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

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