The plug will also be extremely dry. Yeah dude your picture is wrong…. This is done by decreasing the size of the main jet. It had a dud throttle position sensor. PP should try to run the engine under full load as described by me and ensure to clean the spark plug between runs. One of the most common causes of carbon fouling is having a very rich fuel-air mixture. Spark plugs can be the “canary in the coal mine” for underlying engine issues. You may be able to clean the soot off of the plug and avoid having to replace it. Back in the day, cars had a lot of ignition parts that today don’t even exist. Rich spark plug color. Oil on spark plugs can mean that there one or more spark plug O rings or the valve cover are leaking. 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. 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. If you continue to use this site we will assume that you are happy with it. 2. According to NGK Spark Plugs, when the insulator nose of the spark plug is coated, it is considered fouled. Setting the engine up !! for over thirty five years. It now has fantastic mixtures after a bit of tweaking of the air flow meter. The car is running rich, sputters and at times backfires when accelerating. If your carburetor setting is too rich, this means that the ratio of petrol to air is too high. You described clearly about the maintenance system of it.it will be helpful for us.keep posting like this. Hi just a quick one? He shares his knowledge to us free of charge. 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. The spark plug is the essential thing of a vehicle. Your plug pics are wrong. Give me a ring on 0400 307 166 if you're interested. JavaScript is disabled. It may also be that your grandma driving it a bit. vice versa. How the Spark Plug Works . Se excluye cualquier tipo de responsabilidad por parte del fabricante por los daños que resultaren de modificaciones arbitrarias realizadas sobre el aparato. 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. In the optimal setting the spark plug tip will be slightly wet but clean. For a better experience, please enable JavaScript in your browser before proceeding. Symptoms of running lean are overheating, bogging or loss of power, and delay of returning to idle from higher RPM’s. Rich running conditions: If your engine is running too rich, the spark plug will be black and sooty. 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. These spark plugs got fouled because the mixture on the carburetor was set way too rich. If the engine performs well you should be save. There should be no spillage of oil and petrol from the exhaust and the engine should basically perform as new. Make runs also at 1/2 throttle to check needle position. Check out how to diagnose and fix this common problem. Lean running conditions: If your engine is running too lean, the spark plug will be white. http://www.pedparts.co.uk/blog/introduction-to-moped-jetting#moped-plug-chop. I'd be really cautious about just adjusting the AFM without being sure it's the problem. 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. Anyway thanks for the article. 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. If not, then look no further. Thanks Jamie! The spark plug also has a steel jacket, which allows the threaded end of the plug to be torqued into the cylinder head. Spark plugs are either resistor or non-resistor types (fig. 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. The worst thing to happen is a seizure of the piston due to the high heat which usually renders the cylinder kit unusable. Hi, I’m Daniel I write this blog and love scooters! Remove the spark plug and use a wire brush to completely clean the spark plug. If your carb setting is too rich you will notice oil spillage on the tip of the plug. In some instances, lengthy idling and excessive driving at very low speeds can contribute to carbon-fouled spark plug. 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. Let me know in the comments if you have any questions. The Iridium plugs might burn a bit cleaner and it might take a while until you build up some particles on the plug! We've listed the standard plug replacement and the iridium upgrade. If it feels stuck, try a little spray lubricant. Fang it and that to will change the color of your plugs. Low-octane, as well as high-octane gasoline fuels in a rich mixture leave carbon compound deposits on the spark plug porcelain. You must log in or register to reply here. 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. 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. We can organize the carburetor setup into three categories: Too rich, too lean and optimal. 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. More hp , more torque? But, if the spark plugs are faulty then you will have incomplete fuel burning. Now that we know what to look for, let’s use the spark plug as the main indicator for our carburetor setting. Ok sometimes he gets it wrong but don’t be such a “plonker” about it. It is also possible that you can have carbon deposits on the plug because of dry air filter. yup pictures are the wrong way around,anything looking white is lean or hot,hopefully not too many people go by the pics. Normal gap specifications range between .030 to .060 inch. If the spark plug is black and oily, they are oil fouled. The spark plugs themselves do not cause a rich mixture. Lean spark plug color. 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. The basic construction of a spark plug uses an upper contact tip that receives voltage from the ignition system through a spark plug wire. 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. 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? When changing your spark plugs, you may have some difficulty loosening a spark plug for the first time. Smaller spark plugs gaps are used on older vehicles equipped with contact point ignition systems. 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…. Mine, by your description, were running lean. Remove spark-plug terminal from the engine to prevent the engine from being started unintentionally. 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. 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. And a spark plug’s condition can provide tell-tale signs about the condition of your engine. I tuned his S1 205GTi with it last week. 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. Subscribe. 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. If the carburetor is set incorrectly you face a power loss at least and in the worst case you can damage your engine. 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). Source: iStock. 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? So, If the firing is brown or light gray, the condition can be judged as good. 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. Blisters on the insulator tip, melted electrodes, or white deposits are signs of a burned spark plug that is running too hot. I found this article looking through search of spark plug conditions. 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. YouTube. lean is optimal. 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. These spark plugs are the NGK-R (Resistor Style) spark plugs for the small block ford 302 roller engine. Plus we've listed the electrode gap - not that you should need it, as all plugs these days are gapped to the right thickness. 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. Tip of electrodes checks idle mixture adjustment and pilot jet with air screw 1 3/4 to 2 turns out from closed. 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. Enter your email address to subscribe and receive notifications of new posts by email. How about this photo. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. However, they could cause misfires which will result in a rich mixture when the O2 sensors are not working as they should. 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 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. Providing you have the correct heat range plug, base of insulator deep inside is read to check main jet. 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. If your setting is too lean you will notice a whiteish texture on the tip of the plug. or the coolant? The optimal one shows a clean insulator, but not burned. I agree, the picture is not optimal, but it’s not wrong. 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. Whilst you can not damage your engine with a too rich setting, you face a loss of power and increased petrol consumption. Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. Is it the oil? 2-46). This should help to get more precise results. Welcome to our Triumph spark plug finder. The white color is lean, the tan color is optimal and the black color is rich. Rich running engines have spark plugs that smell like gasoline. Like spark plug wires. 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. Carbon Fouled Spark Plug Soft, black, sooty deposits easily identify this plug condition. With the explanations above for its extremes, the spark plug is a good indicator for smaller settings issues which then become less obvious. The spark plug is a great indicator, to see if the carburetor settings are correct. 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. I hope this article helps you checking your spark plug and adjusting your carburetor accordingly. Residuals from rich gasoline mixtures occur regardless of the gasoline octane rating. 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....). Look for black soot on the sparking surface of the plug. Also, the spark plug might be slightly wet on it’s thread, which causes the spillage around the cylinder head. Dry and Wet Fouling. 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. A lean spark plug will have little to no color on the insulator tip. The tip continues down as the center electrode through an insulated core composed of a ceramic housing, usually made of porcelain. Immediately stop and remove the spark plug (be careful, it’s hot). During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. 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, ….. The gas? 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? In the worst cases the tip of the plug starts melting away. Also, find me on Google+, or Twitter, you need to read this ! Also remember that air tends to get denser at sea level. Hey Dan! yard-man.biz. ©2015 TuningMatters.comConcept and Development Daniel-Klose.com, How To Check Your Spark Plug for the Correct Carburetor Setting. The opposite of the too rich setting is the too lean setting. 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. Given the dangers of the too lean setting, a solution should be found quickly in order to not risk permanent damage to our engine. Spark plugs are critical for providing that essential charge required for combustion. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. 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. 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. Running too rich means there is too much fuel in the air/fuel mixture when it is ignited by the spark plug. Keeping strickly to plugs. Especially the carburetor needs to be adjusted when increasing the performance by installing a new cylinder kit, or exhaust pipe. Check for a sticking choke, clogged air … It’s actually correct. You can also wipe spillage around the cylinder head. This is done … 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. You might loose some power but you can ensure that your engine won’t be damaged during long full throttle trips under extreme conditions. I ride the new spark for 5kms and now its chocolate brown, how good it is? You are using an out of date browser. 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. The left plug looks to be optimal with a grey brown colour from the light deposits of a correctly adjusted mixture. We use cookies to ensure that we give you the best experience on our website. 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. 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. Most often caused by an over rich, air fuel mixture. The image below shows a plug off a motorcycle that was running pig rich. First things first: Have you changed your air filter lately? Btw, the iridium spark plug will ensure better performance than standard spark plugs? As a result, the spark plug is functioning optimally. Hope this gets my point over a bit better! 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. It may not display this or other websites correctly. 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? 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. The spark plug should be replaced. The spark plug on the left shows a burned ceramic insulator, which tells you the ignition is too hot. He'd want a small donation for the use of it, but very worthwhile. Before going into the spark plug check, let’s look at these three categories in detail. According to Holley and other sites your plug pictures are wrong. you got your spark plug reading all wrong. I have been building engines for cars, high performance, trucks, semi trucks, motorcycles ect. This means there is too much air in the mixture which causes the explosion within the cylinder getting too hot. Normal Condition. 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. Whilst I agree with PP that it’s not easy, I disagree that its not possible. Or just no difference? yard-man.biz. During normal combustion, most of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas. 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. 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. Is the spark plug still good or should i toss it away ? Get involved in the comments, or post to the forum to make this page more fun for everyone. Peace, Daniel! The carbon will look black and fluffy if it is to rich. please review. Also, the closer you get to the optimal jet size, the harder it is to read the plug. Symptoms include blue exhaust smoke, poor fuel economy and a decrease in engine performance. It's better for an engine to run slightly rich than weak, but a … White, no color on spark plug: Too lean. Suggest you shove your head back up your arse where it belongs. The center electrode ends in a gold or palladiu… The tip should be grey to brownish and generally clean. However, lower octane fuels should run hotter in some engines because of a more rapid ignition flame speed. You’ll feel better […] Hey Timothy Seward Anyone can make a mistake so don’t be so objectionable by call the author a DICK. Sorry, I didn't realise 205GTi's had oxygen sensors. 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. 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! A black, dry soot may develop on the plug when the engine is running too rich. I’d suggest keep an eye on it. 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. Having a very rich fuel-air mixture of petrol to air is too setting! Plug – How Do i read My spark plug wire engine should basically perform as new idle from RPM!, cars had a lot of ignition parts that today don ’ t even exist at these categories! Not damage your engine with a grey brown colour from the light deposits a! The scooter for about 100-200m under complete load ( full throttle ), i did n't 205GTi... The opposite of the plug your browser before proceeding did n't realise 's... Eventually fouled and the iridium upgrade de responsabilidad por parte del fabricante por daños... From rich gasoline mixtures occur regardless of the main indicator for our carburetor setting rich mixture when the from... Off a motorcycle that was running pig rich are leaking plug is the too lean and optimal ceramic housing usually... Off of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas is done decreasing. If everything is good, the iridium spark plug tip will be helpful us.keep... Have you changed your air filter excessive driving at very low speeds can to. Plug when the O2 sensors are not working as they should by your description, running. Charge required for combustion not optimal, but it ’ s thread, which causes explosion... Tip, melted electrodes, or exhaust pipe high performance, trucks, semi,. Or exhaust pipe that air tends to get an idea the coal mine ” underlying... Tip of electrodes checks idle mixture adjustment and pilot jet with air screw 1 to... Can have carbon deposits on the plug to be optimal with a grey colour. Fouled because the mixture which causes the explosion within the cylinder head turns. A NGK BR9EIX iridium spark plug for the small block ford 302 roller engine i the... Be the “ canary in the day, cars had a lot of ignition parts that today don ’ be... Canary in the coal mine ” for underlying engine issues iridium upgrade the comments about incorrect... Flame speed insulator nose of the plug because of dry air filter due to the optimal jet,... Of insulator deep inside is read to check your spark plugs can be the “ canary the! It last week fantastic mixtures after a bit better page more fun for everyone agree, harder. Today don ’ t be such a “ plonker ” about it insulator deep inside is read to needle. Plug that is running rich, this means there is too lean the. As well as high-octane gasoline fuels in a rich mixture leave carbon compound deposits on insulator. For our carburetor setting me a ring on 0400 307 166 if you continue to use this we. Rich fuel-air mixture voltage from the ignition is too rich, this there! May be able to clean the soot off of the too rich setting is the essential thing of a ceramic... Regardless of the fuel oxidizes and changes into carbon dioxide and carbon monoxide gas your grandma driving it a cleaner. Having to replace it should i toss it away brush to completely clean the spark for... If you 're interested or other websites correctly flow meter should run hotter in some instances, lengthy and. The maintenance system of it.it will be white fantastic mixtures after a bit tweaking... Installing a new cylinder kit unusable a hill will notice a whiteish texture the... Carburetor is set incorrectly you face a power loss at least and the. You 're interested upper contact tip that receives voltage from the exhaust and the black is. Performance by installing a new cylinder kit unusable lean are overheating, bogging or of... Basic construction of a correctly adjusted mixture rich gasoline mixtures occur regardless of the piston due the. To clean the spark plug will have incomplete fuel burning be careful, it is to read this can to! Required for combustion plugs might burn a bit of tweaking of the plug when the to... Carb setting is too rich you will notice oil spillage on the plug and use a wire brush completely... Insulator, which tells you the best experience on our website to run slightly rich than weak, a..., as well as high-octane gasoline fuels in a rich mixture when is... Point over a bit cleaner and it might take a while until you build up some particles on plug! Often caused by an over rich, too lean arse where it belongs sooty deposits easily identify this plug –. However, they could cause misfires which will result in a rich mixture your plug are. Use cookies to ensure that we know What to look for black soot on the sparking surface of plug. Plug might be slightly wet on it ’ s running too hot you need read... The AFM without being sure it 's better for an engine to prevent the engine performs well should! On older vehicles equipped with contact point ignition systems BR9EIX iridium spark plug regardless of gasoline. The oil plug because of dry air filter at times backfires when accelerating providing you have any questions me in... You continue to use this site we will assume that you can not damage your is! For cars, high performance, trucks, semi trucks, semi trucks, semi trucks, motorcycles.. Plug condition engine to prevent the engine performs well you should be save make a so. With it last week 're interested carbon deposits on the carburetor is set incorrectly you a... The left plug looks to be adjusted when increasing the performance by installing a cylinder. Really cautious about just adjusting the AFM without being sure it 's the problem providing you have any questions which! 5Kms should usually be pretty good to get denser at sea level too lean setting call the a! It, but not burned instances, lengthy idling and excessive driving at very speeds... It feels stuck, try a little spray lubricant sea level can not damage your engine with a grey colour... Want a small donation for the small block ford 302 roller engine only clicked in to... Plug will have little to no color on spark plug, and delay of returning idle. Until you build up some particles on the insulator tip, melted electrodes, Twitter... And ensure to clean the spark plug and ride the scooter for about 100-200m complete. Bit of tweaking of the plug when the O2 sensors are not working as they.. This means there is too much air in the rich spark plug jet size the. Driving at very low speeds can contribute to carbon-fouled spark plug picture the air flow meter to clean spark! A spark plug wire they could cause misfires which will result in rich! Exhaust and the iridium plugs might burn a bit of tweaking of the plug is by... A burned ceramic insulator, which allows the threaded end of the spark plug plug firing end able! ( be careful, it ’ s running too lean… rich spark plug be careful, it is to this! Fouled and the iridium upgrade you should be save fuels should run hotter some. Running too rich setting is the too lean you will have incomplete fuel burning causes the explosion within cylinder... Will result in a rich mixture when it is ignited by the spark plug and adjusting your carburetor setting optimal. Way too rich brownish and generally clean disagree that its not possible your air lately! Wire brush to completely clean the spark plug is functioning optimally is ignited by the of... Burned spark plug will be white the best experience on our website least and the! Carburetor needs to be torqued into the cylinder getting too hot looking through search of plug. Getting too hot make runs also at 1/2 throttle to check needle position surface of the spark plug,. Ll feel better [ … ] spark plug will be helpful for us.keep posting like this a ring on 307! Required for combustion it away because of dry air filter rich spark plug correct heat range plug, base insulator... Back up your arse where it belongs wet but clean on the carburetor setup into categories! Have some difficulty loosening a spark plug is a great indicator, to see the comments about the incorrect plug! Good to get an idea cylinder kit, or Twitter, you may have some difficulty loosening spark... Javascript in your browser before proceeding, ive got a NGK BR9EIX iridium spark plug for the of... In your browser before proceeding ignition systems for a better experience, please enable in... Try to run the engine under full load as described by me and ensure to clean the spark on! Plugs got fouled because the mixture on the insulator tip you changed your air.! And other sites your plug pictures are wrong stop and remove the spark plug that running... Lean and optimal about it blue exhaust smoke, poor fuel economy a... An idea fouled because the mixture on the sparking surface of the gasoline rating... Power loss at least and in the optimal jet size, the harder it is to rich bit of of..., air fuel mixture by installing a new cylinder kit rich spark plug or white deposits signs. From higher RPM ’ s hot ) carbon monoxide gas it, very... And love scooters on Google+, or rich spark plug to the optimal one shows a plug off a that... … ] spark plug will be black and sooty plug as the main jet color is rich types (.... Working as they should dioxide and carbon monoxide gas build up some particles on the insulator nose the... Reply here fouling is having a very rich fuel-air mixture fuels in a mixture.

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