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outboard stalls at high rpm Basically, you’re going to have to isolate … 9. Throttle linkage was observed while running with the cowl off and appears to move … Idles well, although a couple of hundred degrees low. I became sensitive to this when owning an older outboard with a very strong spark that eroded the spark electrodes rapidly . I live in BC and operate the boat year round (including during cold winters) [FONT=&quot] 1 Answer I have a Honda 50hp outboard, it cuts out during fast acceleration. 1, with the boat in the water at full speed 2, with the outboard in a test tank with a test propeller on it, running at max rpm. It is still worth it to run through the other, easier fixes of your engine, before jumping to the rebuild of the carburetor. Bad carburetor. Stop for awhile and then it will start up but stall within 2-3 minutes of starting. It's not enough to simply tolerate the 2nd Amendment as an antiquated inconvenience. subdoc327 Posts: 3 Greenhorn. This extra air leans out the air to fuel ratio but raises the idle anywhere … the boat will start and idle perfect all day. While running at 2,600-RPM if the "choke" really a enrichner is depressed it stalls out as it should. we were told that there was water in gas tank. New plugs, New fuel , any ideas will help Posted by Kevin Wilson on Apr 13, 2018 1 Answer Bill Boyd Honda Master 53,816 Answers Re: outboard stalls when advancing throttle past idle speed My 40HP Merc does the same thing and I think I got it figured out. On the other side it could be an exhaust restriction. The VST and all internals are brand new YAMAHA parts. No audible alarm; I don't have a temp gauge or Command Link package so no other indication that might help. An inflight test of the Apollo 15 boom indicated that … Before you pull the carb you might try adding about 5 or 6 ounces of Berrymans B-12 fuel additive to a tank full of fuel. Well, sorta. high rpm it could run for 5 minutes (sometimes less/sometimes more), then begin to … High idles are caused primarily by too much air entering the engine after the intake. also could be the fuel pump not pumping. . I can fix that. In this article, we’ll look at these 10 common causes for a boat not being able to go over 3,000 rpm under load: Wrong kind of fuel Wrong propeller Presence of dirt and debris Dirty or malfunctioning carburetor Failing ignition system Damaged propeller assembly Poor cylinder compression Overheating engine Overloading the boat The first things you should look at trying when your boat engine keeps stalling are: Replace your spark plug Clean air box Replace gas If these easier fixes don’t work, you may want to try some mechanic … While running at 2,600-RPM if the "choke" really a enrichner is depressed it stalls out as it should. mY1990 yamaha outboard 85 2 stroe cuts off at high rpms. She accelerated but then suddenly dips down at around 17000-21000 revs, then suddenly fly away. The boat sat over winter without being fogged. This extra air leans out the air to fuel ratio but raises the idle anywhere from 100 to 500 RPM based on the amount of air. It is not always easy to diagnose the cause because there … Yamaha 150 Bogging Down at high RPM. low rpm is fine. 9 on pontoon. When it stalls, it Ask an Expert Car Questions Boat Mechanics ★ 2012 mercury optimax 90. Can’t see obvious fuel leaks. when it gets on plane around 3. They … It's possible it could be running the bowl empty, either because of a blockage between fuel pump and needle valve, or maybe the float is set too low. The first thing to check before anything else is the mixture screws. Throttle linkage was observed while running with the cowl off and appears to move … Bob Stall Price $34,000 See Important Disclosures Here Dealership Photos Interactive Media Gallery Specifications Stock Number 235226B Miles 41,841 Exterior Cherry Red Tintcoat Interior Black Drive Wheels RWD Engine V6 Transmission Automatic Last one available Price Watch Save A stalling boat engine is likely caused by: A bad spark plug. Corroded or fouled spark plug wires can also cause the outboard motor to sputter or lose power. It has been serviced and runs fine. com New member Apr 29, 2019 #1 I have a 2013 50 hp Mercury 4 stroke EFI. the mechanic and i water tested the boat with a fuel pressure gauge and test light. It’s a pain in the neck but you could check the exhaust mixer/riser. Thinking it was a fuel supply issue, I gently squeezed the primer bulb (which was firm) in the fuel line, no change. The two coil winds are optimized for different engine speed ranges and are often called the "low speed stator" and the "high speed stator". At higher power settings, it runs OK for 5-10 minutes, then starts stalling out. Bad fuel. Roll throttle up a bit, maybe 1500-1800, still stable. Engine is a 2006 F150TXR with 310 hours. . April 2021 in Boating #1. engine stalls at high rpm. Under load it runs very rough and sounds like it is missing I do not think I have a fuel delivery problem: The engine runs great at idle and above 2000-RPM, but won't run smoothly between idle and 2000-RPM, stalls when the engine speed is decreased quickly, and sometimes stalls when slowly decreased below 2000-RPM to idle. Rebuilding any engine is very labor intensive and most people simply do not do it at home any more. Mixture Screws. No alarms to signal over heating,low oil/fuel or anything , starts up okay. It seems like it is just 'bogging down'. As what you may be experiencing with a "stall" can be brought on by A word of caution. At mid rang rpm. But FP is dropping significantly. must admit my 3cyl 30hp 1992 does similar things,seems to starve at full throttle. Out of the water, It idles at start up fine and sounds a little rough but mostly OK . next is to replace fuel lines and choke pump. However, it will stall periodically. it will not build fuel pressure again unless you cycle the key off and back on. I have videotaped this. Home. com Apr 29, 2019 W [email protected]. If I throttle down, FP psi starts dropping. Check the Fuel Injection Based on some reading I've done (but not on actual repairs) it seems like the Mercury outboard ignition system has two sets of windings involved in generating the primary voltage for the spark coils. Bad airflow sensor. 04-28-2009, … The engine stalls in neutral, at idle, only. There are engine rpm "stops" for the high end too, but some just rely on using the correct prop. Squeeze the primer bulb and then it will run fine w/o stalling until the next time I stop. The mixer on my Yanmar was cast iron and as they rust from the inside, the rust creates layers which reduce the inside diameter of the riser. If you are experiencing a rough idle or your RPM is running high when idling, then there are a variety of reasons for why this could be happening. What puzzles me is it will only goto high RPM after it's cold for the 10 seconds or so. It starts and idles around 38-39PSI. net Oct 4, 2005 D [email protected]. 1988 mercury 90 2 stroke very fast idle, then stalls. To fix the problem, the boat’s engine and parts must be inspected. what do you guys suggest i do next? Hello, I have a 1988 mercury 90 hp 2 stroke 3 cylinder outboard on my pontoon. Carburetor Issues Cause Boat Motors to Stall in Idle. Damaged fuel line. The fuel air mixture screws on the side of the … It ended up being the fuel pump was getting worn and not being able to keep up with the engine at high rpm's. the … There is basically 3 ways to do this. I bought a DT2 and got it running. Does the bulb stay firm, or do you have to pump it up again to restart? This could indicate the fuel pump might not be keeping up supplying fuel to the bowl? Hello, I have a 1988 mercury 90 hp 2 stroke 3 cylinder outboard on my pontoon. The most likely reason that your two-stroke engine is stalling under load is that your carburetor is dirty or dead. It begins to sputter until I either ease off the throttle or it shits off. If your outboard is running rough but you’ve checked your fuel vent and it’s clear, disconnect the fuel line and give the outboard end of the connector a good … Bobs201 New Member. · Soda Popinski Posts: 16,685 AG April 2021 #3 Start w simple. The engine is not getting enough gas at high RPMs and typically boggs down around 3800 to 4000 RPMs. The crew noted this last condition on the incomplete retractions. Start at the battery and inspect (closely) every wire connection (both+ & -). IDLE REVES UP REALLY HIGH ON STARTING OR SHIFTING FROM GEAR TO NEUTRAL THEN DROPS TO LOW … A boat that won’t go over 3,000 rpm has a malfunctioning or damaged part. YAHAMA OUTBOARD ENGINE SURGES WHILE RUNNING. The inboard/outboard engines can have the same problem as outboard engines. When I go into towards wide open throttle it runs there for about 10 secs, the bogs and eventually stalls. Check each … Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. Be carefull with it as it can melt some … Corroded or fouled spark plug wires can also cause the outboard motor to sputter or lose power. Here are 9 common reasons why an outboard dies at idle: Carburetor issues Idle settings not configured Water in the fuel supply Clogged fuel tank vent Malfunctioning idle air control valve Fuel system issues Faulty spark plugs Fuel injection issues Damaged thermostat Sounds like it is running on only 3 cylinders. Otherwise it'll go just above an idle. It it hard to start after shutting off and cranks similar to trying to crank it with the kill switch off. Check each … Hello, I have a 1988 mercury 90 hp 2 stroke 3 cylinder outboard on my pontoon. 1. The motor start and runs fine without issue. 71K views 3 years ago FIXED my rough Idle + stall problem 900 -2000 RPM running hot 60HP EFI Mercury Outboard 2005 Four stroke engine! The engine starts fine and after …. Recently it began to loose RPM and surge. what do you guys suggest i do next? Engine stalls when throttle increased A couple of weeks ago I was taking the boat out and found that I had no power once I exited the marina. This is due to the outboard’s 1. I have ’63 Gale 15 HP 15D15B outboard that is surging at 3/4 throttle to WOT. The most likely cause of your outboard … Engine stalling in idle or low rpm (solved) Now I know how a blown manifold gasket sounds like 類 I know there could be a 100 reasons why your boat is stalling in low gear but after checking the fuel pump, fuel lines and filters, spark plugs, distributor cap, rotor, engine timing, throttle cables alignment and rebuilding the carburetor the . johnson outboard 9. Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. 3. When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic … The indicator is barberpole when the boom is extending or retracting, and will show half barberpole if the drive motor stalls. It stalls while in idle (not every… Marine Mechanic: Marine Mechanic: Marine Mechanic: Marine Mechanic: Jason, Marine Mechanic 25,417 Satisfied Customers Degree in Marine … Mercury & Mariner Outboards boat stalls at high speed [email protected]. But if the engine is in the down position, energize the … It stalls while in idle (not every time) and/or idles at a higher rpm. Certainly sounds like fuel delivery issue, maybe blocked filters restricting the flow rate, ondarvr's suggestion ( have someone squeezing the bulb as you run along) would confirm a fuel issue, if it keeps running. Outboard Suzuki 6hp 4 stroke - $1,100 . This occurs between 3500 revs , 1987 Suzuki DT140Not rated yetHi. If you want … The problem is your engine isn't going to run correctly or at all with compression numbers that low. Sometimes she will stall but not always. I turned around and went back in and the engine stalled when I brought it back to idle while trying to dock. It has gotten worse and will no longer plane out and sounds like it is missing at high RPM, under load. 2. Clogged air box. Running at full throttle at a thousand revs too low could easily be the cause of overheating on this motor. My 2003 2 stroke 150 merc runs fine at 1/2 throttle but dies out at full throttle after about 3 mins. I've cleaned the carbs, replace fuel pump, clean fuel filter, replace spark plugs. Idles @ around 5000-6000 rpm. 9. 107 PSI is the bare minimum, a healthy engine will be in the 140 to 160 PSI range. Summary. I think that pretty much puts the fuel issues to bed. It starts again on first pull and will idle,but can't go much above an idle before it starts to stall again. tried all sorts. It will always starts back up after it … DT2 Stalling High RPM. Hello, I have a 1988 mercury 90 hp 2 stroke 3 cylinder outboard on my pontoon. I have changed the fuel filters, had carbs . if this is not easy for you replace the aluminium hose from pump's outlet to the carb inlet with a clear … I'm Curious to know if anyone ever found out the issue. RPMs drop off to idle, then start surging back to prior power setting (today it was at ~4,000 RPM). It might be something as simple as the carburetor idling screw needing a small adjustment, so check that first and adjust it if needed. net Cadet Joined Oct 3, 2005 Messages 8 Oct 4, 2005 #1 It's a 1995 60 hp mercury. Or 3, outboard in a test tank hooked up to a dyno, running at max rpm. I'm Curious to know if anyone ever found out the issue. Hi I have a 4 stroke 115 hp yamaha and this engine had a complete service of 140 hrs but has a problem . Checked the water separator and no water present in the fuel. The compression is excellent had it checked when I had the VRO pump changed. Around 650 rpm. Will run fine with slow throttle all the way to wot rpm. It is not always easy to diagnose the cause because there … Check the filters or even the fuel pickup from the tank. Forums. This also means you can over-rev the engine by having the wrong prop on the boat. 5k to 4k rpm it will cruise there for a minute or two then just shut off like the lanyard was pulled. Set off from the marina at around 2500 rpm, ran for 10-15 minutes then hit the unlimited speed zone. B bulawa New member Jul 11, 2011 #4 The Yamaha F115 is a great 4-stroke outboard motor which consistently receives high marks for reliability, longevity, and performance. pull it to bits if you can and check for any dirt,you should be able to blow thru it,but not suck back. Low compression. Powered up to full throttle and got to 5500 rpm felt wonderful, then after about 10 minutes, the motor alarmed,and de-powered. 636; Start date Aug 15, 2018; S. Follow the wires everywhere … Mercury Mariner Outboard Forum 2013 Merc 50 efi alarm and stalling only at low rpm after high rpm [email protected]. Remove, inspect, clean replace and make sure it's tight. Let’s take a look at seven reasons why your outboard won’t throttle up and how to fix them: Tangled Propeller; Poor Gas Quality; Clogged Fuel Filter; Fuel Hose … Re: Boat stalls at high rpm First of all use an external tank. The sequence goes as follows: squeeze primer bulb prior to starting, will start and run fine. Problems with the delivery of any of these combustion … It doesnt matter what brand of outboard you have or whether its 2-stroke or 4-stroke. Mechanic has replaced carbs with new factory. Get rid of this problem, and you may find that your engine’s performance returns to normal. A good prop dealer will recommend a starting point and will have you try a couple of props to find the best setup for your boat. The cooling water pump turns at the same speed as the powerhead and its flow rate depends on the motor speed. It is a VERY rythmic, smooth surge that starts somewhere above 1/2 throttle and becomes more pronounced as I go to WOT. Switched out the electronic pump for a mechanical pump. 2018 Sea Hunt Ultra 211 with a Yamaha 150 4-stroke continues to bogg … Here are 10 reasons and fixes to help prevent lack of fuel to a 2-stroke engine. tank was drained twice. Why A Boat or An Outboard Will Have A High Idle In Neutral! High idles are caused primarily by too much air entering the engine after the intake. check the fuel tank vent. 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. Was running fine, until 2 weeks ago, took it off trailer, then it stalled. It will starting the first pull and idles no problem. New posts Latest activity. it seems to be lacking proper fuel at high rpms, or not retaining feul. 8-liter displacement and DOHC/SOHC designs with four valves per cylinder, providing a lighter weight and extraordinary volumetric efficiency. Check your filters, gaskets, spark plugs, and vents first, as you may luck out with a simple fix. If your outboard stalls whenever you drop it into idle, the problem usually lies with the carburetor. Any faulty or damaged parts … We do lot of water sports and skiing. starts fine. Looks like it's the switch box not … Outboard engines, as with any internal combustion engine, require air, fuel and spark to maintain adequate combustion throughout the power band. New posts Search forums. Thread starter steve. Caring for the 2nd Amendment means fighting to restore long lost rights. It'll drop all the way to around 10-15psi. What's new. When I do sudden acceleration like for skiing and pulling skier out of water she hesitates. Your engine is almost half of that.