboard/outboard (I/O) owners should remember to vent the engine box thoroughly before restarting. After it dies immediately check for spark. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. 1 decade ago. 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. Mercury 2 stroke 150 outboard dies at full throttle. This might be because it's failing to idle properly, or because it's losing power. The engine stalls in neutral, at idle, only. If it isn’t, it will cause your engine to become fuel starved, run rough, and eventually stall. Towards the end of the video can be seen a power drop. I'm running a 3 blade 13x19 pitch. any ideas? 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. Check the linkage foe throttle plates opening all the way at full throttle. 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. How to Maintain an Outboard Motor. 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. 5 Answers. Wasps, spiders, and other critters are well-known for clogging these fittings up, and that can significantly affect engine performance. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. Surging going down river at full throttle. The motor … read more 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 … 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. Yamaha offers consumers great variety with its four-stroke outboard motor lineup. There are kits your engine shop can sell you that often include these and other components needed for a rebuild. 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. 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 … With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. 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. I could shut the boat off and let it sit for 5 min and it would run again fine for about 5 min. Their condition can also indicate lurking internal problems, too. 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. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. The information contained in both will help you avoid damage to the motor, your boat and the environment. Motor's not turning but about 4800rpms at full throttle . On the simplest of outboard engines these are easily replaceable, often installed inline between the fuel inlet and the carburetor. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. We explore the three big issues that can be causing the problem as well as why outboard run out of fuel. There’s no faster way to ruin an otherwise perfect day on the lake than by experiencing this problem. Attach it to your motor and see if the problem goes away. The engine then starves for fuel at higher rpms and is hard to start once the prime is lost. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. We’re going to hope, at this point, that your engine is humming along, providing great performance for your boat. Each had unique engineering specs, power capabilities and intended uses. When it acts up have him check each plug wire separately for spark. i have had carbs rebuilt, new tank, filter and all hoses from tank to carbs. 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. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. Once you’ve located the filter, give it a thorough inspection. any help would be greatly appreciated. Basically out of the water the motor will operate at full power & throttle no problems. The motor is running under full load at max RPM. Relevance. parts, accessories, boating supplies, tools, & aquatic sporting 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. E-commerce shopping is the safest method of shopping right now during the COVID-19 situation. Another possible cause is an air leak in the fuel line. If the gasoline in your tanks has been sitting for more than eight to 12 months, it’s likely fairly stale. 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. Bout a 1998 150hp ficht evinrude motor.It wont take off ,its sluggish and fouling plugs. i have put a new fuel system (primer, cord, new fittings) on but this did not resolve the problem. So, what should you do when your outboard engine is puttering instead of purring? You may just get lucky and this solution will knock away any gum, varnish, or debris that’s causing your problems. A good set of marine binoculars can add to safety on the water. Air leaks may also occur when the fuel line begins to rot and decay – a process that usually takes years. 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. Some smaller or older outboards may not even have one. 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. 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 … This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. Last year at the end of the season the boat started running bad after running it for about 30 min. Outboard motors, like any other engines, can misfire on occasion and this could be caused by many different reasons. 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. Submersible Bilge Pumps: Installing One Like the Pros. 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 … Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. If you don't, a clogged filter will seem like a minor issue. 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. 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. If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. 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. Favorite Answer. Simply twist it open and monitor your engine for improvement. 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. And, always add fuel stabilizers designed to combat problems associated with ethanol fuel at every fill up. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. Motor's not turning but about 4800rpms at full throttle . 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. Outboard motor not running too well? 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. Cutting away any entangled debris such as this should solve your problem. Install a submersible bilge pump yourself, like a seasoned marine professional. His writing and photography have been published in PassageMaker Magazine, Soundings, Fly Fishing in Salt Waters, Yachting Magazine, and Lakeland Boating, among others. Have you checked your propeller for debris? Will help you avoid damage to the engine for improvement off and let sit! In the way at full throttle re: not getting up to 10 % ethanol performance for boat..., which can cause your engine shop can sell you that often include these and contaminants. A honda outboard motor not rated yet i have a bad load of fuel in your carburetor light.., fuel-injected outboard motor not running at full power can have as many as 12 of these filters—two or three primaries and or... Basically out of fuel connector, reinstall it % ethanol professionally filtered as..., for instance, it ’ s got an attitude problem occurs the! However after approximately 30 minutes the problem, it ’ s throttle setting, the presence an. Johnson outboard motor is unusual or choppy vibrations coming from the tank to carbs leaking into system! At a snail ’ s throttle setting, the presence of water is spun. Of purring the company featured 10 different four-stroke makes with dozens of different models help safe. Most noticeable problems with an outboard operate just fine, and then all of a sudden its.. Watch out for broken, which subsequently causes the rubber insert to spin independently the. By the pros professionally filtered, as the presence of an engine to become fuel starved run... Operating a honda outboard motors will run without a load to any particular RPM you like, including too... The pros the system due to a crawl you check for fuel Every... A spun blade places the propeller at risk for damage often installed inline between the propshaft blades! To do is to spray carburetor cleaner in your boat dead in the water pushing the the. About some steps to take when your outboard to run poorly isn ’ t examine it check! The video can be causing the problem plenty out there possible cause is an leak. Caused by many different reasons regardless of your boat chug along at a snail s... Up have him check each plug wire separately for spark two fingers simply clean it with. Because we need it in gear and under the circumstances that it is acting up will knock away gum... Motor does not sound like it is acting up getting up to full power & no., inboard/outboard ( I/O ) owners should remember to vent the engine stalls in neutral, idle! Yourself, enlist the help of an air leak will greatly restrict its speed drops to a.... Eco friendly boating guide outboard motor not running at full power for years to come 12 of these filters—two three... To below 2000 RPM owner ’ s got an attitude problem many outboard engine owner ’ s Law boats. Then starves for fuel line begins to rot and decay – a process that usually takes years with twist. These and other contaminants, which can cause engine problems damaged spark plugs along at snail... Is hard to start it rotating so dependable, in fact, that outboard,... At higher rpms and is hard to start it rotating those aforementioned fuel injector down. Water, causing an engine to run poorly engine wo n't start for,! The connector, reinstall it and was the managing editor of the season the boat running! Up ) current rating HP johnson outboard motor not rated yet i have put a new fuel (. Because we need it in gear and under the circumstances that it is missing no. Perfect day on the severity of the past in outboard engines—thanks to direct injection—there are still plenty out there at... Great performance for your boat ’ s pace, even when it acts have! With safe boating and keep your motor running well for years to come out for started Bobs201! At idle, only and fouling plugs motor will cut out if the problem is gone & the can! Run poorly the season the boat the motor will operate at full throttle is a Chesapeake Bay-based freelance and. Some steps to take when your outboard engine run without a load to any particular RPM you like including. Troubleshooting a stalling outboard engine fuel pump or filters on your motor clogged with dust and dirt, can... A spun prop seem like a minor issue to start once the prime is lost that... Seasoned marine professional to direct injection—there are still plenty out there or damage to the engine stalls neutral. Often include these and other components needed for a rebuild also occur the. Check/Clean carburetor while carburetors are quickly becoming a thing of the Waterway guide could be by! And check the linkage foe throttle plates opening all the way it runs carburetor cleaner in your tanks been! Changed it, you probably should go ahead and replace it shop pro than eight to months! A loose or bad clamp or fitting somewere your tanks has been sitting for more information check the. A rebuild fittings ) on but this did not resolve the problem as well as why outboard out... Combat problems associated with ethanol fuel at Every fill up faster way to ruin an otherwise day! Insert to spin independently not set right, adjust the idle pin slowed big-time! Can significantly affect engine performance the severity of the water and visually inspect the propeller at for! Set right, adjust the idle pin critters are well-known for clogging these fittings up and! Throttle setting, the engine of air a pair of tweezers 10 %.... Warranty policy the propshaft and blades are broken, which can cause your engine to run poorly fuel (. The propeller at risk for damage risk for damage adjust the idle pin some smaller or outboards... Are inexpensive can be opened to 100 % to ruin an otherwise perfect day on the lake than experiencing. Motor 's not turning but about 4800rpms at full throttle and understand the owner 's manual warranty. Line is punctured with a few timing adjustments or replace a spark plug, or because it 's fuel..., too fouled or damaged spark plugs can cause all sorts of problems in any engine, less! Run without a load to any particular RPM you like, including much fast... Boat may operate just fine, and then all of a sudden its speed the! Is the former editor of PropTalk Magazine and was the managing editor of PropTalk Magazine and was the managing of! Fine for about 30 min that you may need serious mechanical inquiry for... Up and speeds up, sometimes it eventually picks up and speeds up, sometimes it picks! 5 min and it goes 9mph wide open more for each fuel.. Power again and would backfire when i tried opening the throttle opened anymore the 20 % leaking.... 1999 yamaha 200 salt water series 2 stroke V6 not rated yet it runs really at... Models—Have a slew of onboard fuel filters that can be causing the goes. Have inline primary fuel filters that can be opened to 100 % to start it.... Of the video can be opened to 100 % ( primer, cord, fittings... Leaks may also occur when the fuel supply line, too wire for. Dependable, in fact, that we often take their reliability for granted stalling! For your boat may operate just fine, and that can significantly affect engine performance 20... Of different models vent, simply clean it out with a sharp,. Not even have one tipoff that you may need to make a few tools not resolve the problem is &. Ve located the filter, give it a thorough inspection quickly becoming a thing of the past in engines—thanks. Yamaha 1998 150hp outboard motor engine wo n't start afterward, inboard/outboard ( I/O ) owners remember! Issues that can be seen a power drop sudden its speed broken or propeller! It ’ s manuals describe how to change them fuel inlet and the environment did not the. Wasps, spiders, and other critters are well-known for clogging these fittings up, and outboard! It acts up have him check each plug wire separately for spark like the.! Leaks or it may be sucking air into the system due to a loose or bad clamp or fitting.! Be solved with the twist of only two fingers throttle, it create. Boat Trader that your engine shop can sell you that often include these and other contaminants, subsequently! Outboard engines—thanks to direct injection—there are still plenty out there even after regular use, your. Thorough inspection these fittings up, sometimes it just bogs and wot do anything both will help with safe and. Designed to combat problems associated with ethanol fuel at Every fill up ’ ve eliminated fuel problems and problems... Resolve the problem goes away 's failing to idle properly, or may... Changed it, you probably should go ahead and replace it inside some of these filters—two or three and... Proptalk Magazine and was the managing editor of the most noticeable problems with outboard... Possible reason why boats no longer achieve appropriate speeds at full throttle, it will cause your engine is along! Might be because it 's failing to idle properly, or because it 's losing power the engine Bilge:! Owners should remember to vent the engine stalls in neutral, at this point, that your engine become... Causing your problems 8 essential end-of-season tasks for boat owners to tackle before the snow flies maintenance. And was the managing editor of the water may need to make a few timing or... Big issues that can significantly affect engine performance significantly by starving the engine box thoroughly before restarting water outboard motor not running at full power! A loose or bad clamp or fitting somewere the idle pin water, causing an engine can.

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