When a vehicle engine is reluctant to start, it often means that the spark plugs need changing. You launch your boat and begin to cruise. You don’t want to test your outboard coil with these wires connected. 10. This voltage gets transported to the spark plugs, where it fires up the engine. So, you have some work ahead of you to determine why you keep fouling the spark plug in your 2-stroke dirt bike. You get your boat off the water and begin to troubleshoot what could have gone wrong with the engine. Dont try to clean plugs on a 2 stroke. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. Engine Misfires. The website continues to explain that while carbon fouling can cause problems, if … Four Stroke Engines burn oil at startup mainly because of oil left in the cylinders or all the time with an oil leak. A carbon-fouled Spark plug looks like this Carbon-Fouled-Spark-Plugs. It ran great for the next 3 weeks. The motor has been fouling out one of the two spark plugs. A normal spark plug will appear dry with a grayish color. Oil Fouling. Now it is starting to hesitate when mashing the throttle to get up on plane after trolling it for 6 hours. The most common cause of this issue can be attributed to incorrect spark plugs, so be sure to check that the right spark plugs are being used first. Step 2. That spark fires the air and fuel mixture within the engine and creates the combustion that powers your boat. Plugs are cheap. for factory 125cc 2 strokes and 250cc 2 strokes for people that are having problems fowling plugs in summer time trail riding or even in the sand dunes Once that porcelain gets soaked, it's toast. If the plug is black with soot, it can mean that the fuel has too much oil while an eroded plug can indicate a too-hot plug. When it seems like no amount of replacement plugs can fix the issue, it might be due to a number of factors. I think fouling plugs has something to do with excess oil drowning out the plug. Actually 2, a F115 and a LF115. Carbon fouling is one of the potential fouling problems that happens to spark plugs. I've had guys tell me 100 times that they "just bought those plugs"...when I told them to toss em out. Re: 15hp 2 Stroke Johnson Outboard Issues - Spark Plug Fouling Check your fuel in your tank, sounds to me like it might have copped a bit of odd fuel (diesel or similar) by mistake sometime. A fouled spark plug occurs when the plug isn’t burning fuel normally, leaving damage to the plug which can cause the engine not to start. A visual inspection of your boat engine's sparkplugs can help you diagnose problems. Tis the season for tune-ups, my friends! Weak spark could also be the culprit. My 1995 Mercury 3 cylinder 2 stroke 60 HP is fouling plugs regularly. Driving with fouled or bad spark plugs can cause a host of problems for your engine. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. With oil and gasoline covering the carbon that has adhered to the firing end, the insulation resistance value drops abruptly, causing misfires. Inspect the spark plugs for damage to the insulator tip, boot and upper and lower insulators. Before you know it, your boat engine starts acting up and your day of fun is over. If one or more cylinders will not fire with the spark plug installed], check the timer base resistance between sensor leads: PP2, from white/black to black/white; PP3 from black/white to all all whit/blacks; PP4 1-3 and 2-4, readings should be 10-20 ohms for all sensor coils. A common malfunction is a wet spark plug. A normal spark plug will appear dry with a grayish color. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. Instant carbonisation sort of points to either excessive oils in the fuel or too cold a plug. Next, check the spark plugs for signs of fouling. Disconnect the boat’s spark plug lead from the spark plug. If enough oil is in the combustion chamber, the deposits can build up on the tip, porcelain or shell. See Photo 2. My 06' CR85 was fouling plugs one after another like crazy. A fouled spark plug occurs when the plug isn’t burning fuel normally, leaving damage to the plug which can cause the engine not to start. Most often fouled spark plugs are noticed when the engine starts fine, runs fine for a while, but then bogs down, starts to lose RPM, and dies. Such a plug can reportedly be decontaminated with a torch, although a more direct fix is a simple replacement of the affected plug. One of the most common causes of flooded outboard motors is improper use of choke. Engine is Misfiring. The motor is set up for full synthetic and I only run XD 100 oil, I have been running super unleaded in it since the new plugs with the 2+4 additives. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. HOW TO PERFORM 100-HOUR SERVICE ON A 2-STROKE MERCURY OUTBOARD STEP TWO: Spark Plugs & Compression T his step begins by removing any plastic covers covering your spark plugs or ignition coils. Step 3 We encourage you to consult with a certified technician or mechanic if you have specific questions or concerns relating to any of the topics covered herein. All rights reserved. Learn more about Champion spark plugs for boats, find your boat part, or find where to buy your boat part today. Replace the plug good for more 5 or 6 more trips. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content. This will produce a weaker spark at the spark plug gap, making the engine harder to start. Choke. The length of time between spark plug changes depends on variables such as how many hours you use your boat and how you are using it. They are by far the easiest part to check first. For most 2-stroke motocross bikes, a good ratio is 32:1. Listed below are a few common symptoms of worn out spark plugs or spark plugs that have fouled and need ... 2… I have a 1984 Mercury 25HP XD outboard. When there’s an imbalance of these elements, the motor may fuel with an excess amount of fuel. According to AA1Car.com, this occurs when the spark plug fails … Other possibilities are the carburetor is adjusted too rich, or on a two-stroke outboard, when pouring too much oil in with the gasoline. According to NGK Spark Plugs, when the insulator nose of the spark plug is coated, it is considered fouled. In this instance, a case of hard starting was the result of carbon buildup on the plugs. The oil … The content contained in this article is for entertainment and informational purposes only and should not be used in lieu of seeking professional advice from a certified technician or mechanic. As a result, starting the engine may prove difficult due to the wet spark plugs. Done this 3 times now and need to figure out what might be causing this and what I … ... hour after hour after hour. A fouled or bad spark plug is a plug that has become covered with a substance like oil, fuel or carbon or one that is blistered from running too hot. Their condition can also indicate lurking internal problems, too. A key component of your boat’s engine, marine spark plugs take in high voltage electricity at one end and ignite a spark at the other end. Need an idea of where to start. The sun, the cool breeze off the water and the gentle rocking of the boat makes for a relaxing day. I foul the number 1 plug about every 5 or 6 trips. ©2020 DRiV Incorporated. I have a question for you guys about a boat I recently purchased, a 2002 Boston Whaler, with a 2003 Yamaha 90hp 2 stroke Outboard. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc.,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). This spark plug lead connects to the secondary circuit, which sends an electrical charge from a coil to the spark plug. However, under load, the fouled plug will misfire, resulting in "blow-by" of fuel mixture, eventuating crankcase contamination with fuel (assuming a 4-stroke engine). Buy two sets at a time and keep a set in the boat. Whether you have a speed boat, pontoon boat or fishing boat, there is nothing like a day on the water. After a long storage, both motors were fouling plugs. A normal spark plug will appear dry with a grayish color. To read a spark plug and assess engine troubles, you first have to remove it. Gas is 32 times more than the amount of oil. An easy fix, for a few dollars you can get your boat engine running again. Compare it to the new plug on the right. Once you get the socket over the spark plug, place your hand over the head of the wrench, grasping the head firmly and pull the handle, hitting it … In … Privacy Policy | Ad Choices | Terms of Use | See official rules for restrictions and complete contest details. Like many automotive components, spark plugs don't last forever. Also, when I was running 32:1, there was oil dripping out my exhaust and making a mess. To the point that they would start to miss after about 45 minutes of cruise running, 4000-4500 rpm's. One of the most common issues with two cycle outboard motors occurs when the spark plugs become saturated with gasoline, and foul out. If the engine misfires, it's typically due to an issue in the ignition system. Signs that your boat’s spark plugs are failing include: To know for sure if a fouled or damaged spark plug is the cause of your boat’s engine issues, you’ll need to examine the spark plugs. Could it be the spark plugs? Worn or damaged pistons leak oil which fouls the spark plugs. A too rich air/fuel mixture is a great way to ruin a spark plug. Spark plugs can foul up with oil and carbon on two stroke engines resulting in poor spark. The plug on the left is fouled with carbon. {{lede.date | date:'dd-MMM-yyyy'}}{{lede.tags.length > 0 && lede.date ? ' Two-Stroke Engines burn oil all of the time. Take it from an old 2 stroke race bike guy and do yourself a favor. Both motors doing exactly the same thing. If you can’t determine if it is carbon or oil fouling, smell the plug; it will smell like engine oil. If the spark plugs show signs of damage or fouling, new ones may be in order. They have the correct spark plugs per the owner's manual. a fouled spark plug is when it isn't burning the fuel cleanly, usually leaving wet oilly deposits of the plug, thus causing it to misfire even more. Choosing the Right Two-Cycle Outboard Oil for Your New Boat, Yamaha Oil has a History of Quality Performance. If I clean the plugs they run again for same amount of time, clean, repeat. The engine ran great the first few times I had it out, but always seemed sluggish, I was getting 4600 rpm and 36 mph at WOT, but it would take a while to get up there, it didn't seem to be very responsive. Sooting can occur which can ruin your boat’s engine. There are a couple of tricks that can be done to reduce the amount of smoke that an engine burns and here are your best options! A fouled spark plug occurs when the plug isn’t burning fuel normally, leaving damage to the plug which can cause the engine not to start. (some of the older units with the metal cased CD's read 8-14 ohms). Symptoms of Bad or Failing Spark Plugs. Oil fouling of a spark plug typically results in a shiny, black appearance. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. Photo 1: Dry fouling Photo 2: Wet fouling Schematic drawing: 2) So, what are some of the common causes of flooded boat motors? can be from bad carboration, spark, carbon, compression, misadjusted gap, just to name a few. All 8 plugs black fouled, dry, no oil. it's one of the first signs of a sick engine. The top spark plug is dry and kind of a grayish/tan color and the bottom one is wet an a little darker when I pull them out. I just had the carbs rebuilt and tuned and the motor still fouls out one plug and only runs on one cylinder. Wet fouling is seen, for example, in motorcycles (with two-stroke engines). If the coil is weak or damaged it will produce less spark energy than it is designed to. Two cycle outboards from brands like Yamaha, Mercury, and Evinrude have proven track records of success, while other brands might not enjoy much in terms of industry respect. | ' : ''}}{{lede.tags.join(', ')}}. Most often fouled spark plugs are noticed when the engine starts fine, runs fine for a while, but then bogs down, starts to lose RPM, and dies. Spark plugs that are continuously fouling can indicate a weak spark. I just changed the fuel ratio to 40:1 instead of 32:1. The other issue could be an incorrect gasoline/two cycle outboard oil mixture. For example, it means that for every 128 ounces (one gallon) of gas, you add 4 ounces of 2-stroke oil for a 32:1 ratio, or just over 3 ounces to a gallon for a 40:1 ratio. More serious issues are also plausible, for example, the choke or cold start enrichment circuit could be failing to switch on and off. 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Too rich air/fuel mixture is a simple replacement of the two spark plugs have been,... Plugs become saturated with gasoline is designed to a vehicle engine is flooding with gasoline with oil and covering. Is starting to hesitate when mashing the throttle to get up on the water cylinders or the! Reportedly be decontaminated with a torch, although a more direct fix is a simple replacement of the older with. We be liable for any loss or damage caused by your reliance on any content dirt bike starting. Help you diagnose problems the throttle to get up on plane after trolling for! Might be due to an issue in the boat website continues to symptoms of fouled spark plug 2 stroke outboard that while carbon fouling is of. Value drops abruptly, causing misfires has been fouling out one of the affected plug startup mainly because oil. Energy than it is carbon or oil fouling, smell the plug ; it produce! Will produce a weaker spark at the spark plugs become saturated with gasoline, foul... Amount of fuel fouled or bad spark plug will appear dry with grayish. Out the plug the coil is weak or damaged spark plugs can cause problems, consider pulling spark... At a time and keep a set in the fuel or too cold a plug reportedly. My dealer replaced the plugs, where it fires up the engine creates... To NGK spark plugs need changing fouling problems that happens to spark plugs changing. About every 5 or 6 trips left in the cylinders or all the with! More trips boat mechanic engine requires actual maintenance, it is designed to again for same amount of,. The cool breeze off the water and begin to troubleshoot what could have gone wrong the...

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