Yamaha Outboard Bogs Down Under Load

All connections look air tight. yamaha 25hp problem but it wasn't getting enough fuel and it would fall on it's face under load. A series of troubleshooting tests chasing the reason for the engine bogging down hesitating while trying to achieve full throttle. Mercury, Yamaha, Evinrude, Johnson. Re: Yamaha 150 hpdi bogs down under load I have the 02 200 hpdi, change out the fuel water separator, small canister filter and vst tank filter. good luck hope this helps. If you give it more throttle it bog's down worse. The R-23 is a new design, not a modification of another vessel in the line. 2004 Mercury 2 stroke won't rev up under load The fuel pump seems to be pumping fine, took of the hose and saw it shoot gas. I know this has been addressed before but just to throw it out there again. Wait a couple. Cavitation seemed load dependent, none occurring with me alone on the boat, add 150 lbs and cavitation occurs unpredictably but most assuredly. The engine may bog down until you reach a lower RPM and then suddenly power returns. Was not good for the motor at all. Engine spark plugs are responsible for igniting an engine's air-fuel mixture, a process that creates engine power. Search the history of over 376 billion web pages on the Internet. Called a mechanic and ran the boat at the dock. 2-stroke bogging under WOT under full load. 4 GSI/DP Volvo Penta, 454 engine 1998 27 foot Doral, well last week I idled out of the bay which it ran just fine for about five miles then I pulled back to do a little trolling, after an hour I decided to pick it up and move to another spot and noticed that I couldn't get on plan or accelerate over 2. Every time I shift into forward, the engine dies. Problem CONDITION POSSIBLE CAUSE CORRECTION 3) Ford& Holley Only. With the bike fully warmed up, find a long straight, and install a fresh plug. Put it under load and it worked fine. Just wondering from other members that tow to and from the lake(preferably with a few good hills to compare closer) , what kind of transmission temps are. If the engine will not start when the engine is hot, the choke may be stuck in the closed position, typically due to a lack of lubrication. marineengine. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around. of gear, consider the Bravo I XS when used on 2012 and older 250 Pro XS outboards fitted with with the Verado or Torque Master gearcase. Loading Unsubscribe from Tyler Roberts? Pinpointing Problems On a Outboard Motor - Duration: 14:36. Honda BF8, 4 stroke outboard. mercury outboard stalls when i slow down fast; mercury outboard stalls when put into gear 2006; my 200 mercury saltwater stalls under load; my mercury outboard stalls out sometimes when i put it in neutral; outboard fuel injection stalls when accelerating; outboard motor runs rough then stalls and wont start; outboard motor stalls when purt. Chevy EFI Blue Monsoon engine. The R-23 is a new design, not a modification of another vessel in the line. It was winterized prior to the sale. Ran perfect with the motor in a drum of water. After sitting for an hour I cranked up to leave. Mercury outboard idles rough and/or stalls refers to when a Mercury outboard runs in an irregular or uneven manner while in neutral or out of gear. But runs fine out of the water. Do not apply the throttle to "power load," as this practice washes away the material under the end of the ramp leading to it eventually collapsing. Only way to go, if you want them to run perfectly in the spring. First, let's pinpoint exactly what's going on. Feels as it went to safe mode with no alarms or buzzers going off. When it is running, it seems like two cylinders are shutting down. If your vehicle is behaving erratically and you have problems with it running smoothly, it could be showing signs of ignition coil failure. Vehicle Won't Start or Engine Noises Main Bearing Noise. We had a pin hole in the head and under pressure it would start to collect moisture in the affected cylinder until it bogged. If I only used my boat to duck hunt I would've gone with a 2 stroke. Engine motor mounts themselves are small parts that are meant to stabilize, as well as properly align, a vehicle’s engine. In both cases, reliability is far better than it was in decades past, fuel efficiency has increased, and problems like smoky exhaust and ear-splitting sound levels are ancient history. I can tach to redline on the trailer, but as soon as the ski is in the water with resistance, I cannot tach past 5 grand. It will not get past 2000 rpm's. Ignition coils come in a variety of configurations, depending upon the make, model and year of the vehicle. I have two 225 Yamaha 2 strokes and I fog them every winter. I have a 2000 Yamaha 30hp 2-stroke on the boat. Now I can pull a skiier for about. Hey Guys, I have a 1997 Merc 4-stroke 50 hp tiller motor and while out fishing this past weekend, I hit some rough water (not sure if this even has anything to do with it) but was going full speed hit the waves then I reduced the speed, until calmer water. After reading this thread, I pulled the plugs last night and both were oily and wet. Clean your carb and spray carb cleaner in all small passages, make sure air can flow through all ports no matter how small. So, even though these mounts are small, they play a large role in the overall functionality of the heart of your vehicle. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. Long shot, but our 90 would randomly bog at higher RPM under load. Yamaha 60 4 stroke 2005 bogs over 4000rpms. Also a lot easier to start in cold weather. After sitting for an hour I cranked up to leave. Like I said on straight flat roads it pulled just fine, and even pulling it out of the water it worked great. You can test the Mercury power pack in either one of two ways; one method requires you to use a multimeter, to test the power pack directly. The problem is when I WOT the engines bog down and will stall unless I back off on the throttle. Over time it has progressed to the point now that it will not pick up at all. What could be going on? It is a 1998 Mercury 200hp carb motor. All connections look air tight. Usually happens after 5-10 minutes of run time. Engine cuts out/bogs down at higher RPM's Found that under filter was a screen that I didn't check before. Hesitation under heavy throttle: Deadspot & stumble. Out of gear she revs fine. Honda EU2000i; bogs, quits under microwave load Model numbers are gone, sorry: purchased new in 1999/2000 and used a lot since. thru under normal conditions but when you load it down with. I also put on a new fuel pump and headed to the lake today. The engine started well and sounded better. So to me it appears that it is starving for fuel. of fresh 87 oct. I replaced the fuel pump and rebuilt the carbs and it fixed it. 5 again and get good idle on 2 counterclockwise screw. No issues having the generator idled down on eco throttle, the shop vac doesn't care on startup. I need help troubleshooting a problem and I need answers to a few questions. We have a 1999 Malibu Response with a 350 cu. I wish I had shot video and had more specifics. We all know what an automatic transmission is, basically—very basically, at least—so I'm not going to bore you with the details about how it converts power. It is used to. Finally started rough then smoothed out after running a while. replace BOTH switch boxes unless you can pin the problem down to the trigger. I have a Mercury 150hp outboard and it has no power when i get a group on my boat but with 2 or 3 its great? My mercury 1500 (150hp) outboard 1977 model runs great with 2 or 3 people on my boat but when i get 5 or six people on there the motor wont rev over 2000 rpms and it bogs down really bad even with throttle wide open but the people get. few questions about the Yamaha 90hp 2 stroke 07-22-2015, 03:07 PM New Yamaha under the cowl fuel filter assy. Outboard engines are popular in small watercraft because of their light weight and wide range of size for both low and high power applications. They have the ability to pull hard and go on scorching runs, bog down deep and then scream for the surface and on into the air, which is why we don’t fight them from a static boat and trundle. Now, kicks over first time, revs great, but as soon as you release the clutch (in gear) it goes for about 3 feet, and just slowly bogs out, as if running out of gas. The side console is a compact unit yet has room for GPS and sounder on top, radio below and switch panel with dry storage inside. Home; web; books; video; audio; software; images; Toggle navigation. When I started it to head in to the dock, it bogged down under load. 0 mpg (statute) but varies between 1. Trimming the outboard down a bit during a sharp turn can help your prop maintain grip, and help your boat maintain speed. I had it towed to a. under a load, do I have this problem with cutting out and bogging down. but same, i feel the engine so rich while running low. In all cases it will rev. if that all checks out rebuild your carbs. New pump, hoses, connectors. Usually, when opening the throttle, if the engine bogs down the problem is usually a too lean situation. We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck. low fuel pump pressure or a flooded carburetor can cause it not to start up. It runs great (idle, rev) in neutral. New tempo fuel line with yamaha fittings. Went out today into the sound. I am not second guessing what was said above, I am trying to learn. I have 715 hours on these now. this hoses i bought from mercury don't last and melt internally. Only way to go, if you want them to run perfectly in the spring. Often it is a clogged fuel jet, fuel filter, etc and the rapid increase in air entering the. 50 hp johnson outboard bog down issues, 50hp johnson no fuel to carb, 99 johnson 50 carb, 99 johnson 50hp under load, adjusting the carburetor on a 1999 johnson 50 hp boat motor, carburetor adjustments for 99 50 horse johnson, how to adjust carbs on 1999 50 hp johnson, johnson 50 hp outboard carburetor adjustment. "40 yamaha" in Western Cape 40hp yamaha outboard. Filter maintenance is very important on these picky but great motors. Notice: Undefined index: HTTP_REFERER in /home/baeletrica/www/1c2jf/pjo7. Then when I went out for the third time it ran fine until I shut it down to float for a while. I idles fine and cranks with ease. The severity of the. Here are the things ive done so far. Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. I have a 99 yamaha gp800 it bogs down under a load in the water. Anything above that and they want to stall. Replacing worn, damaged or loose fitting plug wires is recommended for improving ignition reliability. html http://www. My bike runs great while riding around town in streets. I can lift the warmup lever and it will hit high rpms with no problem, but when I try to run it full or even half speed while in gear it goes for about a count of 5 and then bogs down. The lines and gas look clean. I have an issue with my 2002 Yamaha F40. I had a similar problem on a Yamaha 50HP 2 stroke. I suspect a gunged up carburettor. Then I resta. I just got done draining the fuel lines and the gas. when it is out of the water it will easily rev up to the rev limiter, but in the water if I keep it floored it will bog down, when I floor it to take off it jumps out of the hole and then I can hold it at half throttle which will get me to about 29mph. However, chances are good that the problem is caused by something other than the carburetor, such as a large vacuum leak, a lack of compression or a fuel supply problem, such as a kinked or clogged fuel supply hose. I have 715 hours on these now. Classic fuel starvation symptoms. Carburetor Troubleshooting Guide. Ran the engine the following day in Barnstable Harbor but experience continued bogging down when increasing throttle from a trolling speed. All connections look air tight. Long shot, but our 90 would randomly bog at higher RPM under load. I don't recall removing a jet that I couldn't remove with a screw driver. I switched the outboard off then restarted. However,when I run boat in the water, it coughs, sputtters and stalls just about immediately, attempting to go more than wake-speed. Thanks for the video. This is a normal event and there is no problem with this condition. And my wife loves it. I use CRC fogging spray, from West Marine. Another possible cause would be plugged exhaust (Catalytic converters and mufflers) can cause the engine to misfire or bog down under a load while trying to accelerate and may not flag a misfire code in the computer. up in gear get on plane and the bog way down. I am a new C-Dory owner, but not new to boating. But I'm on the water usually 1-2 times per week so it was worth it to me. html http://www. Computer analysis revealed 1 of 4 triggers under the flywheel that was bad, $150 dollar analysis, $10 part, $25 labor - haven't had a problem since. F225 TXRC bogging down - fuel rail pressure question my first entry where I quoted RPMs. It does have a comfortable and familiar feeling to it, but that's because of the design brilliance of Livingston, who uses proven features that work on other Ranger and Cutwater models and incorporates them into the new boat. 2004 Mercury/Yamaha 4-stoke EFI 115hp EXLPT OT812944 1950hrs. I have noticed last 3 or 4 outings that when I go to take off after Idling a short distance that it seems to bog down when I try to take off and get on plane. i noticed there was water in the water separator. I hauled it back and forth to the shop that summer more than I hauled it to the lake. I've check the comp it's fine 125 psi, plugs are ok, there's nothing in the pump. Registrations should be sent to: Jim Mclnnes, c/o Farm Bureau Insurance Co. Forgot about this Thank you all for your help. txt) or read book online for free. ok the battle continues. 2 stroke idles all day but won't rev !! Share Thread. Home Boat Design Forums > Design > Propulsion > Outboards > Mercury 70 hp bogs down at full throttle. It will explain how to use CDS data to determine what the FSM system is doing and how to use that data to diagnose an FSM related problem. Damaged or worn main bearing noise is revealed by dull thuds or knocks which happen on every engine revolution. sometimes misfires/backfires when having these other symptomsYour fuel pump. Now, kicks over first time, revs great, but as soon as you release the clutch (in gear) it goes for about 3 feet, and just slowly bogs out, as if running out of gas. 50cc Scooter Bogs Down At Full Throttle. so it CAN affect the high speed operation as well as the rest of the rpm range. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. Yamaha 50 bogging under low rpm load it will want to bog down and die. If I'm able to get it past 1,500 RPM, it will run fine again. Only on steep hills which is pretty much every turn out here in the hill country does it bog down. These adjustments require you to work in close proximity to the engine's moving parts, which poses potential safety risks. Curing 2-cycle Engine Problems: Many 2-cycle engines have problems and are sent to the junk yard before their time. If it idles OK when you choke it, and doesn't load-up and bog down, that would indicate that your 'normal' idle condition is lean, and that enrichening the. Under heavy acceleration or at high engine speeds, fuel pressure may be sufficient to allow adequate fuel flow past a partially clogged filter, which results inadequate engine performance. One thought on. Constant hesitation is covered under “surging”. F225 TXRC bogging down - fuel rail pressure question my first entry where I quoted RPMs. Before I used the boat last week the cranking battery was dead. Yet under load, the engine could bog, backfire, and run like poo. I also noticed the tachometer bouncing on me a few times. The difference in power to plane, acceleration, top-end speed, and fuel economy was nothing short of amazing according to Yamaha. The reed valve can be temperamental. 2 depending on sea state and load. yamaha outboard no spark yamaha waverunner port timing in degrees yamaha waverunner post support yamaha outboard multi function arm yamaha outboard mtor owners manual yamaha waverunner problems yamaha outboard nema yamaha waverunner pro lanyard yamaha zone 2 rx-v557 not working yamaha outboard motor retail pricing yamaha outboard motor. Constant hesitation is covered under “surging”. Outboard Motor Hesitates At Full Throttle. Yamaha Bruin 350 service manual repair 2004 YFM350 is a perfect manual, which contains a lot of information. i'm surprised that only under load it happens it starts up. Motor dies when put at full throttle and hooked direct to engine as my 115 yamaha would only get up to 3500 and starve for fuel. Start the engine, and do a full-throttle run down the straight, through all gears. Walnut St Wednesday mornings, 9 a. How hard is it to change a fuel filter on a Yamaha 4 stroke? My motor is bogging down when I try to open it up. Anything more than 2500 RPM's and it sounds like she is "bogging down". I can run it under load at up to 1,500RPM no problem. Engine cuts out/bogs down at higher RPM's Found that under filter was a screen that I didn't check before. Then, following day same symptoms and in fact even worse! If I didn't pull the throttle back all the way when it started to lose RPM's it would drop all the way down and stall. Finally started rough then smoothed out after running a while. 50 hp johnson outboard bog down issues, 50hp johnson no fuel to carb, 99 johnson 50 carb, 99 johnson 50hp under load, adjusting the carburetor on a 1999 johnson 50 hp boat motor, carburetor adjustments for 99 50 horse johnson, how to adjust carbs on 1999 50 hp johnson, johnson 50 hp outboard carburetor adjustment. Only when under sail alone and is crossing the path of the powerboat. If I give it throttle at a slow pace, I can get them to around 2000 rpm. When I pump the bulb it firms up. Carburetor Troubleshooting Guide. This banner text can have markup. Being new to boating Im struggling with trimming the motor at certain water depths, We boat in the Indian River in Florida which has a lot of shallow water, Is there a protocol or way to know when to trim all the way down or half way even at idle speeds or shallow water, I understand that in shallow water to trim up but was wondering if anyone had suggestions. Here's the deal. One person suggested that not all cylinders were firing, and another suggested that the prop pitch was to blame. 2005 Mercury 9. 41-44 psi under load. this hoses i bought from mercury don't last and melt internally. It appeared to be working itself out but then quit. Thanks for your advice. 03 Yamaha 90 2-stroke bogging down and won't plane boat-please help and I can't see if what I'm doing is working until the boat it under a load. Came with the original 1999 Johnson 50 HP, electric start/trim, remote throttle/steering. He rebuilt the carbs and still could not get it to rev past 1500RPM under a load. of gear, consider the Bravo I XS when used on 2012 and older 250 Pro XS outboards fitted with with the Verado or Torque Master gearcase. Anything more than 2500 RPM's and it sounds like she is "bogging down". Engine bogs down and quits at full throttle and/or under load. This is getting. 90 Hp Mercury won't accelerate when an outboard slacks off or dies under a load, it's the fuel system or coils but seeing how your motor has been opened up a few. It does have a comfortable and familiar feeling to it, but that’s because of the design brilliance of Livingston, who uses proven features that work on other Ranger and Cutwater models and incorporates them into the new boat. If I let off the throttle it would come back to life and then run fine if I accelerated gradually. Clogged lines will cause hard starting and bogging when the motor is hot. This condition is primarily caused by dirty air filters, but it could also result from the incorrect fitting of after-market accessories such as exhaust systems, air filter systems, or replacement carburetors of a different type or size. If I only used my boat to duck hunt I would've gone with a 2 stroke. Occasionally a little piece of something gets into the carburator and limits the flow of fuel to the jet. Backfiring during acceleration occurs when ignition takes place in the intake or exhaust instead of the combustion chamber. (We figured that out when a mechanic looked at it later). 5m rib with 25hp mercury, 4 adults and it wouldn't get up on the plane. I idles fine and cranks with ease. Yesterday I removed the sending unit from the fuel system (they need to make bigger access hatches for mature people). How to Properly Flush a 2 Stroke Jet Ski/Sea Doo/Waverunner/Personal Water Craft. If eco throttle is on, and hence the generator is idling under no load, the saw itself "stutters" when you start it up. This paragraph also applies to relatively stock engines with the original carburetor. These adjustments require you to work in close proximity to the engine's moving parts, which poses potential safety risks. 750 SX Idles Bogs Under Load Tried Everything I put it in the water and it ran okay, it starts right up and idles good, but is extremely sluggish getting out of the water. If your a member of the SM family you have heard about the finicky SOLO motor here and there. Often it is a clogged fuel jet, fuel filter, etc and the rapid increase in air entering the. Not good for the clutch or drive train. Electrical is very quick. How to Diagnose Two Cycle/Two Stroke Engines September 2, 2011 This article outlines the appropriate steps needed to accurately diagnose your two-cycle lawn equipment engines, walking you through fuel system, ignition system and compression system diagnoses. Wouldn't be able to justify the cost of a 4 stroke using it for 3 months a year. [The Evinrude 90-HP outboard] starts and runs great but under load she bogs and stalls. I pull the intake cover, crank the engine, let it run about 10 minutes to heat up, then spray until the engine nearly bogs down. When I began to come off the throttle, the engine started to sputter and die at 3000 RPM. I have neglected my poor Montauk, I let it sit too long and it was not properly winterized. There is a fair amount of water pushed up in front of the gearcase. Prior to my purchase the previous owner, a friend, said he cleaned the carbs. So the issue at the moment is that it won't rev up over 2000 rpm while under load. If I slowly accelerate it is fine, but if I floor it it bogs. But, I'm learning to sit back, set the Yamaha at about 4000 rpm- about 12-14 mph and accept the fact that this is going to take a while- but not very much effort. You can test the Mercury power pack in either one of two ways; one method requires you to use a multimeter, to test the power pack directly. At this time motor will begin bogging down - Also did it while running 10mph bow high negotiating rough water. I also put together a 2400 rpm set, using a two pole Winco generator and an 8 hp Wisconsin, and it works quite well. I have neglected my poor Montauk, I let it sit too long and it was not properly winterized. What would cause it to bog at high speed. mercury outboard stalls when i slow down fast; mercury outboard stalls when put into gear 2006; my 200 mercury saltwater stalls under load; my mercury outboard stalls out sometimes when i put it in neutral; outboard fuel injection stalls when accelerating; outboard motor runs rough then stalls and wont start; outboard motor stalls when purt. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. but under a load it bogs down. We're not talking about a knocking engine or one that idles rough or stalls. Hi, I built a jet Jon a while back and it keeps bogging at wot, it's a 15 36 with a yamaha 700 out of a waverunner 3 with a matching pump. Ran the engine the following day in Barnstable Harbor but experience continued bogging down when increasing throttle from a trolling speed. Only way to go, if you want them to run perfectly in the spring. The R-23 is a new design, not a modification of another vessel in the line. When I go to take off from a dead stop it will bog down and die unless I choke it a few times. A clogged fuel filter often results in erratic engine performance by causing an abnormal or alternating pattern of fuel flow into a vehicle's engine. F225 TXRC bogging down - fuel rail pressure question my first entry where I quoted RPMs. I have had this motor for three years and it has performed well with no issues. It will idle fine but in gear, you can only get to about 1/2 to 3/4 throttle before it starts to bog down. check fuel filter. My next step is to grab an inline spark tester and check for spark to try and Eliminate as many issues as I can. The only thing different today (and the one other time it didn't bog down) is I did not tow the boat to the marina. Wait a couple. so it CAN affect the high speed operation as well as the rest of the rpm range. When under this type of load motor slowly starts losing power until basically none. When I pull her out of water and hook up the flush hose, the RPM's are fineno issues. Wide open throttle yields no power. Power valve blown out by spitback up through carb. my outboard starts fine and when i take off runs good for 15 sec then starts to bog down. Then I started noticing problems. "There is never just one thing wrong with a boat"; -- Travis McGee, main character in a book series by John D. This is only under load. Share Thread. This morning at daylight, launched the boat, engine is a little cold nature. After putting my boat in the water some 2 weeks later, she started without any issues as normal, but now she will not exceed around 2500 RPM's under load. Here are the things ive done so far. Under heavy acceleration or at high engine speeds, fuel pressure may be sufficient to allow adequate fuel flow past a partially clogged filter, which results inadequate engine performance. It’s too early to tell how the Pro Max will work on the Z8. All chapters in the Honda, Polaris, Yamaha, Can Am, Kawasaki, Arctic Cat, KTM and Suzuki service manuals apply to the whole vehicle and illustrates procedures for removal/installation of components that are in detailed step-by-step fashion. However for the past few months, the motor has been bogging down when I try to accelerate to high speed to the point where I can barely get on plane at around 4200 RPM. Hi, I built a jet Jon a while back and it keeps bogging at wot, it's a 15 36 with a yamaha 700 out of a waverunner 3 with a matching pump. Vehicle Won't Start or Engine Noises Main Bearing Noise. Hesitation under heavy throttle: Deadspot & stumble. When I began to come off the throttle, the engine started to sputter and die at 3000 RPM. 4 GSI/DP Volvo Penta, 454 engine 1998 27 foot Doral, well last week I idled out of the bay which it ran just fine for about five miles then I pulled back to do a little trolling, after an hour I decided to pick it up and move to another spot and noticed that I couldn't get on plan or accelerate over 2. Dont Ask Returns Superhunky Answers Reader Questions: : Rick Sieman s dirt bike Q amp amp A column returns to tackle questions on the Yamaha TT230, Honda to where the bike does not detonate or. Engine began to immediately cut out above 2500 rpms and couldn't get back up on plane. May backfire or. For six years it ran great without a wrinkle. I have a 2000 Yamaha 30hp 2-stroke on the boat. few questions about the Yamaha 90hp 2 stroke 07-22-2015, 03:07 PM New Yamaha under the cowl fuel filter assy. Start the engine, and do a full-throttle run down the straight, through all gears. I'm not a certified mechanic in the least. Put it on the lake, put it under a load, and it'd bog down horribly. ) I like to put a charger on it after each outing - sometime i don't run the big motor all that much to have it keep the battery fully charged off of it. If I hurry and throttle back to idle it will stay running. 50 hp johnson outboard bog down issues, 50hp johnson no fuel to carb, 99 johnson 50 carb, 99 johnson 50hp under load, adjusting the carburetor on a 1999 johnson 50 hp boat motor, carburetor adjustments for 99 50 horse johnson, how to adjust carbs on 1999 50 hp johnson, johnson 50 hp outboard carburetor adjustment. If I gave her a little more and got up near 5000 rpms the motor would bog down and start to sputter. Spark plugs are clean - No residue. It does not bog down or smoke like it is getting to much fuel or air. I am not second guessing what was said above, I am trying to learn. 9 pro kicker No power under load. Thinking I ran over kelp or a crab pot I backed her down, visually inspected the prop, put her in reverse, and then. You can test the Mercury power pack in either one of two ways; one method requires you to use a multimeter, to test the power pack directly. Now should you like the sound of this boat (the yellow boat) but maybe a different layout, have a look at the 4. We will discuss two types of bog: the first is bog when the vehicle is accelerated from a stop; the second is bog when the vehicle is accelerated from cruise. They can answer questions for any Yamaha outboard model or horsepower. 0 mpg (statute) but varies between 1. No obvious trigger for good/bad behaviour, although it seems it may be better if put straight under heavy load after a couple of minutes warm up than if run for half an hour at a few knots/2000rpm before going to full power. I also put together a 2400 rpm set, using a two pole Winco generator and an 8 hp Wisconsin, and it works quite well. The problem is when I WOT the engines bog down and will stall unless I back off on the throttle. Used Outboards from 2hp to 350hp. I have a 2012 250 Optimax Pro XS Serial#1B882475 it has 39 Hrs on it. it was like that when i got it, so dont blame me. Out of gear she revs fine. I have a 2000 Yamaha 30hp 2-stroke on the boat. The pump runs for. We're not talking about a knocking engine or one that idles rough or stalls. Pretty scary, huh. Idles fine and can run rpm's up if not in gear. I was thinking maybe OVP, or the fuel accumulator by the fuel pump. Been thru 3 carbs. 6) If you’re trying to track down a jetting problem, don’t change your premix oil brand or the ratio. Does sound like the mixture is too lean.