Running Outboard Without Thermostat

Designed to deliver unsurpassed power and performance in an efficient, reliable package that's built to please, the new FourStroke V8 and V6 outboards are the smallest and lightest in their class. I have an overheating problem with my 175 hp Mercury outboard motor and don't know how to troubleshoot it. Should i be worried? Any ideas short of changing the impellor? Mike. 9 that the previous owner had removed the thermostat. Additionally, an outboard engine affects both safety and performance. Buy Evinrude Johnson Thermostat Assembly 0434137: Body & Frame Parts - Amazon. 2005 Mercury Verado 275hp Outboard Engine Motor 25 Used. I've been told that no one replaces thermostats in two strokes but it came with one and I would like it to run right. Running the outboard in the cold no need to start your engine to spit water out whether or not your thermostat is open or closed, gravity will drain the water out. It's a simple matter of removing the cylinder head cover. Serving Delaware, Maryland, New Jersey and Pennsylvania Rudy Marine is one of the areas largest Yamaha Outboard dealers. The thermostat is no good and stuck open the 3mm that it should be at when running hot. The thermst. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. Turn on the freshwater supply to the flush kit coupler. I think the Mercury outboard has a poppet valve that bypasses the thermostat when it fails anyway. test ran it a couple of times at 5500 rpm for 45 minutes and no problem. I just reread your post, I guess if that's 20 years old it's not that bad. Once removed, push and twist the thermostat and it all comes apart (easy refit). 8 hp 4-stroke has set the standard in portable outboard power! This lightweight motor weighs in at barely over the 80 lb mark and has undeniable characteristics of a true marine champion. I think it works too. More specifically I have a 135hp V6 Mercury Blackmax outboard from approx 1985. I have a 50 hp yamaha outboard that pushes a thundercat along. Smaller and midsize four-stroke outboards use the flush port at the rear of the engine. Our Yamaha 15F portable outboard motor was reasonably cheap to operate and service yet had the grunt to get us quickly back to our boatshed when the lake turned nasty, even though sometimes we ended up looking like drowned rats by the time we got ashore. The quick flush is great if you are renting a house on the water without a lift for a week or so. 2007 - EVINRUDE E-Tec 115 - 200hp Operator Guide - 215770E 115-200 HORSEPOWER PL, PX, SL, HL, CX Durable and Reliable •Full Corrosion Protection •Evinrude E-TEC Lubrication System •Auto-Calib. Yamaha's F250 outboard continues to evolve with a retro variation that foregoes drive by wire for a mechanical control box and is intended for re-powering. You add a new dump line (5/8"ID) hose and put it on the fitting on the thermostat housing that fed the headers. Only for use when engine is not running. Doesn't sound like a thermostat to me Any help would be greatly appreciated!!. Let me know what you find, I'll keep digging as well. There’s not much you can do if your engine has bad compression. Running your outboard without an adequate source of cooling water will result in severe damage to the motor. Damage caused by running the outboard motor without sufficient cooling water is not covered by the Distributor's Limited. Ok, so I poked around looking for the answer as to whether or not one could start the engine out of the water by JUST connecting a hose with running water to the flushing adaptor, without muffs. My 40 hp honda outboard isn't putting out any water from the teltale. Running the engine without a water source for any length of time will cause damage, so you'll need to attach a hose to. Find the Thermostat-435597 at the Evinrude online store. This will help eliminate problems before they occur. Tuned for max acceleration and throttle response. Evinrude/Johnson outboard lower units. Another recommended procedure to thwart the wrath of ethanol-laced fuel is to regularly use a commercial fuel additive designed specifically for ethanol. Once removed, push and twist the thermostat and it all comes apart (easy refit). One thing commonly known to most boaters, but not all newbies is that most outboard motors are water cooled (either artificially, or on a boat in a lake) and the water is pumped up into the powerhead to cool it. I have a 90 hp outboard which is over heating in 5 mins when over half throttle. Efi Racing Engine Only. Its quiet operation is surely a treat. If stuck in an open position it will cause overcooling and if stuck closed, overheating. I have read my owners manual and many of the posts on how to use the flushing port, but I am still confused on use of the flushing port for running the outboard on the trailer. Keep outboard well serviced Allow 10 minutes on the ear muffs so that the engine gets hot enough to open up the thermostat and flush the full system. Just got my new motor last week and mechanic said to run it with earmuffs until warm in order for the thermostat to open. I figure the folks at OMC pretty much knew what their outboards needed, so if there's supposed to be a thermostat in one, it's probably because they designed the engine to run best with one in place. Installed new thermostat. Honda engines are developed, tested, and certified with petroleum based motor oils as a lubricant. I wanted to inspect the cylinder bore and pistons. Said the hose attachment is used when you are remote without ability to run off the earmuffs (like when the boat is sitting overnight in salt water but you have fresh water in a dock hose). Motor runs fine and no overheat light. loop-charged models-it's easy to see why an OceanPro is the only outboard to run in saltwater. Running the cylinder head at a cooler temperature than the block allowed Honda engineers to dial in maximum horsepower without chancing catastrophic engine failure. If the thermostat become inoperative and stuck in the "cold" mode, it can cause overheating in the outboard motor. Johnson Outboard Parts Forum; If this is your first visit, be sure to check out the FAQ by clicking the link above. Doesn't sound like a thermostat to me Any help would be greatly appreciated!!. we have cleaned the water jackets and installed a new impella. Flushing a boat motor by running it out of water is a routine maintenance task. The salt water models differ only in cylinder porting starting at 225 HP. I replaced my thermostat last weekend and it seems now that the impeller (new one month ago) is not pushing as much water through. Run some Sea-Foam in the tank. Check the yellow/red wire for 12 volts while the engine is running. The thermostat is housed inbetween exhaust covers. What does the "outboard" in outboard motor mean?. A little TLC and preventive boat motor maintenance will help with safe boating and keep your motor running well for years to come. could find the actual hyperlink to attach to the choices plus publishing company of 1989 audi 100 thermostat manua PDF Full Ebook. Unmatched in its class, the Tohatsu 9. left assembly or on the upper part of the bracket swivel. The installation was quite straight forward, only minor adjustments. There are plenty of outboard re-powers and other applications where drive-by-wire technology is not appropriate. Its reliability is almost unmatched and you sure to have a great time with it. The current-carrying cable should consist of a braided 2. The Honda outboard we tested gave us no problems on or off the water. The engine must be warmed up to open the thermostat and circulate water throughout the engine's cooling passages completely. how hot should the water discharged from a suzuki 140 ho outboard get, how warm is the water supposed to be pumping out of a outboard, merc 115 how much water should spray from pee hole, outboard pee hole tube, peehole water cool on motor, water coming out by water tube 25 merc, water temperature for 225 horsepower suzuki, what temperature. It might be stuck closed. It arrived empty as this was removed after the initial PDI (Pre Delivery Inspection) by the supplier. If you run without a thermostat, the engine will not have even heat. NOTICE Running the engine without good water circulation can cause overheating and water pump damage. How this vital engine component works to protect your boat. If your outboard alarm system works, you should get a "fuel restriction" warning. To start viewing messages, select the forum that you want to visit from the selection below. Failure of the Water PumpOne of the most common reasons behind overheating in outboard motors isfailure of the water pumps. How to Maintain an Outboard Motor. If it is too large it will be heavy and will consume more fuel and one too small will be unable to power the tender at a reasonable speed. How much does it cost cost to install a thermostat? In an era with lots of technical advancements, many people are choosing to upgrade their thermostats to newer models. ” “The thermostat allows the engine block to heat up and expand. See the chart below to match the Sierra kit to the corresponding Yamaha part number and outboard engine application. 4) Check the Thermostat Although it is rare for the thermostat on an outboard motor to fail, it does occasionally happen. I have read my owners manual and many of the posts on how to use the flushing port, but I am still confused on use of the flushing port for running the outboard on the trailer. Running your outboard without an adequate source of cooling water will result in severe damage to the motor. On these pages you will find some of the more common replacement parts, organized by engine manufacturer. Damage caused by running the outboard motor without sufficient cooling water is not covered by the Distributor's Limited. Buy Evinrude Johnson Outboard Thermostat Housing Cover P# 306172 motorcycle in Tacoma, Washington, United States, for US $7. Large Capacity 19A Alternator The DF40A / 50A / 60A are equipped. One of the difficulties facing the marine cooling system, or any cooling system for that matter is in separating the air from the coolant. If you can duplicate the concern, then you can diagnose the concern. This position mixes Salt-Away and water to the correct ratio of Salt-Away to water for easily removing salt. The current-carrying cable should consist of a braided 2. FourStroke - Excellence without compromise Elevate your experience on the water with Mercury FourStroke outboards. Running your outboard without an adequate source of cooling water will result in severe damage to the motor. I have an overheating problem with my 175 hp Mercury outboard motor and don't know how to troubleshoot it. the fuel bulb. If your boat is running a little slower than normal or worse yet, you can't even get that outboard to sputter to life anymore, you can get all the replacement parts and maintenance items you require at a fraction of retail pricing. 0 without the jiggle valve so people comparing the superstat to the base thermostat wont ask questions. Begin by connecting your garden hose to a faucet, hooking it to a motor flusher, placing this over the raw water intake, turning on the freshwater and starting your boat's engine. Hi Guys, running an outboard with operating thermostats more than 5 minutes on a flusher is a waste of water. the carbs and physically clean them. Hold the new thermostat's mounting plate up to the wall to check whether you need to drill new holes for the mounting. encountered a similar experience with their own boats they suggested looking at the thermostat to the motor. As it runs at idle speed, the priming bulb goes soft as well, but I'm not sure wheteher that is actually normal or not. It's a 98 model. 45hp mariner 2 stroke. quite a few(me incuded) of us out here run our caburated 2 stroke outboards without thermostats and that got me wondering if it would do any harm to the general running of my 200tdi?? i think it doesnt matter on the two strokes because of the way they are lubricated but i have a suspicion that th. Get YouTube without the ads. Some merchandise may be limited in supply or available only by special order. From searching it seems like the thermostat might be broken but I don't understand why sometimes it goes above cold. The water comes into the outboard's engine through the lower unit, which is below water level as the boat is moving. E-tec 75 HP Outboard Motor pdf manual download. Idea's??? I don't have a temp guage or a pressure guage. One of the difficulties facing the marine cooling system, or any cooling system for that matter is in separating the air from the coolant. I have been having trouble keeping it running at idle. 4) Check the Thermostat Although it is rare for the thermostat on an outboard motor to fail, it does occasionally happen. It arrived empty as this was removed after the initial PDI (Pre Delivery Inspection) by the supplier. the problem is that between 3/4 throttle and full throttle we seem 2 lose power and a rattling noise is created. We help you save hundreds and sometimes thousands of dollars on outboard motors, powerheads, lower units, outdrives, gear cases and more! Warranties available!. The overheat sensor called a "sender" in the parts list is part no 97465. the thermostats and or thermostat seats when used in salt water. Most outboard maintenance schedules call for inspection of the impeller every 100 hours, or once a year. All of these components put together is what makes up the engine. We ordered the Suzuki 17670-93962 listed in the parts manual and have a question as to how it is installed. Typically a thermostat is closed at lower temperatures, then when the water rises in temperature the thermostat opens. If the coldest setting on your kegerator gets to say 38, and you set your external thermostat to say 34, the inside thermostat is going to shut down the compressor at 38. No, you can not remove the thermostat and continue running the engine for long periods of time without causing harm to the engine. Will an Outboard Run With Bad Compression. Suzuki 50 HP outboard motor keep overheating. Running the outboard with little or no cooling water will cause expensive overheating damage in a very short time. Did you cool down all the way? Didnt think so. Find outboard engine specs, special financing, accessories, and Honda Outboard Motor dealers near you. NOTE - Parsun outboards are water cooled. YAMAHA’S 4-STROKE 9. we encounter our outboards not running properly. Typically a car can't heat up enough and will run rich/open loop and never make it to operating temperature/closed loop. Find a yamaha outboards on Gumtree , It has had new oils,impeller,thermostat,plugs etc and used on a 1 hour outing and started now in good running order. Damage caused by running the outboard motor without sufficient cooling water is not covered by the Distributor's Limited. I would put the correct thermostat in it and see if you can make it over heat. Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. I checked the water pump impeller and it is fine. Honda Outboard Parts Forum; If this is your first visit, be sure to check out the FAQ by clicking the link above. Still, to avoid problems it is best to service the engine according to the owner's manual. Thermostat is fine since it pees strong most of the time and doesn't overheat most of the time. If we were going to buy a new one, I found the original Yamaha parts available at www. Currently running on a YAMAHA 115 4 STROKE 2002 outboard motor (149 hours of use, fuel injection). Its larger torpedo, combined with a bigger-diameter prop, can lift a heavy boat onto plane more easily and hold it there at lower speeds without impacting top speed. Only been taken out about 10 times. The proper way to check a thermostat is in what is basically a slow cooker than can be set for a specific temperature to see if the mechanism opens at the right temperature. Flushing a boat motor by running it out of water is a routine maintenance task. Follow the tell-tale hose up to near the top of the block - the thermostat should be located under a cover the hose attaches to. Even a few seconds operation without water can destroy the water pump impeller. The overheat sensor called a "sender" in the parts list is part no 97465. This being the case, NEVER run the motor without it being supplied sufficient water in one manner or another. This will help eliminate problems before they occur. Every time boat is put away, engine is flushed thoroughly. Contact a Honda Marine dealer for information on how to determine the model year of Honda outboard motors after the 2006 model year, because Honda stopped using model year designators in the serial number beginning with the 2007 model year. I now run gumout all the time in my fuel. I don't remove thermostats because I've learned, the way you and the veteran techs did 30 years ago, running a motor without a thermostat is simply a band-aid for a weak impeller or faulty cooling system. One of the difficulties facing the marine cooling system, or any cooling system for that matter is in separating the air from the coolant. I PUT NEW THERMOSTATS IN MINE AND WAITING TO TAKE IT TO THE LAKE. thermostat for greater reliability. Re: Can Outboard run without Thermostat? I don't run with a thermostat at all, and i live in maine, but i only have a little 18 horse. I think the Mercury outboard has a poppet valve that bypasses the thermostat when it fails anyway. With the thermostat removed, the difference in temperature between the inside the cylinder and the water jacket quickly reaches a point whereas (in effect) you have a oblong piston running up and down a round cylinder, or vice versa. Priced individually, sold @ multiples of 2 Quicksilver Branded, Clamshell Package Point of Sale Packaged. we encounter our outboards not running properly. Idea's??? I don't have a temp guage or a pressure guage. Gamefishin. Welcome to our website to purchase brand new and genuine Yamaha F200,Suzuki DF200 and Honda BF200 outboard motor with free shipping worldwide and factory price. We have maintained the durable standard features that Tohatsu owners appreciate while making fuel-efficient 4-strokes that are easy to transport. The most common cold-weather outboard problem is something I call "duck hunter's freeze-up," which occurs when a hunter tilts up the outboard to keep it out of marsh muck or to pull a skiff ashore. I think it works too. The motor is constantly tested once a week. Record your outboard motor serial number in the spaces provided to assist you in ordering spare. Turn on the freshwater supply to the flush kit coupler. Many outboard companies produce such additives. I assume with it stuck open all that will happen is it will take a bit longer to warm up? Once up and running it will be fully open anyway. Running that outboard without a thermostat wasn't the same as running a 1957, which had no thermostat by design. 40-50hp motors follow the same approach of their smaller counterparts; the 40, 48, & 50 are essentially the same motor. FourStroke - Excellence without compromise Elevate your experience on the water with Mercury FourStroke outboards. E-tec 75 HP Outboard Motor pdf manual download. If an outboard is operated without a thermostat installed, it will surely suffer in some way from poor performance all the way to causing internal damage. Get YouTube without the ads. It’s a simple matter of removing the cylinder head cover. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created function(1. Busser is going off when I troll at lowest speed…does not go off when at idle nor at full speed, just when trolling at lowest speed…I put in a new impeller and still buzzer goes off when trolling…. Although you can. Suzuki 50 HP outboard motor keep overheating. Once removed, push and twist the thermostat and it all comes apart (easy refit). You're putt-putting along pretty as you please, when suddenly your outboard dies. 9 that the previous owner had removed the thermostat. I have a 2004 Yamaha 60hp two stroke outboard with a bad thermostat. Knowing what to ask when buying an engine from Yamaha, Mercury, Honda, or another manufacturer is critical. My 40 hp honda outboard isn't putting out any water from the teltale. left assembly or on the upper part of the bracket swivel. I have an overheating problem with my 175 hp Mercury outboard motor and don't know how to troubleshoot it. Ok, so I poked around looking for the answer as to whether or not one could start the engine out of the water by JUST connecting a hose with running water to the flushing adaptor, without muffs. The thermostat starts at a closed position when you start the engine to help it reach operating temperature. We reserve the right to make changes to this manual without prior notification. Second reason is the age of the impeller. Engine idle temperature should be checked at every scheduled service interval and thermostats replaced if needed. Only for use when engine is not running. The water pump is the heart of the cooling system. 50 & 48 motors are identical, the 48hp denotation was a marketing ploy to sell 50hp motors without oil injection or power trim at a lower cost, but the same HP output is seen by both. Find the user manual you need for your home appliance products and more at ManualsOnline. Hi, I have a 1987 Honda 8 outboard, and I have a feeling the thermostat has stuck. Even a few seconds operation without water can destroy the water pump impeller. Also, I would run 50:1 gas oil mixture as I bet the 100:1 is an EPA requirement to cut down on pollution. could find the actual hyperlink to attach to the choices plus publishing company of 1989 audi 100 thermostat manua PDF Full Ebook. A licensed electrician can typically set one up in fewer than two hours at a rate of $65 - $85 per hour. I would put the correct thermostat in it and see if you can make it over heat. Replacing an outboard thermostat can usually be done right on the engine. If given the choice only between overheating or running too cold for a short of time I pick too cold. Motor runs fine and no overheat light. Running the outboard in the cold no need to start your engine to spit water out whether or not your thermostat is open or closed, gravity will drain the water out. Since we could get the old one working, we decided to keep it. Re: can you run an old 2stroke outboard without thermostats? When I had an overheat problem with my Yamaha 115 2 stroke I took the thermostat out of one side (V4) for a short run to problem solve. They are cheap. 193): thanks Wrenchin i didnt think of a remote tank and will try that. It needs the thermostat. Question: I have a 2002 70hp yamaha outboard #70TLRZ. An outboard marine engine repair manual is a book of instructions, or handbook, for learning how to maintain, service and overhaul the 25 HP outboard motor to factory specifications. Fewer cylinders, same smooth ride. Get the best deal for Yamaha Boat Outboard Engines and Components without Warranty from the largest online selection at eBay. Running that outboard without a thermostat wasn't the same as running a 1957, which had no thermostat by design. It is important to keep your cooling system in good condition to maintain fuel efficiency and smooth engine idling. Fishing motors prior to 1955 commonly used a 16:1 ratio. Running an outboard without a thermostat Boating Forum. This article will explain the basic steps you can take to extend the life. YAMAHA OUTBOARD SALES. Failure of the Water PumpOne of the most common reasons behind overheating in outboard motors isfailure of the water pumps. Hi, I have a 1987 Honda 8 outboard, and I have a feeling the thermostat has stuck. 45hp mariner 2 stroke. NOTICE Running the engine without good water circulation can cause overheating and water pump damage. They’ll be locked in to what they agreed to. Maybe you have electrolysis going on between the metal in the thermostat and the aluminum in the outboard. Because it plays a crucial role in keeping the engine at a satisfactory temperature, allowing the engine to function, a damaged or otherwise failing thermostat can cause overheating. It is not good practice to run your outboard without water. Rated 5 out of 5 by DARRYL CHAUSSE from STANDARD FAN - TASTIC CEILING FAN VENT WITHOUT THERMOSTAT I purchase one of these from Camping World last year to replace the old small fan which is often standard in the bathroom of trailers, etc… so the wiring was already there. The thermostat prevents the water from starting to cool the motor too early in that process, to increase engine performance and reduce emissions. Finally, another nice touch is the potent 44-amp alternator which is nearly twice the output you'd expect to find on an outboard motor this size. This compact and lightweight motor are sure to have your back. I am running a Yamaha 60-HP two-cycle outboard motor. 8 hp 4-stroke has set the standard in portable outboard power! This lightweight motor weighs in at barely over the 80 lb mark and has undeniable characteristics of a true marine champion. Air is a very poor conductor of temperature and therefore will force a cooling system to overheat almost immediately if a significant amount is contained within the fluid. In fact, the mechanic took it out for me. You may hear the phrase "the thermostat was stuck open or closed. Information on the kits, their components, and their applications are all listed below. and smoother. And once you’ve paid a tech to drop the gearcase and. Understanding Your Engine's Thermostat. What does the "outboard" in outboard motor mean?. The thermostat is housed inbetween exhaust covers. Also, I would run 50:1 gas oil mixture as I bet the 100:1 is an EPA requirement to cut down on pollution. NOTE - Parsun outboards are water cooled. Large Capacity 19A Alternator The DF40A / 50A / 60A are equipped. 4) Check the Thermostat Although it is rare for the thermostat on an outboard motor to fail, it does occasionally happen. Said the hose attachment is used when you are remote without ability to run off the earmuffs (like when the boat is sitting overnight in salt water but you have fresh water in a dock hose). The 60 and 40hp SeaPro FourStroke engines come standard with the Command Thrust gearcase. A car thermostat regulates the flow of coolant through the engine and is an incredibly important player in the operation of your vehicle's engine. (45) For small 4 stroke engines, when transporting your outboard off the boat or when storing it, it is best to keep it in a vertical position. Go run to the end of your street and back in the middle of summer. com, the #1 full featured boating site in the world. It is that simple. Re: can you run an old 2stroke outboard without thermostats? When I had an overheat problem with my Yamaha 115 2 stroke I took the thermostat out of one side (V4) for a short run to problem solve. The 60 and 40hp SeaPro FourStroke engines come standard with the Command Thrust gearcase. To buy a thermostat for your 250HP F250TXRD Yamaha outboard motor, go to the CYLINDER CRANKCASE 1 component, find the Yamaha F250 outboard thermostat diagram and select item number 20. What you have is an intermittent problem that only happens at full throttle. a thermostat shows that first. An outboard thermostat will not get the temperature below what the internal thermostat allows. When buying an outboard motor, ensure that is the right size for the tender. If you have or can get an IR non-contact thermometer, Northern Tool had some for around $15, that will tell you what the water is doing. By Lenny Rudow. we encounter our outboards not running properly. 9 & 15 hp outboards 1974 - 1992 (Engine Troubleshooting) I am sure that sometime you may acquire a motor, or be asked to help with one that has sat for some time & or possibly will not start. Will an Outboard Run With Bad Compression. cylinder compression low; 1996+suzuki+6hp+outboard+pictures; 1998 mercury 6hp outboard motor thermostat operating. Another recommended procedure to thwart the wrath of ethanol-laced fuel is to regularly use a commercial fuel additive designed specifically for ethanol. If the tell-tale is streaming a steady stream of water--which it is--does that necessarily mean that all of the cooling components are working fine?. Also we noticed at high speed, there is no water coming out the telltale. Carb is emptied (it's better to empty the bowl than to run it dry). 5 mm² cable, which is not only guided through the bilge but also installed in such a way that the cable won't break under vibration. Many come with factory warranties and won't last long at these limited time blowout special prices. The specifications of outboards shown on this website may be changed or production discontinued without notice. The boat thermostat is an undervalued part of every craft. Hi, I have a 1987 Honda 8 outboard, and I have a feeling the thermostat has stuck. 4 Steps To Take If Your Outboard Quits. A licensed electrician can typically set one up in fewer than two hours at a rate of $65 - $85 per hour. However, where it differs from the Dorado is there is the addition of a ski plank running well forward which assists in the boat’s ability to get quickly and easily onto the plane. Suzuki Marine is truly unique. The 90 HP FourStroke Mercury outboard boat motor. If the thermostat become inoperative and stuck in the "cold" mode, it can cause overheating in the outboard motor. After about three hours it was like new, without having the pull. is there for a reason, running a motor to cool will allow for carbon buildup, blo-by, screwed up valves etc. Begin by connecting your garden hose to a faucet, hooking it to a motor flusher, placing this over the raw water intake, turning on the freshwater and starting your boat’s engine. At least I can get some higher rpms now,I assume from carb cleaning. Honda BF 225 Outboard 2005 The powerful Honda 225 horsepower has a large displacement V-6 engine, giving it outstanding torque. your source for Outboard Motor Parts. Your boat's speed and handling depend directly on the outboard engine used to power it. So does this fresh water get to the powerhead region or does it stay in the lower unit area? Is there a yamaha diagram on this mechanism? Yamaha's Answer: The Boater's Log - Volume 1, No. A little TLC and preventive boat motor maintenance will help with safe boating and keep your motor running well for years to come. FourStroke outboards (model year 2005 & newer). Maintenance Free Timing Chain The DF40A / 50A / 60A are the only outboards in this outboard class to incorporate a timing chain. the fuel bulb. Mercury FourStrokes have long led the pack in clean, quiet, fuel-efficient outboard power - and now the gap grows even wider. Busser is going off when I troll at lowest speed…does not go off when at idle nor at full speed, just when trolling at lowest speed…I put in a new impeller and still buzzer goes off when trolling…. Mercury - Mariner Thermostats and Gaskets Thermostat, Mercury / Mariner, 120° F. Turn the freshwater on before starting the engine; turn the water off after stopping the engine. assessed on the Outboard Motors module (SPC 022C), as part of a Class 6 Master/Engineer course. It’s a simple matter of removing the cylinder head cover. The 24-valve, six-cylinder design produces all the durability and performance of the smooth-running Honda Acura MDX it was based on-in a narrow, sixty-degree "V" profile outboard. The Yamaha outboard thermostat must be exposed in order to be changed. My 97-98 Mercury 40hp outboard won't start after it has warmed up. If the thermostat becomes stuck in the open position, there is continuous flow of coolant into the radiator causing the engine to run cold. Run engine with Salt-Away flushing through the cooling system. Can I Run My Outboard Without The Thermostat? Yes, you can temporarily run your outboard without the thermostat and not harm the engine. Just flip the T stat around, your probably correct that you put it in backwards. A couple days ago I hooked up a garden hose to an outboard fresh water flushing adapter so I could run the engine while mounted on the rail of the boat (this supplies cooling water to the motor when it is not sitting in the water). It allows the engine to run cooler than the standard 82°c thermostat for engines with early hot water tanks or cruising in warmer waters. Having or not a thermostat makes no difference at such point. Tohatsu outboards were originally developed for commercial Japanese fishermen who needed a motor that could run for days on end, no matter what the weather. FourStroke - Excellence without compromise Elevate your experience on the water with Mercury FourStroke outboards. N (Neutral) position. the fuel bulb. More specifically I have a 135hp V6 Mercury Blackmax outboard from approx 1985. First, examine the clip on the outboard's fuel joint, where the fuel hose comes into the engine. Polished Stainless Thermostat Kit For Chevy. This portable 2. 1994 6hp evinrude running without thermostat; 1995 6hp merc outboard 2 cyc fuel mix; 1996 mercury outboard 6hp. Should i be worried? Any ideas short of changing the impellor? Mike. Some models need the restriction of the thermo to flow the water properly through the motor. Did the same thing with my outboard motor, because of constant overheats from marsh grass.