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symptoms of fouled spark plug 2 stroke outboard

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

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