Mercury outboard won t run full throttle

it cranks and idles fine. You adjust the trunion on the cable. my 2000 model 50 hp mercury is bogging down when at full throttle. Apr 21, 2012. It will idle fine, but at full throttle it is only running about 30% of the rpm it should (guessing). Perform a visual inspection in the In order to fully rule out the existing fuel, and system, we used a external fuel tank with fresh gas and a fuel conditioner-gas cleaner additive. The fuel air mixture screws on the side of the carburettor are marked H for High for the engines high speed adjustments and the L means Low for the engines low speed adjustments. Troubleshooting Engines Not Reaching Full RPM. Find out your outboard or sterndrive's WOT rating. I have a 1993 mercury 2 stroke and it ran fine after cleaning the carb. Jan 2, 2012. A fuel hose with an inside diameter of 5/16-inch should be adequate for a Apr 22, 2009 · Apr 22, 2009. I have done this: cleaned up the carburator. Aug 16, 2007. We have a 98 25hp Evinrude that has an annoying habit of intermittently bogging down or losing power when we run at full throttle. Jul 23, 2022 · 2. It started doing this late last summer and I looked at it for a couple weekends and then gave up. I seems to run fine otherwise. The first time it happened I thought Jul 22, 2007 · mpinkstone Junior Member. The WOT test is done in three simple steps: 1. Have never run gas more than 3 weeks old. Aug 3, 2016 · Dirt in the float needle, misadjusted float setting, or a stuck float can cause that. Aug 19, 2005 · Re: 40 HP will not run at full Throttle. Air vent in fuel cap not open. My fuel line started coming apart and clogged the fuel pump and filter up. Took the four carbs off to rebuild (found a lot of varnish and crud in them). Re: Hard to start after warm-up. Another common problem that occurs with the Mercury 50 hp 4 stroke engine is power loss. Causes of Mercury Outboard Not Reaching Full RPM. Jun 26, 2008. WOT is the engine running with the throttle wide open. The Mercury-exclusive Advanced MidSection (AMS) isolates the powerhead to deliver a smoother, quieter ride than ever before. Engine starts and runs fine to half throttle. 9HP mercury won't accelerate. Its been an issue, When the motor gets to operating temperature it will start cutting out when you either give it full throttle or fast idle. . Engine Runs But Won’t Shift. Sep 1, 2012. The common culprits discussed below include:-A spun propeller-Boat propeller entangled with debris-Fuel line air leak-Corroded spark plug wiring Additionally, apart from the question of your engine operating at full power, we discuss what might be causing acceleration hesitation. To get the most accurate result from the WOT RPM test, there are a few things you need to do to ensure the data from the wide open throttle test is as precise as Check your carburetor for any grime or dirt and clean it thoroughly. It sounds like you have some gum and/or debris in your carb. I took it to the shop and they replaced the anti-siphon valve. May 15, 2006. On the other hand, if you open up the throttle and you can’t Apr 29, 2022 · Mercury Outboard Full Throttle Issues. I was able to barely idle home -ran roughest I've ever seen, replaced all the plugs and still starts up, for a short time, but won't continue running or rev. So checked compression on all 6. If you take proper Jun 15, 2006 · I have a 1984 mercury outboard 25 HP. The cooling water pump turns at the same speed as the powerhead and its flow rate depends on the motor speed. I have to use standard plugs to get it started. Easy fixes include using the correct fuel, cleaning dirty parts, and replacing the damaged components. Whether your day calls for a vacation or a voyage, a Mercury 75 to 150hp FourStroke outboard is the perfect accessory for your next adventure. Also check your choke plate to make sure it isn't stuck closed. That is when the problem started. Apr 20, 2020 · New member. Remove the engine cover and have someone move the throttle lever. Made of stainless steel and will last for life. Clean any residue from each plug contact and plug port. If the RPMS are higher than the WOT rating when you have the throttle wide open, the prop is geared more toward acceleration, and you may be giving up speed. It doesn't sputter at all. do u think it could be the oil injection system becuase the plugs keep on getting fouled up with oil. Welcome to iboats!! I'd start by checking spark, compression and fuel. Possible Reasons Why Your Boat Won’t Go Over 3000 RPM Under Load. Jun 19, 2012. Aug 26, 2007 · Aug 25, 2007. Consult your owner's manual to check items that may be unique to your motor. Stays at a max of 2,600-RPM. One of the first signs that the powerhead isn’t getting enough air or fuel is when the motor stalls, particularly when idling. Starts up quick, idles fine, and runs up to 6,000 RPM. 00 or less. Spark should jump a 7/16th gap and be a hot blue. Aug 15, 2006 · A good prop dealer will recommend a starting point and will have you try a couple of props to find the best setup for your boat. looked for the condenser under the flywheel but this model does not have any. Fuel pressure should hold all day, but I'm guessing that's a symptom, not the cause of your hard start, since pumping it up doesn't immediately cure it. I cleaned the fuel tank, totally disassembled the carburetor, checked the inline filter and it still will not accelerate. If the boat runs fine at high speed for a time and then bogs down while still running at high speed, it is likely a heat related ignition issue. I have a 2002 5. Then I can fire it right back up and it will do the same thing again. Motor starts well every time, idles well, and runs well until around 1/2 throttle. 006 may be about the smallest. Ethanol gas can cause bad gumming, especially if water gets in. Check the fuel tank carefully for debris, and clean out or replace the fuel lines and bulb. Running at full throttle at a thousand revs too low could easily be the cause of overheating on this motor. Starting point is 1 and 1/2 turns out from very lightly seated. Beginning about three years ago, the 2006 Mercury 115-HP FOURSTROKE EFI engine occasionally and quite suddenly would cut out when running at full throttle. 9 only runs with choke on. when you pull the choke on, what you are in fact doing is decreasing the amount of air, and therefore increasing the amount of fuel so, as mentioned, you have a dirty/blocked carby, or quite a bad air leak in the manifld/gasket more than likely carby rebuild though, pretty simple thing if you Check the Fuel and Air Filters. Have a newer plastic gas tank with new hose. Loss of Acceleration. Usually we give up and fish for a couple hours & try it again. #8. The rpm should be at. No it doesn't. Apr 12, 2009 · Re: 1984 Mercury 50 HP doesn't rev very high in gear and won't plain out 17' tracker Ok sounds like a carb rebuild is due. New tank, fuel line and fuel. Inadequate fuel supply is a common issue, either from pinched hoses or a lack of fuel in the gas tank (s). If I stay at a higher throttle it will rev up and back down until it chokes itself out but if I drop back to neutral it runs rough and sometimes shuts off. Engine Misfire. Both have spark in both cylinders. It has been intermittently struggling and occasionally cutting out (as if running out of fuel) since relaunching it. Otherwise you are going to have to remove the fuel bowl covers. Because your Suzuki outboard won’t start in gear, ensure the engine is in neutral. The sympton for this situation is the motor will idle ok but wont run at full throtle. These are just a few reasons for two-stroke Jun 2, 2023 · A loss of power in a 2-stroke outboard engine at full throttle can be caused by issues like a dirty or clogged carburetor, fouled spark plugs, damaged reed valves, an incorrect fuel-to-oil mixture, or a clogged fuel filter. Apr 16, 2001 · 5. Here are some common signs to look out for: Limited Speed. The problem is that when I am running at full throttle the engine suddenly dies. Jun 23, 2008 · 2. Oct 9, 2014 · Hi guys am seeking help with my 1997 Mercury 2stroke 9. It will only go around 7mph and when you give it full throttle it seems to skip & buck a little but it won't rev up and go. I have never got the engine to run good again after that. May 8, 2006 · Sep 29, 2020. Outboard motor designs vary depending on make and model, but all operate on similar principles. They are various gauges. They won't idle below 1100rpm (appox). OK. Take to the lake it wont run but about 5 miles per hour. If you notice any erosion, replace the plug. Aug 10, 2023 · One day going full throttle my engine bogged down and just ran on half throttle. When I attempt to go full throttle, it will run fine for a few seconds and then start bogging down and/or lose power. 27,314. I have heard others say to run at wot for shorter periods and cruise at 4200. Try tapping the fuel bowl moderately gently with a screwdriver handle, if the float is stuck that might free it. I came out of a no wake zone, pressed down the throttle, boat took off as always, planed out. We limped in to the trailer stopped by picked up fuel pump kit and took it back out and the idle was perfect. The engine has 240 hours on it and the problem started occurring at about 170 hours. But most likely you need a carb overhaul. 1980 uses the very common ql77j4c and starts hard as well. Engine runs smooth, and doesn't smoke, just will not turn up to rpm. Feb 6, 2002 · Its my understanding that outboards are only designed to run at full throttle about 10% of the time (I dont remember where I read this, but I did). mercurymang said: Sounds like you need to pull the cables and verify the movement. Here are the possible causes and solutions: Possible Cause: Damaged or misadjusted shift cable Solution: Inspect the shift cable for damage. Quick Steer decreases lock-to-lock steering at the helm to approximately a quarter‑turn in each direction, while still providing full steering Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. Aug 5, 2017 · The most likely cause of the 90-HP engine losing power at full throttle after a short time at that setting is due to loss of fuel, likely caused by a restriction in the fuel supply or a marginal fuel lift pump. If it doesn’t start with a half dozen pulls, wait 10 minutes and try again. Occasionally, a Mercury 2-stroke outboard may run properly but not shift into gear. Jan 31, 2019 · 40hp mercury 4 stroke efi won't run at full throttle motor idles fine at the ramp but bogs down and sputters after about 100 yards. Mar 23, 2016 · stuckey73 New Member. It will do this for a while. At full acceleration its runs the same as if it were idling. Most seem to be dirty or clogged carbs. Jun 19, 2012 · New member. Compression should be over 100 on all cylinders and within 10% of each other. Here are some common factors to consider: 1. I have turned the slow idle needle every which way but lose with no change. When I changed tanks, fuel from marina, while running full throttle, engine would bog down, repeatedly. When you push the choke knob in, the choke plate in the carb should be wide open, allowing air into the carb. Comfort. Compression test Good Fuel pressure test good Scanned with diacom no codes all parameters in the game new plugs cap and rotor Replaced the exhaust water shutters Cleaned all debris from exhaust. I have a 2003 90 HP 4 stroke Mercury that bogs when I take the throttle beyond 3500 RPM. That is a Tohatsu motor and if you check the Honda/Tohatsu threads you will see lots of posts on idle problems. I just had it out of the barn yesterday and hooked up to garden hose to do my pre river checks. My 1990 low hour Mercury 25 has always run great. Jan 27, 2013 · The Boating Forum - Motor won't run without choke - I have a 25 HP outboard on my flat boat. I took the boat out to test and it ran great at full throttle for about 15 minutes Jul 9, 2019 · I'm a beginner with motors so please bear with me. I is acting funny after not being ran in a few months. In case of any blockage, you can clean out the filter or replace it with Jun 8, 2010 · My engine has had two new coils and plugs, it runs beautifully up to 60% throttle, anything over that and after 10 or 15 seconds the unit starts spluttering. In gear it will run at around 2000 rpm, and occasionally rev up to 3-4000 rpm for a sec, and die back down to 2k. Then it started losing power after going wide open. fires back up no problem and will take off for a few Jan 15, 2008 · 8,646. You can usually buy single guitar strings at a music shop. I tried to go out on my boat this week and my 2. ken071362 said: This 2004 bigfoot on a tracker 21 has run well until today. Messages. I need help troubleshooting a problem and I need answers to a few questions. Fuel filter is clean and bowl full. Test out your boat's operation at full throttle again. I have done this:cle Feb 4, 2022 · We hope this read offers you valuable insights into why an outboard motor may not be running at full power. The motor also seems to shake substantially more. It runs fine i low rpm and in idle as you can see in the video. Jul 4, 2012 · Yes they are designed for running at wot but running any engine at its redline will reduce its life expectancy. Starts great and ildes great and will even run great at low RPM, but when you try to accelerate the engine falls flat on it's face. #1. Many people think wot is bad, many others think low rpm is bad. The smaller ones are usually $1. May 30, 2023 · 5. In neutral, it will spool up no problem. 0l mcm Serial #OM336918 471 hours Maintenance kept to the letter. I just bought a 1998 Mercury 40 hp outboard (serial # 0G660803, model 40M?). At home it runs great with water hose. The engine is a 2017 Mercury 150 4-stroke mounted on a Tracker boat. Run your boat at WOT. An outboard engine will come with a specific RPM range that it is supposed to run in. If you have a relatively old fuel tank, look for any debris at the bottom. One of the nice, big clear plastic ones from the auto parts store is perfect. I have a 2 Stroke Yamaha 30HP that is about 7-8 years old (I could confirm if that will help). Sep 6, 2011 · The outboard is a 1999 2stroke 9. Verado Advantage. The primer bulb did not collapse when the engine slowed down. racerone said: Do a compression test. Been working on a 2006 Mercury 15 HP 4 stroke that I recently got from someone that hadn't used it much in 2 years. I prime the bulb, the motor cranks on 1st turn, runs well for several mins at full throttle, then dies/loses power. Apr 25, 2005 · 65. I have a 2009 Mercury 20 hp F20E outboard. After that, the RPMs seem to increase, but the speed doesn't. Carburetors have been cleaned. It’s comfort in a class of its own. it did this last week, so i drained the carbs and it ran fine. From one day to the next my Mercury Outboard would no longer get past 3000 RPM. Examine fuel filter for clogs, and fuel line for kinks or leaks. I found a a hole in the fuel hose and fixed it. Re: Engine only runs with choke on. Changed back to first tank, ran great rest of trip. For everyone who might have this problem, I thought I would share the solution to the problem. Sep 12, 2004 · Sep 13, 2004. Try using Stabil, and get rid of all that May 16, 2015 · I bought a 1999 Mercury outboard motor 200 HP EFI, it runs but took it out on water and it only went to 3000 rpm and then wont plane. It will do it again, but after working on it 10 more minutes it all of sudden will Aug 13, 2010 · issue: outboard motor (75hp mercury tracker -- 3 cylinder, 2 cycle) cranks, run well for several minutes at full throttle, then dies (or sometimes idles if I pull back the throttle when I hear the engine losing power). Do not use the choke, open the throttle all the way and try starting again — it will usually take at least 2 to 3 pulls. Sep 22, 2016. There would be No issue with the Gas being old as the gas was purchased this year and the motor is stored indoors during the winter. Symptom: Motor runs great most of the times, however it intermittently begins to miss and sputter. If the engine is not running at its optimal RPM, it may consume more fuel than usual, resulting in shorter trips or more frequent refueling. to a higher speed. Sep 20, 2016 · Messages. Need advice please: I have a 2010 Mercury 40 HP EFI 4-stroke ELPT4 outboard with 70 hours that looses power after running for more than one hour. I've installed a new Stator, New Power pack & New Plugs. Since then, and at least 50 times, the engine has suddenly lost power. When it’s perfectly clean, adjust the carburetor’s settings to provide your engine with the proper fuel-air mixture, then try again riding at full throttle. Apr 24, 2012 · Apr 24, 2012. Engine was working fine. If the throttle linkage is moving the cables are configured correctly. Sep 11, 2009. It feels like about 1/2 to 3/4 throttle when wide open. cleaned the filter for the fuel. Jan 15, 2008. #9. I let it set up for two weeks now it has a rough idle and slow throttle response. after about 30 seconds it shut down to about half power. Now the thing is if i keep pushing the choke it will rev up to about 5000 and seem to run somewhat normally. it was water in the fuel. put in gear, it runs fine at idle speed. i think it may have been the gaskets on the oil injection Jun 28, 2012 · With only me in the boat today I was able to reach wot or close to it but it took way to long to get it there and with passengers I was not able to come even close. <br /><br />Then, put a fuel filter in the fuel line between the tank and the bulb. Almost like I was pulling something really heavy behind me is the best way I can describe it. The problem: 9. Oct 10, 2022 · Diagnosing a Mercury Mariner 60hp 2-stroke outboard that won't rev out or accelerate. (Motor matched to 13' Boston Whaler by manufacturer) After an hour of running a combination of 3,000 to 5,500 RPM, the engine Nov 4, 2022 · If you’re lucky, you won’t have to buy any replacement components, and the issue will be fixed at this stage. Sep 16, 2014 · So the issue at the moment is that it won't rev up over 2000 rpm while under load. I can put it back on neutral and accelerate and will do fine but as soon I go back in gear, he doesn't have enough power. Aug 16, 2007 · Messages. Apr 24, 2022 · This 2006 engine is from an apparently short lived-joint venture with Yamaha, and has less than 650 total hours. The carbs were loaded with water and the fuel filter was half full of water. Re: Engine will not stay running without choking. You can run em without the metal. -----Check spark on all leads. 2) When pushed to full throttle is simply chokes, spits and dies. Adjust each carb to obtain 'Best Idle Speed' by making very small changes, waiting a minute or two between each adjustment. Dec 4, 2013 · Dec 4, 2013. Regular maintenance and troubleshooting can help identify and rectify these issues. Mar 25, 2020 · Mar 25, 2020. 3. Mar 27, 2012 · I have a 1989 Mercury 40 hp 4 cylinders, 2 strokes that run fine for about 10 minutes, then it started losing power but never shuts off. When the engine experiences power loss, it may not be able to function at its optimal level, which can be Jul 25, 2011 · 480. I don't have a spark gap Jan 2, 2012 · 1,895. On the V12 Verado outboard, all 200-hour When the outboard motor fails to start, verify all of the following: Gas in the tank. Apr 16, 2001. It idles fine, but when I throttle up, it bogs down and dies, unless I get off the throttle and let it idle. As for the fuel pump I had a similar problem with a 70 horse and a fuel pump rebuild ($11 kit about 15 mins to install) made the thing Inline 4. checked the plugs. They feature efficient, lightweight designs that ensure no power goes wasted – the ideal way to get wherever you want to explore next. Most manuals come with a troubleshooting guide specific to Jul 28, 2014 · The 1974 won't start with the gap less plugs mercury recommends. It just dies. Re: 40 HP Mercury stalls when given throttle #2. She runs up to full throttle in a tank and holds it no problem, but Mar 30, 2013 · 2. Oct 10, 2018 · Oct 10, 2018. Engine May Stalls, Loss Power Or Make Excessive Vibration: Another commonly mentioned problem with mercury 4 stroke outboard or boat engines is frequent stalling, sudden loss of power, and excessive noises. 1. 9hp outboard it runs great in idle and reverse but as soon as you click into forward as you increase speed it'll kick in but then start to decrease speed after about 10 seconds but sometimes will run fine for 10 minutes or so but then it reduces its self to about a walking pace !! Outboards typically have a WOT (Wide Open Throttle) rating, which gives you an RPM target for when the throttle is wide open. Relax, that's not unusual, and it's not a sign of impending doom. When this began, the primer bulb was collapsing at the time of the bogging. Replace the propeller with a higher or lower pitch prop. . You do not adjust "linkage" on the engine for either the throttle or gearshift. Re: 70 hp evinrude no power at full throttle. It is mounted on a tinny we bought about 5 years ago but has still down very little work. once i go to take off, it starts bogging down and won't get above 2800 rpm. last year on a fishing trip, ran great on first 4 gallons of fuel. This can be caused by a variety of factors, such as a clogged fuel filter, a dirty air filter, or a faulty spark plug. If he ran it out of gas it's possible he sucked some deris from the bottonm of the tank into the system a good carb cleaning might be in order. No change, no change at all in max RPM. Also it will not open up almost like from the time i put it in gear and give it throttle it boggs down. All this means in the short, is that the engine is spinning as fast as it possibly can. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Safe cruising speed is the boat on plane, getting the best Jul 1, 2023 · Decreased Fuel Efficiency: A Yamaha outboard not reaching full RPM can lead to decreased fuel efficiency. Re: mercury 60 hp 4 stroke efi stops running. Looking for some help. Mar 29, 2013. Known for their reliability and performance, these engines have become a popular choice for boating enthusiasts worldwide. Available for Mercury outboards rigged with the Single Outboard Electric Steering system, Quick Steer provides rapid steering and more precise throttle control in tight quarters, such as when docking. I've had the carb. Personally I like to run mine for best economy at 3050 and put the hammer down from time to time for some thrills. Re: Mercury control won't go back into neutral. I am having a problem with my 2002 Mercury 40 HP. It will run at wake speed for about 10 minutes {With the throttle on max}then sputter to full power, it may or may not drop back to wake speed. Sep 28, 2012 · Re: 1980 25 hp mercury outboard won't start. As suggested, check the fuel tank vent to verify it is open. May 15, 2006 · 26. Jun 15, 2022 · Here’s a run-down: Make sure that the kill cord is attached. Idle mixtures screw need to be adjusted while IN the water and idling IN Forward gear. My theory is a leaky carb float valve (is that a carb or injection Sep 11, 2009 · Messages. If she runs fine at high speed until you shut her down, and then she bogs upon restart, it could be fuel or ignition issues. Marine Mechanic: Captain Dave. #2. Jul 1, 2023 · Identifying the symptoms of a Mercury outboard engine failing to reach full RPM is the first step in troubleshooting the issue. Linkage is good and it will rev up at Apr 18, 2022 · The common causes of 2 stroke bogging at full throttle include using the wrong gas mix, dirty or clogged air filters, damaged spark plugs or barrel gaskets, and damaged intake manifold gaskets. Inspect the fuel filters and the air filter too if your outboard has one. It did on my 115. Apr 5, 2019. May be time for a 10 micron fuel/water filter if you don't have one. First, remove the filter and blow through it. 2. Jun 11, 2018 · I have a 2011 mercury 115 HP four stroke serial number 1B843908 Started with having problems with bogging down at speed. nwjones18 said: I have been working on an old jon boat for a while now. Find a Dealer. Re: 90 HP Merc - runs then dies after throttle. Apr 27, 2005. Its not good to rev up like that, if theres a fuel clog you're turning a cyl at 5K with no lubrication. Try running a very strong mixture of SeaFoam mixture with the gas or something like Techron Fuel Mar 15, 2010 · 4. If you're going to leave your boat very long, run all the gas out of the carb, and keep minimal amounts of gasoline in the tank. However, like any mechanical piece of equipment, there might be problems … Mercury 40 HP 2 Stroke Problems Sep 3, 2013 · Sep 3, 2013. Apr 23, 2018 · We came out of the idle zone easy on the throttle and were impressed by the power difference. Sometimes after it is running you can pull the throttle back,then push it up and Apr 28, 2014 · 8,958. Modern 90/10 gasoline has a tendency to break down very quickly--producing a rubber eating acid. I have a 4-stroke 4hp Mercury outboard (dinghy) motor which was working fine but went unused for 3 years until recently. Engine looks remarkably clean, but bogs down to the point of dying when I go from idle to full throttle. Compressions are all normal. Feb 2, 2009 · Feb 1, 2009. 9 4-stroke won't idle. Check for a dirty or old spark plug, improper carburetor adjustments, or broken or faulty ignition wires. Mar 26, 2015 · Mar 26, 2015. I have a 2008 4 stroke Mercury 60 bigfoot on pontoon boat. Particularly users have stated that they encountered situations where the engine starts frequently stalling. Mar 15, 2010. Has fresh gas and added some HEAT to it. When it happens we stop the motor take it out of the water for a minute or so, start it back up and Oct 9, 2020 · This is one of the causes of engine stalling since the amount of fuel getting to the engine is only sufficient to run the engine on idle but cannot sustain a full throttle. One other thing: This is a used boat and used outboard. Jul 28, 2011. 9 Mercury (I add outboard oil to the gas premixed), it is/was in near new condition only using it a couple times each year. I have a 1996 Mercury 115 ELPTO that runs perfectly. Nov 27, 2017 · You have two choices for a fix: Wait about 10 minutes and try starting again. Just no power. Re: 40 hp mariner won't run at full throttle. #4. Nov 7, 2008 · Marine Mechanic: Captain Dave. I'd get 4,500 - 5,000 rpm no problem whatsoever. Oct 10, 2015 · I have a problem with this outboard - it won't take full throttle. If necessary, adjust the cable according to the service manual’s instructions. it starts great idles fine and mid range runs fine when i go to full throttle it dies out but will restart with little effort can anyone help. Now, if I pull the choke lever out, it runs just fine. If this is the problem the only fix is to take the head off and remove the metal. Put the carbs back on (in their original order), and the motor starts and idles fine. Jun 24, 2021 · If your 40 HP 2-stroke outboard engine runs fine but won’t reach full throttle when in gear and only revs up in neutral, there could be several potential causes for this issue. The idle time seems to get May 23, 2023 · By the end of this guide, most of our readers should know exactly what is wrong with their boats! In This Article hide. Easy Maintenance. Fuel shutoff valve is on. Took it to mechanic and tested it. #3. Debris on Your Propeller. An easy-access door on the top cowl takes the hassle out of routine engine oil checks and fills. Engine always has and does start with no trouble even after Oct 24, 2010 · Oct 24, 2010. Re: Mercury 2 Stroke 50hp Won't Idle. I thought everything was fine until a few days later when it happened again. Sep 4, 2013. Badly Chosen Prop. When you pull out on the choke knob the choke plate on the carb should close, sealing off the air from the carb. A timing light will quickly show if the dead cyl is sparking or not. Mixture Screws. [repeat!] Aug 14, 2012 · 39. Re: Mercury Outboard Slows Down at High Speed. Engine Misfires or Stalls: In some cases, you may experience engine misfires or even complete Apr 29, 2019 · Apr 29, 2019. This is determined by using the correct pitch of prop etc. Re: 9. 5 hp Mercury 4 Stroke would idle but will not accelerate. The first thing to check before anything else is the mixture screws. It would troll all day long but sometimes and only sometimes at increased speed it just does not want to go. Debris in the Gas. I will try to explain this the best possible way. Re: Mercury 40hp gear and throttle set up. 2 Problems:1) I have to press the bulb on the gas tank on occasion as engine starts to sputter and stall. I also tryit to squeeze the ball when it Or full throttle, sticks down, to the pins, trimmed to the teeth. #10. Oct 26, 2020 · VERY intermittent problem continues for over a year, can't seem to identify the problem. **Propeller Damage or Mismatch:** Check the condition of your propeller. the problem started when i forgot to open the vent on the gas can and i ran it so long that the tank almost imploded. Im not saying it will fail if you run it wot for that long, but I dont believe it was designed for it. All the signs say not firing on all cyl's, troubleshooting will zero in on where and why. Ask Your Own Boat Question. I checked the throttle linkage at the motor and its opening all the way. I have a 1987 Mercury Classic 50 serial# 0B109521. #23. Had it on the water for the first time today. Solution: Inspect the fuel filter for any obstruction. Apr 20, 2023 · Problem 2: Power Loss. All the electricals are working except it showed all the cylinders were not putting out like should. Clean or replace the filters, and also drain any water from the fuel/water separator if you have one. However, if you’re still stuck in the same problem, then there is a good chance that you’ll need to purchase a new fuel pump. However, it won't go above about 3,200 rpm. rebulit checked the fuel line and put new gas Remove all your spark plugs with a ratchet and appropriately sized socket. or close to upper limit of the operating range with the usual boat load. Apr 5, 2019 · New member. When the problem is happening, the motor will run smoothly at idle and at low throttle while in forward gear. Electric guitar . Just picked up an older Mercury 402, 40HP. I tried pumping the bulb but the engine did not seem to pick up. kmacd said: The 70 hp 97 engine starts and idles fine. I Rebuilt the carburetor's also. Sometimes, after flooding, it will start and then die. Re: Safe cruising rpm and WOT rpm the same or different. Jun 28, 2008 · Some old mercs have a piece of metal below the engine housing in the exhaust channel that can break lose and wedge in the exhaust channel. Make sure that there’s no water in the fuel lines. Jun 3, 2011 · Jun 3, 2011. These were a few common issues you can expect with a Mercury 4-stroke EFI outboard. Starts and idles normally but after 30 seconds or so when at full throttle Jun 4, 2023 · The world of outboard engines is vast and filled with numerous brands and models, but one that notably stands out is the Mercury 40 HP 2-stroke engine. 28,769. It seemed to run fine up to 3000 RPM but once I got at that RPM the motor sta Mar 7, 2011 · Re: Full throttle and 2,500 RPM it will not go higher than that. I was finally able to get back to the boat. Apr 8, 2010 · Re: 9. 5. Re: Optimax 115HP engine does not go to full power. i've drained the carbs 3 Jun 17, 2007 · Jun 17, 2007. #7. Gets used for about 3 weeks each summer then it's back in the should for the year. Apr 28, 2014. One of the problems is that it is completely unpredictable as to when it is going to happen. Running the half hour from the house to the launch ramp at a max of 2,600-RPM. Use a plug gap tool to set the correct measurement on your plug gaps, according to your manufacturer. If they are moving fully back and forth then something else is going on, other wise, it's as Bob and Mark said, your control box in worn out. I was going to rebuild the fuel pump but remembered when on full throttle and doing a big 10 miles an hourlol I squezzed the ball and it stalled so probably not a pump issue. It bogs down some, but doesn't usually stall. It will not run over 3000rpm We have done the following. Jun 7, 2009 · Mar 23, 2012. -----Is this something that developed suddenly ? I'm going to do a compression test when I get home tonight. its now doing it again. We are going to replace the gaskets, clean out the carbs, drain the fuel filter and replace it, and also put in an Oct 10, 2015 · Hi GuysI have a problem with this outboard - it won't take full throttle. ct aw ld hg td hq cb jt ga qt