Mercury Outboard Won T Rev UpLeaning toward a defective coil. I need help troubleshooting a problem and I need answers to a few questions. Inboard/Outboard mechanic Mercury/ Mercruiser, Volvo Penta and OMC, Johnson/Evin. If you aren't hearing a severe growling noise coming from the stern, we can rule that out. How long has the boat been sitting idle in the water?. FIXED!! WHY A 2 CYCLE ENGINE IDLES, BUT WONT REV UP? HAS …. The thermostat regulates the water coming out of the pee tube. Find out your outboard or sterndrive's WOT rating 2. Hi GuysI have a problem with this outboard - it won't take full throttle. Just recently I’ve had my Mercury optimax sitting in neutral only to have the RPMs increase. Once the rubber boot tore, the engine would suck in a bunch of air and rev up again; causing the engine to not run at all, or run at such a high RPM it was ridiculous, if not downright scary if you didn’t know what was going on! This ended up being another quick fix though. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse 5. A CDI-brand replacement will fix that for good! Resistance checks alone might tell you but you may have to check voltages while it's running. The last couple of times I've been out on our boat, I haven't been able to reach WOT of about 4800 rpm. If the voltage is less than 9 1/2 volts during the cranking there is a problem in the battery circuit. In a clean can containing a gallon of gas, pour in the correct amount of oil. How Many RPMs Should a Boat Run at? Is it Bad to Run an Outboard Engine at Full Throttle? How Much Does Prop Diameter Affect RPM?. To fix the problem, the boat's engine and parts must be inspected. Otherwise you’re just wasting time. Propeller pitch or diameter, damaged blades 3. The coil assemblies of Mercury outboards (which are often referred to as "the stator") are somewhat infamous for being the source of. 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. Like the title says, 1999 50 HP Merc 2-stroke losing power at wide open throttle. The next thing to do is put this actual stand section in that props the motor up. Parked the 25 in the building until I could get to it today, one month later. I know there are quite a few things that it could be but I would first check your battery because if it is weak and is discharging when not in use it may be "marginal" for starting the engine and then after your alternator puts some juice back in it has enough to start it up more easily. Re: 1979 Mercury 140 Outboard won't rev under load Definitely check the stator, failure to rev up is a common symptom for stator issues. So the issue at the moment is that it won't rev up over 2000 rpm while under load. Linkage is good and it will rev up at idle. June 3, 2012 at 12:34 pm #1277541. my engine runs really smoothly. The only way for me to get it to go back down. It also won't go into reverse. The inability to produce the required revolutions per minute is one of the most common engine problems. If any of these elements are missing due to broken . That makes sense because a symptom of a spun hub is that as you increase power, the engine will start to rev, but the boat won't go faster . 2004 Mercury 2 stroke won't rev up under load. Why is your outboard not reaching top speed?Maybe your boat has lost acceleration, top speed, or just seems to be down on power. If the carburetors were a problem I don't think that the operation would be so good up to 2,600-RPM. At the very top, #7 is your upper crankshaft seal. It started doing this late last summer and I looked at it for a couple weekends and then gave up. The only way for me to get it to go back down was to shut the motor off put it in neutral and start the motor back up again. It engages the lower unit fine and makes the boat get in gear but will not take any rpm's. Why is your outboard not reaching top speed?Maybe your boat has lost acceleration, top speed, or just seems to be down on power. I have a 2008 4 stroke Mercury 60 bigfoot on pontoon boat. The first step in this is putting a little nylon bushing on the top. I got the engine professionally serviced earlier this summer after purchasing the boat and it was. I've had a couple issues but one seems to persist. The poor WOT performance may just be a clogged fuel filter and the high idle may have . Mercury motors are notorious for running warm. Hi GuysI have a problem with this outboard - it won't take full throttle. F225 Won't rev over 2800 RPM. 2002-2005 Mercury 40 50 60 EFI Repair Manual 4-Cylinder, 4-Stroke. Burned up the tank of gas in the 40 and put fresh in again today for trying the 25. It seemed to run fine up to 3000 RPM but once I got at that RPM the motor sta. When I attempt to go full throttle, it will run fine for a few seconds and then start bogging down and/or lose power. With the boat in the water i can put the motor in drive and it will run at idle speeds but as soon as I try to throttle up, the motor will stop running. Can't get pass 3000 rpms on my Mercury 60 4. This video will cover the main reasons for why a Mercury outboard engine cranks but will not start and how to correct the problem. This should be the first thing to check if you’re having RPM troubles. To fix the problem, the boat’s engine and parts must be inspected. A high quality PDF service manual for a Mercury OptiMax 225 Pro XS Outboard. So the issue at the moment is that it won't rev up over 2000 rpm while under load If your outboard is set up like this, and you ran low in the remote tank, the outboard would then begin pulling. Any transmission problem would be engine revs no forward motion, or boat won't go to neutral. racerone said: I believe that pinching off the fuel supply stopped the flooding. 9 hp, inline 2 outboard by mercury (on photo below), so it is wise to know the local regulations before purchasing a new and modern outboard motor so the issue at the moment is that it won't rev up over 2000 rpm while under load you can test for a "spun hub" by painting or scratching a line across the inner rubber hub and outer metal hub, put …. Take a close look at the throttle cam to roller adjustment. How to Do the WOT RPM Test in 3 steps. Run it at idle and part throttle ( to where it will go without issue )for say 5 minutes then start trying to rev it higher every minute or two. When I attempt to go full throttle, it will run fine for a few seconds and then start bogging. Engine Won't Reach Operating RPM. that by moving the throttle, it wouldn't rev the motor up. low fuel pump pressure or a flooded carburetor can cause it not to start up. Read on to learn more about why your boat won’t go over 3,000 rpm under load and how to fix this problem. 9 HP owners will consider a non-starting issue to include the following: Problem: Engine Surges or Runs Uneven. No need in going hog wild and tearing the engine apart to find out that it was a weak plug. As long as this is not a mechanical issue and is due to gummed up internals this stuff should clear it out. Like the title says, 1999 50 HP Merc 2-stroke losing power at wide open throttle. What I know Primer ball in the fuel line seems to be holding firm. Troubleshooting 2 Stroke Ignition Problems. It loads up and stumbles at 2200rpm then slowly gets to about 2800 rpm and nothing more. Besides - an engine running on half its cylinders will still rev freely. Opened the carb, looked clean, sprayed it out anyway. Read on to learn more about why your boat won’t go over 3,000 rpm under load and how to fix this problem. Thread: Mariner 175 no power under load. These units require at least 9. Mercury Outboard Idles Rough and Stalls. Bit of a stumper,I just purchased a boat with a 1988 mercury 100 hp motor on it, I had him hook up the ears on the motor and tested it. If the needle and seat is stuck closed, fuel will not enter the carburetor and the engine will not start. I have done this: cleaned up the carburator checked the plugs cleaned the filter for the fuel looked for the condenser under the flywheel but this model does not have any. Starting from idle when I hit the throttle to max, it will get up to ~ 1500 RPM and just bogs out. Pretty much ruled out fuel, carburetors, or fuel pump. Fuel is not mixed correctly or the gasoline contains. From one day to the next my Mercury Outboard would no longer get past 3000 RPM. There are a few signs that your engine isn’t working as it should: Overheating Engine timing out Ignition not starting properly or bogging Burnt out spark plugs and coils Defective power pack or connections Crossed coil signal wires, can cause a damaged piston if not fixed. Won't idle ~500 rpm's according to tach. Boat Won’t Go Over 3000 RPM Under Load. A car will boost to a higher revolution in park if the idle is set improperly or there is a leak. A spun hub feels like a loss of . up past 4000 rpm Show More Show Less. To correct this, empty the fuel tank of all oil. I have a 2004 Quicksilver 460 with a Mariner 40hp 2-stoke from the same year. Yesterday it started up fine we headed off 5 mins down the lake at speed and started to troll. They dropped the minimum rate for their co. 4 beeps 07 optimax pro xs Mercury. Mercury outboard won't start after warmed up. Re: 25hp Merc won't pull and rev under load. Common Mercury Outboard Shifting Problems. The second suspect for me would be carbon build up on the piston. Suzuki Outboard DF15/30/40/50 HP Four stroke Fuel Pump Diaphram $ 64. 2001-2005 Mercury-Mariner 2. Had a similar thing happen and it ended up being a hole in the water jacket. Read on to learn more about why your boat won't go over 3,000 rpm under load and how to fix this problem. In neutral, it will spool up no problem. Diagnosing Common Outboard Motor Problems. Runs really smooth up to when it won't get more RPMs. strong> it could be the service warning that most Suzuki's have. So you will either need a helper to work the light, or to drive the boat for you. So I basically idled around the lake for the tournament the whole weekend. Starting from idle when I hit the throttle to max . 45 mins later off to a new spot and the motor won. If your outboard motor will not throttle up, the issue may be as simple as a tangle. For the majority of times, these issues are related to users using bad. These units require at least 9 1/2 volts to fire properly. Now if the problem was the lower crankshaft seal, or the carb gaskets, pulling the plug wire would not have done anything, and the engine would have rev'd up as soon as you started it. If your outboard motor will not throttle up, the issue may be as simple as. The primary cause is the lack of regular maintenance. I have a 1995 25HP Mercury Tracker Outboard that recently started acting up. Once the rubber boot tore, the engine would suck in a bunch of air and rev up again; causing the engine to not run at all, or run at such a high RPM it was ridiculous, if not downright scary if you didn’t know what was going on! This ended up being another quick fix though. mercury outboard trigger test. If the propeller blades or shaft is bent, you may try to bend them back, but you probably won’t be able to do so accurately. Turn off key 3. Mercury outboard shift linkage diagram. It usually results from repeated starting attempts with the choke or primer out. I took the cover off of the motor and can see that by moving the throttle, it is moving the linkage back on the motor fine, it just won't rev up. They called me and said they found trash in the thermostat and the motor was in Guardian mode. Had a similar thing happen and it ended up being a hole in the water jacket. Boat wil accelerate to 2000 rpm then won't go any faster. Outboard Motors. Give it a few tries, and if it doesn’t start, then wait ten minutes or so and try again. This also happens sometimes when I ease the throttle up. Boat runs fine, isn't acting funny at all-just won't go faster, even with the throttle pushed all the way down! Marine Mechanic: James , Marine Mechanic replied 12 years ago It's. Other than that, avoiding the use of a fuel stabilizer also leads to similar issues with the fuel pump. Both engines run fine up to that point. 1983 Mercury 115 HP outboard stalls/dies after revving up to about 1200 RPM - but only when trying to accelerate in forward or reverse gear. My Mercury EFI 150 outboard starts and idles fine, but the. Motor won't rev up to max RPM. At Idle cold it runs SMOOTHLY, and warm it runs smooth with no missing or hesitation right up to that brick wall of 2,600-RPM. Reving your engine to 5500 in neutral is not a recommended practice. Simply twist it open and monitor your engine for improvement. A simple issue may be that the spark plugs need replacing. Print Out This Guide: Mercury Outboard Troubleshooting Section …. Type and Octane possibly old fuel 2. Ralph Rose Started September 14. This will verify if the leak is in the hose and then you know where to look. Engine Won't Reach Operating RPM. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. Torque Specifications 1971 Evinrude modification; 1970 johnson 60 torque specs; evinrude 1939 3 It does offer a 30-day free trial, but after the trial you'll have to pay $8 1979 Evinrude 115 HP Outboard power tilt trim timeing on a 1989 150 HP evenrude what is the torque on a 1987 evinrude 225hp flywheel nut 1977 johnson 85 hp choke 1979. Steam/smoke out of telltale until in gear and hitting about ~1200 rpm. Tried running 2800 again on the port engine-same issue. When starting motor up it turns on and idles perfectly finewhen in neutral I will lift the fast idle lever up and it'll run up to 5000+ rpmsthe problem is when I try to go full throttle it would get to a little over 3000 rpms and just stall and stay thereI don't hear any warning alarms or any thing coming from the. I first disconnected the low oil switch, because the way I understand it, it will not allow the engine to rev up. Fished for about 30 min and then it cranked right up, but now my boat does not have the power to get on plane, the highest it will run is 3,000 rpm. Nobody makes a more reliable, powerful, and efficient lineup of outboard motors than Mercury: Verado, Pro XS, FourStroke, SeaPro, and Jet. But, when you increase RPM, the engine revs with little or no acceleration because the prop begins to spin. One of the most common problems that mercury outboard faces are complications of a battery issue. You can't just buy another one if they aren't living up to your expectations. Recommendation for Suzuki outboard repairs. you could start it fine, rev it up as much as you wanted to but when in gear and moving the "vibrations" would cause the pin to "short out" and not send the signal to the fuel pump. Mercury 225 optimax pro xs. There are two. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. I have a 1999 225 hp Mercury, carbureted outboard that frequently won't rev up under load. Mercury 200 pro xs fuel consumption. If the engine turns over or cranks like it always has, then chances are you are looking at a fuel problem. 25hp Johnson won't run at at full throttle. ferrex stud finder manual telegram rocket license key poppy playtime mod menu pc. There are a few signs that your engine isn't working as it should: Overheating Engine timing out Ignition not starting properly or bogging Burnt out spark plugs and coils Defective power pack or connections Crossed coil signal wires, can cause a damaged piston if not fixed. In gear it will run at around 2000 rpm, and occasionally. I got the engine professionally serviced earlier this summer after purchasing the boat and it was running perfectly fine. Mercury Won Up T Rev Outboard. Took the boat back out this weekend and it still didn't get but about 24 mph running at 4400 rpm. 2018 Mercury Optimax Pro Xs250 Hp Flywheel 8m007045 Good Used Flywheel Off A 2018 Mercury Optimax Pro Xs 250hp Outboard. Outboard Not Running at Full Power. If your outboard motor isn’t running at its best, check the fuel vent on your portable tank to make sure it’s open. Outboard Idles Roughly Or Stalls. I have a 1999 225 hp Mercury, carbureted outboard that frequently won't rev up under load. would suck up into the carburettor) as it would eliminate whether it's a . Check the gap on all the spark plugs. When starting motor up it turns on and idles perfectly finewhen in neutral I will lift the fast idle lever up and it'll run up to 5000+ rpmsthe problem is when I try to go full throttle it would get to a little over 3000 rpms and just stall and stay thereI don't hear any warning alarms or any thing coming from the. I have spent approx 30-40 hours on the lake. One quickie test you could try is to see if the engine will spin up over 2500 RPM with the trans in neutral, at the dock. Things that have been suggested from bar stool Merc techs: fuel filter, fuel pump, fuel line/primer ball. In this article, I will reveal the most common problems that may occur with the Mercury 25 HP 4 stroke outboard motor and let you know how to deal with those problems. It cranks and acts like it wants to start, but it will take many turns of the key before it actually fires up (sometimes it will start up but only stay running for a few seconds). This is a 2-stroke Mercury 115 hp outboard boat motor for sale You can start it several minutes later and the power is gone again So, while an outboard might have a lower power rating, it will be spinning faster Before I used the boat last week the cranking. Outboard Motor Manual Tilt and Lock. 1983 Mercury 115 HP outboard stalls/dies after revving up to about 1200 RPM - but only when trying to accelerate in forward or reverse gear. My boat will rev up good in neutral but soon as you put it…. 3 Common Problems With Mercury 4 Stroke Outboard Motor. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat’s carburetors. Plugs changed often, impeller and gear oil. Why Your Outboard Motor is Not Running at Full Power. Won't idle ~500 rpm's according to tach. With ears hooked to the motor using the fast. This is very common if you're using an in-motor tank (these are generally only seen on outboards up to about 6 HP). Mercury Outboard Won T Rev Up 2003 Yamaha 90 HP Outboard Won't Rev-up passed 2,500 RPM! Has Good: Spark, Compression, Fuel and Clean CarbsThe fix to this problem was a bad fuel pump di If your outboard is set up like this, and you ran low in the remote tank,. Nobody makes a more reliable, powerful, and efficient lineup of outboard motors than Mercury: Verado, Pro XS, FourStroke, SeaPro, and Jet. My 97-98 Mercury 40hp outboard won't start after it has warmed up. 150 HP (2013) Mercury Fourstroke with 15x15P SS Enertia (Thanks Todd!) - 41 MPH at 5800 RPM, light load. As a result, you will experience your outboard motor’s RPM fluctuating up and down. You need to start with the basics. 2) Check the Voltage on the red (or purple) Wire at the CD Unit. T Rev Won Up Outboard Mercury. 7 Reasons Why Your Boat Won't Go Over 3000 RPM Under Load. Mercury simply changed the design and put the sensor on a 45-degree angle. how I fixed my power trim motor. --Revisit carburetor cleaning / fuel pump diaphragm. merucy 90hp two stroke wont rev up?. I've had this motor for 7 yrs now. At one point, it was maxed out at 15 mph. June 12, 2016 at 7:20 pm #1624116. Mercury/Johnson/Evinrude - Finding the sweet spot on Boat motor idle. rebulit checked the fuel line and put new gas. If no change go back to taking it easy for a few minutes. *****ed for over 2 hours no problems at low RPM. Post by srr5008 » 21 Mar 2012, 14:47. I just changed the high pressure fuel pump on my 1997 200 mercury efi and it now cranks right up. That makes sense because a symptom of a spun hub is that. Mariner/Mercury 40hp 4cyl 2. 7 Reasons Your Outboard Will Not Throttle Up and How …. No big surprise - overheats while idling/moving slow. If you don't see it, then it could be a jet, or a clogged internal filter on the carb (I know that a lot of Mikuni carbs on jet skis have internal filters, not sure about merc outboards, but I would bet they probably do) But before you tear into the carbs, go ahead and verify that it is a clogged jet, by trying it again, while priming the bulb. 4 Common Mercury Verado Problems And How To Solve Them. Hook the spring in the bottom here and then flip it over and that spring is now tight that just saves me having to sort put it in and really stretch it. Ended up replacing the engine for a newer 1. For possible solutions, you might need to replace the ignition sensor or electric fuel pump. Search: Mercury Outboard Won T Rev Up. This should be the first thing to check if you're having RPM troubles. The fix to this problem was a bad fuel pump diaphragm that was Flooding out the #3 cylinder. Low pressure on the fuel pumpFuel tank air vent is closed or restrictedDamaged or restricted fuel lines and fuel filters. T Rev Up Won Outboard Mercury. Although I did have some cracks in the hub - replacing it didn't change anything. Fuel Pump Issues There are many reasons that can lead to issues with the fuel pump in your Mercury 115 Four Stroke motor. 2006 mercury verado 150 service manual. I have a 2004 Quicksilver 460 with a Mariner 40hp 2-stoke from the same year. It seems at times my outboard won't rev up to full rpm at times and almost like it goes into a safe mode. Run it up to see if you can get over that hump but don't hold it at over 3000 - 3500 RPM for more than several seconds with no load. Mercury motors are notorious for running warm. Replace the propeller with a higher or lower pitch prop 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 possible. First, check the battery state and make sure it is charged enough to start the engine. Mercury Outboard Won T Rev Up over rev is as 18ft Classic King Billy pine dingy with cuddy cabin 'Leila-May', built in Franklin in the 1950s Mercury outboard cranks but will not start refers to. sap journal entry upload template beretta m9a4 optic plate tractors for private sale. Search: Mercury Outboard Won T Rev Up. It was suggested it might be a spun hub, but that wasn't it. Hopefully some Merc guru here will know those numbers. First time I pumped the ball this weekend it didn't "release" and stayed compressed. So I basically idled around the. Investing in outboard motors is not a joke. It's not a spun hub, or the engine rpms would rev really high without much (if any) forward motion. A CDI-brand replacement will fix that. Mercury 40 Hp 2 Stroke Outboard Long Shaft ₹ 3. 2002Tiara/Pursuit 3400 $168,000. Inboard/Outboard mechanic Mercury/ Mercruiser, Volvo Penta and OMC, Johnson/Evin. The best choice is to just pull it all out, clean everything and install new lines, filters, etc. LEU; GLF; WAL; Mercury 75hp Outboard Question Recent Topics. 🔷️ HERE IS PART 2 of this Mercury outboard fix. 28,712. The outboard marine mechanic should carefully read the text and become familiar with the Mercury 115 hp marine engine service manual procedures before beginning40 hp mercury wont idle Wiring Diagram for 1985 Merc 50hp 2- Stroke Outboard Boat Engine 1999 40 hp mercury outboard will not idle This has only happened with the. It planes around 3000rpm and seems happy to run there. Engine runs smooth, and doesn't smoke, just will not turn up to rpm. Connect a jumper Wire directly from the battery (+) terminal to the red (or purple) Wire. Mercury Outboard Runs Then Dies // Try This Before You See. 9 horsepower Mercury outboard will not activate; e. 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. I purchased the boat a week ago tested it on the river everything seemed fine. I moor the boat in a private harbor but over the past 2-3 weeks the water levels have dropped and for. More detail is needed but carburetor would be my first guess. jeremy fountainthemowermedic1mail and business inquires [email protected] Two Stroke Range Out Board Motor (Obm). Mercury outboard limp mode reset. If you have a two-stroke outboard motor, you must add oil to the fuel to This troubleshooting guide will help you diagnoses a Mercury. It will rev up to 5500 rpm's when in neutral out of water. There are simple checks for this and a 1/2 hour (again) of investigation can sort out these problems easily, given someone that's familiar with the engine. A weak ignition or fouled spark plugs, either will limit the power output. Outboard Motors. I have a 1999 225 hp Mercury, carbureted outboard that frequently won't rev up under load. Motor idles, but won't accelerate. However, if the valve is actually stuck open, your engine will likely exhibit characteristics of a cold start. I have a 1978 Mercury 500 50 hp thunderbolt. You should see water come out of the thermostat. Isolator & MAP Boot Tearing. Had the exact same problem, mine turned out to be the wiring harness had a "loose/shorted" out pin that went to the fuel pump. -Use the idle lever about 1/2 - 3/4, you won't over rev since the jet . Mercury Outboard Won T Rev Up >I have a 1994 mercury sport jet, there is a valve stem coming out of the top power head it looks like it was added after it was bought can anyone tell me what. Mercury 115 hp won't rev up past 2500 rps under load. A short plot summary about the manga “Love Storm: Pha Yu Rak Thom Chai” would help many anime and manga fans decide whether they want to watch this show or not. 7 Reasons Why Your Boat Won’t Go Over 3000 RPM Under Load. Let’s take a look at seven reasons why your outboard won’t throttle up and how to fix them: Tangled Propeller; Poor Gas Quality; Clogged Fuel Filter; Fuel Hose Replacement; Faulty Impeller; Bad Spark Plugs; Malfunctioning Fuel Pump; 1. 2002+ Mercury 150hp, 175hp, 200hp EFI Repair Manual. Also, check the fuel pressure and the spark plugs in case they need to be replaced. Test it by disconnecting the wire from the CDI unit and then reattaching it. Most Common Problems With Mercury 25 HP 4 Stroke. Re: 1979 Mercury 140 Outboard won't rev under load Definitely check the stator, failure to rev up is a common symptom for stator issues. Lacks getting up on plane, and not running full power on plane. Okay, it sounds like the trim limit switch is not calibrated correctly, you will find it in the front of the engine under the cowl. Was a small leak in the top of the cylinder. Would run fine off the hose in the back yard but under load would crumble. My Mercury EFI 150 outboard starts and idles fine, but the RPM wont accelerate past idle. It seemed to run fine up to 3000 RPM but once I got at that RPM the motor sta. The motor will start up and idle fine. What did your carb rebuild consist of?. Mercury/Johnson/Evinrude - Finding the sweet spot on Boat motor idle. Its quite surprising how well some outboards run when down one cylinder. Always start troubleshooting with the simplest items first. I would shut the motor down put it in. I then checked all the resistance valves according to the book, and all where fine. Re: 1984 Mercury 50 HP doesn't rev very high in gear and won't plain out 17' tracker A weak ignition or fouled spark plugs, either will limit the power output. Quick planing means more fun for skiers and tubers Mercury 50hp 2 stroke wont rev completely out in gear Mercury Outboard 70 (3 CYL outboards should be in the 140-160 degree range At idle the engine is noisier than a four stroke It also won't go into reverse Leesburg Pokemon Go Discord It also won't go into reverse. Boat Won't Go Over 3000 RPM Under Load. Mercury Outboard Cranks But Won’t Start. With ears hooked to the motor using the fast idle or by puting it in gear, it will rev up just fine. Engine May Stalls, Loss Power Or Make Excessive Vibration: Another commonly mentioned. Brought it home and hooked up the ears and it worked fine, went to the lake. While it is possible there is another issue, I would start with pulling the thermostat, and let the motor run on. If neither of those tests show where the. It should be within a range of 0. This video discusses how to fix a Mercury outboard that idles rough, stalls, hesitates upon acceleration, runs uneven or surges. Will idle but once load put on the motor looses power In gear it will run at around 2000 rpm, and occasionally rev up to 3-4000 rpm for. Outboard May Hesitates Upon Acceleration: Another common problem that Mercury 25HP four-stroke outboard users often complain about is the motor’s visible hesitation on acceleration. What you need to do next is pop a timing light on each of the spark plug wires one at a time, throttle the engine up, and see if the light flashes, or cuts out and stops. The Mercury 4hp outboard motor models are perfect for small fishing boats, small t sized inflatables and sailboat auxillary power You can run motor in neutral (rev it up) and after reving it may come back with full power You can run motor in neutral (rev it up) and after reving it may come back with full power. Another issue may be that fuel line is clogged and fuel isn't reaching the engine. I have a 1999 225 hp Mercury, carbureted outboard that frequently won't rev up under load. I have a 2004 Quicksilver 460 with a Mariner 40hp 2-stoke from the same year. Also check and clean the battery connections. Tangled Propeller; Poor Gas Quality; Clogged Fuel Filter; Fuel Hose Replacement; Faulty Impeller; Bad Spark Plugs; Malfunctioning Fuel Pump. Re: mercury 60hp wont rev past 2500rpm under load Before even thinking about buying a prop, I seriously think you need a DVA meter or a DVA adaptor for a volt/ohm meter. I checked the stator coils,primary and secondary and the 5K ohm plug cap, the trigger coil. It was topping out at 20 mph and not going over 4000 rpm. The motor stays on fine and is idling normally. June 3, 2012 at 12:34 pm #1277541. Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated,. Improper clamping between the lower and upper outboard could be one reason. Refer to carburetor adjustments . A fairly common reason for low RPM is. Check to make sure that the shifter is not in forward or reverse. Using warm up lever motor will rev. There are many reasons that can lead to issues with the fuel pump in your Mercury 115 Four Stroke motor. Read on to learn more about why your boat won’t go over 3,000 rpm under load and how to fix this problem. Fuel lines often clog if the engine is run through salty, muddy or polluted water. After several weeks of not driving the boat, over the Labor Day weekend I had several days to consecutively run it. Start by testing the spark with an adjustable gap spark tester set to 1/4 to 7/16 gap. In case this happens, there will be a constant fluctuation in the. Put the gas in my lawnmower to get rid of it and it didn't mind it so I don't think it was stale or waterlogged. All went well, except it would not go to its normal 5,000 rpm-- would only go to 4,600 rpm. If that is the case ,switch on the ignition and take out the kill cord black plastic key 4 or 5 time quickly. Before I used the boat last week the cranking battery was dead In neutral, it will spool up no problem sometimes they slip on the shaft or break off Yamaha plans to introduce new products and upgrades to models on a continuous bases instead of only at the traditional “model year change-over It is just more noticeable at lower rev ranges It is just more. If you know anybody who has a similar Merc, borrow their hose and try it. This will also happen if the idle becomes stuck or the oxygen meter indicates it needs to adjust the o. The best choice is to just pull it all out, clean everything and install new lines, filters, etc. From one day to the next my Mercury Outboard would no longer get past 3000 RPM. The reading should be between eight and eleven if it's higher. Check your anti-siphon value and also inspect for low fuel pump pressure. If I let off it goes back to trolling speed just fine. Mercury simply changed the design and put the sensor on a 45-degree angle. My mercruiser wont go over 2800 rpm under load tune up done…. Mercury Outboard Won Rev Up T. For the majority of times, these issues are related to users using bad quality fuel in their unit. If it is not resting on the throttle stop, pre-load the throttle cable barrel by rotating it 1 or 2 turns. 9HP Mercury boat motor won’t start. Motor usually starts OK and idles fine. Yesterday it started up fine we headed off 5 mins down the lake at speed and started to troll. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. Starting from idle when I hit the throttle to max, it will get up to ~ 1500 RPM and. 2)check and insure wherever cable is supposed to be bolted down by fasteners routed all the way back towards shifter that the cable has not come out of hold down allowing cable to flex 3)check where actual cable attaches at shifter controls 4)check shifter for worn linkage holes and bushings. Stator as Cause of Poor Acceleration Under Load. Replaced both plugs, still lacks power. So the issue at the moment is that it won't rev up over 2000 rpm while under load.