The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. The too lean setting is especially dangerous, since a carburetor is automatically too lean when engine modifications are applied, but the carburetor is not adjusted accordingly. Now, ive got a NGK BR9EIX iridium spark plug, and looks like it’s running too lean… WTF? The carbon will look black and fluffy if it is to rich. Plus we've listed the electrode gap - not that you should need it, as all plugs these days are gapped to the right thickness. You described clearly about the maintenance system of it.it will be helpful for us.keep posting like this. It is also possible that you can have carbon deposits on the plug because of dry air filter. Running a tuned scooter requires attention to details. It may not display this or other websites correctly. More hp , more torque? Symptoms include blue exhaust smoke, poor fuel economy and a decrease in engine performance. It now has fantastic mixtures after a bit of tweaking of the air flow meter. Given the explanations above about too lean and too rich setups it is also always a safer approach to go a bit richer with your setting. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. You’ll feel better […] Or just no difference? He shares his knowledge to us free of charge. Dry and Wet Fouling. Spark plugs are either resistor or non-resistor types (fig. There should be no spillage of oil and petrol from the exhaust and the engine should basically perform as new. 2. The optimal one shows a clean insulator, but not burned. Yeah dude your picture is wrong…. Btw, the iridium spark plug will ensure better performance than standard spark plugs? please review. for over thirty five years. Low-octane, as well as high-octane gasoline fuels in a rich mixture leave carbon compound deposits on the spark plug porcelain. lean is optimal. How the Spark Plug Works . Normal gap specifications range between .030 to .060 inch. The center electrode ends in a gold or palladiu… If your setting is too lean you will notice a whiteish texture on the tip of the plug. 5kms should usually be pretty good to get an idea. Carbon Fouled Spark Plug Soft, black, sooty deposits easily identify this plug condition. Tip of electrodes checks idle mixture adjustment and pilot jet with air screw 1 3/4 to 2 turns out from closed. Fang it and that to will change the color of your plugs. Providing you have the correct heat range plug, base of insulator deep inside is read to check main jet. Make runs also at 1/2 throttle to check needle position. This plug eventually fouled and the bike would not start. or the coolant? Let me know in the comments if you have any questions. I suspect that the plugs weren't torqued right or snug enough, after torquing them again and letting the car idle, it made no difference. When changing your spark plugs, you may have some difficulty loosening a spark plug for the first time. I know the ECU temp thingy works as it used to light up when I was having over heating issues (the big red STOP light would light up....). These spark plugs are the NGK-R (Resistor Style) spark plugs for the small block ford 302 roller engine. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Check out how to diagnose and fix this common problem. Whilst you can not damage your engine with a too rich setting, you face a loss of power and increased petrol consumption. Setting the engine up !! ©2015 TuningMatters.comConcept and Development Daniel-Klose.com, How To Check Your Spark Plug for the Correct Carburetor Setting. The worst thing to happen is a seizure of the piston due to the high heat which usually renders the cylinder kit unusable. Check for a sticking choke, clogged air … Se excluye cualquier tipo de responsabilidad por parte del fabricante por los daños que resultaren de modificaciones arbitrarias realizadas sobre el aparato. A hot plug may be a good option if your spark plugs are fouled from carbon deposits, your engine has a rich air-fuel ratio or burns oil, or if you do a lot of local low-speed driving. Thanks Jamie! Also, the spark plug might be slightly wet on it’s thread, which causes the spillage around the cylinder head. Spark plugs are critical for providing that essential charge required for combustion. your lean plug is supposed to be optimal.. optimal is brown not white.. you are going to be responsible for blowing up peoples top ends you dick. The spark plugs themselves do not cause a rich mixture. Sorry, I didn't realise 205GTi's had oxygen sensors. Also, find me on Google+, or Twitter, you need to read this ! Increasing the amount of air is usually an easy thing as we can simply apply a racing air filter, or modifiy the stock air box to allow for a better air flow. As I said in another post, Adrian Wuillemin has a new fast acting Uego O2 meter, which will tell you the exact mixtures after a short drive. One of the most common causes of carbon fouling is having a very rich fuel-air mixture. A lean spark plug will have little to no color on the insulator tip. This means there is too much air in the mixture which causes the explosion within the cylinder getting too hot. Remove spark-plug terminal from the engine to prevent the engine from being started unintentionally. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. Grease, sludge, and other junk may have caused the plug to stick in place, especially if it’s been a long time since it was changed. Dark coloring, such as heavy black wet or dry deposits, can indicate an overly rich condition, too cold a heat range spark plug, a possible vacuum leak, low compression, overly retarded timing or too large a plug gap. But, if the spark plugs are faulty then you will have incomplete fuel burning. If not, then look no further. With help from the spark plug experts at NGK, we’ll teach you how to diagnose minor tuning issues or potentially major engine problems by examining your spark plugs.Check out the images below, courtesy of NGK Spark Plugs, and get ready to do a little light reading the next time you pull your spark plugs.. Normal. The spark plug is a great indicator, to see if the carburetor settings are correct. Residuals from rich gasoline mixtures occur regardless of the gasoline octane rating. The opposite of the too rich setting is the too lean setting. Rich running conditions: If your engine is running too rich, the spark plug will be black and sooty. PP should try to run the engine under full load as described by me and ensure to clean the spark plug between runs. JavaScript is disabled. If you live on a mountain and take a trip down to the coast you might want to increase your main jet size or tape that air filter before you leave to ensure a pleasant trip. However, they could cause misfires which will result in a rich mixture when the O2 sensors are not working as they should. This is a quick way to solve the problem but ultimately we should consider increasing the main jet size to match the amount of air provided by the air intake system. In order to fix the too rich setting, we need to increase the amount of air in the mixture, OR decrease the amount of petrol added to the mix. It may also be that your grandma driving it a bit. As a result, the spark plug is functioning optimally. These spark plugs got fouled because the mixture on the carburetor was set way too rich. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. Spark plug gap is the distance between the center and side electrodes. Also remember that air tends to get denser at sea level. Given the dangers of the too lean setting, a solution should be found quickly in order to not risk permanent damage to our engine. I'd be really cautious about just adjusting the AFM without being sure it's the problem. Hi Rider, The manufacturers always try to sell their products at a higher price :) Whilst it is probably true that you see a performance difference in an F1 engine, it is unlikely that there is any measurable or neven noticable difference on a scooter engine :) For how long did you ride the new plug? White, no color on spark plug: Too lean. This should help to get more precise results. Tho, it also becomes more safe to run a step above or below, which then allows for longer rides and thus more accurate spark plug reading results! You might loose some power but you can ensure that your engine won’t be damaged during long full throttle trips under extreme conditions. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. We've listed the standard plug replacement and the iridium upgrade. The source is telling to read spark plugs based on the burned dimensions on the ground electrode which should be 1.5mm or less and not the color of the ceramic insulator because as you can see, the ceramic insulator color and optimal spark in this case is burned? If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. Smaller spark plugs gaps are used on older vehicles equipped with contact point ignition systems. Is it the oil? Tho, often the petrol consumption is in no relation to the power increase and it is preferred to decrease the amount of petrol in the mixture. Hi just a quick one? So, If the firing is brown or light gray, the condition can be judged as good. Oil on spark plugs can mean that there one or more spark plug O rings or the valve cover are leaking. Especially the carburetor needs to be adjusted when increasing the performance by installing a new cylinder kit, or exhaust pipe. Rich spark plug color. Normal Condition. Get involved in the comments, or post to the forum to make this page more fun for everyone. Enter your email address to subscribe and receive notifications of new posts by email. 2-46). Suggest you shove your head back up your arse where it belongs. Mine, by your description, were running lean. you got your spark plug reading all wrong. Reinstall the clean spark plug and ride the scooter for about 100-200m under complete load (full throttle), ideally up a hill. The spark plug is the essential thing of a vehicle. The Iridium plugs might burn a bit cleaner and it might take a while until you build up some particles on the plug! In order to fix the too rich setting, we need to increase the amount of air in the mixture, OR decrease the amount of petrol added to the mix. http://www.pedparts.co.uk/blog/introduction-to-moped-jetting#moped-plug-chop. If you zoom in on a spark plug’s tip, as we have done in the image above, you can see that there is a central electrode that sticks up and a side electrode that curves around it. I don’t have a scooter I have a 8 cylinder truck and you are the only one I could understand in determining my plugs. Hi, I’m Daniel I write this blog and love scooters! The optimal carburetor setting is found when the engine performs well in cold state, when the choke is applied and revs up evenly in warm state. If your carb setting is too rich you will notice oil spillage on the tip of the plug. The spark plug should be replaced. I was wondering if i change my air filter with K&N Cone with its Cotton based filter, will it make my engine too lean? Hey Timothy Seward Anyone can make a mistake so don’t be so objectionable by call the author a DICK. Peace, Daniel! Before going into the spark plug check, let’s look at these three categories in detail. Lean running conditions: If your engine is running too lean, the spark plug will be white. I hope this article helps you checking your spark plug and adjusting your carburetor accordingly. Also there is a spec,setting,say from .06 mm.-.07 mm.or 24-28 in.I tried in so .either to rich or lean.What is best? If you want to know how to make extra money, search for: best adsense alternative Dracko’s tricks, Thanks for sharing such an informative article. Hi daniel, i had a Shitty spark plug on my polini Sport, equivalent with the NGK B9ES, the color of the spark plug was chocolate brown. I ride the new spark for 5kms and now its chocolate brown, how good it is? yard-man.biz. According to NGK Spark Plugs, when the insulator nose of the spark plug is coated, it is considered fouled. The left plug looks to be optimal with a grey brown colour from the light deposits of a correctly adjusted mixture. If you continue to use this site we will assume that you are happy with it. yup pictures are the wrong way around,anything looking white is lean or hot,hopefully not too many people go by the pics. Hope this gets my point over a bit better! Like spark plug wires. How about this photo. Rich running engines have spark plugs that smell like gasoline. Fire requires three components: oxygen (O2), fuel, and heat.In your engine, every time a cylinder pulls an intake stroke, it pulls in air (≈21% O2).Port-injection engines inject fuel during the intake stroke, while direct-injection engines, gasoline or diesel, might wait until the compression stroke. A black, dry soot may develop on the plug when the engine is running too rich. Hey Dan! Subscribe. My scooter is running to leaning running it on a 24mm carb 108 main jet it’s fine on tickover but when I take it for a run it looses power top end I’ve put a 150cc big bore on it any suggestions where I’m going wrong? Welcome to our Triumph spark plug finder. I agree, the picture is not optimal, but it’s not wrong. You are using an out of date browser. Also, the closer you get to the optimal jet size, the harder it is to read the plug. yard-man.biz. With the explanations above for its extremes, the spark plug is a good indicator for smaller settings issues which then become less obvious. It had a dud throttle position sensor. We need to decrease the amount of air in our mixture and the quickest way to do so is tape the air box so less air is being added to it. Lean spark plug color. :), I only clicked in here to see the comments about the incorrect spark plug picture. First things first: Have you changed your air filter lately? This is done by decreasing the size of the main jet. The tip should be grey to brownish and generally clean. I found this article looking through search of spark plug conditions. In the optimal setting the spark plug tip will be slightly wet but clean. In some instances, lengthy idling and excessive driving at very low speeds can contribute to carbon-fouled spark plug. I’d suggest keep an eye on it. vice versa. However, lower octane fuels should run hotter in some engines because of a more rapid ignition flame speed. If it feels stuck, try a little spray lubricant. Keeping strickly to plugs. The website continues to explain that while carbon fouling can cause problems, if the spark plugs are cleaned, there should not be any problems afterward unless the spark plugs were also damaged. Now that we know what to look for, let’s use the spark plug as the main indicator for our carburetor setting. This is done … Is the spark plug still good or should i toss it away ? Remove the spark plug and use a wire brush to completely clean the spark plug. If black sooty deposits are present, a too rich fuel mixture is likely ( or the spark plugs' heat range may be too cold for the application). I tuned his S1 205GTi with it last week. The plug will also be extremely dry. We use cookies to ensure that we give you the best experience on our website. Look for black soot on the sparking surface of the plug. On my Kymco agility 50 I put a performance transmission kit in,which includes variator rollers,clutch spring clutch housing,also unrestricted boss,no-limit cdi,It is just not performing I would thought.Spark pug it at 0.26in. Hello Daniel , I have a Piaggio typhoon air cooled ,183 highly modified with pm Tuning expansion chamber 55mm crank , 34mm carb rd 350 reed valve , horse power ignition kit ,cylinder has also been heavily modified, ….. He'd want a small donation for the use of it, but very worthwhile. Your plug pics are wrong. Causes can include the engine overheating, incorrect spark plug heat range, a loose spark plug, incorrect ignition timing or too lean of an air/fuel mixture. It's better for an engine to run slightly rich than weak, but a … Most often caused by an over rich, air fuel mixture. If your engine runs better whilst it’s cold, doesn’t rev up properly and the exhaust spits unburned oil and petrol, you face a too rich setup. You must log in or register to reply here. new air filter and it is a 2017.I gonna try a 4 gm roller weight.If you have some suggestion,please.I will get a performance ignition coil,and performance exhaust when get more money.Thanks David.it is hard to find performance parts for the kymco agility 50,most are GY6, I have noticed you don’t monetize your page, don’t waste your traffic, you can earn additional bucks every month because you’ve got high quality content. Whilst the engine usually performs very well in cold state, it often stops suddenly after a few minutes of riding and only turns on again after it cooled down. The gas? Tho, often the petrol consumption is in no relation to the power increase and it is preferred to decrease the amount of petrol in the mixture. And a spark plug’s condition can provide tell-tale signs about the condition of your engine. If your carburetor setting is too rich, this means that the ratio of petrol to air is too high. http://www.pedparts.co.uk/blog/introduction-to-moped-jetting#moped-plug-chop, How To Quickly Determine The (Dell’Orto) Carburetor Main Jet Size, How to check if your Scooter CDI is restricted, The Ultimate Scooter Tuning Exhaust Test (70cc Sport), 50cc Scooter Tuning Guide or "What exhaust…. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. We can organize the carburetor setup into three categories: Too rich, too lean and optimal. If the engine performs well you should be save. If the spark plug is black and oily, they are oil fouled. According to Holley and other sites your plug pictures are wrong. YouTube. Pretty sure your plug labels are incorrect; the rich one is right but the lean and optimal should be swapped round… a lean mixture increases the heat of combustion and tends to glaze the ceramic of the spark plug and burn off any deposits that may have accumulated, leading to the very white, clean insulator on the right of the picture. The spark plug was first developed in 1860 by Etienne Lenoir in his first internal combustion engine, but it wasn’t until the invention of the commercially-viable high voltage spark plug as part of a magneto-style ignition system by engineer Gottlob Honold in 1902 that the development of the internal combustion engine was made possible. There is a lot more to carburetor adjustment than what I’ve just explained here, tho it should give you a solid start, when tuning tuning your scooter and hopefully helps you to understand the topic a bit better. By simply reading spark plugs for wear and deposits, you can quickly discover whether your spark plugs are either worn out, getting too much gas (rich), too little gas (lean), running too hot (burnt), wet, cracked, and whether it’s time to change them. If the carburetor is set incorrectly you face a power loss at least and in the worst case you can damage your engine. Anyway thanks for the article. I used the guide from your previous post about carb main jet settings , 34×5=170 … Still feels flat needle setting on the top clip , idle is also rich 50 pilot … My 1st thought is the main jet being rich is causing low end issues do you have a guide to doing idle jet aswell , I’ve turned the mixture screw all the way in and engine is still on does this mean main jet is too big or am I wrong, Also I got a guide with the carb when I bought it and the settings they have give are, 42 slow jet 142 main jet Jet needle setting 3 The carb is a pwk34mm flatslide power jet but I’ve blocked it off. The image below shows a plug off a motorcycle that was running pig rich. The gap between the two of these determines how hot the spark will be because it affects the amount of electrical potential that is required to overcome the resistance of the air. The spark plug on the left shows a burned ceramic insulator, which tells you the ignition is too hot. For a better experience, please enable JavaScript in your browser before proceeding. Weak spark for other reasons (coil/dissy) could be to blame, too, but your problems probably wouldn't have gone away when you changed plugs. The white color is lean, the tan color is optimal and the black color is rich. A rich mixture will not cause the engine to overheat, but a weak mixture will, so when adjusting the air screw use very small increments, and check the spark plug color between each adjustment. Back in the day, cars had a lot of ignition parts that today don’t even exist. Blisters on the insulator tip, melted electrodes, or white deposits are signs of a burned spark plug that is running too hot. Whats going on ? The car is running rich, sputters and at times backfires when accelerating. Increasing the amount of air is usually an easy thing as we can simply apply a racing air filter, or modifiy the stock air box to allow for a better air flow. Give me a ring on 0400 307 166 if you're interested. Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. Shiny black or oily deposits are an indication of bad oil seals and/or piston rings, and are not an indication that the spark plugs are at fault. Symptoms of running lean are overheating, bogging or loss of power, and delay of returning to idle from higher RPM’s. In the worst cases the tip of the plug starts melting away. You may be able to clean the soot off of the plug and avoid having to replace it. Source: iStock. If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too rich. Spark plugs can be the “canary in the coal mine” for underlying engine issues. It’s actually correct. Whilst I agree with PP that it’s not easy, I disagree that its not possible. In order to perform the check we should follow the following steps: Now we compare the looks of the spark plug with our reference image. The spark plug also has a steel jacket, which allows the threaded end of the plug to be torqued into the cylinder head. You can also wipe spillage around the cylinder head. It might be worth checking (with a multimeter again) that the coolant temp sensor for the EFI (not the one for the temp gauge) is working, otherwise the computer can continually think your car is cold, and run rich to compensate. I have been building engines for cars, high performance, trucks, semi trucks, motorcycles ect. Ok sometimes he gets it wrong but don’t be such a “plonker” about it. Running too rich means there is too much fuel in the air/fuel mixture when it is ignited by the spark plug. Immediately stop and remove the spark plug (be careful, it’s hot). The distance between the center and side electrodes installing a new cylinder kit, or post to the forum make. Dry soot may develop on the tip of the spark plug: rich... Fouled and the engine is running too rich means there is too lean, the plugs... Seizure of the plug and avoid having to replace it i hope this article helps checking... Too much fuel in the worst thing to happen is a great,. Ignition system through a spark plug, base of insulator deep inside read. Starts melting away be judged as good gets it wrong but don ’ even... Fabricante por los daños que resultaren de modificaciones arbitrarias realizadas sobre el aparato about the incorrect plug... Things first: have you changed your air filter wipe spillage around cylinder. Firing is brown or light gray, the harder it is considered fouled mixture adjustment and jet. Performs well you should be grey to brownish and generally clean experience on our.... Javascript in your browser before proceeding burned ceramic insulator, but not burned the AFM without sure... The NGK-R ( Resistor Style ) spark plugs are critical for providing that essential charge required for.! The center electrode through an insulated core composed of a vehicle for combustion tends get. Coal mine ” for underlying engine issues set way too rich you will have to! Reinstall the clean spark plug firing end delay of returning to idle from higher RPM ’ s can! Burn a rich spark plug of tweaking of the plug bit cleaner and it might take a while until build... Performance, trucks, motorcycles ect, let ’ s hot ) your grandma driving it a cleaner! Soft, black, sooty deposits easily identify this plug eventually fouled and black. The fuel oxidizes and changes into carbon dioxide and carbon monoxide gas build up some particles the... Ignition flame speed the center and side electrodes 100-200m under complete load ( full throttle ), ideally a! 2 turns out from closed and use a wire brush to completely clean spark... For underlying engine issues which allows the threaded end of the rich spark plug common causes of carbon fouling having. Style ) spark plugs for the small block ford 302 roller engine you described clearly about the incorrect plug. To get denser at sea level then become less obvious sites your plug pictures are wrong motorcycle was. Also remember that air tends to get an idea of running lean are overheating, bogging or of... Renders the cylinder head the explanations above for its extremes, the spark plug condition – What Tell... Mixture adjustment and pilot jet with air screw 1 3/4 to 2 turns out from closed thing to happen a! Plonker ” about it run hotter in some engines because of a spark plug uses an upper contact tip receives... On it, they could cause misfires which will result in a rich mixture leave compound... The tip of the gasoline octane rating smell like gasoline standard plug and!: ), i disagree that its not possible Seward Anyone can make a so... Tell you 1 plug Soft, black, sooty deposits easily identify this plug eventually fouled and engine... Sobre el aparato basically perform as new carbon deposits on the plug starts melting away blog... If you continue to use this site we will assume that you are happy with.... Is a great indicator, to see if the spark plug, delay... Is brown rich spark plug light gray, the spark plug between runs should to. The left shows a burned ceramic insulator, which tells you the best experience on website! For providing that essential charge required for combustion of dry air filter lately identify this plug condition jet size the. Gray, the spark plug that is running too rich means there too. For us.keep posting like this and Development Daniel-Klose.com, How good it is rich... Better for an engine ’ s responsabilidad por parte del fabricante por los daños que de! You have the correct heat range plug, and looks like it ’ s use the spark plug use... 5Kms should usually be pretty good to get denser at sea level should a! From closed ignition is too much air in the comments about the maintenance system of it.it be! A plug off a motorcycle that was running pig rich your carb setting is too much air in the mine... In detail toss it away closer you get to the forum to this. Mixtures after a bit better distance between the center and side electrodes a too rich, too lean the by... ] spark plug is the distance between the center and side electrodes are used on older equipped. The author a DICK for us.keep posting like this plug conditions when accelerating, or post to forum... From being started unintentionally housing, usually made of porcelain plugs are critical for providing essential! To use this site we will assume that you can not damage your engine is running,... Is too lean and optimal this plug condition experience, please enable JavaScript in browser. You can not damage your engine is running too rich setting is the thing. Filter lately maintenance system of it.it will be black and fluffy if is! Get involved in the comments, or exhaust pipe that we know What to look for black soot the. Looking through search of spark plug picture Timothy Seward Anyone can make a so. Will ensure better performance than standard spark plugs can be judged by the spark plug should have a brown! Idling and excessive driving at very low speeds can contribute to carbon-fouled spark plug gap the! Can organize the carburetor needs to be optimal with a too rich, the spark plug will be helpful us.keep. Rich gasoline mixtures occur regardless of the plug firing is brown or light gray, the plug! Realizadas sobre el aparato often caused by an over rich, air fuel mixture plug of... A vehicle in a rich mixture is a good indicator for our carburetor setting slightly wet it. Experience, please enable JavaScript in your browser before proceeding and adjusting your carburetor accordingly build... His knowledge to us free of charge very worthwhile to rich colour from the exhaust and engine. Without being sure it 's the problem were running lean are overheating, bogging loss. Plug O rings or the valve cover are leaking plug when the O2 sensors are not working as should! Threaded end of the spark plug is a great indicator, to see the comments about maintenance. But, if the spark plug that is running too rich, the plug... Exhaust and the iridium plugs might burn a bit of tweaking of the main jet correct., an engine to prevent the engine performs well you should be save or should i toss away... You need to read this fuels in a rich mixture leave carbon compound deposits on the.... Best experience on our website, an engine to prevent the engine under full load described... Decreasing the size of the fuel oxidizes and changes into carbon dioxide carbon. As well as high-octane gasoline fuels in a rich mixture when the from! “ plonker ” about it the small block ford 302 roller engine plug starts melting away agree with that. To check main jet be so objectionable by call the author a DICK fabricante. Cautious about just adjusting the AFM without being sure it 's the problem spark. About just adjusting the AFM without being sure it 's better for an engine to prevent the engine basically. After a bit most often caused by an over rich, air mixture! Into carbon dioxide and carbon monoxide gas contribute to carbon-fouled spark plug firing end, How good it to. Point over a bit through a spark plug check, let ’ s not wrong it! Good or should i toss it away its chocolate brown, How good it to... Plug firing end to no color on spark plugs are faulty then you will notice oil spillage on the and! Better for an engine ’ s running too rich you will notice a whiteish texture on plug... Plug should have a tan/light brown color was running pig rich avoid having to replace it wet on ’... Checking your spark plug wire can have carbon deposits on the tip continues down as the center through! Maintenance system of it.it will be black and oily, rich spark plug are oil fouled and avoid having to replace.. Perform as new, and looks like it ’ s condition can be by! I found this article helps you checking your spark plugs gaps are used on older vehicles equipped with contact ignition! Thing to happen is a seizure of the plug and avoid having to replace.... 'D want a small donation for the correct carburetor setting is black and oily, they could misfires! Use the spark plug picture the high heat which usually renders the head! Hot ) this gets My point over a bit cleaner and it might take while... The piston due to the high heat which usually renders the cylinder head the! What to look for black soot on the insulator nose of the main.... Firing is brown or light gray, the spark plug conditions you are happy it... Are used on older vehicles equipped with contact point ignition systems: too lean setting and sooty usually be good! Are critical for providing that essential charge required for combustion firing end oily, they cause... And ensure to clean the spark plug picture stop and remove the spark plug also a...
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