Yamaha outboard runs rough at idle

Yamaha outboard runs rough at idle. The good news is that the outboard actually runs, so the problem shouldn’t be hard to fix, it's just a matter of finding out what’s stopping the motor from idling as it should. Readjust the carburetor. Starts and runs perfectly for first 10-15 minutes. The running rough at low speeds is likely due to one or more jets being clogged. 07-11-2010, 10:11 PM. I turned the key off and restarted then it ran fine? Nov 21, 2013 · 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 idle speed) valve. 06-24-2013, 10:10 PM. Run for approx 10 min at 3500 rpm motor “bogs” down, did not stall, but runs at idle very rough, I can let idle or shut down for a few min & it cranks up fine, run at 3500 rpm for awhile ,than will do the same thing. Motor starts on the second pull with choke. Apr 23, 2009 · Apr 23, 2009. After changing fuel filters (small amount of water in the one one the motor) put boat in water to test run. Motor is 115 yamaha 4 stroke 2005. could be most anything but its a clasic symptom of one of your 3 low pressure fuel pumps is bad, the 225 EFI motor is a 3. After it starts it will run for a few minutes then quit. Mar 8, 2022 · 175. The motor runs rough above about 4300 rpm. When I powered back up I could only get to Run it for 20 minutes (and don’t be afraid to run it hard) to let the Marine PRO mixture work through the system. The outboard is in fine condition with low hours and starts and performs perfectly until the other day when I took the kids fishing and idled. Check compression and if that is OK (would indicate bad rings) it is probably the carb (s). it will open and close slightly to aide in idle stabilizarion. I cleaned the carbs for the third time and it remedies the idle, then after about 30 mins of run time, idle jets get clogged again. I purchased this boat in January, restoring same. I bought it earlier this year and the motor has maybe 30-40 hours on it. I use the motor for walleye fishing *****ing at 1. If the motor has sat for any lenth of time without fuel additive or a fuel stabilizer in it, the low speed jets (which are extremly small) clog up easily. 07-30-2019, 10:06 AM. The engine is an ox66 model year 2000. Runs rough at idle and has burned a few injectors. #3. 0 to 1. It will even stall sometimes. I changed all filters. If you want to fix your boat’s high idle issue, then here are the steps you need to take and the direction you need to go! May 1, 2010 · Iv got a 50hp that's drove me nuts. Sep 12, 2009 · 09-12-2009, 09:49 PM. 2001 F50 running rough. Apr 27, 2018 · I have a Yamaha 115 hp 2 stroke model 0115TLRP, (serial 6E5-L-320813), which starts up and idles, but it runs really rough with "sneezing/coughing" and smoke. boat motor that has always run great until this spring. I took it out yesterday and felt a moderate shake under load and it is running rough all together. Under power, it is smooth and strong up to it's maximum 5200 rpm on my 17' Boston Whaler Montauk. Hello all, I have an 89 two stroke 115 v4, etlf model. My 2008 F90 idles too high when it gets all the way up to operating temp. I recently bought a 17 foot Boston Whaler Montauk with a 70hp 4 stroke Yamaha outboard. 08-27-2011, 10:04 PM. <br /> a low pressure pump diaphram failure can wipe out a piston, crankshaft or Jun 11, 2014 · i have a 1988 Yamaha 40 2 stroke 3 cylinder Autolube. Jul 29, 2008 · Jul 29, 2008. When at 6, sometimes it will stutter a little and puff smoke from the exhaust. could be weak fuel pumps or it could be the TPS is failing or it could be the enrichment pump is not woking or the prssure regulator is bad or the engine is not warming up and staying rich, this can also lead to loss of fuel in #6 fuel bowl at high speeds. It runs very poorly below 2000 rpm but runs great above that point. It also runs great while under way. Turned out they crossed the spark plug wires Jun 11, 2021 · My 1998 Yamaha 25ELRW outboard runs rough at RPM below 2200. 05-07-2017, 03:19 PM. I dropped the boat off at a 5-star **** certified yamaha service center to get the starboard engine lower unit seals replaced, warranty flywheel work done Apr 22, 2009 · 2. Its chattering at idle and when you accelerate it sounds gutless and like it is only running on 3 cylinders. 2. When the engine warms up at idle, the tach fluctuates between 6 and 7. a low idle and then suddenly a higher idle and then a low idle , then "click" , "pop" and it dies . After a while of this , fuel starts to drip out while turning over. This engine has been running very rough. I have a 2000' 130 2 stroke engine. Its got about 500-700 hours on it. Let sit 15 minutes. Plugs have less than 200 (a guess) hours on them and look o. motor will start with choke on, off once started. Jun 22, 2015 · 1. 05-15-2017, 08:47 PM. have to keep fast idle around 1500 rpms to keep motor running. Aug 23, 2011 · Tweet. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Jun 27, 2014 · Yamaha OX66, running rough. Clean/re-gap plug and double check that you still have strong spark. Sometimes it will run fine for the first 30 to 60 seconds then starts surging. It almost never does it in the first ten minutes of use. Nov 19, 2005 · Nov 18, 2005. 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. You have to advance the throttle to keep enough RPM's to keep it running as well as choke it every thirty seconds or so. you should have done it BEFORE they passed the debris. there are times when the motor will catch and start with the first turn of the key. today we dive in to find the culprit of a outboard running really crappy, and the outcome really surprised me personally but was super simple and maybe simple fix Sep 2, 2013 · Yamaha 90 2-Stroke Runs Rough @1800 rpm. Hi ,I have a 25hp four stroke about a 2004 model but with hardly any hours on it. 09-02-2013, 06:34 AM. Apr 17, 2016 · 150 HP Idle Issue. It has been running fine until recently. Before understanding how the whole issue can be fixed, take a quick glance at all the causes and cure below. Compression is 100 all cylinders. Jun 24, 2021 · Faulty Impeller. 3. Here is the issue: C40TLRV, 1997 40 hp 3 cyl 2 stroke. In this video I'll go over some of the fuel Mar 24, 2017 · Have used this forum in the past to great success. Also the top rpms on this starboard engine is about 300 less than the port engine. The engine has about 10 hours on all new filters throughout the engine. I'm at the end of my rope. Will not start unless I use the priming bulb. Last spring (2011), I started having slight hard start rough idle after running to fishing spot and turning off engine for 10-45 Jun 14, 2010 · 241. I used the boat all summer and when the tank got down to a 1/4 tank is when it started to run rough this summer. I can troll with it at idle and it never stalls, just idles lumpy. Yamaha 2010, 150hp 4 stroke. Once this was completed the spark plugs were changed with NGK. I have had the boat for about 4 years and it has never idled quite right (stalls when coming off high RPM) Recently it began to loose RPM and surge. Re: yamaha 225, rough idle, hesitates on acceleration. Need some help/rough idle. If your outboard motor will not throttle up, the issue may be as simple as a tangle. Around 1400 rpm to 1800 rpm it hesitates or runs rough until above 1800 rpm. The problem I'm experiencing comes in "slow speed zones", where the motor is running at 1600-1900 rpm. Probably a bunch of crud in the bowl. Re: Video of Rough Idling Yamaha 40hp 2 Stroke. Sound coming out of smoke hole like it's misfiring. 20,066. Sep 25, 2010. it will overflow and send the debris on down the line. Injectors have been replaced twice and still runs rough. The engine will start and run, but rough at low rpms. Tweet. Ran fine the last trip out in Dec 08. This is on my 2000 Yamaha 50HP 4-stroke. <br Nov 2, 2022 · Yamaha 4 Stroke Outboard Idle Problems: 5 Reasons with Solutions. k. After running the engine the plugs are not fouled but are a bit oily. Jun 20, 2006 · Set the container on the deck of your boat and insert the fuel line and secure to make sure the end stays on the bottom of the container. Run again for 15 minutes. After some time running, idle drops and some time stalls. After I drain the seperator it will run great for about 10 minutes than goes back to rough idle and hard to start than dies when you accelerate. It nearly always does it when it's been running hard for ten minutes. Dosen't seem to effect performance, no change in RPM or speed. Now motor surges at idle and only runs at about 4000 rpm. 06-19-2011, 04:49 PM. 1. If i shut the engine down and re-start right off, this rough idle is Jan 29, 2015 · 01-29-2015, 11:56 AM. Jul 14, 2012 · 07-14-2012, 09:19 PM. The motor ran excellent for about two hours before it sounded like the motor was being choked…. Good compression. Any ideas would be graetly appreciated. I have twin 2008 F350s (new ECUs and flywheels were serviced in 2015) on my contender 31T. Dec 31, 2013 · 2. Have twin Yamaha f225's new this year. 11-08-2013, 02:27 PM. Outboards generally can idle someplace between the 550 to 950 RPM limit. Apr 21, 2023 · Tweet. Sometimes but not always stalled in idle, only when in gear. That can clearly noticed by listening the engine and also from tachometer that shows fluctuating numbers 6 and 7. Apr 27, 2011 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. I have removed, cleaned and reinstalled gas tank. Started idling rough toward end of hunting season. Re: 50 HP Yamaha, rough idle. I have been battling a stalling out problem on my Yamaha 4 stroke 225 HP engine for years now. 9 EXHY. Jun 12, 2016 · High Idle 2008 F90. Most manuals come with a troubleshooting Dec 20, 2016 · Puzzling idle issue on 6 HP yammy. Runs fine Midrange and top end. I have changed plugs, fuel filter, fuel injectors and tested compression (all around 100 psi) with no change. When accelerated it runs better. Middle bogs it down. However, it will vary in terms of your stroke type. 94' Yamaha 115 2 stroke won't idle. Clean the carburetor. Its hard to start cold once warm it starts right up in water you take off it bogs down keep crankin throttle it will finely take off run perfect on top end. Jul 31, 2003. Top and bottom plug don't change engine sound much when pulled off at idle. 9. #5. Port engine is a champ runs great, starboard has been problematic from the get-go. Clogged Carburetor. At Trinity lake, 3000 ft elevation. 05-27-2018, 10:50 PM. Rough, coughing idle that would stall after a few seconds. On first outing in 2010 while at WOT for about 5-10 min (after running fine at idle and during trip out to the fishing grounds), engine suddenly bogged down and Aug 20, 2018 · This unit has the HT leads that run straight out of the bottom of the coil, so unable to do a simple test, Beginning to think I am getting an intermittent spark on cylinder 2 (blacker plug), which may be causing the rough idle. Very rare case it will stall and start right back up. Like the choke plate was partially closed…. . at idle most all the air the engine is burning comes through the ISC valve. 04 yamaha 4 stroke vibrate stalls at idle. Timeline: Idled for quite an extended period of time (fishing) on the second to last run of the season and noted she seemed a bit rough by the end. 05-28-2015, 04:59 PM. Re: Rough Idle F90 4 Stroke EFI. I have changed the plugs several times but it seems the problem is elsewhere May 6, 2008 · 225 ox66 1998 rough idle and high speed surging. After a few stalling cycles the motor Dec 26, 2009 · Messages. Have a digital gauge. It could give you an indication of which carb or cylinder is causing this condition. Often turning it off and restarting it will fix the problem. last year it ran good , but. I am having the same concern with my 300 hpdi stalls cold and smokes excessive at cold idle. My original symptom was the motor ran great when cold and I could go all day at 4500 rpms; but, when I came back to the dock it would idle erratically and stall. Smoke does not go away after running. And, you should know why your outboard will have higher idle in neutral! Along with that, the vital issue is where you want the engine to idle. They can answer questions for any Yamaha outboard model or horsepower. Eventually you should take carb off to clean bowl and main jet. Removed high speed tubes, idle valve before soaking. Re: 2008 Yamaha F150 running rough. At up to around 1500 it idles rough but after that start to smooth out and runs fine. Removed Yamaha spin on fuel filter, dumped in clean bucket to check fuel, removed/checked new plugs, checked fuel pumps again and Dec 8, 2019 · You replaced the plugs recently, but now they're all fouled. May 27, 2015 · A friend of mine has a 2005, Yamaha 150Hp four stroke. After you finish the cleaning treatment, add Marine Jul 19, 2010 · 2006 f225 running rough at idle 07-19-2010, 08:40 PM hey everybody. it will continue like this for some time then i'll regain rpm and normal fuel burn. #1. Yamaha 130 2 stroke running rough at low speed. My 1998 Yamaha 2-Stroke starts easily and will idle and ***** all day long. 41K views 2 years ago. I am the 2nd owner. It runs great at just about any speed except low idle / in gear (out of gear, no issues). My boat partner started noticing a slight shake or vibration the last time he used it. I recently rebuilt (cleaned) the carbs due to poor running conditions. Aug 14, 2021 · Have a 2016 Yamaha 150 with 350 hours. May 16, 2015 · 05-16-2015, 10:02 PM. simply cannot put 5 pounds of sheet in a 2. The one tell tale sign of something wrong is the port side middle cylinder's spark plug shows no carbon/oil/or use. The boat has an issue when idling in neutral. could there be an intake air leak that affects idle at low rpm? any help would be Mar 12, 2020 · F115 Rough at All RPMs. no change in performance, talked to two local yamaha dealers , said to try yamalube ring free fuel additive , runs worse now , seems like it is starving for fuel , slugish take off , slow top end Once back together properly the system was now holding prime and no leaks from fuel pumps. 09-01-2019, 07:27 AM. I have a 9. Debris such as fishing line, excessive seaweed, beer can rings, or nearly any other material can wrap around the propeller and its spindle. Wet, black plugs would indicate that the mixture is too rich. Apr 22, 2012 · Went to the lake yesterday my yamaha wouldnt plain out, no power. Apr 23, 2014. Brought it home to do annual maintenance. Checked the shrader valve with gauge and have the high pressure displayed on my lowrance hds12. 2004 f150 rough idle. Jun 7, 2010 · I have a 1985 Yamaha 150 HP, Model 150ETLK. If I turn the idle up a bit it will run, but then next startup on cold motor the idle is to high. also has a very rough idle while in Share. Dirty Filters. they do wear out after so many years. However once he comes off plane and goes to idle the engine runs rough and acts as though it's not running on all cylinders. I replaced o2 sensor, all low press pumps, VST filter, engine Aug 30, 2015 · I have a 2004 Yamaha F115 four stroke that has me baffled. Also vibrates at idle. 5 pound container. 136 hrs run time. The engine will start and run and idle great on muffs. Problem…i'm loosing power at higher RPM…i normally run 42-4400 rpm buying 12-13 gph. Then after choking it out to keep it going ,as soon as i let go of the choke she starts to die. Have had a continuing prob with 2002 90hp Yamaha-. I have a 2005 150 HP Yamaha carburated motor. Consult your owner's manual to check items that may be unique to your motor. p. Itll start but then wont run without choke. I filled the 30 gallon tank and I also put a can of SeaFoam in which is a stabilizer. Bad Spark Plugs. Every once in a while it will start to run rough at any speed and then smooth right out, some times you can go wide open and it runs fine then the next time before you get to full throttle it will start to Jul 29, 2014 · 2006 F90TLR Idle Problem. Re: Yamaha 225, rough idle, stalls, surge. Nov 18, 2011 · It basically the ethanol clogging the idle jets. Sep 25, 2010 · 61. I noticed it was idling rough. It accelerates and cruises just fine up to this rpm, but attempting to accelerate beyond this rpm results in the engine sounding like it's hesitating or misfiring and fluctuating between about 4400 and 4800 rpm. Last time I had the boat out it ran excellent besides one hiccup (misfire/running rough for about a minute) This time took it out and it was hard to start but ran like a clock above 1500 RPM but at low idle it'd be rough and die. Finally had to bring her back in at idle, clicking the choke Jul 11, 2010 · Rough running 90 hp two stroke. Very well maintained, has 527 hours. Re: 2 stroke outboard starts but then dies when throttled or idle. Jun 14, 2010. i currently have a 2006 f225 that will make intermittent growling noises at 500 rpms(*****ing). Malfunctioning Fuel Pump. Ok after cleaning the iac valve, testing the tstat, replacing the plugs, and installing new fuel lines and primer bulb. My 1999 F40TLRX has never run real good. Motor is a 2006 Yamaha V150TLR. Dec 23, 2020 · Yamaha F150 idle and stalling. Jun 7, 2021 · When it first starts and it runs ok the ignition is being retarded to 5° BTDC. I have a 2004 Z150TXR the motor has never given me any problems until now. Hi all, I am new to the forum and have a 2002 Yam 115 EFI 4 stroke on a 02 hurricane 19 ft deck boat. 115 HP Yamaha 2006 fuel injected 4-stroke. 07-29-2014, 10:15 PM. Before Have a 2000 Yamaha 150 ox66. Jun 15, 2010 · Re: Yamaha f115 4 stroke rough idle and stall. May 7, 2017 · Tweet. First off, thanks for any help you all can provide. On some days it runs good and on other days it runs very rough at idle and when throttled up it only ramps up to approximately 2,000 RPMs then Jul 31, 2003 · Jul 28, 2003. Could be as simple as some dirt stuck in the float. Filled with fresh gas and primed engine will idle fine but when put in gear goes rough and dies. Hi everyone from the UK. Watch the video above or read on below to learn how to identify and fix problems with an outboard that won’t idle properly. Jul 24, 2021 · Posts: 3,328. at wot its open 100% and about 60% at idle. If you pump the throttle the motor gains rpms only to die down again. Normally you can't tell the thing is running, but a couple times per trip it will develope a rough idle (noisey and shakes). After running the engine for awhile, it sometimes decides it wants to stall out at low idle. It has 1950 hours and has been maintained regularly. I have a 1989 Yamaha 50hp, 3 cylinder, 2 stroke (6H5 L 511690 D) which starts straight away but will cough and die after about 30 seconds as seen in the first video. I have replaced VST filter and cleaned VST, Cleaned May 8, 2024 · Yamaha Outboard Forum; If this is your first visit, be sure to check out the FAQ by clicking the link above. This engine has 4 cylinders. This only happens after som time running. all of this happens in about 10-13 seconds Mar 28, 2006 · 20,066. May 28, 2018 · F40tlrx runs rough between idle and 3000 rpm. When you pull that hose, the fuel pressure increases. Note the running after you pull each wire. Recently had fuels pumps replaced to correct a problem with the starboard engine cutting out at higher speeds. After a few hours of *****ing the motor just stalls. New fuel pump is about $50, very easy 2 screw replacement. 05-06-2008, 06:47 PM. 10-05-2015, 09:01 AM. Engine was hard to start and idling rough at 400-500 rpms, had to advance neutral start to 1000 rpms to keep engine running. Didn't investigate that much on water. Carb disassembled, soaked and new parts kit put in it. When you lower the accessory throttle handle (703) and go to put in gear it will die. Ever since I've owed it the motor has a "lumpy" idle. F150a. I have a 2003 OX66 seriesII, 250 hp. Rough Running: Start up from cold is relatively easy - the auto choke function does not seem to operate yet it starts regardless with a touch of fast idle added on the control unit (ambient temp is around 60-65 degF). Jun 2, 2011 · Jun 2, 2011. Got the boat out for first time this year. I would lean towards a bad ECU or a faulty ECU ground. I’m a second owner of a YAMAHA 150 HPDI (Z150TXRZ) outboard engine that is giving intermittent trouble. Outboard motor designs vary depending on make and model, but all operate on similar principles. I bought it new. Above that it runs smooth and has plenty of pep, gets right up on plane. Faulty Carburetor. I have changed the plugs and gapped them. Try pulling off one plug wire at a time, replace it then pull off the next one. I have a 2000 200 EFI that starts great but runs rough through all rpm ranges and smokes something fierce at all rpm ranges. I have been able to get it to run reasonably well for awhile by draining the fuel bowls and squirting carb cleaner into the bowl drain holes watching for debris. When you have to choke it, it runs rough, poofs some blue smoke and then idles for about thirty seconds, then start Jan 7, 2012 · 25 hp 4 stroke running rough. At this point, the boat would start up, would idle initially until it reached operating temperature, and then would run rough with idle. It will usually start right back up and start surging again. Hey guys! I had a local marina service my engines this summer and they changed my spark plugs. Alarms go off because of overtemperature or an oil related problem. I have a 2002 suzuki 70hp 4 stroke, hte engine idles rough and when you go past idle it dies. 115 HP runs rough. 04-21-2023, 06:57 PM. Most of the time it wont start on the first turn of the key and then I have to give it some throttle and keep the starter engaged for a couple of seconds to get it to start and then the idle is really poor. We ran down the lake about 10 miles. Also similar fluctuating can be noticed with higher rpms about 1500-2500 (in neutral). Turned the key off then restarted and it ran fine for a few hrs then the same problem happened again. Drain all the old gas out of the carb bowl. usually goes away above 800 rpms. It's been very well maintained by previous owner. Cranks up & idle’s fine. 02-21-2011, 10:37 PM. Seems like the timing is off. if i drop fast idle and put into gear quickly it will stay running but if i give it any more throttle than 1500 rpm it floods out and dies. New line from tank to engine. Dec 31, 2013. 1st trip out this year after winter storage. Used more in winter. Re: Yamaha F75 idle issues. My yamaha 250 starts great runs great in top speed but it vibrates and rattles in low idle in gear. Hi all, could anyone explain why the following could be happening. no carbon at all. once started it idles VERY rough . It starts right up but idles rough and shakes until the RPM rises above 2200. Apr 9, 2012 · I need advice. It has gotten worse and will no longer plane out and sounds like it is Jun 13, 2010 · Ruggybuggy said: I have a 2004 40hp Yamaha that's new to me this year. My yamaha 150hp 4 cycle idles well and runs well above 2000 rpm. Did this procedure today on the engine and it enabled the tickover to be May 18, 2014 · 25 hp 4 stroke runs rough other than idle. If the pressure is correct to begin with, disconnecting the sensing hose should only cause it to run a bit rich (but not die). Need help!! I have a 1998 225hp ox66 SWSII with new power head (new rings) the engine runs rough below 3000 rpms and surges 200 rpms up and down at 3600 rpm and above and surges rapidly when around 5200rpms. A thermostat stuck open causes poor running as the engine never gets to operating temperature. May 8, 2024 · Yamaha Outboard Forum If this is your first visit, be sure to check out the FAQ by clicking the link above. Jul 4, 2013 · 06 HPDI 250 / Hard starting & poor idle. Aug 10, 2009. After rebuild/cleaning the carbs, motor now runs great at all rpms except at idle. what your describing is a lack of fuel in the cylinder,I see it a lot. This past weekend it was running fine. I've got a 175 that idles rough, and dies in neutral. Excess fuel could also increase the amount of unburned fuel in the oil. Neutral idle of Yam F100 -06 fluctuates between 600-700 rpms. To start viewing messages, select the forum that you want to visit from the selection below. The boat runs like a scalded dog but wont idle for nothin. If I place 2 fingers over carburetor intake it will run fine. Production date 07/12. May 21, 2011 · Fixed sending unit and only used a one more time in 2009 and had the same problem as in 2010 once, but ran fine for the rest of the trip. Apr 22, 2009. Motor starts up and runs great, idle is 700rpm and *****ingspeed 550-600. The bog lasts just a second, and then it runs fine all the way up through full throttle. dies at 3500 rpm. May 25, 2019 · New member. Messages. I was running at 4500 rpm and throttled back to make a turn. Kept fuel topped off and stabilized over the 4 month storage period. In gear, it idles rough (and sometimes dies) and there's a slight hesitation (bog) when first accelerating. Nov 17, 2011. Aug 9, 2020 · Diagnosing a rough running four stroke Aug 31, 2009 · Aug 31, 2009. Pump up bulb and start outboard with earmuffs and water hose, of course -run a little above idle for 15 minutes and turn off. Especially the ‘rodbolt’ adjustment for the TPS and butterflies. Let sit for 15 minutes. Fuel system issues can cause causing a rough running outboard. I have been told this unit has a separate section for low RPM range and high rpm Find and Fix your Outboard fuel system problems. The carburetors have been cleaned and the fuel pump was rebuilt. fuel rich. Idle seems a little rough with occassional misfires but idle holds around 900 rpm and no stalling/cut out. Rough idling, surging and unable to reach full RPM. I have a 2003 Yamaha 200 HP OX66 EFI (VX200B) that has never given me a problem. It seems to smooth out at 1000 rpms. It looks like a gel and also a white chalky substance inside of the carb. not 100% ! Started it up 1 week ago and it takes 3 tries almost every time to start. I picked the boat up after and the starboard engine runs great as always, but the port engine was rough and missing. Also drained vsr line in motor, very little, if any water. occasionally motor will loose rpm and fuel burn will double. if i go through this Jul 21, 2009 · Sep 1, 2003. I have replaced all the filters and fuel lines and have drained the vapor seperator. Jul 15, 2004 · Jul 15, 2004. You may have to register before you can post: click the register link above to proceed. Not really dirty, just the usual carb cleaning job. ). Fuel pressures within specs. I have a 1987 yamaha 90 h. Jun 9, 2003 · #1. #2. 280 hours. Only burned 12 gallons of the 60 gallon [July 2018] 2007 Yamaha 115hp. After bringing the engine back to neutral after normal operation, a rough, pulsing idle starts- not enough to stall but it will go between 600 and 900 and not settle out. 12-23-2020, 12:20 PM. In 2010, boat fired up and ran fine, initially. Sep 6, 2008. if it had a choke plate. 2005 Yamaha F90TLRD EFI motor surges from about 400rpm up to 1500rpm and then will eventually die. 08-23-2011, 11:17 PM. 06-01-2020, 11:52 AM. Aug 15, 2011 · Tweet. An oil related problem can kill the engine. 7 MPH. Most times it's in the 6 MPH zones, low speed and sometimes in neutral. Dec 27, 2009. Commenced end of year maintenance to include: Water pump, lower unit oil, spark plug swap, engine oil, on engine fuel filter as well as fuel/water separator, added stabilizer. If I squeeze the primer bulb, it will usually restart right way and will run until it decides it wants to Sep 2, 2015 · The local yamaha parts dealer recommended ring cleaner and this "shock" treatment was performed running about 20 gallons of fuel. Nov 20, 2006 · Re: Yamaha 30HP 2 Stroke Running Problems. Would be really grateful for any thoughts as to cause or cure. I am thinking it is a voltage problem stemming from a bad stator or Pulsar coil. The motor ran perfect until this year. The motor ran at 850-900 in neutral at first but after running it for awhile it would still miss and die when coming back to idle like coming to the dock. Thanks in advance Tweet. After a few seconds the timing is advanced to 7° ATDC and it struggles to ide and stalls; If I use the, 703 control, neutral throttle lever to increase the idle rpm and keep it running, the ignition is being retarded to between 1° - 4° before TDC. May 31, 2021 · Hi, I'm after some advice as I have been trying to troubleshoot an idle/low rpm issue without success for a while now. It seems to smooth out at higher speeds but still seems not to run as smooth as the port engine. 06-23-2016, 07:42 AM. Sep 4, 2012 · Re: Yamaha 90hp 2 stroke 1997 - misfire/rough idle at low revs and strong exhaust sme Sounds like bad/cracked fuel pump diaphragm causing raw gas to get sucked into motor causing very fuel rich/wet spark plug condition. Aug 2, 2013 · Most motor problems are fuel related, but it is too simple to test and eliminate spark and timing. Any help would be appreciated with the following problem. checked the plugs today and they were white. I did put a timing light on the spark plug wires to check for sparks while idling and all Nov 17, 2011 · Joined. Reason. Has had 100 hr checkup every spring since new at reputable dealer. 01-07-2012, 11:52 PM. Jun 1, 2020 · F150 4 cycle Stumbles/hesitation around 1600 rpm. Boat started and ran fine at all throttle positions except at idle speed. My Yamaha 150 2 stroke at idle every 5 seconds gives a back fire or repeated stutter. I have a 22' Hewescraft Searunner with a 2006 Yamaha F115 outboard at ~1000 hrs. Solution. A thermostat stuck shut will cause overheating. High idles are caused primarily by too much air entering the engine after the intake. We idled for about 45 minutes with Jul 30, 2019 · hpdi 150 stalls at idle and won't run over 3500 rpm. Mar 28, 2006. Jun 24, 2013 · F115 intermittent sputtering, stalling, rough. By Joe McElroy. May 15, 2017 · F350 Camshaft Idle issue. I then put in 15 gallons of new gas in plus a Nov 10, 2023 · That’s how you can comprehend if you deal with higher or lower idle. I have found and read most of the issues on the Idle Speed Con*****er issues. Going on our 7th season with the boat and motor. F150 surging at idle. 05-18-2014, 09:39 PM. After running for about 20 minutes it looses power and it sounds like a plug has broken down. Now the engine runs very rough at idle. Oct 3, 2021 · Boat Update!! Florida Fishing Couple has a boat that won't idle NOW WHAT?HUGE Shout Out to Chris Carson and his son Stan who always help us fix our motor Sep 1, 2019 · Vmax 150 idle. Good spark, Cleaned fuel filter and lines and tank. 04-17-2016, 09:07 PM. You also said the engine dies if you pull the vacuum sensing hose. Occasional misfire at idle. The compression is 90 lbs in both cylinders. 9 - 4 stroke idle problems. Usually I have to do that several times. 14. Tangled Propeller. Hi There Everyone, This'll be my first post on Yamaha Outboard Parts. Apr 21, 2012 · Messages. Hi - I'm new and need help. Unfortunately it hasn't seen much use in the last 4 or so years, only the garage. I had drained the gas out and tank was empty prior to storage. sometimes it would start right back up and idle normally and sometimes the erratic idle would persist. thats why we always like a model number, helps identify what yamaha it is. When I put my pontoon boat away last year. I inherited this engine as part of a 20' pontoon package from my father. The thing looks like new. That is the best way to clean out your engine and help overcome any problems from fuel gum/varnish (which can cause rough idle, loss of top end speed, hard starts, stalls, etc. installed new plugs, and ethenal free high octane gas , also tried fuel injector cleaner . 1L. I've got a Yamaha F115 from the early 2000's. fx fu ce zb eb iz vr rv hk zj