Outboard revs high when starting open the choke and it races full board til it dies. 1 km at full throttle, then idling, stopping and starting as normal. The only way to shut it down is to remove the gas or choke it out. Fuel Flow and Fuel Quality Problems Dec 28, 2012 · I have a 1989 TRX300fw. Start date Jul 7, 2018; O. Whitehall Wi. This is happening more often. No Start to the Engine An … When I start my engine in idle it revs up on high rpms, to m 2003 Mercury 50hp outboard revs high when started in neutr Have a 20hp mercury four stroke outboard. when i start it with the choke on and throttle 1/4 past start it fires and the engine goes(not the throttle) WOT. ,ect. in neutral). Nov 1, 2009 · i have a 94 mercury 60 hp out i have a 94 mercury 60 hp outboard we went out to the lake just a week ago and stay out most of the day started the motor to come in i thought it was going to take on its. Jul 20, 2018 · Suzuki Outboard Parts Forum; To start viewing messages, select the forum that you want to visit from the selection below. Perhaps something like a hose or fogging plug on the intake system was left off or disconnected during the winterizing process? Jun 2, 2021 · My regular mechanic has no time and I'm no wrencher, but it seems the problem is in the choke mechanism vs carb. Why Is My Mercury Outboard Motor Not Starting and How to Fix It? Your outboard motor is probably failing to start because of the following reasons: Defective Solenoid. The recommended service interval for recreational boaters is once a year or every 100 hours of operation. Sometimes it'll start, and idle for about 10 seconds, then die. The solenoid transmits Jul 7, 2014 · It revs fine while in neutral, and idles fine in gear. ukEngine won't start? Engine runs rough?Engine Stops CompletelyOver HeatingOil PressureOver Revving Jul 14, 2013 · The motor will run all day at 5000 to 5500 revs with no trouble. Jun 12, 2016 · I had a similar problem of high rev at start up. http://www. I took a look at the stamped plate on the motor says in between Customer: It starts fine, runs well, and revs in neutral with the RPM increasing. Posts: 3548. org. However, like any mechanical device, they can occasionally encounter issues and require troubleshooting. If your boat motor idles but won’t accelerate, it can be tricky to solve until you know what’s specifically causing it. 9 Yamaha 4 stroke that was not starting well - it took a more than 5 minutes of throttle to get running well at all. 11,933 Satisfied Customers Jul 14, 2012 · Re: outboard starts, goes WOT, then dies, and wont restart and let me clarify a little. It started developing issues symptomatic of a gummed up carburetor - without touching the throttle it revs up and down; when it's on the downward rev you have to increase throttle to keep it from stalling; stalls fairly quickly if you don't touch the throttle. Feb 18, 2017 · How about sticking spark advance linkage. The more advanced it is, the faster the engine will run. We’ll start with the most likely suspect for your boat throttle problems: fuel flow woes. Does not do this if I stay off plane and dont bring the revs too high. It would start for about 10 seconds and then cut off. picked up a (70’s?) johnson 9. Install the idle adjustment needle screw on the carb fully screwed in gently then 1. I'm thinking fuel related? Observations: The bulb was NOT stiff after it died one time. Chrysler Force Outboard Forum . Hello my 1982 80 hp outboard starts fine, revs fine in neutral, Tan | 40 yrs. But sometimes it drives completely fine with no noticeable issues. Eventually warning sounds. Hard Starting issue, would like some Jun 12, 2024 · I have a nice 9. Also if I leave it idling it also dies fairly quickly. Finding the high pressure f 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. High idling can be a symptom for a stuck thermostat . Any suggestions what could cause this problem. 1. Mar 23, 2010 · Re: Cant shut off motor - Revs High That's why, if you read some more posts here, there is always a warning to not rev up your engine when on a hose adapter or in a barrel, or really anytime when not loaded (e. New 1 km run. Jan 3, 2017 · Hello, I have a 2000 Mercury Optimax 225 XL that keeps revving like WOT upon start-up. I got a 1997 20 hp 2 stroke mercury engine, It will start and idle pretty well with some small adjustments but it wont rev up very high. I've used OBD and there are no faults logged or pending. IF I let it sit in neutral for 5 mins or so the revs will go back down to regular idle speed. 89 force 125 starting issue Sometimes it gets off just a tiny bit and won't allow the circuit to complete and won't start. After trying that for about 6-8 times. Suzuki is a trusted brand producing high-quality outboard motors, which are known for their efficiency and dependability. But I can still get it to start again. May 30, 2023 · Mercury 2-stroke outboard motors are highly regarded in the boating world for their reliability, performance, and efficiency. Outboards that see greater use, multiple-trip-per-week recreational owners and fishing guides, should be serviced every 500 hours. Mar 18, 2017 · Hi guys My 2006 250hp will occasionally rev up to around 1600rpm when selecting neutral from either forward or reverse. Apr 23, 2019 · About 2 months ago I went to start my Mercury Outboard 150 HP. It's only at the high end that it acts up. (best one I've had for starting), idle is excellent May 6, 2025 · My car’s rpm goes high and sometimes it works normally. In this blog post, we’ll explore common problems associated with Mercury 2-stroke outboard engines and provide detailed, step-by-step solutions for fixing them Motor kills once , but starts immediately. May 19, 2021 · My 1982 mercury 40hp 2stroke starts and idles for short time, then the motor revs high rpms by itself and I have to shut key off. I was using it a couple months ago and you could hear the engine rev up and start to go closer to its max speed pretty much out of nowhere. This comprehensive guide covers various Jan 30, 2025 · The engine takes a real long time to start up in the morning, having to make several attempts at high revs. In this case the propeller loses traction with the water and your boat doesn't move forward. prop and am having exactly the same problem and its getting worse. _____ Jun 24, 2013 · Hi There Everyone, This'll be my first post on Yamaha Outboard Parts I've got a Yamaha F115 from the early 2000's. May 24, 2023 · If it still revs too high, look at undoing the linkage from the tiller to the timer base and see if you can goofball it the timer base, pushing the cam clockwise and try it again. Oct 5, 2018 · (Hesitation/Bogging On Applying Throttle) (Joe Reeves) 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. 75 turns out from fully seated. And then the high idling returned, more persistent than ever. of course the choke will not let it open up all the way, so it boggs at a certain point. As soon as you click into neutral though, the engine immediately revs high (no higher than 2-3k RPMs though). After that the engine was normal, idling at 7-800 rpm and we took it for a test run. What we are trying to do is isolate the cause. If I leave the boat in gear at idle speed the RPM's will stay low at regular idle speed, but if I take the motor out of gear the revs will build up quickly. Have to prime bulb to start again. May 3, 2016 · 1. The only remedy is to turn off the ignition and restart the boat. When trying to high idle at about 1,000 RPM without moving the throttle further it will rev on it's own. High RPM stays around 1500 and doesn’t fall when car isn’t moving or accelerated. May 31, 2016 · Fish - friends you can eat. 11,933 Satisfied Customers 2001 Jeep Grand Cherokee 4. Aug 19, 2014 · Ok so i have a tach installed on the motor. Boat drives very smooth. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician. Feb 17, 2015 · It should be around 0 degrees (TDC). Thanks for any help. May 21, 2008 · Start date May 21 , 2008; C. When I nudge the throttle into idle or slow trolling position, the engine will rev from below 1000 rpms quickly up past 3500 rpms or until I back down off the throttle. While some outboard motor issues can be resolved quickly, others call for more involved fixes or expert assistance. Theories: My outboard hates this premium Valero gas and refuses to run on it; Something got dislodged in fuel line from the portable tank to outboard and is clogging up the works; Spark plug? (but For boat enthusiasts, outboard motors are a must, but they can be problematic if not properly maintained. So I've read through the multiple forums and everything lead toward the fuel regulator on the port side. Jul 7, 2018 #1 Is your rev counter is set correctly on the back? I've heard that Jul 8, 2011 · Hi, I have a 99 Merc 2 cycle 4 cylinder 125 HP outboard on a 17. g. while idling it is around 750rpm +/- 50rpm. from what i remember boat plans around 4000 and than can very easily hit 7000 rpm at wot. As you approach neutral, RPMs become lower as they normally should. Acts like it wants to run away Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. calgarygringo I have a 45 hp Chrysler outboard and motor starts and runs great. If I don't back off, the rpms will want to keep climbing. Its got about 500-700 hours on it. But as soon as I push forward on the throttle it bogs down pretty bad. Idle linkage on 2 strokers (my last 90 to name one) runs about TDC to 20-22 at WOT. Pull-start the emergency cord. The engine starts even revs high and then dies. Jun 26, 2015 · Scenario: you're at speed and begin to slow down/ease up on the throttle, approaching neutral. It was a torn fuel regulator diaphram. High rev in neutral 07-20-2018, 10: Nov 2, 2009 · I'm hoping someone alot smarter than me can help me with this. . 2001 Mercury Optimax 150hp idles high at start, then revs up much higher on own. Nov 1, 2018 · Suzuki Outboard Parts Forum; It then revs up to around 2000-2500 rpms on it's own and then drops down to an idle and below until it shuts off. We’ll talk about ten typical outboard motor issues in this article, along with solutions. I replaced the thermostat today as the rubber had cracked. Generally, idle is smooth and consistent at around 600rpm and will shift easily between gears, however every now and then the revs increase rapidly when going into neutral. Read less. The speed cuts in half but the engine revs high Went to around 3,000 rpm and ran OK for awhile, increased the throttle and same thing, revs go up, boat slows down. I finally had to take her down to about 2000 rpm to get her back to the marina with no prop slipping. 2002 150hp outboard mercury optimax will not run over 1500rpm alarm goes off. I had fuel come out of the air side Jun 3, 2023 · Boat owners understand the importance of having a reliable and well-maintained outboard motor for their watercraft. Jul 19, 2015 · I changed the spark plug(3) on the outboard a couple of months ago and checked the fuel and oil filters. 5 ft Bayliner. June 12, 2016 at 10:36 pm #1624144. occh Contributing Member. 1 Likes. Make sure your throttle cams line up and start line in the cam is in line with the throttle arm center. Inboard/Outboard mechanic Mercury/ Mercruiser, Volvo Penta and OMC, Johnson/Evin. 2012 -16 separate days fishing - 6 Blanks; 8 LSD, 1 conger, 13 mackerel, 1 Launce, 2 whiting, 1 red gurnard, 1 Bass, pollock Reinstall everything the same way you took it off, take pics. Motor kills a couple times. Jun 11, 2024 · Marine Generator. 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. Also, have oil dripping out of throttle bodies, as if too much oil is being injected. This happens when the rubber bushing inside the boat propeller spins independently, causing high RPM but poor propulsion. Hard Starting issue, would like some advice. I have a 2001 Evinrude 200 Ficht. Tom P. Check that the carb throttle plates are fully closed. But sometimes it is. I figured the prop hub was bad. 2. On my millionth attempt, I manually pumped the bulb. 🔷️ HERE IS PART 2 of this Mercury outboard fix. I have a 2000 50hp ELPTO Mercury outboard. If there’s a click when you’re cranking the engine, but it won’t start, then the start solenoid may be the problem. Plus I did a test someone recommended using the schrader valves. I could not see anything else wrong. Revs on start Johnson outboard revs up uncontrollably at start. I just bought it a week ago runs great except for the throdle. Got a brand new 3 blade alum. Since them the engine cuts out at high revs. Cavitation is similar to the effect you'll get when accelerating your car rapidly your tires will lose traction, revs will go up, and the car won't move forward. Had been running fine until last week when while planing off the engine would rev w/o the boat accelerating normally. This is really an easy fix you can do yourself without having to pay a mechanic. Or possibly there's a huge air leak in the intake manifold. The Engine started right up but then when I brought it back to Idle, the RPMs never came down and the engine was running at about 24 yrs exp. Outboard carbs have a small hole in the throttle plate that allows the right amount of air into the engine for idle. The other one is flat. It's a 1996 outboard motor. When high, the car stutters and almost dies off in third or fourth gear when acceleration pedal being pressed decently. Apr 26, 2015 · Check again, perhaps the throttle linkage is binding or was misadjusted, thus isn't fully returning to the idle stop. It isn't running "rough" per say, but I can't get it to go above 3-4 mph. We move on and approach locks "waiting wall" slow down to 3-4 knots, put in neutral, Motor kills but restarts immediately. With the engine just sitting idling, if you had the timing linkage disconnected from the carb linkage so that the butterflies didn't move, you could run the rpms all over the place just by moving the timing around. So I did what I always do to my two stroke outboards and pulled the carby apart and put it back together. Raising and lowering the cold start lever does not seem to encourage the revs to return to normal, but We have a 2008 (might be 2009) Tohatsu MFS20 four stroke outboard. The check valves have the clear rings one showed a kink. Jun 2, 2023 · Boat owners who have been using a 2 stroke outboard engine might sometimes experience a power loss when running their boats at full throttle. after it runs for about 5 minutes at high revs, i can put it back in neutral idle and it will not die on me, but anything before that will. it seems either a week mix or carbon build up is the normal cause and people surgest using the choke to flood the motor as the best way to stop it. 5 and it starts first pull, but revs up so high it scares me enough to turn it off Customer: 2003 Mercury 50hp outboard revs high when started in neutral? I have a 2000 50hp ELPTO Mercury outboard. After I drive around for 30ish minutes I can Customer: 90 hp 2014 Mercury outboard EFI, Starts and revs for up and down for a few seconds then revs to high RPM. it is a 145 deltacraft. However, when I apply load, the RPM drops to 2200 and won't go higher than 8 mph. 2003 Mercury 50hp outboard revs high when started in neutr. But, when you increase RPM, the engine revs with little or no acceleration because the prop begins to spin. cant figure why it rev high could blow the motor cant figure the problem can any body It not "cavitation". I tried to rev the motor up to 3000 in neutral it was giving the same sputter and misfire symptom and i let it stay steady for about 5 seconds, and then all of a sudden is was like the symptom stopped, the motor starting revving up smoothly and very quickly, and the alarm went off. You can easily destroy the engine that way. Based on what you said, that sounds like the rev limiter. Other times it'll start, idle, rev up REALLY high, then die. I decided to give it more gas by pushing on the throttle. 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. When I squeeze the priming ball I get has on tye left bottom hose. 40 yrs. When I start it it idles up high but will not do it in gear. Any ideas what might cause this? I adjusted the throdle down but it still revs up. 2001 dodge durango revs up high after starting, weather cold or warm Oct 7, 2022 · On a few occassions when the engine fires up it goes to to 2000-3000 revs, with the foot off the accelarator, the battery light stays on but when it starts rolling the revs drop down to where they should be, battery light goes off, and the car drives fine. I revved her up a couple times on the way back, but same thing would happen, revs go up fine, prop not biting, not so fine. In such situations, it becomes crucial to diagnose the problem and fix it to ensure smooth and efficient … 2-Stroke Outboard Loses Power at Full Throttle: Causes & Fixes Mar 25, 2011 · Evinrude 2000 E200FCXSSC 200 hp FICHT. Sep 6, 2023 · Took the fuel pump off and the diaphragms are good. dinghyshow. 7 V8: Idle speed is intermittently high after engine reaches operating temperature. Jul 24, 2021 · It will start and as soon as I apply throttle it dies. have you looked at the throttle linkage and butterfly to see if it is closing off to the idle position? also check to make sure the timing plate is moving with throttle goes back to idle. Jul 8, 2018 · Outboard Motors Forum. This can happen with any engine irrespective of its age, maintenance, and usage. We're currently on the water, so there's only so much we can do. I starts back up immediately and runs fine on half revs, I am thinking that fuel isnt getting through but I am not sure what to check, any help greatly appreciated. I am the 2nd owner. Once a hub is spun, there generally remains enough friction to operate at low RPM—a “get home” mode of sorts. However, like all mechanical devices, Suzuki outboard motors can experience problems and require troubleshooting. Low revs or high revs? Russell7171: Engines and Propulsion Systems: 8: 26-05-2013 07:33: For Sale: 6hp Mercury 4-stroke outboard: FSMike: Classifieds Archive: 1: 05-03-2013 06:50: For Sale: 6hp Mercury Outboard Motor: lmarrazzi: Classifieds Archive: 1: 04-06-2011 19:30: For Sale: '03 6hp Mercury Outboard: jeffbrainard Common Reasons Why My Outboard Won’t Throttle Up. Apr 16, 2013 · Re: motor revs up by itself read this and see if it makes sense 2-Stroke Runaway Explained - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts this is why people are told not to rev a 2 stoke out of water. OK ready to take turn along with 8 other boats to enter lock, at very low speed, Much start, neutral, start, slow down, etc. It took about an hour to do so but it started like a dream and then purred away. ghs nsxdmsb obwn fxymi hifks xgzwc fwi yvmyzoo blgi aghkyg