Boat slows down at full throttle. An Aug 19, 2005 · Re: 40 HP will not run at full Throttle. But then has the same issue of bogging down as if it is running out of gas. Took it out yesterday and hit the throttle and it did the same thing. You can do this with engine off advance the throttle to wide open throttle make sure the throttle [plates are full open and that the timing is advancing also. If you have the older style top mount, you have to remove the entire binnacle cover. The boat would not even plane. 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. I was going full throttle (35mph) and tried to slow down. The first thing to check before anything else is the mixture screws. I added new gas, and vented gas tank, but no help. 9 1/4 X 8 are available for increasing r's at WOT. If i back it off for 10-20 seconds and go back to full throttle it's okay May 25, 2012 · Hello. I have replaced all fuel filters, hoses, bulb SOLUTION: If your Husqvarna blower begins to bog down and lose power, place it on a level surface. The boat outside of the water with no strain rev's up to 6k but in the water, no more than 2k. During acceleration, I noticed she bogs down from idle thru full throttle which makes it getting out of the hole a little slow. Damaged water pump impeller: Sterndrive and inbound engines use a Jul 1, 2023 · Limited Top Speed: One of the most noticeable signs is a reduction in your boat’s maximum speed. If the bog is fixed, the engine should run smoothly, and you can get back on the water! Apr 7, 2012 · Trader Rating: 2 (100% +) Motor cuts out at full throttle. I was on the river Sunday and at full throttle the motor sputtered and stalled. After it being in a covered storage for 10 yrs, my dad wanted me to have it. If the carb float is hanging up on the gasket or the float level is not set correctly. Move the gear lever on the side of the motor to either the forward or reverse position. It is very intermittent; sometimes it won't happen for weeks, other times it happens 3 times in an hour. It could limit flow of fuel into the carb bowl. I went out Saturday and when I left the boat ramp, boat was running fine. Jul 5, 2013. Re: Mercury 115 EFI bogging down. net. BUT. Turn the AC generator rotor clockwise so that the cutouts are on the right and left sides of the AC generator rotor as shown. I put one in my boat and run the big motor and kicker through the Aug 26, 2007 · Joined. New member. Check the factory water/fuel filter separator that on the front of the engine and see if there any water or gukk in it. Re: 2003 yamaha 115 4 stroke bogs down, misses badly above idle. The on-off switch sometimes has a loose connection. 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. Bought the boat used Jun 15, 2023 · It wouldn't restart so I used the trolling motor to get back in. Pressure should remain steady from idle to WOT while under load. If anything, it's running worse. thankfully, he kept it serviced, would take it in 2x year to have oil changed and have it started and run- etc Jul 17, 2010 · Let it warm up and proceded on the lake. Outboard Not Running at Full Power | Boat Slow at Full Throttle | Boat Won’t Accelerate | Boats. Soak them in cleaner and blow out everything with compressed air. Check your carburetor for any grime or dirt and clean it thoroughly. The gas was last years but had stabilizer in it. There is a fitting on the fuel line to the injectors to attach a pressure gauge. Mar 22, 2012 · That would cut down on the air flow. <br /><br />Any throughts out there on what the Mar 27, 2012 · Messages. When the boat has a load it will run "fine" up to about 2200-2500 rpms. It begins to sputter until I either ease off the throttle or it shits off. 12-21-2012, 11:06 AM. 07-16-2021, 07:04 AM. 8. Most of the time when I ask, people will tell me they never run their engines wide open out of Sep 6, 2011 · Thanks for the reply fastjeff, Yes, I would say that I hit the reef at about 2/3 to 3/4 open throttle and the fish finder went flying off the seat and the motor bucked up but did not stall, I actually hit the kill switch on the throttle, had a good look at the prop which had a couple of dings, it looked OK so I dropped the motor back down and it started fine, so I started to open up the on the throttle grip with the projected end of the “ ” mark on the tiller handle. After about a second it goes back to full throttle. Depending on the prop type cupping etc if you change the type of prop like 3 to 4 blade, basic aluminum to SS with a lot of cup as well it gets more compliated. Clean any residue from each plug contact and plug port. Had in storage yard for the last 7 months (ever since Ivan!). If you do, disassemble the carb and clean everything. But it is handy to know as a last resort if you're stuck out on the water. Or sometime when I'm at low idle speeds it will sputter and stall. Just installed a Dynamite fuze Brushless ESC and an Orion stock brushless 17. I opened it up to full throttle and The boat speed would only reach 105. 5T motor. Mar 8, 2015 · Mar 08, 2015 10:45AM. Anyway<br /><br />Starts great, runs at low RPM's great but at full throttle will run fine then after a brief period (few minutes or so) will loss a 1000 RPM's, after another brief period returns to normal, and then again, back down, then back to normal. Mar 27, 2012. It is definingly running different. One of the most common reasons your boat may not achieve the RPM rating at WOT is the propeller. Jun 19, 2012. after about 30 seconds it shut down to about half power. First, consider the horsepower and torque requirements of your boat’s engine. Trim is stuck on the engine. If the starting system does not operate Sep 15, 2010 · Re: Mercruiser 5. It wouldn't accelerate quickly and it only reaches 29mph at 5000 RPM. Replace the fuel cap. Horsepower and Torque. Problem I have is that at full throttle the motor cuts out. Apr 26, 2011 · 7,474. It's customary to do a compression test and spark test first. Sluggish Acceleration: Another symptom is sluggish acceleration. Remote control type: Leave the fast idle lever in the “START” (fully lowered) position. If it picks up while you're pumping by hand, it's the diaphram pumps that are shot. Jul 19, 2006 · 40 HP Problems: 1. Twist it in the other direction to slow down. I can run for a bout 5 to 10 minutes untill my engine starts to bog down and will only make 3000rpms. Jun 17, 2019 · I have a 1982 mercury 80 hp outboard motor. pugo said: if your ball is going flat, sounds like your fuel tank aint venting. When driving a powerboat, a captain focuses on using the steering wheel and the throttles as the two main controls, with other equipment like tabs and drive/outboard trim being set up and then left alone. Whether you’re experiencing an intermittent bog down, poor performance, or complete engine failure, your fuel system is a common culprit. It may feel like the boat has lost acceleration or simply won’t run at full speed anymore. One of the nice, big clear plastic ones from the auto parts store is perfect. Started up to come back in and couldn't Mar 25, 2011 · It will run fine at half throttle after that. Oct 7, 2015 · I recommend not driving continuously at 85% throttle, I feel the 951 isn't robust enough for that. When the problem is happening, the motor will run smoothly at idle and at low throttle while in forward gear. If you don’t have those three things, your engine won’t be Jun 10, 2015 · Jun 12, 2015. Slow throttle opening even at full throttle. Prop is copper 42mm x 63mm. When it bogs if I back up off the throttle it idles fine again. Oct 5, 2018 · Here are his thoughts on Hesitation and Bogging Down On Applying Throttle. Move the lever to WOT in F and R, see how it feels to you. The most recent mechanic had a Checking the switch on the ESC. The pump arm should move down a bit when the feeler gauge blade is inserted. 1986 40 hp Johnson. You twist the hand grip to control the throttle. Then twirl the line between two fingers. Oct 6, 2012 · Jun 18, 2019. There are some guys on here with motors from the 30's and 40's!! Jul 18, 2011 · The correct propeller will allow your boat’s engine to reach its maximum recommended rpm (revolutions per minute) at full throttle, trimmed up for best speed, with a typical load in the boat. 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. 2. Check the fuel tank carefully for debris, and clean out or replace the fuel lines and bulb. Gave it a little throttle and that was fine. Engine won’t start or turn over. It has not been a huge issue so i have not pursued fixing it yet. #4. May 2, 2006. This is crucial to achieving the desired power and speed. The engine appears to be shaking a bit more but will stay running and re starts easily. 20. Apr 6, 2021 · I knew I was going to need to tweak my prop pitch with the 4 stroke, but I was close AND with in the specs of the full throttle 5600-6200 rpm range. Boat engine is overheating. #1. Might not be a malfunction. Carburetor Linkages: Check the carburetor throttle Aug 17, 2019 · Recently upgraded Traxxas M41 boat to leopard 4082 X2 2200Kv with Seaking ESC 180A running 6S. I have a 1984 Johnson V4 outboard with VROiling system. " Oct 18, 2010 · Oct 18, 2010. Several mechanics have spent dozens of hours each on it over the last couple years, and almost everything has been replaced, including the CDI. This could be causing this problem. Re: Engine died in full throttle, now won't start. B. I am having a problem with my 2002 Mercury 40 HP. The motor is used but the ESC is new. Df115 trouble shooting rpm/ fuel issue. Damaged fuel line. Running out of gas. DF115 runs at 10 MPH full throttle @ 4000 RPM. Before doing the actual test, install new spark plugs. Jul 7, 2022 · The manufacture WOT RPM rating serves as a benchmark of a healthy engine and if your vessel does not hit that number, it can be a sign of a number of potential issues. Re: Motor bogs down when going to full throttle. . 8,972. May 16, 2012 · Re: Motor slows down then speeds up. Remove fuel line from carb. Check the Air Filter: The most common reason why an engine bogs out under acceleration is because the air/fuel mixture is 'dirty' or inefficient. It has probably less than 25 hrs- my brother bought it new, and passed away 4 months later. 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. May 24, 2023 · Below are three factors you need to determine before selecting a throttle for your boat. You should have a small steady stream of fuel out of the hose. i changed batteries when it was doing it then it ran May 1, 2006 · 347. Tried throttle again and it will start to jurking and will cut off if I leave the throttle accelerated. Robp722 said: 1966 Johnson 9. Jul 23, 2018 · Bobs201 New Member. RPM are a good 800 ish short of what it will normally do and overall speed was 5-7 mph short of normal. 4 and timing is 0 degrees. The last thing you do before getting out on the water is reconnect all the fuel lines to the boat carburetor. I let it run for about 200 feet this way and it never picked up. 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. ESC is programmed for 6S, low voltage at 3. Nov 20, 2017 · Nov 22, 2017. it dies or else slows down and runs at high idle. When you try to Apr 10, 2005 · 2002 Suzuki DF140 4-stroke. I’m missing a third of the speed. If this is the case, you can easily get around this problem by replacing the ESC (click to learn what an ESC is), job done. Dec 21, 2012 · Tweet. Mine starts no problem but when going full throttle it will die sometimes or takes forever to get going but it never gets top speed. w. I also used Sea foam to help clear out any oil blockages which didn't help either. If you pull back slow you can get to full throttle but if you pull back to fast the motor cuts out Sep 6, 2008 · Re: I have done all that the search will tell me 74 6hp evinrude bogs down full throt clairfy this "The problem is intermittent, what happens is sometimes she will pull full throttle but then bogs down and slowly but surely shell be revving but the motion of the ocean slows down, i then back her off and she might pick up or she might not. Check to make sure you don’t have a leak on the intake manifold or the manifold side of the carb’. MPH. ChrisWilliams said: Long story short, took boat out, ran perfect up to 4200 rpm, but no higher, suspected old gas. The proper adjustment prevents the diaphragm from getting stretched to its maximum limit at wide open throttle. I found a couple of other posts on the internet with people having the same issue but there was no resolution posted. I pulled the plugs and they were wet with oil. This is a common problem and is usually caused by a sticking timer base under the flywheel or fouled, clogged carburetors, however… also check the carburetor linkages, compression, spark, and the timer base as follows. Took the cover off the motor and found that the throttle was stuck (in full Sep 12, 2023 · 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. 5, Model MQ-12A (even though it looks to be MO-12A). i've changed fuel tanks,lines checked for leaks,changed plugs. The first thing that you can do is check the switch on the ESC (If it has one). I recommend cleaning your carby the old fashioned Apr 29, 2012 · I just mentioned that my Echo handheld started bogging down and now won't run. Just bought a used 1979 15HP evinrude and when trying to run at full throttle motor revs high and boat slows way down. #18. The arm can be adjusted by tightening or loosening the screw and spring Apr 14, 2020 · Knowing how to use throttles helps a driver maximize a boat’s efficiency. Try the next time when this problem occurs to use the hand pump conecting your tank with the engine. I just bought a 1998 Mercury 40 hp outboard (serial # 0G660803, model 40M?). I'm fairly new to sim racing, but not computers. When it quits it sounds metallic like maybe the cylinders running on empty. 015 feeler gauge between the pump arm and the adjustment screw bottom. If the air filter is clogged or has a lot of dirt in it, it could be bogging down the engine. References. Supply can't keep up with high demand. While running 30kts for approx 20 min the engine loses power and will not push the boat more than 18 kts after this happens. Mar 16, 2011 · Jun 7, 2011. Does not idle in gear at slow speed. Motor kills a couple times. As a result, you will experience your outboard motor’s RPM fluctuating up and down. #5. If pressure falls of at RPM then you will need further testing and inspection of booth fuel pumps, fittings, and hoses. Was able to run all the way to full throttle and did for around 30 minutes up and down the river. S. Wide open throttle (WOT) seems to strike fear into the heart of many boat owners. I have replaced the fuel filter. Aug 29, 2010 · Bought a 2009 merc seapro 25hp last spring and ever since i've owned it when holding it at full throttle after about 20 seconds it slows down to 3/4 throttle and speeds back up in about 5 second intervals all by itself. Jul 12, 2022 · The speed at which the boat slows down depends on a number of factors, including the weight of the PWC, the amount of fuel in the tank, and the conditions of the water. Remove all your spark plugs with a ratchet and appropriately sized socket. Sep 12, 2021 · 3. To avoid it, I have to bring down the speed really slow. If the PWC is relatively light, it will slow down more quickly than if it is heavier. A very simple test is to TEMPORARILY replace a section of hose between the fuel pump Jul 18, 2013 · Jul 20, 2013. I took apart the carb and cleaned the jets. I can keep it running by letting off the throttle for a few seconds then returning to wot. #9. . Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. *** when you leave the dock, even if you have let the engine warm for 10 minutes or so, you get out and start throttling it up, there is an area of the throttle, where the boat just falls flat. Adjusted linkage at powerhead to favor full engagement in forward gear - no change 2 Jun 8, 2006 · It slows down at full throttle It runs fine until it gets warm, maybe 5-10 minutes then it starts slowing down at full throttle every once in a while until it gets progressively worst and eventually I can't get it to run at full throttle. To avoid this, always ensure that the water in your outboard engine is topped up on a regular basis. Aug 25, 2007. When these problems occur, the power generated from the outboard motor will be reduced. 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. The engine has maybe 100 hours on it and is a 2008. Watch on. In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boat’s carburetors. Open petcock. I cruise my boat around 5200RPM, about 1/2 throttle to 5800RPM or so, mostly around 5200 just above where the RAVES are open constantly. Took it home and put new fuel in it, then back on the water this weekend. Jun 7, 2014 · That's the throttle friction screw. l. 3. One of the most common ways your Yamaha outboard motor will break down is a fuel system failure. Re: Mercury (Classic) 40 hp loses power on full throttle. It doesn't want to rev out at WOT, or even get there. This motor was running great a week ago. Re: 15HP evinrude losing power at full throttle. I recently had the timing set, changed spark plugs, rotor and distributor cap. 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 changed spark plugs, marked my prop hub for slippage, bypassed fuel/water separator and gas tank with fresh fuel by connecting to the fuel pump. Feb 28, 2011 · 2. I've been through as the menus as far as I can Jun 18, 2021 · Check out these 10 simple solutions for the most common engine breakdowns. Jul 16, 2012. The 9 1/2 X 10 is the standard prop that comes with the engine. If your prop is not the correct size, pitch, or even number of blades, you may Jul 18, 2013 · At full throttle (not just the lever, but the throttle is all the way open on the carb itself), the motor runs smoothly but at about high idle speed. Try soaking the carbs in carb dip again. Jul 20, 2003 · my 1979 70 hp evinrude starts and idles great,takes off and runs fine for a little bit then slows down and starts to surge. Boat engine is sputtering and losing power. Ethanol gasoline: Only use premium low-ethanol gasoline for your Yamaha outboard motor. OK ready to take turn along with 8 other boats to enter lock, at very low speed, Much start, neutral, start, slow down, etc. If this is the problem the only fix is to take the head off and remove the metal. 5. Bought new plugs and gapped them to spec. Jun 8, 2008 · Dec 1, 2005. May 18, 2009 · I have a 89 Vision Bass Boat with a 1990 Johnson 90HP motor. Jan 20, 2010 · 8,646. 7L EFI Bogging Down from Idle to Full Throttle!!!! Come to think of it, I dont know if it will be a fuel issue bc theres plenty of gas being sprayed into the engine. Issues with the fuel system, such as dirty fuel or clogged fuel lines, could also contribute to a loss of speed at full throttle. The easiest way to do this is by eliminating the simplest explanation first and working your way outward until you locate the issue. Feb 7, 2023 · Step Six: Reconnect the Fuel Line. Check the linkage foe throttle plates opening all the way at full throttle. Just purchased used boat & motor. New plugs, thermostat, and fuel/water seperator filter. Jun 19, 2012 · New member. Had to turn the power off at ignition to get it to stop. Short blasts even full throttle for a minute or two are fine but prolonged 85% throttle this is pushing it IMO. My 2003 2 stroke 150 merc runs fine at 1/2 throttle but dies out at full throttle after about 3 mins. I came out of a no wake zone, pressed down the throttle, boat took off as always, planed out. Bring the engine to an idle and change the gear lever to neutral to stop the boat. Got to up on plane and drove it around for about 15 minutes when it bogged down at full throttle, but ran fine at slow speed and idle. Sep 1, 2021 · Fuel System Issues. May 6, 2021 · Bad carburetor. Typical symptoms of a fuel flow issue into the carb. Close petcock. You can run em without the metal. Almost like I was pulling something really heavy behind me is the best way I can describe it. Started it back up and it was reving up at 6000rpm. When I start it and run at WOT it will run good (about 30-35mph) for a brief period but will eventually bog down (engine loses RPMs and eventually shuts down despite the throttle lever being still full forward). Jun 24, 2021 · Fuel Line Air Leak. I have a 2001, 70 hp, 2 stroke VRO outboard. I've installed new prop figuring spun hub - same problem. Since you'll do both carbs (assuming compression and spark check out), the cylinder drop test is moot, but the fuel tank inspection is always a good idea. Cripes, I bought it new last fall, used it for a few cleanups and only occasionally this spring. ! or the pickup screen is plugged (oil bottle foil seal) or the fuel line from the tank to the ball is shedding it's inner tube. Feb 28, 2011. The check valves in the bulb may weep a little not uncommon to "lose prime" after a while. ,ect. Jan 20, 2010. Tighten it up to where it feels kind of snug, but not tight. Nov 23, 2017 · Nov 23, 2017. Choose the largest diameter line which fits into the tiny tell-tale hole, and thread it as far in as possible. the problem is Hi, My outboard motor slows down to idle speed after full throttle for about 15 to 30 seconds and then will pick up speed again. QUICK FIX: Ream the tell-tale, from the outside in. #3. pvanv said: Sounds like the transition circuit is a little lean. TODAY, my BACKPACK (also a PB-770T) started acting erratically. It it hard to start after shutting off and cranks similar to trying to crank it with the kill switch off. Test out your boat's operation at full throttle again. 4,087. See full list on partsvu. We stopped in the middle of the lake to check the map, but when we started again the boat was running very slow even though it was at full throttle. Use a plug gap tool to set the correct measurement on your plug gaps, according to your manufacturer. I put everything back together, all filters clean, new oil, clean plug, and fresh 91 octane fuel containing zero ethanol. Engine looks remarkably clean, but bogs down to the point of dying when I go from idle to full throttle. You've got cloggage at the tank/petcock/fuel line/carb. Gave it a little more throttle and it started to bog down. Has a little troble to stay running when cold. If your blower no longer runs sluggish and loses power once the air is introduced to the fuel tank, you most likely have a plugged fuel tank vent. Aug 30, 2022 · It usually occurs when your boat’s outboard engine overheats. The throttle was in nuetral but I was still in full speed. Jul 4, 2013 · 26. We move on and approach locks "waiting wall" slow down to 3-4 knots, put in neutral, Motor kills but restarts immediately. Re: Motor Shuts Off While Running. When motor is trimmed full down its extremely slow and sluggish and then I start trimming it up so it will pick up speed. May 7, 2016 · Motor kills once , but starts immediately. Rule of thumb is 1" pitch change (+/-) will increase or decrase rpm by 200 ish if you are staying with the same prop type. Mar 10, 2021 · Verify your tach is accurate first. The fuel is good. For sure, as BaileyBoat said, I'd be putting in a proper water\fuel separator as well. It starts and idles perfectly and will run full throttle for a minute or two after it has been turned off for 10-15 min. It won't idle for more than 2-3 minutes without bogging down and trying to stall. When servicing engines, we found this is the most common cause for a motor to bog down when hitting the Mar 17, 2011 · Mar 16, 2011. If it's a bit tight, back the screw off a bit. let it idle a bit then it will go again for a short while. Do I recommend doing this? Nope. The most obvious answer is fuel. Engine won’t shift into gear. Clean the air filter and see if the problem goes away. When I start it after letting it sit for an hour it fires right up to full speed, but after 10-30 sec. With the carbs off the engine, if you give them a gentle shake, you should be able the hear the floats rattle around inside the bowl. Jun 8, 2008. or the ball itself is kaput. When I quickly cut back on throttle, prop engages again. Here is a thought. If this is the case, then the engine will be sucking in air without the petrol vapour to ignite and so causing a ‘flat spot’. I’m not getting the acceleration or top end I’m used to. #2. HI- I have a 2007 optimax, SN- 1b473256 115 hp. Ran a couple hours at 4000 rpm, tooled around for a half day at various speeds, start and stop, ran the same. Next trip out, no change in boat load, air temps and general weather the same as the day for first 2 hours of break in. A poor O-ring seal in the fuel fitting can allow air to suck into the system, especially when the hose is flexed in turns. once she is out of the hole, she runs nicely and tops at 4200. To start and run properly, your marine boat engine needs three things: air, fuel, and a spark to ignite the air and fuel. Hi, My 2003 DF115 starts fine and runs good at slow speeds but tops out at 10 MPH and 4000 RPM at WOT. It runs fine, nothing gets hot but at full throttle power cuts off. 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. The first step is to identify what the cause of the problem is. If you notice any erosion, replace the plug. I can continue running but again at full throttle, power cuts off. Boat motor stopped suddenly. Re: Outboard bogging down under load. 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. F. Mixture Screws. Well it's back at it, I have a 2005 Mercury 60hp 2-stroke 3 cyl. That includes the fuel system in general, the fuel lines, the air filter, the fuel Jun 11, 2018 · Back to the launch, started and ran well but not superb. <br /><br />Then, put a fuel filter in the fuel line between the tank and the bulb. Twist the throttle to speed up. Jul 14, 2020 · For some reason it's get up and go power is weak. Following applies: 1. I am having an ongoing issue since I took the boat out this summer. The sympton for this situation is the motor will idle ok but wont run at full throtle. I have changed the fuel filters, had carbs Jul 5, 2012 · Insert a 0. I thought it might have gotten clogged so I checked the rotor and found no issues. The steering is straightforward, but the throttle is the vital Jun 23, 2010 · Took the boat out to the lake and the motor started up fine. Apr 26, 2011. Once all the fuel lines are connected, start the engine and let it run for several minutes. Mar 27, 2024 · Check All Fuel Lines and Filters. Before getting too deep into troubleshooting, make sure that the throttle control at the helm advances the throttle lever on the engine from stop to stop. This is a lot simpler than it sounds, as long as you have some fishing line on-hand. Aug 4, 2007. Re: Losing power at full throttle. Next, get a timing light and run the engine and hook the timing light up to each plug wire one at a time and see if the timing light flashes or not. Basically, you’re going to have to isolate the problem and try to figure out what is giving you this massive headache. Debris in the Gas. Getting a rpm reading at WOT is really needed to prop the rig out right plus engine set up on the boat has to be correct also. Jun 24, 2010 · Jun 24, 2010. Jun 2, 2023 · Why is my boat running slow at full throttle? A boat may run slow at full throttle because of a dirty or damaged propeller, overloading, or an issue with the engine itself. Nov 21, 2013 · Bummer. May 28, 2018. Dec 11, 2016 · I live in Sint Maarten where there are no real Mercury mechanics. Jul 16, 2021 · Tweet. And LOL at "classic". I thought it might be the fuel filter so I replaced that and ran it with muffs on, put it in gear and revved it up some and it seemed fine. I have AC set up reasonably well but I have an issue that I can't seem to work out. Jun 17, 2013 · It started smoothly and ran perfectly for 15 minutes then lost power - like it ran out of gas. Took it out last weekend and it started right up, idles with no problem. Re: motor runs GREAT, boat goes REALLY slow They will need to come off and be completely cleaned. Fresh fuel. Jun 24, 2012 · Jun 24, 2012. Flash means the engine is sparking when running, no flash means no spark. #6. (mostly because my hand held stopped working) Great. Off to the dealer tomorrow. If I try to push past it the engine slowly bogs down until i come back a bit on the throttle. The throttle must be able to deliver the right amount of fuel and air to the engine. Re: Bogs down at full throttle. May 20, 2013 · Sterndrive OL153367. :idea: Usually that is the symptom of clogged emulsion tubes (aka main nozzle) - the small holes on the side of tube get clogged by tacky dried two stroke when the carbs stood empty for awhile. Each time it would work again then 5 to 10 minutes later it would do the same thing. Spark test. you can check this by dribbling a little oil along the joint to see if it gets sucked in. Apr 16, 2001 · I will be cruising along at full throttle, then, without warning, and very abruptly, the motor slows down almost to a stop. Feb 4, 2022 · We hope this read offers you valuable insights into why an outboard motor may not be running at full power. Loosen the fuel cap and allow your blower to run. Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boat’s fuel line. 1. com If your engines slows down after a short while using full throttle there is the possibility that one of your carburators is not getting enough fuel. Hole shot time has at least doubled, boat feels sluggish through mid range Mar 5, 2012 · 11. One other thing: This is a used boat and used outboard. Re: 2004 Yamaha 150 4-stroke RPM/bogging down problem. Best just to buy rebuild kits and completely take them apart and clean all orifices and the jets. Mar 8, 2011 · I bought the boat used 3 seasons ago, and it has done this ever since i bought it. Classic symptom of clogged carb (s). o. Regular maintenance and troubleshooting can help identify and rectify these issues. You may find that no matter how hard you push the throttle, the engine fails to provide the expected power, causing your boat to struggle to reach its full potential. Since outboard engines are water cooled, low water levels will cause overheating and result in a beeping sound. Messages. The bulb was still firm, I cranked it up and it ran for about 30 seconds Jan 31, 2019 · Everything from fouled or corroded spark plug wires to debris in the gas can cause sputtering or loss of power. 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. If you have a relatively old fuel tank, look for any debris at the bottom. 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. Changed fuel filters a few times. There are several reasons your boat might not be getting the speed that it should. If the fuel tank is full, the PWC will slow down more slowly than if it is running on empty Jan 9, 2006 · Jan 19, 2006. Vibration from the engine prop. This WILL reduce fuel flow, and if allowed to continue can lean the upper carb (s) and burn a piston. uj ty ef fc zo qr of eb ns nf