We would like to show you a description here but the site won’t allow us.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. These were a few common issues you can expect with a Mercury 4-stroke EFI outboard. If you take proper care of the unit, then there is a good chance that you won't have to worry about these issues again.10-08-2015, 08:34 AM. My 2004 Yamaha 40hp outboard loses power when under load. After about 15 minutes of operation the engine will lose power and revs only when a high load is put on the engine. For example, when towing a tube and coming out of a circle, or when motoring through small waves or swell. To stop this problem i simply come back to ...The first thing to do is to run the engine off a portable tank using a different fuel hose. If the problem goes away, the issue is your fuel flow. The possibilities are: 1. Your tank vent is blocked. Test as suggested above by loosening your filler cap.Yamaha VZ150TLRY starts and instantly dies. Last night I changes the VST filter and paper filter in the clear fuel filter on my 2000 Vmax 150 HPDI. I changed it after this past Sunday was on the water and at high rpm's the motor started surging and doing the fuel starving thing. So I ordered the filters and last night went ahead and put them on ...Re: 90 hp mercury runs awseome for 90 seconds then cuts out. A weak hish speed ignition will limit power and RPM will 'hang' at the limit of the voltage. A weaken fuel supply will limit power to a fixed point in the throttle opening, any further opening of the throttle and the fuel mixture goes LEAN in the upper carb (s) and melts piston (s).Messages. 4,087. Mar 27, 2012. #2. Re: Mercury (Classic) 40 hp loses power on full throttle. Typically when a motor starts, idles, and runs well at full throttle for a bit, and then performance dies down it is a failing ignition component. And LOL at "classic". There are some guys on here with motors from the 30's and 40's!!Tweet. #1. Bogging down under load. 03-04-2011, 12:40 AM. I have a 50 yamaha with 150 hrs on it. When I put it I the water, and put it in gear, I can't get over 1400 rpms. Now if I just use the cold start lever it revs right up. There is a little red lever under air silencer.01-20-2016, 10:31 PM. Hi, I have a 2001 Yamaha 40hp 2 stroke that will not idle. The motor starts and idle very rough and then dies. The issues appears to be with the number one cylinder. If I disconnect the number one spark plug wire, the engine will stabilize and idle on two cylinders. If I reattach the number one plug wire the engine will ...Tweet. #1. Yamaha 15 hp two strokes dies at low rpm. 03-07-2015, 02:57 PM. I had my Yamaha 15MSHU two stroke overhauled last year. The first time I used it in December it started on the first pull and ran perfect. In February I went to use it and it would only start at a very high RPM setting.Boat owners who have been using a 2 stroke outboard engine might sometimes experience a power loss when running their boats at full throttle. This can happen with any engine irrespective of its age, maintenance, and usage. In such situations, it becomes crucial to diagnose the problem and fix it to ensure smooth and efficient … 2 …04-14-2016, 10:38 AM. New to the forum; first post. Thanks in advance for help. I have a 1997 c40tlrv 40 hp 2-stroke, 3-cylinder motor. It has always been reliable and performed well. Recently, I have developed a problem where it will hardly ever stay running at idle. If I start it and put it in gear as soon as the advanced idle period ends, I ...62,321. Aug 8, 2010. #8. Re: Motor dies when shifting into Neutral. Put in a new Mercruiser OEM new style cable, and your problems will be over. If the cable doesn't move VERY EASILY when unhooked, then it will be even worse when hooked up. You are fighting a faulty cable, that's all there is to it.If a motorcycle or ATV only runs with the choke on, it's because the richer "choke on" mixture is actually closer to the engine's normal operating fuel mixture than the leaner "choke off" mixture. So when the choke is turned off, the engine gets too little fuel and too much air for it to run and it stalls.Jul 25, 2019 · 6hp 2 stoke, bogs down and dies at low revs/throttle. 07-25-2019, 01:38 PM. I spent the last couple of hours taking apart and cleaning the carb on my Yamaha 6hp 2 stroke. The engine was running perfectly until a month or so ago. Moving the throttle to the start position the engine might turn over a couple of times before dying.Some of the reasons why Johnson outboard motors lose power at full throttle includes overloading, overheating, use of bad fuel to oil mix ratio in the 2 stroke variant, use of bad spark plug and faulty ignition system. When these problems occur, the power generated from the outboard motor will be reduced.Jul 18, 2021 · Old or Flooded Engine. If your 2 cycle engine starts and then stops running, then the engine may be flooded. In order to tell whether or not the engine is flooded, remove the spark plugs. If the spark plugs are wet, then the engine has flooded. If your 2 cycle engine is flooded it may be probably dead and the gaskets need to be replaced.Jun 24, 2021 · Faulty Impeller. Bad Spark Plugs. Malfunctioning Fuel Pump. 1. Tangled Propeller. If your outboard motor will not throttle up, the issue may be as simple as a tangle. Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle.Re: Root cause of Mercury 2-strokes' rough idle. Rough idle is a subjective statement. If all is normal, 2-stroke idle is acceptable. Sometimes near as good as a 4-stroke. Many things can affect idle quality. Probably too many to mention. The one that we fear the most is uneven compression. C.10. Jun 18, 2017. #1. Hello all, I'm having an issue with my 25 hp Merc that seems to be fuel related. Started running rough, surging, dying on idle. Replaced spark plugs, cleaned carburetor and replaced gaskets. Runs about the same.70 hp 2 stroke low throttle issue. 04-01-2018, 06:41 PM. Just put my project 1987 70 hp etlh 2 stroke engine in the water for the first time this weekend. only history i knew on the engine was that it came off of a 16 foot bass tracker and had sat unused several years. i cleaned the carbs (three times actually as i missed a jet the first two ...When it dies out, if I manually squeeze the primer bulb it will often fire back up. ... Does the level of the 2 stroke oil affect the operation, in example I know the generator on my motor home will shut down when the oil is too low. ... 1995 90 HP Mercury Outboard - runs for a while then shuts down New developments in regard to this. After …This abnormal movement may indicate a bent, broken or altered propeller. Turn the motor off, pull the motor out of the water and visually inspect the propeller for damage. Suzuki outboards are produced by Suzuki Marine. They can range from 2.5 horsepower to 300 horsepower. Outboard motors are attached externally to the stern.480. Jul 28, 2011. #10. Re: Engine will not stay running without choking. You can usually buy single guitar strings at a music shop. They are various gauges. The smaller ones are usually $1.00 or less. Made of stainless steel and will last for life. Electric guitar .006 may be about the smallest.To check if your gas pump is working well, inspect the relay, fuse, fuse holder, and harness connector pins. For the fuel pressure, you should aim for something between 4 to 7 psi. Yes: All good, next test. No: Your fuel pump is most likely not pushing the correct amount of fuel inside the carburetor/engine. As a result, your engine cannot …Mercury 2-stroke 125 hp stalling issues at idle. Alumacraft1. 04-21-2012, 09:19 PM. All, I am having some issues with my Mercury motor. I bought a new to me/used boat in february of this year. It is a 1996 alumacraft trophy with a 1996 Mercury 125 2-stroke motor. The owner had to replace the impeller, so that is brand new.I'm a beginner with motors so please bear with me. I have a 4-stroke 4hp Mercury outboard (dinghy) motor which was working fine but went unused for 3 years until recently. It has been intermittently struggling and occasionally cutting out (as if running out of fuel) since relaunching it.In the water, exhaust back pressure is encountered due to the fact that the exhaust housing (housing between the powerhead and the lower unit) is filled with water. This would drag down the needed rpms, affecting ignition. Normally the clue to this type problem is that the engine starts fine on a flushette (hose), but is very difficult to start ...Any person can experience a stroke at any time. Strokes may range in severity from mild strokes that cause temporary weaknesses to major strokes that may cause one side of the body...Most two-stroke engines have two screws that allow you to adjust the carburetor. One of these screws adjusts the mixture of the gas/oil/fuel mixture, and the other screw controls the speed of the idle. To adjust the carburetor, you need to have the engine running. Slowly turn the screws to adjust the carburetor until the engine is running …Mar 21, 2018. #1. Ok... I just purchased an older boat with a 1982 Mercury 50HP 4 cyl 2 stroke. When I first got it I had no spark so I replaced the stator. Now I have spark, it cranks for for about 3 seconds then dies. I have to choke and throttle it all the way up for it to actually crank. It cranks revs (smokes a lot) and then dies.I'm still receiving my education in outboard motor troubleshooting, maintenance, and repair. 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).I prime the bulb, the motor …01-27-2007, 05:56 PM. we have a 13 year old yamaha 175. after running for about 10 minutes, engine bogs down to low rpms, sometimes stalls. runs perfectly up to that point, up to full wot rpm. comes back to higher revs briefly when we pump the bulb. replaced primer bulb, external water separator filter, and checked fuel lines for cracks. any ...You might try running Sea Foam through it before spending a lot of money or time on a manual clean out or rebuild. Put a pint in 3 gallons of fuel. Run the motor for 15 minutes, then let it stand for 15 minutes. Repeat that cycle 8-10 times. That will clean out any carbon buildup in your motor and should help immensely.2. Put in forward gear. 3. Runs fine for a few seconds (even seems to accelerate normally if I open up the throttle) 4. Red light suddenly turns on at the same time that it starts running super rough. 5. Runs rough for about 5 minutes, not letting me go very fast, but still pushing the boat a bit. 6.06-30-2010, 02:49 PM. 2000 115 2 stroke wont idle. Hello, I am having the same problem with my 2000 Yamaha 115 2 Stroke. I can not get the engine to Idle. I have; 1) Replaced the oil water seperator. 2) Replaced the fuel filter. 3) Replaced the fuel pump.Nov 21, 2006. #6. Re: Yamaha 30HP 2 Stroke Running Problems. Alarms go off because of overtemperature or an oil related problem. A thermostat stuck shut will cause overheating. A thermostat stuck open causes poor running as the engine never gets to operating temperature. An oil related problem can kill the engine.Have some issues with my 90hp Yamaha outboard motor. It recently died on me out on the water. Got towed in and the engine starts fine then stalls out after 10 seconds. When I go to start it again it dies out sooner than the first time. Thinking it's a fuel issue but not sure where to start. Changed the inline fuel filter as well as the fuel ...Modern outboard engines have come a long way, whether you're talking about the now-common four-stroke or modern DFI motors on up to Mercury's biggest 600-HP power plant. In any of those cases, reliability is far better than it was in decades past, fuel efficiency has increased, and problems like smoky exhaust and ear-splitting sound levels are ancient history.4. May 1, 2014. #2. Re: 15 HP 4 stroke runs only while choke is completely out. budonzi said: Usually my Merc starts right up with the choke out and continues to run at idle when the choke is pushed in. This year, at start up, it dies out when the choke is pushed back in. I put in Stabil last Fall and ran it dry before putting it up for the winter.Messages. 4,087. Mar 27, 2012. #2. Re: Mercury (Classic) 40 hp loses power on full throttle. Typically when a motor starts, idles, and runs well at full throttle for a bit, and then performance dies down it is a failing ignition component. And LOL at "classic". There are some guys on here with motors from the 30's and 40's!!Suzuki DF250A runs good and then dies. 10-18-2021, 10:23 AM. Good Morning All, I have a 2002 2800 hydra sports boat with twin 2018 DF250 engines. The boat seems to run great until I stop somewhere for a while and start back up. It will usually run for 3-5 minutes and then die. I get 3 beeps when it shuts down.Then it dies. This would leave you to believe the others are not firing correctly, but this isn't necessarily so. ... Hello , I have a 2004 Yamaha 2 stroke 50 hp outboard. The engine seem to run good for about 15 minutes. Only went up about 3/4 throttle.(New Boat to me). ... I have a 2 stroke Yamaha 90 outboard. The motor starts just fine and ...Yamaha 40 HP 2 stroke - starts, idles shortly, then dies. I recently purchased a 15 foot whaler with a 40 hp 2 stroke Yamaha outboard. The previous owner had it regularly serviced and hadn't shown an issues until today. I was out with a buddy today and it was running fine.Current Bike (s):1981 Yamaha XS400 Special 2. Posted March 11, 2009. The bike hasn't been running to my knowledge for 4-5 months. Prior to my purchase the previous owner, a friend, said he cleaned the carbs. Basically, she'll start up fine and idle around 1500-2000 rpm (full choke) but upon going to 1/2 choke or giving her any throttle, she dies.I have just purchased a second hand 2003 2 Stroke Johnson 8hp outboard. Perfect condition, clean almost new (looking) When cold it starts and runs fine. When hot it will not idle and just cuts out. It is then impossible to restart it until it has cooled down to cold! Today (we are in spain) we ran it for 5 minutes at full throttle, it was not ...I have a 2005 90hp 2 stroke Johnson carbed outboard. I pre-mix the fuel and oil, and still have the original fuel / oil pump with the oil side disconnected and plugged properly. My problem is at low RPMs, about at "no wake" speed. After running the motor for just a couple of minutes at low RPM, when I give it more throttle, it bogs down and dies.i have a 1988 Yamaha 40 2 stroke 3 cylinder Autolube. last year it ran good , but. not 100% ! Started it up 1 week ago and it takes 3 tries almost every time to start. once started it idles VERY rough . a low idle and then suddenly a higher idle and then a low idle , then "click" , "pop" and it dies . all of this happens in about 10-13 seconds ...Here are the steps to fix a two-stroke engine not starting when hot: Check the fuel. Clean or replace the air filter. Check the spark plug. Ensure the compression is 110-130 psi (758.4-896.3 kPa). Ensure the oil to fuel ratio Is 50:1. Clean and adjust the carburetor. Replace worn crankshaft bearings and seals.The Stroke Minority takes an active role to advocate minority issues related to the Council's involvement in the scientific and lay communities To take an active role to advocate m...May 9, 2004. #2. Re: Yamaha 200 HPDI starts and dies!! Has this boat sat up any length of time? Did you add fuel stablizer to the fuel and run it thru the system. It sounds like a fuel pressure problem. The high pressure fuel pump in the vst/fuel chamber. You need to put a fuel pressure gauge on this engine.Some of the reasons why Johnson outboard motors lose power at full throttle includes overloading, overheating, use of bad fuel to oil mix ratio in the 2 stroke variant, use of bad spark plug and faulty ignition system. When these problems occur, the power generated from the outboard motor will be reduced.This fouling may result in a weak spark or no spark at all, making it difficult to start the engine. Another factor that may hinder the successful starting of a 2-stroke motor is the lack of a dedicated lubrication system. Since these engines rely on the fuel and oil mix to lubricate their internal parts, it is essential that the right ratio of ...Clean and gap to spec, or replace. Check spark is hot. While plugs are out of the block, test the fuel pump. To check fuel pump, disconnect fuel line from carb. Squeeze hose. bulb until fuel empties from end of carb hose into a jar. Place thumb. over end of hose. Crank engine a few times.I know of a late 90's ocean pro 90 hp 2 stroke that the guy says runs, but has a knock. ... or repair or to run unitl it dies....seemingly good price and it comes with guages, the binnicle controls, and cables. ... If you run it until is quits then who knows. B. bob johnson Rear Admiral. Joined Feb 25, 2009 Messages 4,304. Mar 25, 2009Yamaha 40 HP 2 stroke - starts, idles shortly, then dies. I recently purchased a 15 foot whaler with a 40 hp 2 stroke Yamaha outboard. The previous owner had it regularly serviced and hadn't shown an issues until today. I was out with a buddy today and it was running fine.May 10, 2020 · Tohatsu 5hp 2 stroke runs fine for 20mins then quits and won't restart! sharpey: Engines and Propulsion Systems: 27: 14-06-2018 13:41: Tohatsu 5 2-stroke VS Tohatsu 6 4-stroke: Distant Shores: Auxiliary Equipment & Dinghy: 33: 13-04-2015 19:16: Yanmar 3gm30 dies after running: 2liveonboard: Engines and Propulsion Systems: 7: 02-07-2013 06:492007 75hp efi runs great then powers down and dies. put in some sea foam and some tko and ran it 3/4 throttle for 20 min. ... I have a 1984 2 stroke 75 hp Mercury outboard, it runs great off the hose at home but won't get over 1500 Rpms full throttle in the lake, ...The motor starts in about 1/2 a turn, it runs perfectly at idle. It will shift into gear but bogs down when it is under a load. It will not get past 2000 rpm's. Here are the things ive done so far. 1. cleaned carbs with cleaner and air pressure. 2x's. made sure needle was falling when float comes down 2. Drained all old gas out, put in new gas ...I have a 2002 Mercury 60 HP 2 Stroke engine that starts fine idles fine runs great up to a certain RPM and then starts to sputter and won't go any faster, top speed on my boat is 26 MPH and will only go 12 MPH and the starts to sputter. replaced the fuel pump went thru the carburetors still the same results.Nov 11, 2008. Messages. 328. May 23, 2012. #6. Re: Warm engine dies. yes the choke is opening, the engine will die even if it is revving higher than idle, at higher revs it also becomes impossible to keep it running, then engine shudders, coughs and spits up thru carb. Been doing some archive search and been reading about coils possibly acting ...I have a 2006 Bentley 24-foot pontoon with a Mercury 90HP 4-stroke outboard engine. In May of this year, after months of inactivity, my wife and I took the boat out. It started right up and sounded just fine. While pushing out of the dock, the low voltage (4 short beeps every 2 minutes) alarm began sounding.Nov 21, 2013 · Modern outboard engines have come a long way, whether you’re talking about the now-common four-stroke or modern DFI motors on up to Mercury's biggest 600-HP power plant. . In any of those cases, reliability is far better than it was in decades past, fuel efficiency has increased, and problems like smoky exhaust and ear-splitting sound levels are ancient histoApr 17, 2012 · 429 posts · Joined 2011. #4 · Apr 17, 2012. tried it again to move it after it sat awhile. started up once. idled as long as i wanted. i hit throttle and it died. did that same thing 1 more time. then it started and died by itself as described above. then proceeded to not start. battery charger made no difference.Jul 29, 2010. Messages. 2. Jul 29, 2010. #1. I have a 3 year old tohatsu 6hp extra long shaft for my sailboat. Has run great till about a month ago. I was going out, the motor had been running for about 10 min. when it suddenly stalled. I was able to restart it easily but when I put it back in gear it bogged down and stalled.When a Suzuki outboard motor stops running because of an overload on the engine, or begins to operate irregular, then follow these simple troubleshooting steps to pinpoint the cause of the problem. For reference, these repair instructions pertain to certain electronic fuel injection Suzuki outboard motors experiencing the following scenario ...Re: 90 HP Merc - runs then dies after throttle. Welcome to iboats!! I'd start by checking spark, compression and fuel. Spark should jump a 7/16th gap and be a hot blue. Compression should be over 100 on all cylinders and within 10% of each other. Just before it dies, try priming the bulb and see if that helps. U.Posts: 102. 2 stroke outboard starts but then dies when throttled or idle. I have an 8hp Mercury 2 stroke outboard for my dinghy and it has generally been very good, but recently after having just filled the gas with 97 Premium (at Valero) and adding the …Mercury & Mariner Outboards . Starter issue mercury 40 hp 2 stroke ... . Starter issue mercury 40 hp 2 stroke. Thread starter Justinehammer; Start date Jul 7, 2020; Justinehammer Recruit. Joined Jul 7, 2020 Messages 2. Jul 7, 2020 #1 Hi all. ... First, when starting, the engine runs and then dies. Sometimes the starter will get stuck engaged ...Tweet. #1. Yamaha 15 hp two strokes dies at low rpm. 03-07-2015, 02:57 PM. I had my Yamaha 15MSHU two stroke overhauled last year. The first time I used it in December it started on the first pull and ran perfect. In February I went to use it and it would only start at a very high RPM setting.All gauges work including oil pressure. I can rev it up to say 1100 RPM and will stay running. The accelerator pump was replaced with the rebuild kit. If I don't mess with RPM it starts and dies within a second or two. If I don't pump gas it has a bit of a extended crank then starts and dies.New Suzuki 150 losing power and running rough under load. 09-14-2019, 10:15 PM. Hey everyone, I'm new to Suzuki's and this forum. I have a new Suzuki 150 with 21 hrs on it. It has run fine since new. I did the 20 hr service on it last weekend and was able to get it on the water today. Idled out from the ramp and brought it up on plane and ...Boat: Island Packet 38. Posts: 31,351. Re: 15 hp Mercury 2 stroke won't run. A way usually to confirm a faulty fuel pump is to pump the bulb, if it runs fine as long as the bulb is kept tight, that is a good indication of a faulty pump Sent from my iPad using Cruisers Sailing Forum. 15-10-2015, 05:31.A car engine uses a four-stroke cycle -- how can two strokes accomplish the same tasks? Learn all about the two-stroke engine, where it's used and how it compares to a four-stroke....I have a brand new Yamaha 4hp 4 stroke outboard, but cannot run it at full throttle. 1. From cold, the motor starts easily and I have to push in the choke right away. 2. At low throttle, I have run the motor for 40 minutes with no problems. 3. Within 30-60 seconds of accelerating to medium/full throttle, the motor dies over a few seconds.Why a Small 2 Stroke Engine Only Runs on Choke. 'Full or Half' ChokeA two-stroke engine running only on choke can be attributed to several factors. When you ...1. Failure of the Oil to Lubricate the Cylinders. It is critical to mix oil with fuel in a 2-stroke engine. Some 2-stroke Yamaha 40 outboards, particularly older models from the 1980s and 1990s, had a mechanism that injected oil into the fuel rather than requiring it to be pre-mixed. These would occasionally fail.Jul 29, 2010. Messages. 2. Jul 29, 2010. #1. I have a 3 year old tohatsu 6hp extra long shaft for my sailboat. Has run great till about a month ago. I was going out, the motor had been running for about 10 min. when it suddenly stalled. I was able to restart it easily but when I put it back in gear it bogged down and stalled.For 2-stroke you can use a synthetic blend or full synthetic. Fuel Mixture Ratios: 2-stroke engines require a specific mixture of oil and fuel. If the mixture is too lean (too much fuel, not enough oil) or too rich (too much oil, not enough fuel), it can cause the engine to cut out. It is advised to employ a fuel-to-oil ratio of 40:1 cradle to ...The problem is at full throttle opening. The motor will run for about 10 secs then dies. Idles ok and part throttle is ok. Starts again ok. To me it sounds like fuel starvation at full power. I've changed the line from the tank to the o/b. Cleaned the coarse filter in the tank. Changed the in-line filter.15 minutes ago, pgiganti said: I have an old Yamaha CT1 175 two-stroke that's been sitting for a few years. I put in a new piston and rings and rebuilt the carb. Now it starts right up on the first or second kick, idles for about 60 seconds and sounds OK, then suddenly speeds up and dies. It doesn't make any unusual sounds when it's running.Outboard motor sneezing is an audible result of a lean fuel mixture resulting from problems in the carburetor. Described variably as a sneeze, cough or stutter, an outboard motor or any engine will lose its ability to run smoothly if it does not receive enough fuel. In small engines, the culprit is the carburetor. On modern automobiles a fuel ...29. Aug 30, 2009. #5. Re: Yamaha 25 4stroke starts then dies. Soaked the carb overnight in carb cleaner. And then reinstalled everything. I primed the bulb until it was hard and it fired up on its own after 10 seconds of cranking and then died again. It idled fine for about 30 seconds and the nothing. After the intial start up the motor would ...999. Nov 26, 2017. #3. Your problem has been going on for two years. If you would bet your life the fuel system is perfect,then. It's a wire, just a guess, anything this weird and long is usually a wire corroding almost all the way through in a wire connector. Pull all wires that go into a wire connector very hard.And,A leaf blower starts and then dies from old fuel, a plugged air filter, a clogged fuel tank vent, a plugged fuel filter, clogged fuel lines, or a dirty carburetor. It can also stop running when the spark arrestor is clogged, the cooling system is plugged or the choke isn't set in the correct position. Always take safety precautions before ...Yamaha 2 stroke outboard motor loses power if it has problems like faulty carburettor, bad fuel to oil mix ratio, use of contaminated fuel, bad fuel line, fouled plug, bad ignition coil and overheating. when any of these problems occur in the two stroke Yamaha outboard motor, it will drastically reduce the power output of the outboard motor.. Jun 26, 2018 · 06-26-2018, 04:52 PM. I have If it isn't, it will cause your engine t Big Jon Honda 5hp Outboard Shop Outboards. ... 2000 mercury 40hp 2cyl 2 stroke running and starting problems I have a 2000 30 HP 2cyl 2 stroke that sat outside for a few years. It fired right up, then stopped. Re-built carb. No joy. The problem was a cracked hose between the fuel pump and the carb. I also replaced all zip ties to prevent any ... The cause of Queen Victoria’s death was a series My engine is a 2008 Mariner 40 HP 2-stroke 2 cylinder ( Belgium version) S/N 0P550276. I bought it six months ago and tested it in a barrel and it ran like a dream on the 3rd pull. When I opened the throttle, it would always take a second or two for the engine to catch up and increase rpm. I payed no attention to this.Some of the reasons why Johnson outboard motors lose power at full throttle includes overloading, overheating, use of bad fuel to oil mix ratio in the 2 stroke variant, use of bad spark plug and faulty ignition system. When these problems occur, the power generated from the outboard motor will be reduced. Jul 31, 2009. #10. Re: 15hp wont run unless I keep fooli...
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