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! 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