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Sep 7, 2008. #1. "94 mercruiser 4.3 thunderbolt. "94 mercruiser 4.3 thunderbolt ign 4bbl can get to about 40 mph starts backfiring thru carb till i back it down to 20 or less. rebuilt carb, replaced wires, cap, rotor, fuel filter, plugs, reset timing, checked firing order, isolated wires. Will run @ 4000+ rpm in neut. all day no backfire.15hp strange loss of power. 07-01-2014, 03:04 PM. Hi All, I have a 15hp (15fhm) 2 stroke and here is the issue. Engine will start up fine 1st pull. Engine will idle fine. Go into gear and idle fine. In idle will rev up fine. However under load wont go past half power. at points with WOT it seems to try.If you are in the market for a reliable and high-performing outboard motor, look no further than Mercury. Known for their exceptional quality and durability, Mercury outboard motor...Re: 99 115 2-stroke vibrates/runs rough midrange. lugnutz426 said: This Started The End Of Last Season. Shakes And Runs Rough Off Idle And Up Worst At Around 3000 Rpm. Starts And Idles Okay. Will Run 5300 Rpm. Smoother At High Rpm. Prop Good, Carbs Rebuilt, Fuel Pump Rebuilt. 140-145 Compression In All 4. I Kill Each Cylinder Individually And ...Outboard Motors Forum. Honda Outboard Forum . 2003 225 no power under load ... 2003 225 no power under load. Thread starter britten44; Start date Sep 22, 2019; B. britten44 Member. Sep 22, 2019 #1 I recently purchased a 2003 225 with 173 hours on it. It sat for a long time. ... it should stay around half full. If not, there there may be a ...Running a boat "wide-open" has often been a topic of debate, especially on survey day. ... every marine engine has an RPM rating set by the manufacture of where your engine should be when pushed to its power limit. This is where your engine is at 100% "load" and is often part of the sea-trial portion of a boat survey. In short, pushing ...Hi, I'm new to outboard repair so some of the terms used may be a bit obscure. The motor is old Modle No E15RLCNC. The motor starts and idles fine, however it has very little power through the throttle range and will splutter and stall if not backed off. It will run reasonably well at about 1/3 throttle. It's on a 12' aluminium boat so the ...Apr 28, 2014 · Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor’s efficiency tends to decrease dramatically below about 50% load.Jun 2, 2023 · If your outboard motor dies at full throttle, it could be due to a fuel delivery issue, such as a clogged fuel filter, a faulty fuel pump, or a blocked fuel line. Alternatively, the problem could be related to the ignition system, like a failing ignition coil or damaged spark plugs. A damaged or worn-out propeller might also cause this issue.Oct 5, 2021 · The Yamaha F115 is a great 4-stroke outboard motor which consistently receives high marks for reliability, longevity, and performance. This is due to the outboard’s 1.8-liter displacement and DOHC/SOHC designs with four valves per cylinder, providing a lighter weight and extraordinary volumetric efficiency.4. Mar 15, 2010. #1. my 2000 model 50 hp mercury is bogging down when at full throttle. it cranks and idles fine. put in gear, it runs fine at idle speed. once i go to take off, it starts bogging down and won't get above 2800 rpm. it did this last week, so i drained the carbs and it ran fine. its now doing it again. i've drained the carbs 3 ...Some motors have a control device that if the motor becomes hot it reduces the rev's so not to overheat. If your motor has one of these devices it may be faulty. Finally , when the motor begins to fade pump (squeese) the primer bulb. If no change then it's most likely a temp or electrical problem. Geoff.In the water, exhaust back pressure is encountered due to the fact that the exhaust housing (housing between the powerhead and the lower unit) is filled with water. This would drag down the needed rpms, affecting ignition. Normally the clue to this type problem is that the engine starts fine on a flushette (hose), but is very difficult to start ...And today, with a full load in the boat, all but the trolling motor itself, and the new 8.9x6.5 prop that Mercury Marine said to use at 5000' I took the boat out and it hit 5400 RPM max and over 12 MPH max. Steady speeds against the wind and all was 10-11 MPH easily. Problem finally solved.Jul 13, 2014. #1. I got a 1987 mercury mariner 75 hp. It starts, idles and runs out fine up to about 3/4 throttle. But once you open the throttle all the way up it will run good for a minute or two then bog down like it's starving for fuel. Also we pumped the fuel bulb as it starred to bog down and by doing this it would clear itself out and as ...If you are in the market for a new Mercury outboard motor, finding a reliable dealer near you is crucial. A reputable dealer can not only help you choose the right outboard for you...The world can feel overpowering and chaotic. We explain why you’ve got control over more than you think. Right now, the world seems loaded with huge, way-of-life-altering events an...Outboard Motors Chrysler outboard ... FULL SITE MENU. Shop for Engine Parts; Shop for Repair Manuals; Shop for Accessories; Boat Repair Discussion Forum; Ordering Information; Order Tracking; ... No Power under load. Thread starter Smokinboat; Start date Jul 23, 2019; S. Smokinboat New member. Jul 23, 2019 #1Confirmed, 44 psi at startup and under load (2,000+ rpm), it drops slightly to 40-42 psi. I put a brand new fuel pump ($800) in last September and haven't run the boat until late April. Yesterday was the first time I was able to go wide open throttle. The new fuel pump is the Millenium assembly with duel pumps internal, PN 155215.Sep 2, 2009. Messages. 272. Sep 25, 2009. #2. Re: Boat runs great in Driveway, but stalls on water. The difference is in the water the engine is under load --- on the muffs it is not under any load. If you have not changed the prop ----> increased pitch etc., I would run a compression test and check the timing.3. Check for Leakages. Sometimes leakages inHyzon Motors plans to produce fuel cells, including a critical com Solution. a)Use Good Fuel To Oil Mix Ratio. if you are constantly having problems in the performance of your 2-stroke Yamaha outboard motor, you have to …Fuel-related issues are a common culprit when it comes to power loss in outboard motors. Here’s how they can affect your motor’s performance: Contaminated Fuel: Old or contaminated fuel can lead to engine problems. Water, dirt, or ethanol in the fuel can cause combustion issues and power loss. Fuel Filter Blockage: The fuel filter’s role ... The spacing between the upper holes is 0.7 Either way, a good solid mechanic, with a good diagnostic ability, should be able to test and eliminate these two obvious areas. It's not rocket science, after all, just an outboard motor that needs fuel, air, and spark to run. Finding that good mechanic just might be rocket science though... John: jandrewg: posted 12-08-2007 01:56 PM ET (US)Remove all your spark plugs with a ratchet and appropriately sized socket. Clean any residue from each plug contact and plug port. If you notice any erosion, replace the plug. Use a plug gap tool to set the correct measurement on your plug gaps, according to your manufacturer. Test out your boat's operation at full throttle again. The New Pro-Drive Reverse System can be retrofitted to

Nov 3, 2020 · Summary. The most likely reason that your two-stroke engine is stalling under load is that your carburetor is dirty or dead. It is still worth it to run through the other, easier fixes of your engine, before jumping to the rebuild of the carburetor. Check your filters, gaskets, spark plugs, and vents first, as you may luck out with a simple fix ...Oct 5, 2018 · Does it? Timer Base: With the engine NOT RUNNING but in forward gear, have someone advance the throttle slowly from the idle position to full throttle while you observe the timer base. It should advance smoothly throughout that travel range. If it sticks, find out why and correct that restriction.2. Wrong Propeller. Another probable reason your boat doesn’t go over 3000 rpm under load is that it has the wrong propeller. The right propeller size should be used in a boat. If it’s the wrong propeller size, the engine’s rpm will be affected. There is a relation between the propeller size and the rpm of the engine of the boat.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 …Nov 3, 2020 · One of the possible reasons why your two stroke engine is stalling when revved is because of a clogged filter. Air filters rid the air of debris before it enters the engine and its intricate parts. This debris can clog and damage the air filter over time. If the air filter is clogged, then not enough air can get into the cylinder for the engine ...

Recreational boating is a popular activity enjoyed by many outdoor enthusiasts. Whether you’re cruising along the coastline or fishing in a serene lake, having a reliable and effic...The solution is not to overlook things that seem obvious. They just might hold the keys. For successful troubleshooting: Make sure you consider all symptoms carefully. Look for the cause, not just a cure for the symptoms. Gather as much information as possible. Knowing whether an engine was at top speed when it stopped running or whether it ...This could be your problem as the fuel pumps are integral on both carbs. You may have to rebuild with proper kits and rebuild the carbs at the same time. While you are at it replace all the fuel lines and check all the wiring for missing insulation. Those motors (year classes) are notorious for poor wiring.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Engine was hard to start and idling rough at 400-500 rpms, had. Possible cause: Aug 10, 2023 · 10. Overheating. Overheating can cause a.