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. But … However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. 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 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 is generally an owner-serviceable part swap, and many outboard engine owner’s manuals describe how to change them. 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. One possible reason why boats no longer achieve appropriate speeds at full throttle is a spun prop. The information contained in both will help you avoid damage to the motor, your boat and the environment. Surging going down river at full throttle. 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. Go down the following checklist to figure out why your motor isn't starting: Air leaks in the fuel line are typically created through either natural wear or damage to the line. There are kits your engine shop can sell you that often include these and other components needed for a rebuild. 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. We’re going to hope, at this point, that your engine is humming along, providing great performance for your boat. 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. 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. If the gasoline in your tanks has been sitting for more than eight to 12 months, it’s likely fairly stale. Once you’ve located the filter, give it a thorough inspection. 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. Attach it to your motor and see if the problem goes away. 5 Answers. Simply twist it open and monitor your engine for improvement. 8 essential end-of-season tasks for boat owners to tackle before the snow flies. Most outboard motors will run without a load to any particular RPM you like, including much too fast. 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. Before operating a Honda outboard motor, read and understand the owner's manual and warranty policy. His writing and photography have been published in PassageMaker Magazine, Soundings, Fly Fishing in Salt Waters, Yachting Magazine, and Lakeland Boating, among others. How to Maintain an Outboard Motor. 0 0. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. 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 unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. 10 Electrical Problems Every Boater Should Watch Out For. any ideas? i have had carbs rebuilt, new tank, filter and all hoses from tank to carbs. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. goods. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. Mercury 2 stroke 150 outboard dies at full throttle. Some smaller or older outboards may not even have 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. 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 Meddler: posted 08-16-2010 05:20 PM ET (US) An inefficient boat engine may well be a source of pollution. In this case, his problem was solved with a change of spark plugs. 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. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. 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. ... 1999 Yamaha 200 salt water series 2 stroke V6 Not rated yet I have been experiencing intermittent lost of power on my outboard. does not stall out. 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. So, what should you do when your outboard engine is puttering instead of purring? Afterward, inboard/outboard (I/O) owners should remember to vent the engine box thoroughly before restarting. That would cut down on the air flow. Relevance. The ball bearings and check valves inside some of these connectors can also fail. Sometimes, even after regular use, that outboard motor engine won't start. And, always add fuel stabilizers designed to combat problems associated with ethanol fuel at every fill up. Re: Motor was running fine then lost power suddenly/ little update Well it's now been 7 months since i had "the issue". I'm running a 3 blade 13x19 pitch. If you’re a little nervous about rebuilding one yourself, enlist the help of an engine shop pro. sometimes it eventually picks up and speeds up, sometimes it just bogs and wot do anything. Another possible cause is an air leak in the fuel line. They are inexpensive can be changed with a few tools. 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). Honda outboard motors … 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. If the line is punctured with a sharp object, for instance, it will create a leak. When it acts up have him check each plug wire separately for spark. 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. Answer Save. whatnot. 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. Favorite Answer. 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. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. 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. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. There are several methods to troubleshooting a stalling outboard engine. My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. 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. 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 first step in getting watercraft back to its “normal” speed, however, is to identify exactly what’s causing the problem. 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. Install a submersible bilge pump yourself, like a seasoned marine professional. Even if your boat is operational, riding with a spun blade places the propeller at risk for damage. Honda outboard motors are among the finest on the market. Basically out of the water the motor will operate at full power & throttle no problems. 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. Motor's not turning but about 4800rpms at full throttle . He is the former editor of PropTalk Magazine and was the managing editor of the Waterway Guide. Regardless of your boat’s throttle setting, the presence of an air leak will greatly restrict its speed. This might be because it's failing to idle properly, or because it's losing power. 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. Cutting away any entangled debris such as this should solve your problem. 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. That is possible as you would not be getting full throttle. Hey there new to these forums i have a evinrude 55 HP outboard (not sure on year model) electric key start. 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 it runs fine at half throttle, and loses power at full tap, you may find that you have a fuel starvation problem. Outboard motors, like any other engines, can misfire on occasion and this could be caused by many different reasons. Bout a 1998 150hp ficht evinrude motor.It wont take off ,its sluggish and fouling plugs. Anonymous. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. The engine then starves for fuel at higher rpms and is hard to start once the prime is lost. 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 don't, a clogged filter will seem like a minor issue. Put the boat in the water because we need it in gear and under the circumstances that it is acting up. My 15 hp johnson outboard motor will not run right.? 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. 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. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. 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. 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. 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. Some portable outboard fuel tanks have inline primary fuel filters installed in the fuel supply line, too. Well I put a new fuel filter on it and that didn't fix the problem. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. This ethanol attracts moisture (water) and debris which reduces fuel quality and may cause the engine to run rough (or not at all). It’s not uncommon for fishing line, rope, seaweed or other debris to entangle itself around the blade, restricting it’s normal movement. 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. This motor runs great at full power but will not idle it keeps on dying. Electric motors typically have a surge (Also called in-rush or start up) current rating. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. These filters sometimes become clogged or filled with water, causing an engine to run poorly. While carburetors are quickly becoming a thing of the past in outboard engines—thanks to direct injection—there are still plenty out there. Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? Submersible Bilge Pumps: Installing One Like the Pros. Mercury 2 stroke 150 outboard dies at full throttle. 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. Should this happen to you, the best […] If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. Motor's not turning but about 4800rpms at full throttle . any help would be greatly appreciated. A good set of marine binoculars can add to safety on the water. Their condition can also indicate lurking internal problems, too. They’re awfully prone to getting gummed up with fuel varnish and other contaminants, which can cause your outboard to run poorly. Have you checked your propeller for debris? 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. Re: not getting up to full speed Get a timing light and a buddy. It’s important to note that once you remove this filter you can’t examine it and reinstall it. i have put a new fuel system (primer, cord, new fittings) on but this did not resolve the problem. 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. 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 … 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. You may just get lucky and this solution will knock away any gum, varnish, or debris that’s causing your problems. Outboard motor not running too well? After it dies immediately check for spark. Another possible cause is an air leak in the fuel line. Surging going down river at full throttle. Yamaha offers consumers great variety with its four-stroke outboard motor lineup. Gary Reich is a Chesapeake Bay-based freelance writer and photojournalist with over 25 years of experience in the marine industry. Check out the carb, its probably not set right, adjust the idle pin. 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. Towards the end of the video can be seen a power drop. 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. 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. Make sure someone knows how a timing light works. 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 … And that can be seen a power drop regardless of your boat s. Visually inspect the propeller at risk for damage see if the gasoline your. 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