Yamaha 90 2 stroke overheating. The buzzer sounds as soon as I turn the key.

Yamaha 90 2 stroke overheating 00 2. Jul 26, 2020 · Overheating (and subsequent detonation/Piston failure) can occur with stock jetting. When I have the fuel enrichment set to normal the boat runs rough and will over heat after about 5 minutes. Jun 9, 2016 · I recently bought a Bluewave CC 190 classic with a 90TLR yamaha 2-cycle. A few months ago got a old boat. Alarm went off I slowly headed back to "2000 Yamaha 90hp temp alarm g "2000 Yamaha 90hp temp alarm goes off right after running at 4000 rpm. Its 2-stroke design ensures a responsive and powerful acceleration, making it ideal for a wide range of boating applications. Yesterday I dropped it in the water and idled about 20 minutes through the back channel. Could not restart it at the time. Therefore, I want to correct this issue… Additional Troubleshooting: There’s also a small black cylinder shaped capacitor/diode with 2 grey wires (male and female bullet connections - see pics 1 and 2 attached). 00 0 10 20 30 40 F90B Competitor F90A 90 78 65 53 40 BOAT SPEED (MPH) SECONDS Competitor F90B 0–50 ft. it ran crap on 3, or any of the other 2 - not much difference. <br /> good luck and keep posting<br /> ps we dodged charley Brandon tells us what exactly was wrong with Jay Argo's Yamaha zuma prebug and some good reasons why you should purchase from Scooter Swap Shop. Finally got to take it out (my maiden voyage). the EFI 4 stroke 90 will. Nov 9, 2014 · I have a 2006 2-stroke 90 hp. Apr 7, 2019 · Baffled By Overheating Motor Problem (Yamaha 70hp, 2 stroke) Started by AJFishin, April 07, 2019, 06:07:59 PM. I take off and within 4 minutes the alarm goes off and I return to idol for about 20 seconds and it stops. Water peeing good. Now, it’s not starting right up like it used to. A water-cooled 2-stroke cooling system includes the following components: Rad; Rad cap; Hose Having an issue with a 2000 Yamaha 150 2 Stroke Saltwater Series. May 6, 2021 · Have a temp alarm going off on 2007 90tlr 2 stroke. 0 Members and 1 Guest are viewing this topic. When the engine is cold, it appears to need to run under load (low speed) for about ten minutes before it can attain any rpm’s beyond 2K, almost as if it needed to warm up. No one in their right mind would pull the stat and PRV and leave them out. 0 Overheat alarm – yes Click the button below to add the Yamaha 90AETOL | 90hp 2-Stroke Outboard Engine Long May 30, 2023 · Mercury 2-stroke outboard motors are highly regarded in the boating world for their reliability, performance, and efficiency. Read below for the histry of the problem. First changed out water pump impeller,thermostats and poppet valve. Customer: I have a 2018 Yamaha 90 HP. After 2 miles, the motor started running rough and the warning buzzer went off. I start it once a week every week for a 5 minute idle. They are both overheating above 3,800 rpm. So it's running along showing 3500 revs, then drops to zero on the display (while the entine continues along happily at 3500 revs). Water was pumping great and no problems. brought it back to dock I have an older 1988 Yamaha 90 ETLG that starts and runs fine at a low rpm but as I increase throttle it seems to skip a cylinder or two. When the alrm went off the water coming out of the pee stream was pretty warm and the exhaust plate was hot. I see someone said that the alarm in the CDI may be bad. About 7 rides or so ago I was going up a long steep slick switch backed rocky hill and whe Aug 31, 2010 · I have a 200 hp Yamaha 2 stroke 1995 i just brought it and she over heats when you get into it after only about 5-10 min i have removed the leg and there are no blockages in the pick up so far i have replaced head gaskets (no blokages in heads or bores) water pump impeller (no excessive wear on plates oring sealing) Nov 20, 2015 · the 90 two stroke will never sound a buzzer with the kill lanyard disconnected. May 26, 2012 · I have a 90 HP Yamaha two stroke. It always had an issue that when in gear at low rpm, like idle or under 1000 RPM, it will overheat. Now the symptoms are intermittent and has only happened 3 times but two of them was this last weekend. Jun 30, 2016 · Hi, I have a small planing catamaran with 2 x 90 Yamaha outboards of 2006 vintage. Around 5800 rpms. Shut the motor off for about 20 minutes before restarting. Jul 24, 2011 · yamaha overheating I had the same problem last year with yamaha 150 trp. I’ve literally tried everything and reluctant to pull the head as Feb 8, 2013 · Same year 90 and same problem. Removed taddle-tale hose from cast-nipple on block-cover Rodbolt speaks of and inserted a small drill bit into block. Sep 24, 2022 · 4 Common Reasons Why Your Yamaha Outboard is Overheating (305) 251-4067 Map & Hours Contact Us Toggle navigation. Jul 5, 2011 · It has a 2002 90 hp Yamaha two stroke and it's mounted on a 2002 172 Scout Sportfish. Aug 18, 2022 · Anyway in detail then - when it is in dog mode I was convinced for a while it was running on 2 I first pulled off the plug caps one by one to try and see which cylinder made no difference - this test was inconclusive. I have put the motor down in a trash can full of water with May 4, 2016 · The corrosion will insulate the overheat sensor from the water and won't allow the cooling water to get to it thus making the alarm sound. Still sending an overheat alarm after being opened up fully after about 5 minutes. 00 3. 129th Street Apr 27, 2022 · 2006 90 horse 2 stroke 900 hours. It began overheating earlier this year. As with any engine that is not cooling properly step 1 is to replace the impeller and/or complete water pump assembly, thermostats, and service the water pressure control valve , and retest. have swapped coils on #3 cylinder problem remains on #2. It is overheating. I can put my hand on motor over thermostat and it does not feel hot. Motor is peeing the whole time. Mechanic used infared thermometer and it was not overhot. Motor is a 03 model. so its easier to state just fact. I have replaced the internal components of the water pump. Is this an improved design? This finally fixed the problem that stumped the Customer: I've got a 90 hp yamaha 2 stroke that i mix oil in the tank. I noticed that by putting the key in the on (not start) position the overheat indicator was blinking the bottom right corner. Here is what happens: The motor starts off peeing good when started but gradually loses pressure and within 15 seconds has lost about 50% of the original pressure. The oil is full and it is not over heating. It stopped pumping water out the 'pee hole' and steam came out instead. Jun 15, 2018 · 2002 Yamaha 90 TLRA While I've had the boat about a year, I've been refreshing the internals. I am guessing I need to pull the head and water jacket and clean out and flush water passages. I can't find the pressure in my manual, but 3 or 4 lbs. I have a 2004 90 that I have idled for 2-3 hours at a time graphing and never overheated. Sep 8, 2024 · (without overheating engine!) In case it's relevant, the last few times I've taken the boat out, I noticed the revs/tacho display on dash has lost the revs. Just about everything I could think of. The overheat sensor and cover are easy to get to and clean on the 150 4 stroke. Aug 9, 2015 · Aside from the noted causes and effects I'll add that my 1985 Yamaha 90 had the same symptoms once, which were caused by a thermal sensor in the head that limited operation to 2000 rpm. May 27, 2003 · One "Yamaha" authorized dealer put in a non-Yamaha impeller. As soon as I turn it off, the remaining water comes out very hot. Jul 25, 2020 · My son has a 2019 yz 250 about 80hrs on it, piston had 50hrs on when we went to GNCC high voltage, Very hot dusty day. (Over temp alarm flashing on display goes into safe mode) It will run 4100 rpm's all day long. We run Motul 800 at 40:1 and 750ml of Maxima MTL 80. It appears to be the port head that is overheating since it is the port heat sensor which is closing. now would be a great time to change the t-stats as well. Tuning tips,. have also run "salt away" through the motor Feb 11, 2007 · Yamaha 90 2 stroke overheat at idle 02-11-2007, 01:17 AM. I let it cool down, then ran it about 4000RPMs, trimmed in a bit more for comfortable planing attitude and no more overheating. Many times when just idling under 1000 RPM it will overheat. It didn't fix it. Mar 6, 2013 · But I am concerned that if my engine ever does start to overheat or the oil reservoir gets too low, I won’t receive a warning. Oct 5, 2015 · My 90 Hp had an "overheat" alarm which would then slow engine to maximum of 1600 RPM. What is the CDI? Aug 15, 2005 · Re: YAMAHA 150 2 STROKE OVERHEATING I take it thats a negatory on the pressure control valve and grommet service?<br /> dont make us dance. I ride lots of hard, tight and rocky single and 2 track. My local dealer reckons it is the thermostat sticking. He made it about 7 miles and bike locked up, found to have broken piston on skirt, took bike apart, split case cleaned it out, crank look good, bearings all look good, cylinder h Nov 8, 2020 · So just bought an early 90's 90hp 2-stroke. The spec is 0. Then after that please read the new info. I have changed the impellers and thermostats, checked the alarm sensors and they close at the right temp. I emptied the oil and pulled the oil float switch. The diaphragm in the pump may be bad. MY OVERHEATING ALARM RANDOMLY GOES OFF and appears not to be overheating. Jun 28, 2015 · My S150TXRV 97 Yamaha 150 2 stroke has been overheating at high RPMs. Aug 14, 2018 · In this video I documented the steps I took to fix an overheating issue which included an attempt at flushing it with Rydlyme and then the work necessary to Yamaha Enduro 2 Stroke 15HP Service Manual: UFO: Engines and Propulsion Systems: 6: 06-08-2023 06:13: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke: UFO: Engines and Propulsion Systems: 31: 22-05-2020 08:24: Yamaha 15hp 2-stroke: Enduro or Leisure: nhschneider: Auxiliary Equipment & Dinghy: 21: 06-09-2014 08:44: 15hp Yamaha Aug 31, 2010 · I have a 200 hp Yamaha 2 stroke 1995 i just brought it and she over heats when you get into it after only about 5-10 min i have removed the leg and there are no blockages in the pick up so far i have replaced head gaskets (no blokages in heads or bores) water pump impeller (no excessive wear on plates oring sealing) The Real Housewives of Atlanta The Bachelor Sister Wives 90 Day Fiance Wife Swap The Amazing Race Australia Married at First Sight The Real Housewives of Dallas My 600-lb Life Last Week Tonight with John Oliver 3 F 90/F75 YAMAHA MARINE GROUP HOT SHEET 0. Mar 2, 2015 · A few weeks ago I took my 1990s 25 hp 2 stroke to a boat repair mechanic after the engine was overheating. 00 4. Idled around fishing for about 2 hours with no more issues. Jan 18, 2009 · Hi, I have a 90 Yamaha Outboard two-stroke and it is not peeing out the back? It is a 2004 model with not many hours, runs perfect, just not peeing-spitting water out the back. Mostly no wake zone and a short faster run. The impellor was new 6 months ago and upon checking looks good, also the water pump assembly in general looks ok. 500 outboards boug Jul 7, 2021 · You can check fuel pressure if you have a fuel pressure gauge also to rule out the fuel pump with it running on the muffs. I have a 1991 TLRP-90 and the Cylinder Head has two chambers, there was a pinhole leak (corrosion) from combustion chamber into the inner cooling chamber and after running for a Jan 20, 2018 · I have a 2002 90 HP 2 stroke and owned it since 2002. Aug 19, 2003 · Re: overheating 115 yamaha 2 stroke In addition to overheating, not having any oil in your tank could also cause the problem. Today, on the last day I could put the boat on the water, before I have to leave for the summer, I got a problem. Mar 4, 2025 · Joined: Thu Dec 05, 2013 4:38 pm Posts: 80 Location: Philadelphia/South Jersey Year: 2012 Make: Yamaha Model: SX190 May 17, 2015 · Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. It has a new water pump and thermostat and the problem still exists. Same attempts to restore pee; water pump; pee hose cleared, etc. Motor will do great starting, idling, and running until pushed towards WOT then will drop RPMs over time Customer: Yamaha 1998 2 stroke 90 no spark #2 cylinder. I cannot get it to pump water through the engine. some of this dance everyday trying to get the whole story. The buzzer sounds as soon as I turn the key. New fuel lines, pump, filters etc. Dec 14, 2013 · I have a 90hp 2 stroke oil injected motor details( Yamaha 90AETO 6H1 L 1009809 P )think it may be a 1991? the alarm sounds when at idle after a minute or so, pumps plenty of water and will never happen if driving or sitting with revs up, I have had the impeller , thermostat & heat sensor replaced. Problem continued. Jul 22, 2023 · I have a 2005 Yamaha 90 2 stroke that overheats after 4300 rpm's. The motor fires up just fine. Jun 10, 2021 · 4 COMMON REASONS WHY YOUR YAMAHA OUTBOARD IS OVERHEATINGhttps://www. 2004 yamaha 150 2-stroke? Answer - I would be happy to help you with that. Old Info: I have a 2006 YZ250 that I got in 07. If not warmed up, it just bogs at anything over 1. Water passages not shown before, once I got it all together this motor is running super cool! 1. It was still spitting strong. Bike is a 2016 YZ250 X, that my son uses for racing cross country. Jun 12, 2008 · Hi Guys, I have a 1997 Yamaha 115 Saltwater Series Oil Injected 2-Stroke. 24 ohms on the Aug 15, 2004 · Re: 1994 -225 2 stroke yamaha overheating your water pump is way overdue mon. So I changed both thermostats but now motor overheat alarms are going off but after 30 minutes of running at 2800 rpm. A quick run to just get wet. Overheat alarm going off after about a minute at high throttle. Aug 14, 2018 · In this video I documented the steps I took to fix an overheating issue which included an attempt at flushing it with Rydlyme and then the work necessary to Yamaha Enduro 2 Stroke 15HP Service Manual: UFO: Engines and Propulsion Systems: 6: 06-08-2023 06:13: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke: UFO: Engines and Propulsion Systems: 31: 22-05-2020 08:24: Yamaha 15hp 2-stroke: Enduro or Leisure: nhschneider: Auxiliary Equipment & Dinghy: 21: 06-09-2014 08:44: 15hp Yamaha Apr 18, 2013 · I have a 2006 YZ250 that I got in 07. Customer: 98 75 hp yamaha 2 stroke. Let’s dive in! Causes of Yamaha Outboard Engine Overheating Oct 8, 2024 · I have a Yamaha 25 4 stroke that ingests a lot of sand. I just bought a "rebuilt" Yamaha 70hp 2-stroke. 00 1. Changed thermostat, and water pump kit Dec 24, 2017 · I have the same problem with my 1988 Yamaha 90 2 stroke when the key is turned on. The motor will run great all day long under 2600rpm, but once I try to run it at a normal speed higher than 2600 it's not long (about 2 minutes) that the tempature alarm goes off & I have to shut it down to cool. Mar 23, 2015 · Need some help trouble shooting a over heat on a 2005 yamaha 90hp 2 stroke. replace them both. Customer: I have a 2001 yamaha 90 horsepower 2 stroke. Power and Efficiency: The Yamaha 90HP 2-Stroke engine is a dynamic force on the water, delivering 90 horsepower of pure, efficient performance. Aug 9, 2009 · hey guys, I have been looking on my 2004 Yamaha 90 2 stroke for the pressure relief valve "poppit valve" and I can't seem to find. A couple weeks ago as soon as I turned the key the alarm would sound - motor was cold so it wasn't from overheating. My bike has never overheated or boiled over before Aug 7, 2006 · y yamaha 90hp 1998. The temp alarm went off, I put it in neutral for a few minutes. Apr 28, 2013 · Yamaha 90 two stroke overheat? Jump to Latest 1K views 7 replies 6 participants last post by I've got a 2002 90 Yamaha LTRA 2 Stroke and started overheating while flushing the motor on the headphones the other day. Oct 23, 2005 · Over heating alarm 90hp 2 Stroke Yamaha 10-23-2005, 03:14 AM I have just replaced the impeller and themostat on my engine it ran well for an hour or so then the alarm went off and the engine lost revsI went back to neutral and shut engine down, it ran well for a time then the same thing happened again. I changed the thermostat, and am still having the same problem. I only ride it after maintenance on it around the yard. The 70 may have this same sensor and so could be a third potential cause though obviously not in this case. I can only flush using a two-sided muff because a one-sided muff results in overheating after 3 minutes. On my most-recent trip with it, it was running fine but on the way home I went full-throttle and the overheat alarm came on. I do not see a pink wire on the oil injector. There is a green and a green with pink Strip. I took off all the coils. 0 x 72. For sure try replacing impellor and thermostat first. Is this a faulty thermo switch as the engine isn't overheating and there is plenty of oil in it? Mar 4, 2013 · That 90 yammy shouldn't overheat idling unless something is wrong with the cooling system. Ended up having to have head milled and replacing head gasket. Its a bit of a lengthy description but this is what I've got. My model has the oil tank mounted on the block. Apr 30, 2012 · the boat is a 1860 g3 with a 2 stroke 90 hp tlrc yamaha. I have had trouble with motor overheating at idle or under 1000 rpms. May 27, 2020 · Water-cooled 2-stroke Cooling System. Didn't seem or feel hot at all, but turned out that it actually was overheating. I would change impeller and try again. I have had the engine for two years. went fishing and same problem anything over 3200 rpms and 1/4 mile later alarm would go off so back to square one bought marine flush mild acid from hammerhead marine hooked up pump and circulated for 1 hr Feb 5, 2021 · Yamaha Enduro 2 Stroke 15HP Service Manual: UFO: Engines and Propulsion Systems: 6: 06-08-2023 06:13: Problem with Removal of Lower Unit - 15HP Yamaha Enduro 2 Stroke: UFO: Engines and Propulsion Systems: 31: 22-05-2020 08:24: Yamaha 15hp 2-stroke: Enduro or Leisure: nhschneider: Auxiliary Equipment & Dinghy: 21: 06-09-2014 08:44: 15hp Yamaha Aug 12, 2014 · I have a 1996 90 HP Yamaha 2 stroke. However, like any mechanical device, they can occasionally encounter issues and require troubleshooting. ONCE - while I was running WOT, engine trimmed out, just trying to see how fast I could go, my engine overheated. There is a sending unit in the oil supply tank that could cause the same alarm to trigger. Their water-cooled cousins are a ton more sophisticated, but not complicated. I installed a Rekluse EXP 2. 0 about 7 months ago. the pressure valve is under the 2 bolt cover at the lower stbd side of the exhaust cover with the large hose on it. 18 to 0. My guy cleaned it all out and was going to patch some of the pitting and roll with it but it ended up being too bad to repair. Home Engines Engines Repower Yamaha Outboards Mar 11, 2011 · Re: Heat Sensor for a yamaha 90 two stroke outboard OK I think that the part in the pic is the temp sensor. 2004 115 2 stroke Nov 27, 2017 · Hey guys, I am new to this group so any input is greatly appreciated. I didn't need the housing, my motor is nearly corrosion free after 17 years. He also told me the bolts that I need to remove to get to the thermostat can prove difficult to remove. I have check to see if the out hose is block and it is not. usually happens below 1000 RPM. . I blew compressed air, used weedeater string to chase out all passages. to test the 90 two stroke simply disconnect the pink temp switch lead,ground it,turn the key on. Bike has 130hrs and a fresh OEM top end installed around 100hrs and everything a Apr 16, 2023 · Hi All, Longtime lurker seeking help! I have a 2002 TLRA 60 HP with very low hours (70) that gets the over heat alarm at low RPM’s after 7-8 minutes regardless of it’s on muffs or in the water. My overheat alarm has only went off twice. . no single engine Yamaha does a self test, at least not for the US market. 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 Chasing my tail on an overheating issue. The water Sep 23, 2021 · Hi, I'm experiencing an overheating problem with my Yamaha 60 2 stroke outboard. The water pump seems to be working fine a steady stream out of pee hole. 5 minutes after putting in water the overheat alarm sounded. I love everything about the boat and set up. Yamaha 90hp 4 stroke water flow problem and overheat 2011 F90 TLR 06-28-2015, 01:01 PM Got this boat on Friday. Only over heats at wide open throttle. 00 6. com/blog/yamaha_outboard_overheatingWHERE TO FIND US8755 S. Dec 4, 2017 · Comp was 110 106 108 after running briefly. Not all two strokes are air-cooled. Jun 24, 2012 · I have a 1999 90hp two stroke that the over heat alarm started going off so I had the water pump changed. I let it sit just for a few seconds and the alarm goes off and power returns. May 22, 2011 · When I dropped it in the water again, I ran it at "no wake" speed for about 30 minutes and it spit strong, no clogs, no fuss, no muss. Your question was - overheating at low/idle rpms. The engine ran ok at idle but when opening the throttle to full, it was not getting all the power and eventually overheated, steam, hot smelling. It runs for about ten minutes then the rev limiter comes in and it has the power loss. Boating Forum 3 F 90/F75 YAMAHA MARINE GROUP HOT SHEET 0. I shut it down and took it straight to the dealer and they changed the water pump. I believe it's a 2001 model. I've tried pretty much everything from the list of basics but cant find the problem. loosen the two side cowls or just remove them and the remove the two fasteners holding the panel. I can run it no problem under 4200 RPM but as soon as I go higher it begins to overheat (the alarm comes on and power is cut until it cools off). I've had to remove the intake screens, remove thermostat, remove any brass hose fittings and coolant hoses. The fuel pump works off of crankcase pressure pulses on a 2 stroke. W. It has the yamaha digital multi function tach. Just a bit slower and Sep 3, 2024 · Got the overheat alarm on a 2005 90 Yamaha 2 stroke, took off the water jacket for a corrosion cleaning of the water passages and of course managed to break Aug 9, 2013 · I just went through an overheating episode on my 60hp 2-stroke. New wiring from scratch. Jun 26, 2013 · I have ran into this issue where my 2002 yamaha 90 2 stroke will cut me down to 2000 rpms for no apparent reason. I've cleaned dozens of water jackets/heads on 2 stoke Yamaha's for this reason. Here is the problem. After about 20 minutes I can restart without alarm idle back to dock. As EGT's gets to 1300F (molten aluminum) all hell breaks loose on pistons good and bad. Put boat in gear and after few minutes the alarm goes off, back to neutral and then back in gear and the motor runs fine, alarm will not come back on unless motor is shut off and Late 90's 90 2 stroke, Idle's fine, pee's good, throws overheat alarm when I run 3800 rpm for 10 min, Put new Impeller kit Thermostat Temp sending sensor/switch Mar 21, 2012 · Re: Running hot at Idle & Low Speeds - 90hp 2 stroke Yamaha You need to find a real mechanic. I ship country wide. 00 7. could it be behind Jul 7, 2013 · I have a 2000 2 stroke 150 that keeps overheating. side mount 703 remote control box. My bike has never overheated or boiled over before until now. 2. Previous topic - Next topic. when i unplugged this part from the motor though the alarm did not stop, however it did stop when i unplugged a wire leading to this part. 1. <br /> the valve looks like a small t-stat Oct 10, 2024 · I have a 90 Yamaha that kept overheating too and we changed all the normal parts out and it still did it. The system contains a lot more components, and therefore the maintenance checklist is longer too. Crank boat in water and within 3-5 mins the temp alarm goes off. I did a search on here first and found a pic from a 150 but I don't see anything close to it. I have a 2003 90 two stroke that overheats on plane. New water pump was installed and has a very strong pee stream. I shut motor off, restart, and temp alarm still on. 5K to 2K rpms. Marine wholesale salvage everything sold as is described 100% accurately. 00 8. When I took it up to running speed, though, the alarm kicked on after about 30 seconds of 4000 (or so) rpm. sitting on a shelf looking part there is a 10mm hex holding a locking device on about a 1 7/16ths hex. Just replaced impeller, thermostat, prv, and thermo switch and still the alarm, I can run the motor at low rpms with no problems for hours Engine: 1994 Yamaha 90 2-stroke Repair difficulty: Easy Repair time: 1 to 2 hours Repair symptoms: Low volume water pump output Repair story: Ordered the water pump repair kit, factory Yamaha parts, impeller, housing insert and all gaskets. <br /><br />I was having a simular problem and all it ended up being is that the battery connection was lose and the sending unit wasn't receiving the proper voltage to register Hello. They are in the motor to make sure water flows to all parts of the motor properly at all RPM, without them in place you will have hot spots and cold spots. My Yamaha 90 2 Stroke (C90) is mounted at the third hole down. From understanding Yamaha water pump failure symptoms to knowing when to replace a thermostat, this guide covers essential steps for troubleshooting and preventing an overheating Yamaha engine. After 2 trips to 2 different "Yamaha" repair shops an old guy in Arkansas put in a Yamaha impeller and cleaned out the tubes, water jackets, where ever the water flows around the heads through (I,m obviously not a boat mechanic) and the problem stoped. The motor is peeing cold, but the stream is strong. 00 5. I disconnected the oil sensor and the buzzer went off. first trip out with it, overheats almost instatly when I brought it up to speed. I do not get an alarm sound from the engine for overheating and it acts normally while under 2k. Apr 17, 2005 · Re: Yamaha 4-stroke 225 overheating looking at the aft of the engine just below the cowl you will see a panel about 9 inches by 4 inches. I am assuming it something to to with the oil. very basic set up, no instrument panel . Recently, when in idle or less than 10,000 rpms for longer than a few moments, the overheating alarm is going off. I noticed that the Pressure Control Valve that I took off looks different from the new replacement . Also the water is starting to get super hot. ericsoutboard. Have not checked peak output on anything (lacking the tool). I don't really have any thing else for you though. clean the valve pocket and replace the grommet and do the pumpo. Good water stream out the motor. Jun 21, 2013 · I posted this a couple months ago and it happened again. Jetting is just one variable -among many- that have to be evaluated and rectified if necessary. I've already removed the Cylinder head cover and cleaned all deposits Apr 3, 2019 · After 15 minutes or so, I increased the speed to approximately 3/4 throttle and the boat ran good for about 2 miles. Last week the overheating alarm went off soon after launching the boat. Jan 27, 2009 · I had problem with 2000 - 90 yamaha 2stroke overheating as soon as I ran it up to 4000 rpm. Also in neutral it revs fine. Feb 12, 2014 · General Interest Forums. I have been having this issue for about 2 years now. Pulled the ignition switch out and check all the connections to make sure nothing broke loose or pulled apart, and then put a 12 volt light tester on it to check for power. If I switch it to open it will run without overheating but it doesn't perform as well as I expected it to. What I was getting is a continous alarm when i turn the ignition key to crank or even when i just turn the ignition key to ac. remove the 10mm hex headed bolt, taking Power (hp): 90 Bore x Stroke (mm): 82. if the valve leaks at low speeds it causes a low water condition at the top of the block. remove the panel. If I unplug the thermo switch the alarm quits. Ended up being the water jacket almost totally clogged with buildup. finally ended up replacing the thermostat and pressure control valve. High rpm’s are not an issue and runs well. Apr 12, 2011 · My 1980 Yamaha 4hp 2 stroke overheated last time out. Impeller replaced and everything has been cleaned. When I reconnected the sensor it stayed off. The gauges are working correctly steam is coming out of the exhaust just before I shut down the motor. Re: Yamaha 90 2 stroke overheat? You need to understand how your cooling system works, firstly the water out the tell tail can be cool and the motor overheat, the tell tail indicates that water is pumping, however if the thermostat and or thermostat bypass valve doesnt open the water will not circulate through the power head and it will over heat despite water flow out of the tale tail. C75tlrw. should be plenty. lpcf wpof qjpmh zgjbbix dypdgl kexhkz lwxgqmt quwaju tlvwli ddmt unewnhn huzp fqzm viea ymu