Jun 16, 2011. #11. Re: Hesitation when giving 'er the throttle. mr.box said: I recently purchased a 1985 Chris Craft Scorpion Limited and very pleased with this purchase, but would like to get the engine running in tip-top shape. She has a 1985 Mercruiser I/O 5.7L 260hp (350 Chevy) and runs great as long as I gradually increase speed.Options. Dwight Coleman there are usually only a few possibilities if it only runs with the choke. One cause could be an air leak on the carb, head gasket, crankshaft seal. The other could be a clogged low speed and idle circuit. Since you just got the engine done I would double check the carburetor. You do want to make sure that it is set ...1. Fuel Shortage or Leakage 2. Clogged Fuel Pump Filter 3. Fouled or Corroded Spark Plug Wires 4. Clogged or Worn Carburetor 5. Debris in the Gas 7. Water Buildup 8. Low Compression 9. Bad Fuel Still Clueless on Why Your Boat Motor Loses Power at Full Throttle? Spares and Tools You Should Carry Onboard A Multimeter Could Save You A Final NoteLoose throttle linkage: For the engine to run correctly, the throttle cable needs to maintain the proper tension. A loose connection could be the answer to a lack of sufficient power. ... Over-filling the engine oil: If the engine oil reservoir is too full, it can cause oil to burn along with the fuel, creating blue smoke. You may have to empty some …Mar 5, 2012 · 11. Jul 16, 2012. #6. Re: Motor Shuts Off While Running. Well it's back at it, I have a 2005 Mercury 60hp 2-stroke 3 cyl. outboard that cranks and runs fine at idle or low rpms but when I increase throttle and boat to plane it stalls and shuts off, then is very hard to crank, if it cranks at all. I have replaced all fuel filters, hoses, bulb ... 6,319. Aug 19, 2005. #5. Re: 40 HP will not run at full Throttle. One other thing: This is a used boat and used outboard. Check the fuel tank carefully for debris, and clean out or replace the fuel lines and bulb. <br /><br />Then, put a fuel filter in the fuel line between the tank and the bulb.2. Feb 28, 2011. #1. I have a 2001, 70 hp, 2 stroke VRO outboard. While running 30kts for approx 20 min the engine loses power and will not push the boat more than 18 kts after this happens. The engine appears to be shaking a bit more but will stay running and re starts easily. I pulled the plugs and they were wet with oil.1. Jun 18, 2019. #6. IF the engine was converted from self- oiling, and the old injection ports were not, or are not now, properly sealed to keep air out, extra air will enter, will cause the engine to run too lean, and will consequently cause it to overheat and trigger s.l.o.w.Chances are the answer to your boat engine problem is somewhere on the list. Or, at the least, the list will help you identify the actual boat engine problem you’re experiencing. 1. Empty gas tank 2. Gas tank air vent not open 3. Fuel lines kinked or severely pinched 4. Water or dirt in fuel system 5. Clogged fuel filter or screens 6.Many boaters know that throttling back can save fuel. Below are numbers to show the savings possible through careful handling. To determine an average fuel usage at gallons per hour (gph), divide horsepower by 10. Therefore, a boater with a four-stroke, 250-hp marine outboard engine running at full throttle, or about 6,100 rpm, is using 25 gph.When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Outboard motor designs vary depending on make and model, but all operate on similar principles. Consult your owner's manual to check items that may be unique to your motor. Most manuals come with a troubleshooting guide specific to ... Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. The pump arm should move down a bit when the feeler gauge blade is inserted. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle.Your outboard may be stalling & running out of fuel due to three issues. Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine. There are several methods to troubleshooting a stalling outboard engine. We explore the three big issues that ...May 1, 2006 · 347. May 2, 2006. #4. Re: Losing power at full throttle. I'd also go with fuel pump diaphrams and non-return valves in the pumps<br /><br />Verify this by pumping you hand primer bulb while at full throttle. If it picks up while you're pumping by hand, it's the diaphram pumps that are shot. B. One circuit is for idle. Another is enrichment, which gives extra fuel when you twist the throttle. Another circuit gives it fuel while at a steady state above idle. The enrichment and/or the steady state circuits are not providing fuel to the engine. An internal combustion engine needs three basic things to run: air; fuel; ignition.The symptoms of a dirty throttle body include rough idle, poor gas mileage, faulty CEL codes, stalling and poor acceleration. A vehicle with a dirty throttle body experiences difficulty accelerating smoothly. Slowed and uneven acceleration ...Remove, clean, and properly adjust the carb, in order to fix this problem. Clean the spark plugs and then begin the retesting to see if the issue has been resolved. In the case of a fuel-injected engine, the injector could be partially stuck open. In this case the injectors will need to be cleaned or replaced.have a 1979 merc 700 problem is the boat runs at full throttle. have a 1979 merc 700 problem is the boat runs at full throttle and when you slow down and the go full it sounds like its starving for fuel and will not run wide open ,i pulled the carbs cleanen all je ...4,292. May 12, 2008. #3. Re: Boat won't go over 4,000 RPM's. Check your prop. See what the factory recommended size and pitch are and compare it to the one on your boat. Since yours is a ski/wakeboard boat, the previous owner may have increased the pitch for more holeshot, which would decrease top end speed.Insert a 0.015 feeler gauge between the pump arm and the adjustment screw bottom. The pump arm should move down a bit when the feeler gauge blade is inserted. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle.Hi guys, I'm fairly new to outboard motors and Im having problems with my Mercury 200hp Black Max. It overheats running at idle and low speeds. Cools fine under power. I have replaced the impeller, housing etc. Checked the poppet valve (not blocked). The tattle stream is still weak. The motor has only 9hrs since a professional rebuild, however ...First time I noticed the boat was running sluggish. Engine sounded great and normal, but took me a long time to get going. I am still learning the fundaments of trimming drive and …23-Jun-2012 ... Cruising speed is often the engine rpm that provides good fuel economy and and a boat attitude that provides a comfortable and efficient ride.Your question was - I have a 1990 sea ray 250 weekender and the boat runs super slow at full Throttle and it starts to over heat? Answer - I would be happy to help you with that. The most likely issue is a bad engine coupler. Mounted to the back of the engine, on the engines flywheel, is a component called a coupler. Jun 18, 2019. #6. IF the engine was converted from self- oiling, and the old injection ports were not, or are not now, properly sealed to keep air out, extra air will enter, will cause the engine to run too lean, and will consequently cause it to overheat and trigger s.l.o.w.Jun 18, 2021 · Check out these 10 simple solutions for the most common engine breakdowns. Running out of gas. Boat engine is sputtering and losing power. Engine won’t start or turn over. Boat engine is overheating. Boat motor stopped suddenly. Vibration from the engine prop. Engine won’t shift into gear. Trim is stuck on the engine. Oct 15, 2018 · A beeping sound could be coming from a boat for several different reasons, but the most common is because of a fuel restriction brought on from a clogged filter. A clogged filter will slow the flow of gas from feeding into the motor quickly enough. You might notice that while you are holding the throttle down, this is when you hear the beeping ... Loose throttle linkage: For the engine to run correctly, the throttle cable needs to maintain the proper tension. A loose connection could be the answer to a lack of sufficient power. ... Over-filling the engine oil: If the engine oil reservoir is too full, it can cause oil to burn along with the fuel, creating blue smoke. You may have to empty some …1. Dead Battery. A dead battery is the most common reason for a jet ski not starting. Even if you have a new battery or you’re sure the battery is charged, a dead battery is the most common problem that occurs at the start of every summer season. This is why we tell everyone that a proper winterizing process is vital.have a 1979 merc 700 problem is the boat runs at full throttle. have a 1979 merc 700 problem is the boat runs at full throttle and when you slow down and the go full it sounds like its starving for fuel and will not run wide open ,i pulled the carbs cleanen all je ...Here are a few ways to do it: Shift cargo or crew towards the side that is lifted. This way, you will redistribute the weight, compensating for the lean caused by wind. Adjust the angling of the trim tabs. As …Have a fire extinguisher handy. Due to the age of this engine you can have leaks around any or all of the gaskets. The engine has spark, compression and fuel leaving an air leak to cause the poor performance. Check the carbs for spitting fuel out the front of the carbs. Ask Your Own Boat Question Do I do this at idle or under a load?We would like to show you a description here but the site won’t allow us.Messages. 3. Mar 16, 2011. #1. I have a 2002 Mercury Outboard 115 EFI 4-stroke that sputters and stalls when I bring the throttle from high to low/idle rpms. To avoid it, I have to bring down the speed really slow. Or sometime when I'm at low idle speeds it will sputter and stall. New plugs, thermostat, and fuel/water seperator filter.#1 Two new issues have developed with my 2003 Sportster LE (carb) boat. It did not run much in the last year. Just finished a driveline rebuild on it. It has new gas, …Besides fuel, the engine needs a sufficient amount of air to run efficiently. But if the air filter is clogged, it will likely block the air, so it cannot reach the engine. Therefore, you may want to carefully clean the air filter. 10. Faulty Throttle Lever. When it comes to jet ski acceleration problems, the throttle lever is often overlooked.I have tried everything you suggested, but the motor seems to idle rough , sometimes, and somethimes will bogg when advanceing the throttle, and die. The spark is blue at the plugs. I replaced the carbs intake gasket. There sometimes is a chirp sound at idle or at slow fast idle. The motor runs good at full speed. The compression test was ...Remove lower unit.----Inspect waterpump.-----Look UP INTO EXHAUST housing and look for blockage in exhaust . Write your reply... i have a 2003 50hp mercury two stroke. motor runs great after leaving boat ramp, once i slow down to do some scouting for ducks i try get back on plane and motor has very little power. does not stall out. i have had ...You could be in the wrong mode or using the wrong key. Many jet skis will come with different riding modes or a learning key. Before you go riding, check to see if you have an “L-Key” or “Learning Key” as those will restrict take-off and top speed. Some watercraft even have the learning mode built-in and will have a light turn on saying ...Initial setting is: Slow speed = seat gently, then open 1-1/2 turns. Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just ...If you notice an excessive amount of wet and black carbon on your plugs, you may have a bad fuel-water mix. There also could be a leaky head gasket. See a technician. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. You may need to make a few timing adjustments or ...Besides fuel, the engine needs a sufficient amount of air to run efficiently. But if the air filter is clogged, it will likely block the air, so it cannot reach the engine. Therefore, you may want to carefully clean the air filter. 10. Faulty Throttle Lever. When it comes to jet ski acceleration problems, the throttle lever is often overlooked.Everything from fouled or corroded spark plug wires to debris in the gas can cause sputtering or loss of power. The first step is to identify what the cause of the problem is. The easiest way to do this is by eliminating the simplest explanation first and working your way outward until you locate the issue. The most obvious answer is fuel.Outboard manufacturers have recommended RPM ranges for their specific models. Top boat manufacturers prop their outboards with size and pitch that allows the boat to run inside the recommended limits. 7 Tips for Peak Performance. Today’s outboards are a big step forward from the units the major outboard makers produced just 10 years ago.Your outboard may be stalling & running out of fuel due to three issues. Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine. There are several methods to troubleshooting a stalling outboard engine. We explore the three big issues that ...The WOT test is done in three simple steps: 1. Find out your outboard or sterndrive's WOT rating. 2. Run your boat at WOT. 3. 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 ...The difference between the resting voltage and the voltage when the motor running on high in the water should be less than 5%. 5% of 12 volts is 0.6, 24 volts is 1.2, and 36 volts is 1.8. ... Boat Wiring. The rigging should be of a suitable gauge and in good condition. The chart below will show you what gauge the rigging lines need to be based …Step 2: Remove the outer components to access the governor of your engine. Step 3: Measure the clearance between the choke arm and control lever. Adjust it to a prescribed value by loosening or tightening the throttle cable. Step 4: Adjust the governor arm by rotating its pin. Step 5: Reassemble everything and test the mower for performance.I have 8 Horse mercury 4 stroke outboard. motor runs fine but prop seems to slip when in gear and running at high speed causing boat to move forward in a jerky fashion. slow then faster then slower et ... I have a 7.4 Merc stern drive-at full throttle accelerates slow and will lose a small amount of gear lube --if I acclerate slow works …Symptom 4: Discolored Fuel. Another way to tell if water is in your boat’s gas tank is to check the color of your fuel. If your fuel has a cloudy, murky color, then this may point to water contamination. Also, checking for the presence of water bubbles can often give you an idea of how severe the contamination is and how much is present in ...Here are the 12 most common causes of a speed boat motor losing power: Improper tilt of the outboard motor. Fuel line damage. Tank vent is bent. Clogged fuel filters. Old or untreated fuel. Leaking fuel pump. Old or dirty spark plugs. Carburetor/fuel injector issues.Check All Fuel Lines and Filters. Since a jet ski bogging down is primarily caused by too much fuel getting through the carburetor and into the engine, the best place to start is by examining every piece of machinery that is involved in the fuel relay process. That includes the fuel system in general, the fuel lines, the air filter, the fuel ...Dec 1, 2005. Messages. 8,972. Jun 8, 2008. #5. Re: motor runs GREAT, boat goes REALLY slow... They will need to come off and be completely cleaned. Best just to buy rebuild kits and completely take them apart and clean all orifices and the jets.Soak them in cleaner and blow out everything with compressed air.Feb 4, 2022 · We hope this read offers you valuable insights into why an outboard motor may not be running at full power. 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. Jan 31, 2019 · Everything from fouled or corroded spark plug wires to debris in the gas can cause sputtering or loss of power. The first step is to identify what the cause of the problem is. The easiest way to do this is by eliminating the simplest explanation first and working your way outward until you locate the issue. The most obvious answer is fuel. The proper method for trailering is to have the engine in a full tilt position and resting on the trailering support bracket, then have both trim rams pulled in to a point where the engine makes a jerking motion. At this point, immediately take your finger off of the PTT trim switch. Now, quickly and sharply, tap the PTT up button.Jun 16, 2011. #11. Re: Hesitation when giving 'er the throttle. mr.box said: I recently purchased a 1985 Chris Craft Scorpion Limited and very pleased with this purchase, but would like to get the engine running in tip-top shape. She has a 1985 Mercruiser I/O 5.7L 260hp (350 Chevy) and runs great as long as I gradually increase speed.Aug 17, 2014 · With my 70hp my boat will top out at 30mph and now i put the throttle down and it goes 9mph wide open. I can get it to 2.8 to 3.5 mph trolling speed and it runs a little rough while trolling and if i go any slower it will stall and while trolling i have to hit the choke every 15min or it will sta... How engine loading and propellers interact with vessel performance Photo credit: James & Jennifer Hamilton mvdirona.com. When troubleshooting a LOW POWER symptom, or a low RPM issue on any high performance marine diesel that uses mechanical fuel injection (meaning NO Electronics, or a true diesel that can run WITHOUT electricity), this is how we go about it (applies in 99 % of the low power ... When this occurs, there’s a constant fluctuation in the amount of fuel that’s pumped to the boat’s carburetors, and as a result, the motor’s RPMs go up and down. Regardless of your boat’s throttle setting, the presence of an …A well designed and executed layout for the cooling system, and running the boat as designed (full throttle) will keep the temperature in check. Regards, Jan. ... When the boat runs slow(ish), the inlet is fully submerged and will pickup plenty of water, but when the speed goes up and the hull gets on step, what rushes past the inlet is an air ...It is also possible to have problems with the body or other major parts of the pontoon. 1. Hull Issues. The hull of a pontoon can become worn down over time, get cracks, or fractures. If your pontoon boat has had a collision or has experienced a lot of wear, you could start to see issues with the hull.Jun 11, 2012 · Run the boat at cruising speed, the do the slow down and go to full throttle, if it bogs down go back to idle, squeeze the primer bulb and make sure the carb is full of fuel. Now try the full throttle again. If it now goes, rebuild the fuel pump and you may have to adjust the float height, but the fuel pump is most likely. Chances are the answer to your boat engine problem is somewhere on the list. Or, at the least, the list will help you identify the actual boat engine problem you’re experiencing. 1. Empty gas tank 2. Gas tank air vent not open 3. Fuel lines kinked or severely pinched 4. Water or dirt in fuel system 5. Clogged fuel filter or screens 6.May 13, 2021 · Simply twist it open and monitor your engine for improvement. If your outboard motor isn’t running at its best, check the fuel vent on your portable tank to make sure it’s open. Photo courtesy of Attwood. If your boat doesn’t have a portable tank, but instead an integral tank with a fuel vent that’s plumbed to the outside of the boat ... May 6, 2021 · Bad carburetor. Damaged fuel line. Basically, you’re going to have to isolate the problem and try to figure out what is giving you this massive headache. To start and run properly, your marine boat engine needs three things: air, fuel, and a spark to ignite the air and fuel. If you don’t have those three things, your engine won’t be ... Options. Dwight Coleman there are usually only a few possibilities if it only runs with the choke. One cause could be an air leak on the carb, head gasket, crankshaft seal. The other could be a clogged low speed and idle circuit. Since you just got the engine done I would double check the carburetor. You do want to make sure that it is set ...The WOT test is done in three simple steps: 1. Find out your outboard or sterndrive's WOT rating. 2. Run your boat at WOT. 3. 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 ...How engine loading and propellers interact with vessel performance Photo credit: James & Jennifer Hamilton mvdirona.com. When troubleshooting a LOW POWER symptom, or a low RPM issue on any high performance marine diesel that uses mechanical fuel injection (meaning NO Electronics, or a true diesel that can run WITHOUT electricity), this is how we go about it (applies in 99 % of the low power ... Chances are the answer to your boat engine problem is somewhere on the list. Or, at the least, the list will help you identify the actual boat engine problem you’re experiencing. 1. Empty gas tank 2. Gas tank air vent not open 3. Fuel lines kinked or severely pinched 4. Water or dirt in fuel system 5. Clogged fuel filter or screens 6.Aug 19, 2005 · 6,319. Aug 19, 2005. #5. Re: 40 HP will not run at full Throttle. One other thing: This is a used boat and used outboard. Check the fuel tank carefully for debris, and clean out or replace the fuel lines and bulb. <br /><br />Then, put a fuel filter in the fuel line between the tank and the bulb. A rough idle on an outboard is generally caused by a failed spark plug, a clogged or stuck open fuel injector, a clogged or dirty carburetor, or an engine that has an issue with the timing when dealing with a 2-stroke outboard. Knowing why an outboard idles rough is only the beginning, here is what you need to do to figure out why and how to ...#1 I am resubmiting this in hopes to get another opinion to my other post "Mariner 8m Carb Trouble" I wrote on 4-30-2006. I forgot to mention that in neutral I can get it and keep it running smoothly at full throttle. It is when I put it in gear and open her up that she takes off and then boggs down.Fuel Line Air Leak. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat’s carburetors. As a result, you will experience your outboard motor’s RPM fluctuating up and down.The beam of a boat is the measurement of its width at its widest point. Many ship designs have a constant beam measurement that runs most of the length of the vessel, while others may have a more pronounced taper.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, …Apr 30, 2022 · Bummer. QUICK FIX: Ream the tell-tale, from the outside in. This is a lot simpler than it sounds, as long as you have some fishing line on-hand. Choose the largest diameter line which fits into the tiny tell-tale hole, and thread it as far in as possible. Then twirl the line between two fingers. Oct 15, 2018 · A beeping sound could be coming from a boat for several different reasons, but the most common is because of a fuel restriction brought on from a clogged filter. A clogged filter will slow the flow of gas from feeding into the motor quickly enough. You might notice that while you are holding the throttle down, this is when you hear the beeping ... Neglecting maintenance can cause the engine to fail prematurely and lead to costly repairs. There are several things that you can do that may cause significant damage to your boat engine. Dry starts, excessive warm-up, slow shifting, slow planning, improper trim, aggressive driving in rough seas, and neglecting maintenance are just a few of the ...If an inexperienced driver is running full throttle and suddenly lets off on the throttle, a small boat can nose dive and may even flip over! The strain of running under constant load and high rpm means marine engines have to be built tough – really tough. That means nothing but the best parts such as forged and billet cranks, forged, billet or …Your outboard may be stalling & running out of fuel due to three issues. Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine. There are several methods to troubleshooting a stalling outboard engine. We explore the three big issues that ... Jul 20, 2013. #3. Re: 2004 Yamaha 150 4-stroke RPM/bogging down problem. Check the factory water/fuel filter separator that on the front of the engine and see if there any water or gukk in it. For sure, as BaileyBoat said, I'd be putting in a proper water\fuel separator as well. I put one in my boat and run the big motor and kicker …If you notice an excessive amount of wet and black carbon on your plugs, you may have a bad fuel-water mix. There also could be a leaky head gasket. See a technician. If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. You may need to make a few timing adjustments or ...After around 10 minutes of operation, it shouldn’t run into the same issue again. Y, 09-Oct-2014 ... If is it starving for fuel by pulling the choke plunger out it injects more, Mar 27, 2012 · Messages. 4,087. Mar 27, 2012. #2. Re: Mercury (Classi, Sep 1, 2021 · Fuel System Issues. One of the most common ways your Yamaha outbo, Here are the 12 most common causes of a speed boat motor losing po, Jun 16, 2019 · I’m missing a third of the speed. When motor is trimmed full down its extremely slow and sluggish and, 347. May 2, 2006. #4. Re: Losing power at full throttle. I'd also go with fuel pump diaphrams and non-r, After playing with the throttle by feeding it slowly after ti, The WOT test is done in three simple steps: 1. Find out your, Jun 24, 2021 · Faulty Impeller. Bad Spark Plugs. Malfunctionin, Bad or damaged propellerMisfiring in cylinders. Fu, Jun 19, 2012. #1. I am having a problem with my 2002 M, First time I noticed the boat was running sluggish. Engine sounde, 1. Jun 18, 2019. #6. IF the engine was converted from self- oiling, a, First, service your outboard motor regularly, and ch, My PROBLEM is that the boat reaches max speed/RPM's at ar, Yamaha Exciter Boat 1998 270hp model. The motors shut o, Bobs201 New Member. My 2003 2 stroke 150 merc runs fine at 1.