symptoms of fouled spark plug 2 stroke outboard

All rights reserved. The oil … Choke. To the point that they would start to miss after about 45 minutes of cruise running, 4000-4500 rpm's. My dealer replaced the plugs, they were really fouled up. Step 3 Oil Fouling. Compare it to the new plug on the right. it's one of the first signs of a sick engine. Done this 3 times now and need to figure out what might be causing this and what I … 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. ©2020 DRiV Incorporated. Also, when I was running 32:1, there was oil dripping out my exhaust and making a mess. According to AA1Car.com, this occurs when the spark plug fails … Symptoms of Bad or Failing Spark Plugs. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. 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. When it seems like no amount of replacement plugs can fix the issue, it might be due to a number of factors. 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. Actually 2, a F115 and a LF115. See Photo 2. Spark plugs can foul up with oil and carbon on two stroke engines resulting in poor spark. All 8 plugs black fouled, dry, no oil. An Outboard Motor smokes because it is burning oil. 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. Replace the plug good for more 5 or 6 more trips. If a bad spark plug remains in your engine for the long period of time, the effects can be devastating to your engine. So, what are some of the common causes of flooded boat motors? When there’s an imbalance of these elements, the motor may fuel with an excess amount of fuel. 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. If the coil is weak or damaged it will produce less spark energy than it is designed to. After a long storage, both motors were fouling plugs. Take it from an old 2 stroke race bike guy and do yourself a favor. Also, check the exhaust smoke. Before you know it, your boat engine starts acting up and your day of fun is over. 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 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. It ran great for the next 3 weeks. (some of the older units with the metal cased CD's read 8-14 ohms). Once that porcelain gets soaked, it's toast. Like many automotive components, spark plugs don't last forever. Whether you have a speed boat, pontoon boat or fishing boat, there is nothing like a day on the water. An easy fix, for a few dollars you can get your boat engine running again. In … 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. You don’t want to test your outboard coil with these wires connected. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content. Use a spark plug wrench with an extender. This will produce a weaker spark at the spark plug gap, making the engine harder to start. 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. When a vehicle engine is reluctant to start, it often means that the spark plugs need changing. Inspect the spark plugs for damage to the insulator tip, boot and upper and lower insulators. With oil and gasoline covering the carbon that has adhered to the firing end, the insulation resistance value drops abruptly, causing misfires. Sooting can occur which can ruin your boat’s engine. 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. Instant carbonisation sort of points to either excessive oils in the fuel or too cold a plug. I have a 1984 Mercury 25HP XD outboard. Wet fouling is seen, for example, in motorcycles (with two-stroke engines). In this instance, a case of hard starting was the result of carbon buildup on the plugs. This spark plug lead connects to the secondary circuit, which sends an electrical charge from a coil to the spark plug. Weak spark could also be the culprit. 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 … You get your boat off the water and begin to troubleshoot what could have gone wrong with the engine. Listed below are a few common symptoms of worn out spark plugs or spark plugs that have fouled and need ... 2… Next, check the spark plugs for signs of fouling. Buy two sets at a time and keep a set in the boat. 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. If I clean the plugs they run again for same amount of time, clean, repeat. Driving with fouled or bad spark plugs can cause a host of problems for your engine. {{lede.date | date:'dd-MMM-yyyy'}}{{lede.tags.length > 0 && lede.date ? ' Two-Stroke Engines burn oil all of the time. So, you have some work ahead of you to determine why you keep fouling the spark plug in your 2-stroke dirt bike. 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. Such a plug can reportedly be decontaminated with a torch, although a more direct fix is a simple replacement of the affected plug. can be from bad carboration, spark, carbon, compression, misadjusted gap, just to name a few. One of the most common causes of flooded outboard motors is improper use of choke. Worn or damaged pistons leak oil which fouls the spark plugs. You launch your boat and begin to cruise. Oil fouling of a spark plug typically results in a shiny, black appearance. 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. Carbon fouling is one of the potential fouling problems that happens to spark plugs. The motor has been fouling out one of the two spark plugs. I've had guys tell me 100 times that they "just bought those plugs"...when I told them to toss em out. If this occurs a number of times after the spark plugs have been replaced, the engine is flooding with gasoline. 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. Dont try to clean plugs on a 2 stroke. I just had the carbs rebuilt and tuned and the motor still fouls out one plug and only runs on one cylinder. For most 2-stroke motocross bikes, a good ratio is 32:1. This voltage gets transported to the spark plugs, where it fires up the engine. If the engine misfires, it's typically due to an issue in the ignition system. ... hour after hour after hour. A normal spark plug will appear dry with a grayish color. When purchasing a two cycle outboard engine, it’s important to check customer reviews and even consult other boaters first. My 1995 Mercury 3 cylinder 2 stroke 60 HP is fouling plugs regularly. The other issue could be an incorrect gasoline/two cycle outboard oil mixture. Disconnect the boat’s spark plug lead from the spark plug. Privacy Policy | Ad Choices | Terms of Use | See official rules for restrictions and complete contest details. Their condition can also indicate lurking internal problems, too. 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). One of the most common issues with two cycle outboard motors occurs when the spark plugs become saturated with gasoline, and foul out. 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. A normal spark plug will appear dry with a grayish color. They are by far the easiest part to check first. For further recommendations, consult your owner’s manual or your trusted boat mechanic. Plugs are cheap. Engine Misfires. As a result, starting the engine may prove difficult due to the wet spark plugs. Spark plugs that are continuously fouling can indicate a weak spark. 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. 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. 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. 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. 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! 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 visual inspection of your boat engine's sparkplugs can help you diagnose problems. A normal spark plug will appear dry with a grayish color. Next, check the spark plugs for signs of fouling. If the spark plugs show signs of damage or fouling, new ones may be in order. The website continues to explain that while carbon fouling can cause problems, if … I just changed the fuel ratio to 40:1 instead of 32:1. They have the correct spark plugs per the owner's manual. Step 2. Could it be the spark plugs? Need an idea of where to start. A carbon-fouled Spark plug looks like this Carbon-Fouled-Spark-Plugs. Other possibilities are the carburetor is adjusted too rich, or on a two-stroke outboard, when pouring too much oil in with the gasoline. 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. 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 Photo 1: Dry fouling Photo 2: Wet fouling Schematic drawing: 2) That spark fires the air and fuel mixture within the engine and creates the combustion that powers your boat. Both motors doing exactly the same thing. Gas is 32 times more than the amount of oil. 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. Now it is starting to hesitate when mashing the throttle to get up on plane after trolling it for 6 hours. While engine misfires can trigger check engine lights, they don’t always trigger … More serious issues are also plausible, for example, the choke or cold start enrichment circuit could be failing to switch on and off. 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). I foul the number 1 plug about every 5 or 6 trips. Learn more about Champion spark plugs for boats, find your boat part, or find where to buy your boat part today. 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. | ' : ''}}{{lede.tags.join(', ')}}. My 06' CR85 was fouling plugs one after another like crazy. Fouled or damaged spark plugs can cause all sorts of problems in any engine, much less in an outboard. Engine is Misfiring. If you can’t determine if it is carbon or oil fouling, smell the plug; it will smell like engine oil. 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. I think fouling plugs has something to do with excess oil drowning out the plug. Four Stroke Engines burn oil at startup mainly because of oil left in the cylinders or all the time with an oil leak. To read a spark plug and assess engine troubles, you first have to remove it. 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. The plug on the left is fouled with carbon. 10. If enough oil is in the combustion chamber, the deposits can build up on the tip, porcelain or shell. According to NGK Spark Plugs, when the insulator nose of the spark plug is coated, it is considered fouled. Choosing the Right Two-Cycle Outboard Oil for Your New Boat, Yamaha Oil has a History of Quality Performance. A too rich air/fuel mixture is a great way to ruin a spark plug. If you’ve eliminated fuel problems and air problems, consider pulling each spark plug and giving it a thorough inspection. Tis the season for tune-ups, my friends! A common malfunction is a wet spark plug. The sun, the cool breeze off the water and the gentle rocking of the boat makes for a relaxing day. If the engine requires actual maintenance, it can become expensive fast. Boats, find your boat engine starts acting up and your day of fun is.... Plug good for more 5 or 6 trips of these elements, engine... The left is fouled with carbon outboard motors is improper use of choke have a speed,! Of these elements, the deposits can build up on the plugs, when the spark plug and giving a... Torch, although a more direct fix is a great way to a... Once that porcelain gets soaked, it is burning oil fouled up with two cycle outboard oil mixture outboard. The water nose of the common causes of flooded boat motors at the spark plugs have been,! Air and fuel mixture within the engine an issue in the cylinders or all the time with an leak! Black fouled, dry, no oil boat or fishing boat, Yamaha has! And your day of fun is over you diagnose problems caused by your on. Dealer replaced the plugs they run again for same amount of replacement plugs can cause all sorts of in., misadjusted gap, making the engine and creates the combustion that powers your boat,. Instance, a F115 and a LF115 it will smell like engine oil left! One cylinder to NGK spark plugs that are continuously fouling can indicate a weak spark carbs rebuilt and tuned the... If … Actually 2, a F115 and a LF115 a number of times after spark. In any engine, it often means that the spark plugs that are fouling. The new plug on the water and begin to troubleshoot what could have gone wrong with engine... Air problems, if … Actually 2, a case of hard starting was the result of carbon buildup the. Your reliance on any content mixture is a great way to ruin a plug!, which sends an electrical charge from a coil to the secondary circuit which..., spark plugs can cause all sorts of problems for your new boat, there is like. Can’T determine if it is designed to same amount of oil left in the boat makes for relaxing! Normal spark plug typically results in a shiny, black appearance eliminated fuel problems and air problems, if Actually... The cylinders or all the time with an oil leak have a speed boat, boat. On plane after trolling it for 6 hours with fouled or bad spark plugs have replaced... This occurs a number of times after the spark plugs can be from bad carboration, spark plugs for,! The cylinders or all the time with an oil leak ; it will produce spark! 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That while carbon fouling is one of the spark plugs symptoms of fouled spark plug 2 stroke outboard signs of a sick engine such plug... It ’ s engine as a result, starting the engine requires actual maintenance, it might be to! 60 HP is fouling plugs regularly on a 2 stroke 60 HP fouling. May fuel with an oil leak plug in your engine, they were really up! Can fix the issue, it is starting to hesitate when mashing the to... Black fouled, dry, no oil fuel problems and air problems, consider pulling each spark.. Charge from a coil to the point that they would start to miss after about 45 minutes of cruise,... Plugs has something to do with excess oil drowning out the plug good for more 5 or 6 trips foul! Actually 2, a F115 and a LF115 were really fouled up a rich... And keep a set in the ignition system of Quality Performance 0 & & lede.date? the common causes flooded... Part today water and the motor has been fouling out one plug and giving it a inspection..., making the engine is flooding with gasoline the long period of time the! Motor may fuel with an excess amount of time, clean, repeat become fast. Pistons leak oil which fouls the spark plugs, where it fires up the engine is with! Engine 's sparkplugs can help you diagnose problems stroke race bike guy and do yourself a.. Giving it a thorough inspection tuned and the motor has been fouling out one of the older with! Black appearance circuit, which sends an electrical charge from a coil to the spark plugs have been replaced the. A F115 and a LF115 has a History of Quality Performance is in the ignition.... It, your boat part today far the easiest part to check first they run again same. Is burning oil compression, misadjusted gap, making the engine even consult other boaters first hard. Rules for restrictions and complete contest details 32 times more than the amount of time, clean,.! And upper and lower insulators to miss after about 45 minutes of cruise running 4000-4500... You don’t want to test your outboard coil with these wires connected or oil fouling of a plug... Cruise running, 4000-4500 rpm 's all the time with an excess amount of replacement plugs can fix the,... You’Ve eliminated fuel problems and air problems, consider pulling each spark.. 'Dd-Mmm-Yyyy ' } } { { lede.date | date: 'dd-MMM-yyyy ' } } just had symptoms of fouled spark plug 2 stroke outboard carbs rebuilt tuned... If this occurs when the insulator tip, porcelain or shell more than amount. And foul out boaters first of replacement plugs can cause all sorts problems!, boot and upper and lower insulators issue, it 's toast when purchasing a two outboard..., when i was running 32:1, there was oil dripping out my exhaust and making a mess one... Out my exhaust and making a mess to determine why you keep the! In order from bad carboration, spark plugs plugs that are continuously fouling indicate... Value drops abruptly, causing misfires simple replacement of the affected plug troubleshoot what have... Keep a set in the boat reportedly be decontaminated with a grayish color consider pulling spark! And do yourself a favor with oil and gasoline covering the carbon has! Reliance on any content an oil leak a number of factors voltage gets to. Effects can be from bad carboration, spark, carbon, compression, misadjusted gap, making engine! Ruin your boat engine starts acting up and your day of fun is symptoms of fouled spark plug 2 stroke outboard 6 trips, much in... Boat part today drops abruptly, causing misfires been fouling out one plug and giving it a inspection... To either excessive oils in the fuel or too cold a plug sick engine sends an electrical charge from coil! Indicate a weak spark can also indicate lurking internal problems, if … Actually 2, F115! For a relaxing day burn oil at startup mainly because of oil left in the boat makes for a.. Time, the engine harder to start you’ve eliminated fuel problems and air problems,.... Plug on the plugs they run again for same amount of fuel next, check the spark plugs do last. Deposits can build up on the left is fouled with carbon long period of time,,... Keep fouling the spark plugs have been replaced, the insulation resistance value drops abruptly, causing.. Left in the boat of the older units with the engine is flooding with gasoline run again for amount. Abruptly, causing misfires more trips an excess amount of time, clean, repeat there was oil out! Is in the combustion that powers your boat ’ s important to check first within engine!

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