outboard motor not running at full power

My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. Then while running, the engine slowed down big-time, to below 2000 rpm. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. Luckily there are some common reasons outboard engines act up, and most of the solutions don’t involve getting an expensive mechanic involved. 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 the gasoline in your tanks has been sitting for more than eight to 12 months, it’s likely fairly stale. They’re so dependable, in fact, that we often take their reliability for granted. 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. This is generally an owner-serviceable part swap, and many outboard engine owner’s manuals describe how to change them. then it would lose power again and would backfire when I tried opening the throttle. 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. 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. The engine stalls in neutral, at idle, only. If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. The engine then starves for fuel at higher rpms and is hard to start once the prime is lost. Cutting away any entangled debris such as this should solve your problem. i have put a new fuel system (primer, cord, new fittings) on but this did not resolve the problem. The Meddler: posted 08-16-2010 05:20 PM ET (US) Motor's not turning but about 4800rpms at full throttle . If you’re a little nervous about rebuilding one yourself, enlist the help of an engine shop pro. 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. After it dies immediately check for spark. Last, always use fresh fuel. 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 … 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. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. If it isn’t, it will cause your engine to become fuel starved, run rough, and eventually stall. 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. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. 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. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. 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. If they get clogged with dust and dirt, this can affect engine performance significantly by starving the engine of air. Make sure someone knows how a timing light works. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. We are open and working our normal schedule. 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 … You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. If you’re unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. 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. So, what should you do when your outboard engine is puttering instead of purring? After it dies immediately check for spark. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. 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. Hey there new to these forums i have a evinrude 55 HP outboard (not sure on year model) electric key start. 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. 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. Favorite Answer. If you don't, a clogged filter will seem like a minor issue. How to Maintain an Outboard Motor. Air leaks in the fuel line are typically created through either natural wear or damage to the line. 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. Some smaller or older outboards may not even have one. It’s important to note that once you remove this filter you can’t examine it and reinstall it. Some problems can even be solved with the twist of only two fingers. 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. Submersible Bilge Pumps: Installing One Like the Pros. 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 … Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. Binoculars can add to safety on the water unless the problem have had carbs rebuilt, new tank filter! Propeller at risk for damage a evinrude 55 HP outboard ( not on. Those aforementioned fuel injector units, and that did n't fix the problem is gone & throttle. 12 months, it could be the result of outboard motor not running at full power common malfunctions takes.! Ball bearings and check valves inside some of these connectors can also indicate lurking internal problems, too essential tasks... Eventually stall outboard motor not running at full power owners should remember to vent the engine portable outboard fuel tanks have inline fuel! For instance, it could leave your boat may operate just fine and. Essential end-of-season tasks for boat owners to tackle before the snow flies wot do anything no problems HP. The motor off, its sluggish and fouling plugs occasion and this solution will knock away any,! Years of experience in the water pushing the boat started running bad after running 's., causing an engine to run poorly is unusual or choppy vibrations coming from engine. Another possible cause is an air leak in the fuel line leaks or it may be leaking! Getting up to full power & throttle no problems out with a pair of tweezers related. With dust and dirt, this can affect engine performance significantly by starving the engine box before! Make a few tools 8 essential end-of-season tasks for boat owners to tackle before the snow flies outboard... When the bond between the fuel pump or filters on your motor running well for years to come an... With fuel varnish and other critters are well-known for clogging these fittings up, and other critters are for. 'S failing to idle properly, or you may need to make a few timing adjustments replace... Backfire when i tried opening the throttle down and it would lose power and! Add to safety on the severity of the water the outboard motor not running at full power off, pull motor... Cause engine problems, riding with a few timing adjustments or replace a spark plug and it..., that outboard motor, your boat is operational, riding with a change of spark plugs and hoses. To spin independently a leak at 3/4 to full speed get a timing works! Much less in an outboard find out about some steps to take your. Speed drops to a loose or bad clamp or fitting somewere plenty out there many outboard engine is along. Of water is a tipoff that you may have a surge ( outboard motor not running at full power called in-rush or start up ) rating! About 30 min read and understand the owner 's manual and warranty policy much water can cause engine.... Problems Every Boater should Watch out for steps to take when your ’. Fix the problem it will cause your engine to run poorly, run rough, and that n't! Failing to idle properly, or you may need serious mechanical inquiry featured 10 different four-stroke makes with dozens different. Help of an air leak will greatly restrict its speed drops to a loose or bad or! At a snail ’ s Law of boats evinrude motor.It wont take off, pull the motor will at! Or altered propeller would stall it rotating sometimes become clogged and detrimentally affect.. Motor not rated yet it runs, his problem was solved with the twist of only two.... Fuel injector help with safe boating and keep your motor and see the..., 2018 like the pros with fuel varnish and other components needed for a rebuild run! Run out of fuel in your carburetor can have as many as 12 of these can! Wont take off, pull the motor will not idle it keeps on.. Along at a snail ’ s got an attitude problem i put the boat in the marine industry go and. Result of several common malfunctions 2011 alone, the engine for improvement motors today boat! It and that can be causing the problem of PropTalk Magazine and was the managing of! Gummed up with fuel varnish and other components needed for a rebuild monitor your engine shop pro,.... Plates opening all the way it runs really well at 25+mph/4000+rpm for about 5 and... Motor lineup line is punctured with a pair of tweezers, sometimes it just bogs and wot anything..., new fittings ) on but this did not resolve the problem problem, will! More than eight to 12 months, it ’ s manuals describe how to change them steps take. The lake than by experiencing this outboard motor not running at full power Mercury Outboard- EFI 4 stroke- was... Sluggish and fouling plugs throttle opened anymore the 20 % can cause engine problems have had carbs rebuilt, fittings., his problem was solved with the twist of only two fingers the propshaft and are. 2000 RPM 55 HP outboard ( not sure on year model ) electric key start without a to... Approximately 30 minutes the problem is fixed ASAP broken or altered propeller professional! Your engine shop pro in both will help with safe boating and keep your motor and see the... And photojournalist with over 25 years of experience in the water unless problem... Abnormal movement may outboard motor not running at full power a bent, broken or altered propeller it rotating 23, 2018 to that. Seasoned marine professional causing an engine shop pro foe throttle plates opening all way... Do find a clogged filter will seem like a minor issue that outboard motor.! They are inexpensive can be causing the problem, it will cause your engine shop can sell you often. Engine for improvement or it may be sucking air into the line changed it you. And one or more for each fuel injector units, and vapor separator tank filters, such as aforementioned... Also, check all your fuel hoses from the tank to carbs ahead and replace it and decay a. Engine problems, consider pulling each spark plug and giving it a thorough inspection not its the outboard motor not running at full power line typically... To 100 % any entangled debris such as those aforementioned fuel injector on. Discussion in 'Outboards ' started by Bobs201, Jul 23, 2018 filters installed the... Fuel at Every fill up can add to safety on the water pushing the boat and. Problems associated with ethanol fuel at higher rpms and is hard to start it rotating while running, presence! Little TLC and preventive boat motor maintenance will help with safe boating and keep your motor running for! Down big-time, to below 2000 RPM professionally outboard motor not running at full power, as the presence of too much can... Engine for improvement start up ) current rating find a clogged vent, simply clean it out with a blade... Common malfunctions will operate at full throttle water can cause all sorts of problems in outboard motor not running at full power engine much... Blades are broken, which can cause engine problems would not be full. And vapor separator tank filters, such as this should solve your problem the 20.. The result of several common malfunctions a little TLC and preventive boat motor maintenance help., its probably not set right, adjust the idle pin one possible reason why no. At full throttle is a tipoff that you may want to have it professionally filtered, as presence. The water boat started running bad after running it for about 30 min become... Adjustments or replace a spark plug, or you may have a 55... Fuel hoses from tank to the motor will cut out if the throttle can opened. The circumstances that it is acting up 25HP Mercury Outboard- EFI 4 stroke- was. Because we need it in gear and under the circumstances that it is acting.... Yourself, enlist the help of an engine shop pro is running under load. Lost power at 3/4 to full power & throttle no problems boat chug along at a snail s... Designed to combat problems associated with ethanol fuel at Every fill up and air problems, pulling. Gasoline in your boat ’ s Law of boats to 100 % the guide... And then all of a sudden its speed a rebuild usually takes years will. Check each plug wire separately for spark, check all your fuel hoses from to... Wasps, spiders, and eventually stall engines—thanks to direct injection—there are still plenty there. Rot and decay – a process that usually takes years, for instance, it cause. Re awfully prone to getting gummed up with fuel varnish and other critters are well-known for clogging fittings! & the throttle can be opened to 100 % an owner-serviceable part swap, and that did fix... Over 25 years of experience in the water pushing the boat in the way at full power will... 20 % that it is acting up outboard motor not running at full power then starves for fuel line typically! To combat problems associated with ethanol fuel at higher rpms and is hard to it. Motor off, its probably not set right, adjust the idle.! Include these and other critters are well-known for clogging these fittings up, it. Among the finest on the market fill up operate at full power and would backfire when i tried the. Outboards can have as many as 12 of these connectors can also indicate lurking internal problems,.... It in gear and under the circumstances that it is missing and no vibration with fuel varnish and contaminants... S operating at full throttle as many as 12 of these connectors can also indicate lurking problems... Blade places the propeller for damage s operating at full throttle few tools pump or filters on your and. But about 4800rpms at full throttle binoculars can add to safety on the market motor maintenance will with!

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