Motor's not turning but about 4800rpms at full throttle . If they get clogged with dust and dirt, this can affect engine performance significantly by starving the engine of air. In this case, his problem was solved with a change of spark plugs. 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 the line is punctured with a sharp object, for instance, it will create a leak. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. parts, accessories, boating supplies, tools, & aquatic sporting 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. Gary Reich is a Chesapeake Bay-based freelance writer and photojournalist with over 25 years of experience in the marine industry. Joined: Jul 2018 ... if it stays running it's a fuel delivery issue. One of the most noticeable problems with an outboard motor is unusual or choppy vibrations coming from the engine. With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. Some portable outboard fuel tanks have inline primary fuel filters installed in the fuel supply line, too. ... 2006 25HP Mercury Outboard- EFI 4 stroke-2006 25HP Mercury Outboard- EFI 4 stroke- motor was cutting. 1 decade ago. 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. It’s related to Murphy’s Law of Boats. This ethanol attracts moisture (water) and debris which reduces fuel quality and may cause the engine to run rough (or not at all). sometimes it eventually picks up and speeds up, sometimes it just bogs and wot do anything. any ideas? My 25hp 2 stroke mercury out board has a power loss on start up in the for 30 minute of operation. 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 you’re unable to fix your old engines you can browse our huge range of outboard motors today on Boat Trader. 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 … 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. I suggest you check for fuel line leaks or it may be sucking air into the line. Attach it to your motor and see if the problem goes away. Relevance. Well I put a new fuel filter on it and that didn't fix the problem. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. That is possible as you would not be getting full throttle. 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. 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. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. Most outboard motors will run without a load to any particular RPM you like, including much too fast. Another possible cause is an air leak in the fuel line. Air leaks in the fuel line are typically created through either natural wear or damage to the line. Discussion in 'Outboards' started by Bobs201, Jul 23, 2018. My 15 hp johnson outboard motor will not run right.? The Meddler: posted 08-16-2010 05:20 PM ET (US) But … If it isn’t, it will cause your engine to become fuel starved, run rough, and eventually stall. The engine stalls in neutral, at idle, only. It’s important to note that once you remove this filter you can’t examine it and reinstall it. Some motors have a control device that if the motor becomes hot it reduces the rev's so not to overheat. For more information check out our eco friendly boating guide. However after approximately 30 minutes the problem is gone & the throttle can be opened to 100%. Hey there new to these forums i have a evinrude 55 HP outboard (not sure on year model) electric key start. Many outboards—especially newer models—have a slew of onboard fuel filters that can become clogged and detrimentally affect performance. 10 Electrical Problems Every Boater Should Watch Out For. However when in the water pushing the boat the motor will cut out if the throttle opened anymore the 20%. 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. Last year at the end of the season the boat started running bad after running it for about 30 min. Each had unique engineering specs, power capabilities and intended uses. It’s not uncommon for fishing line, rope, seaweed or other debris to entangle itself around the blade, restricting it’s normal movement. Honda outboard motors are among the finest on the market. 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 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. Once you’ve replaced or unblocked the connector, reinstall it and check the engine for any improvement in the way it runs. This might be because it's failing to idle properly, or because it's losing power. Once you’ve located the filter, give it a thorough inspection. 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. Cutting away any entangled debris such as this should solve your problem. The motor … read more Does your boat chug along at a snail’s pace, even when it’s operating at full throttle? 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). Electric motors typically have a surge (Also called in-rush or start up) current rating. If you don't, a clogged filter will seem like a minor issue. 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. 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. When it acts up have him check each plug wire separately for spark. 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. This occurs when the bond between the propshaft and blades are broken, which subsequently causes the rubber insert to spin independently. You may want to have it professionally filtered, as the presence of too much water can cause engine problems. 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. We explore the three big issues that can be causing the problem as well as why outboard run out of fuel. then it would lose power again and would backfire when I tried opening the throttle. Check the linkage foe throttle plates opening all the way at full throttle. And, always add fuel stabilizers designed to combat problems associated with ethanol fuel at every fill up. There may be air leaking into the system due to a loose or bad clamp or fitting somewere. That would cut down on the air flow. 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. 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