Moderate. Richen it up more will probably start fowling plugs and gumming up the top end, power valve and exhaust system with unburned oil. If your plug is grey or white, than you know that your engine is running too lean and you need to take steps to prevent engine damage. Seems like the plugs last quite awhile these days. You can use feeler gauges to set the perfect plug gap. 1 users rated this 5 out of 5 stars 1. When I got a new pipe for my two stroke Kawi, I leaned the jets out a tiny bit. Install the plug and run the bike for a few minutes. If you want to tune for max. Step 2. Rich spark plug color. If so, install the fresh plug, and operate the bike normally for a few minutes, remove the new plug and "read" it. 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. Fun Fact: One stroke is half a revolution thus the term 4-stroke. This current season I've switched over to another so called 'snowmobile' premix/injector oil:  Shell Advance Snow Ultra. The shell will always appear a but more shiny, as an indication of the higher cylinder temps. Running the needle length to rich will make it run weak and blubber in the midrange. My last two stroke, ‘91 yz125, 25 years ago!! You may also need to change to a larger carburetor jet. 1. This was all the rage in the late 1960s and early to mid 1970s. I think I’ll pop a new one in and check it frequently. 0 users rated this 2 out of 5 stars 0. Dominator has the same base oil just a little different additive pack. I should have checked the plug tho. Need this gearing for the slower spots. Some simple but critical aspects to consider is a lack of compression can mimic lean running. I still do of course, just don’t seem to need it near as often. Lean Spark plug? Ratings and reviews. for 11,000 max RPM use Yamalube at 32:1 (no I am not repeating what others have said. Rode hard with it yesterday in the 300 tho. Best 2-stroke spark plug. Pretty much in a lean condition your spark plug becomes glowing red hot, removing the need for an electrical spark. Operating your bike a little too rich won't hurt it - but too lean is never good. Article Source: 0 users rated this 4 out of 5 stars 0. simply because of easier local availability and price than mail ordering Amsoil by the 12 qt. A hotter plug in not recommended - make sure your fuel mix is correct, and consider a smaller jet only if the bike stumbles or sounds "full of snot" and doesn't run crisp. White means main jet is … By carsonxt, September 1 in Kawasaki 2 Stroke. You need to be a member in order to leave a comment. The information contained in this guide applies to all types of internal … The spark plug on a 2-stroke can tell you a lot about how the bike is running. I’m new to that though. White is lean and black is rich. Prev; 1; 2; 3; Next; Page 2 of 3 . Buy Now Free Shipping - VICTA SPARK PLUG LEAD FOR TWO STROKE LAWN MOWER MOTORS AFTERMARKET - Australia Largest Online Parts Retailer Ideally, the electrode looks brown. I’ve looked around to try and diagnose my plug, but had no luck with finding one that looked similar. You want a full turn of light soot color on the base ring!!! Copyright© ThumperTalk, Inc. - All rights reserved. The biggest problem with running the needle length too lean is welding your piston to your cylinder or, burning a hole in your piston. Back in the days of Yore, This was quite common. While it was initially marketed as snowmobile oil for it's virtues in keeping the powervalves clean, Interceptor is an 'all-sports' premix/injector oil aimed at the recreational market (dirt bikes, snowmobiles etc. My 66 Triumph 100cc 2 stroke scooter at 1600 mls on the clock will only run on a new plug for maybe 50 miles before it starts to run rough at idle and becomes hard to start. The plug gap between the center electrode and the ground electrode should be according to the manufacturer's specifications. My bike runs beautifully with no issues but I am now worried about running too lean.. the plug shows it’s rich but I’ll try throwing in some richer jets and see if it runs any better or worse. item 3 Victa 2 stroke lawn mower spark plug suits 1970 onwards - Victa 2 stroke lawn mower spark plug suits 1970 onwards. |   Thinking If You Should Buy an Electric Scooter? That plug could be black from a rich needle clip position and may be lean enough to melt down on the main jet. Last winter I split the cases to fix a gearbox issue I went ahead and preventatively refurbished the crank/rod and had the cylinder replated. Mikethetileguy Mikethetileguy TT Member; Members; 76 posts ; Location: USA; Posted September 3. everything could have easily gone another season yet I still went ahead with a full refurb since the engine was torn apart. Basically you forget about it! Next minute at a sand track or a massive pull up a hill climb they lean seize their bike because they're suddenly riding on their undersized main jet. Runs better at higher altitudes - AFR becomes normalized due to reduced atmospheric pressure allowing fuel into the venturi easier. The only way to stop the bike is to pull the choke and cut off the oxygen supply. Check your fuel mixture to see if you are mixing the oil and fuel in the correct proportions (50 parts fuel to 1 part oil). that plug is soaked with oil, the bike is not running lean. The Kawasaki’s come rich from the showroom so with a new pipe I thought might as well lean it out. outboard are ideal for what I do. For a two-stroke engine, having a fresh spark plug is incredibly important. https://EzineArticles.com/expert/Gerry_Korsten/46348, Automotive: Motorcycles If the sparks that result are blue, then you know you have a fully functioning plug. We Modified existing Compression Releases too. Checking your compression is a mandatory starting point on any 2 stroke that you are either trying to diagnose or improve the performance of. Spark plug construction. Lean. 42, the stock was 45. This problem can be caused by too much oil in the fuel and oil mixture and/or having a faulty spark plug that is misfiring. Typically people panic and don't know what to do, usually reaching for their spark plug boot or shutting down the bike. elma . Use a fresh plug and ground the electrode to the engine while pulling the starter - the spark should be a healthy blue. The top of a new spark plug is covered in white ceramic insulation. It's possible to be pig rich on the needle and lean on the main. You should check your oil and fuel mixture. We will never sell or rent your email address. I agree, the motor will die at idle if too lean. Insulator may be white. This will do nothing to stop engine runaway. 4. A lean spark plug will have little to no color on the insulator tip. 3 Articles, By Now it idles until I kill it and runs great under full throttle! 2-Stroke Carburetor Main Jet Why Proper Carb Tuning Is Critical For 2-Stroke Engines. There Are Two Types of Motorcycle Riders! Lean running causes detonation and extra heat, the leaner mixture cannot carry that heat away, and the motor destructs. Wide open throttle yields no power. If the bike's engine stumbles, sounds clogged up or doesn't run clear than you might want to get a smaller carburetor jet. carsonxt, September 1, 2019 in Kawasaki 2 Stroke. For use in competition, the NGK B7HS-10 short thread plugs and the NGK BR9EIX long thread plugs are recommended. Ours also showed no signs of problems. For standard use, the NGK B7HS short thread plugs and B9ES long thread plugs are recommended. In fact it may feel like riding a small bore two stroke, simply no power down low, then as it finally revs up, whoah baby! Recommended Posts. There are many factors that can cause an oil and fuel mixture that worked great to become less than ideal. I have a 2000 ktm 2 stroke dirtbike that keeps fouling plugs with oil, every ride i have to switch the plug for a clean one and itll work perfect for a bit and then bog out on me, sometimes it lasts a couple hours sometimes it lasts 5 minutes. Free postage. If you want to stick to 50:1 then use Maxima Castor 927 or K-2. What riding style would you say your son has? Expert AU $6.25. But an $8 plug is cheaper than any motor part! It's also the litmus paper for reading timing and fuel mixture. Now after 20 or so engine hours I've noticed that despite having a slightly higher flash point than Interceptor, the Shell oil burns even cleaner with less dripping from the powervalve vent tube, even when premixed at 30:1. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. KCvale Well-Known Member. Heavier oil will do any good but a higher oil to gas ratio will. Near the end of the compression stroke, the layers collapse into uniform minute turbulences, which effectively promote lean-burn characteristics. Fitting a new plug will resolve all problems. Spark plugs are clean - No residue. Overheating, 4-Stroke If a spark plug from a 4-stroke engine has a gray or white blistered appearance or burned electrodes, the engine may be overheating. Improper 2-stroke carburetor tuning will have a much more significant effect on a 2-stroke engine than a 4-stroke because the premixed oil lubricates the crankshaft. Wide open abt 40% of the time. 5. While you should regularly inspect your spark plug, it is essential to check your plug after any type of engine modification to make sure the engine isn't running too lean. Difficulty Starting. The electrode turns white when you run too lean (more air to fuel) or turns black and oily when running too rich (more fuel to air). The spark plug often fails because of neglect. Go. I read on other forums to lean out when you get a new two stroke pipe. The Best Electric Scooters and Hoverboards - Is the World Finally Ready to Accept Them? I adjusted pilot and needle per PC but richened main from 138 to 142. Gerry Korsten. Spark plugs are one of the most misunderstood components of an engine. This is the ratio my ratio calculator says is right for that rpm on a water cooled engine) www.dragonfly75.com/moto/oil.html. To begin with we removed the spark plug from the engine. Write a review. I'm pretty sure Interceptor is for weed wackers and Dominator is for motorcycles (use at 28:1). Lean spark plug color. ), whereas Dominator is marketed as a 'racing' oil with a lesser amount of additives (better cold weather pour/flow, cleaning, anti-rust etc. I left the clip on 3. Overheating, 2-Stroke The appearance will be the same as an overheated 4-stroke plug. A little dirt in your carb could cause it to run lean, and you wouldn't even know why your bike was running so nice and crisp until it seized. crate. No significant wear observed, of course the crank bearings weren't as tight and smooth as new ones, no play in the rod either. My current plug looks good, however it’s seen different jets and the spark arrestor during it’s life. So you should look for loose intake manifold bolts, leaks in the carburetor mounting, faulty gaskets and leaks in the crank seals. 2 hours ago, shrubitup said: 42, the stock was 45. No issues using amsoil Interceptor 50:1. Reduced Power - Sluggish at certain RPM's. The spark plug on your ATV not only starts the engine but keeps it running by maintaining a continuous spark firing once per full revolution on a 2-stroke and every other full revolution on a 4-stroke. Same here. It's possible to be pig rich on the needle and lean on the main. Due to the dirt, the spark plug will not work properly and will make sputtering noises due to mis–firing. This is normal enough, however, if your 2-stroke plug is caked in spark plug then it's time to retune your carburetor jetting for the current conditions. To do so, touch the electrode end of the plug to the engine while pulling the starter. By "reading" the color of the plug you can tell a lot of things about how the engine is running. I run it on the highest octane fuel available at the pump at a 40/1 mix. First, clean your fuel system, looking for any blockage. The image below shows a plug off a motorcycle that was running pig rich. Free Member. Would have likely shown lean as it was white when I pulled the blown motor. I adjusted pilot and needle per PC but richened main from 138 to 142. Symptoms of running lean are overheating, bogging or loss of power, and delay of returning to idle from higher RPM’s. If your engine is running perfectly, then this part of the plug would soon become a tan color. A lot of people don't ride on the main as much as they think they do. Feb 28, 2010 3,967 53 48 Phoenix,AZ. please help. 2. Jetting is too lean; Fouled spark plug; Spark plug is loose; Spark plug cap is loose/broken; Air filter is dirty; Throttle opened too quickly; CDI box is bad; Stator is bad; Electrical wiring short/broken wire ; Timing is off; Not Getting Enough Fuel. Then stop the bike, remove the spark plug and look at it. They see the rich plug and lean out the main jet when really they should be leaning the needle. (2) Make sure that the spark plug lead wire is solidly connected to the spark plug cap. © 2020 EzineArticlesAll Rights Reserved Worldwide. What riding style would you say your son has? The compression release can be used for something else on two stroke engines... an engine brake. If your spark plug is black or oily than that means the engine is running too rich and is not properly combusting fuel. Run a richer main. If you suspect the spark plug cap, pull the lead wire out of the cap and look at the end of the wire. So you should check your plug often. You can put a compression release in the extra hole. Submitted On March 31, 2006. Maybe do a chop test. There also are 18mm plugs, seen only rarely in motorcycle applications despite the advantage they bring to two-stroke engines. ), My YZ125 went over 100 hours problem free with Interceptor at 32:1 (recreational MX'ing but still hitting max revs at least once a lap). The plug burns a dry brown and doesn't have significant deposits. 2-Stroke Engines – basically these engines’ plugs read very similarly to the 4-stroke engine as far as the insulator and electrodes are concerned. For most 2-stroke motocross bikes, a good ratio is 32:1. A peak at the piston up the exhaust port shows absolutely no wear. 0 users rated this 3 out of 5 stars 0. The engine may bog down until you reach a lower RPM and then suddenly power returns. The brand of the gas and the oil as well as air density can affect how well the mixture works. interceptor is primarily for snowmobiles. 1; 2; Next. Some 1960s and 70s two stroke engine heads have two spark plug holes. If it still appears blackened or oily, the problem lies elsewhere. Is there a difference between a spark plug for a 2 stroke engine and a 4 stroke. See all 10 photos Anatomy of a spark plug: 1) The ceramic insulator's properties affect the heat range of the plug. Run it a WOT like way2slow mentioned and check the way he stated The pull-start must then be pulled; whilst doing so observe to see if sparks occur. Amsoil Sabre is for small equipment pre mix. Saber is for lawn equipment. The Kawasaki’s come rich from the showroom so with a new pipe I thought might as well lean it out. associated with 2-cycle engines. Remove the spark plug and examine the INSULATOR (the porcelain) color. Gerry Korsten  |   even considering I tend to jet a bit on the lean & mean side and now push my little 125 harder than previous seasons. Dirt in your carb can cause the bike to run lean. Author With this current setup the bike starts great, idles great, rips, sounds great, and reduced spooge to a couple drips from the hose when put away after riding. The plug in your 2-stroke will look darker than the plugs your 4-stroke car; 2-strokes burn oil in the gas which will give a darker appetence. That said, no interceptor is coming near my mini again. Hence spark plug is a very vital component of an engine. High Performance Bicycle Engine Tips and Motorized . I should have checked the plug tho. 1 product rating. This plug eventually fouled and the bike would not start. Jetting: Jetting = the air/fuel mixture ratio shows up on the base ring (the last thread ring, it has the strap welded to it). With this current setup the bike starts great, idles great, rips, sounds great, and reduced spooge to a couple drips from the hose when put away after riding . Copyright© ThumperTalk, Inc. - All rights reserved.ThumperTalk® is a registered trademark. yes the motor will survive, I've been a mechanic for nearly 40 years now. Ride slower trails but he’s using 12/54 gearing which results in heavier throttle use than stock gearing. I always had a spare on hand. But overall I worked on this motor for almost a month from the broken air/fuel screw and idling issue to the burning plugs and killing at full throttle. When I got a new pipe for my two stroke Kawi, I leaned the jets out a tiny bit. More for the racer constantly hitting and hanging in the high rpms. The top of a new spark plug is covered in white ceramic insulation. More importantly, ignition occurs in the initial stages of breakdown of the separate layers while substantial amounts of each layer still exist. Different Style Of Cafe Racer Helmets Through The Years, 5 Factors That May/Will Influence the Decision Making of the Royal Enfield and Jawa Buyers. BUT, you have me wanting to set the main back to stock!! Believe it or not, on a 2 stroke, the mixture also contributes to cooling the piston. First, you should figure out if the spark plug is the problem. The lean condition can also be caused by fresh air entering the engine somewhere it shouldn't. By "reading" the color of the plug you can tell a lot of things about how the engine is running. This is when the dreaded “bog” happens. Best color is a tan to grayish-white. Dominator is designed for WOT. For a two-stroke engine, having a fresh spark plug is incredibly important. To test the plug we connect the lead and ground the spark plug by placing its body against the engine or mower deck. Gerry runs the website PocketBike Info [http://www.pocketbikeinfo.org] which is a collection of various articles on Pocketbikes [http://www.pocketbikeinfo.org]. Thread starter KCvale; Start date Jul 3, 2013; Forums. It's alot easier to tell if your 2 stroke is running rich or lean than a 4 stroke. But, at idle, you never really generate enough heat for this to be a problem. Numerous questions have surfaced over the years, leaving many people confused. If the engine is starving for fuel, it doesn’t have anything to ignite and produce power. I read on other forums to lean out when you get a new two stroke pipe, http://www.nightrider.com/bt30/carb_jet_ranges.htm. 3. If the rider isn't riding hard enough, often enough, then you can foul a plug even with a lean main jet. Next Last. Gas is 32 times more than the amount of oil. 1 of 2 Go to page. 5.0. So you should check your plug often. Causes include plugged cooling fins, bent or damaged blower housing, missing shields, carburetor set too lean or spark plug improperly tightened. Anything is possible regarding jetting but speaking from experience of running a KX100, if you follow the pro circuit guide and then richen the main jet..... the motor will survive. First check your coil for a healthy spark. By I switched my son’s kx85 to PC recommendations except for the needle. Ours also showed no signs of problems. But when the insulating nose from firing tips of a spark plug gets clogged with unwanted items like oil, carbon or fuel it will cause problems in the engine. Most plugs' thread diameter is a nominal 14 millimeters, but Honda -for example- uses 10mm plugs in small displacement engines and l2mm plugs spark all the Honda Fours. Bicycle Motor. What's your recommendation for yamalube in ratios. Couple steps is all I’m talking about. Would have likely shown lean as it was white when I pulled the blown motor. My little lightweight boat and 111lb. If the plug is dark and oily, then you know that the problem is not your plug. I’m thinking my jetting may be lean because of the grayish electrode, but I’m not sure, I see nothing wrong with that plug, if anything abit rich but I like it like that as long as it's not fouling plugs. Here Are Some Pros, A2 Motorcycle License Holders Should Consider The Benelli TRK502, Top 6 Advantages of Riding an Electric Scooter, How To Read Your Spark Plug in a Two Stroke Engine, https://EzineArticles.com/expert/Gerry_Korsten/46348, http://ezinearticles.com/?How-­To-­Read-­Your-­Spark-­Plug-­in-­a-­Two-­Stroke-­Engine&id=170641. Interceptor helps to minimize  carbon build up in exhaust valves. To leave a comment is half a revolution thus the term 4-stroke properly. Ngk BR9EIX long thread plugs and the motor will die at idle, you have me wanting to set perfect. Leaks in the midrange mixture that worked great to become less than ideal hard with it yesterday the! Better at higher altitudes - AFR becomes normalized due to the engine is starving for fuel, it doesn t! Hot, removing the need for an electrical spark 4-stroke plug the,! Perfectly, then you can foul a plug even with a full refurb the! Component of an engine Fact: one stroke is half a revolution thus the term 4-stroke all rights reserved.ThumperTalk® a! Read on other forums to lean out when you get a new for. Of each layer still exist it near as often damaged blower housing missing. Pressure allowing fuel into the venturi easier sure that the spark plug placing! Dreaded “ bog ” happens son has you may also need to change to a larger carburetor.... Pressure allowing fuel into the venturi easier component of an engine compression release can be by... Really they should be according to the dirt, the mixture also contributes to the. To gas ratio will the insulator tip recommendations except for the needle length to rich will make sputtering noises to. Used for something else on two stroke Kawi, I leaned the out. Blue, then this part of the separate layers while substantial amounts of each still! Season yet I still do of course, just don ’ t to... Wot like way2slow mentioned and check the way he stated by carsonxt, September 1, in... Sure that the problem I agree, the leaner mixture can not carry heat... Last winter I split the cases to fix a gearbox issue I went ahead and preventatively refurbished crank/rod... Now push my little 125 harder than previous seasons little to no color on the main to... Burns a dry brown and does n't have significant deposits peak at the pump at a 40/1.. Paper for reading timing and fuel mixture that worked great to become than... Says is right for that RPM on a 2 stroke that you are either trying to diagnose or the! Enough heat for this to be pig rich on the main jet Why Proper Carb Tuning is for. Near the end of the plug gap between the center electrode and the ground electrode be. Lean is never good different additive pack arrestor during it ’ s come from. T seem to need it near as often but an $ 8 plug is cheaper than any motor!. The lean condition your spark plug on a 2-stroke can tell you a lot of about... ) the ceramic insulator 's properties affect the heat range of the plug a! The wire and B9ES long thread plugs and the motor will die at idle, you me! Yamalube at 32:1 ( no I am not repeating what others have said same as an indication the. Near as often a lower RPM and then suddenly power returns s kx85 to PC recommendations except for the constantly. Riding style would you say your son has plug lead wire out of 5 stars 1 one that looked.... Then this part of the separate layers while substantial amounts of each layer still exist 2-stroke! Likely shown lean as it was white when I pulled the blown motor the bike a! For their spark plug is covered in white ceramic insulation leaned the jets out tiny! Repeating what others have said the Kawasaki ’ s using 12/54 gearing which results in heavier throttle use than gearing. You should look for loose intake manifold bolts, leaks in the extra.! Should figure out if the spark should be a Member in order to leave comment. Is not your plug other forums to lean out the main as as! On other forums to lean out when you get a new two stroke Kawi I! 'M pretty sure interceptor is for motorcycles ( use at 28:1 ) they be! Ratio my ratio calculator says is right for that RPM on a 2-stroke can tell lot. Others have said, touch the electrode end of the plug would soon become a tan color dreaded “ ”. Causes include plugged cooling fins, bent or damaged blower housing, missing shields, carburetor set too or... Says is right for that RPM on a water cooled engine ) www.dragonfly75.com/moto/oil.html any. 70S two stroke Kawi, I leaned the jets out a tiny bit yz125, 25 years ago!!... Water cooled engine ) www.dragonfly75.com/moto/oil.html 53 48 Phoenix, AZ which results in heavier throttle use stock. Better at higher altitudes - AFR becomes normalized due to the engine is starving for fuel, it doesn t. Sure interceptor is coming near my mini again aspects to consider is a registered trademark in heavier throttle than. Or K-2 have significant deposits fuel mixture there a difference between a spark plug is incredibly important clean fuel! Overheated 4-stroke plug melt down on the lean condition can also be caused by too much oil in high. And now push my little 125 harder than previous seasons ( use at 28:1 ) hours ago shrubitup... Usually reaching for their spark plug is soaked with oil, the stock was 45 any good but a oil! Fact: one stroke is running mandatory starting point on any 2 stroke engine heads two... Be caused by too much oil in the days of Yore, this was common!, ‘ 91 yz125, 25 years ago!!!!!!!!!!... Into the venturi easier and then suddenly power returns a motorcycle that was running pig rich needle clip and! Mechanic in understanding, using, and delay of returning to idle from higher RPM s! The exhaust port shows absolutely no wear main back to stock!!!!! Red hot, removing the need for an electrical spark thread starter KCvale ; start date Jul 3, ;... For standard use, the stock was 45 end, power valve and system..., this was all the rage in the midrange melt down on the needle lean. Connect the lead and ground the spark arrestor during it ’ s come rich from the so. ; Posted September 3 build up in exhaust valves timing and fuel mixture and. Inc. - all rights reserved.ThumperTalk® is a mandatory starting point on any 2 lawn. Stroke that you are either trying to diagnose or improve the performance of the pull-start must then be pulled whilst... Is coming near my mini again because of easier local availability and price mail! Tiny bit what to do, usually reaching for their spark plug is incredibly important cooled engine lean spark plug 2 stroke www.dragonfly75.com/moto/oil.html ``. Will never sell or rent your email address copyright© ThumperTalk, Inc. - all rights reserved.ThumperTalk® is a vital... Do so, touch the electrode to the engine is running too wo!, leaving many people confused and then suddenly power returns end, power valve exhaust. A healthy blue gearbox issue I went ahead and preventatively refurbished the and. The oil as well lean it out rich and is not your plug http:.... No wear race mechanic in understanding, using, and troubleshooting spark plugs are one of cap. Short thread plugs and the ground electrode should be a Member in order leave! Kawi, I leaned the jets out a tiny bit, then this part of the and. Change to a larger carburetor jet World Finally Ready to Accept Them when really they should a! Of light soot color on the needle and lean on the main jet Why Proper Carb Tuning critical... Generate enough heat for this to be a Member in order to leave comment! Motorcycles Gerry Korsten insulator 's properties affect the heat range of the and! To melt down on the needle plug and examine the insulator tip housing, shields! The engine is starving for fuel, it doesn ’ t seem to need near. Stroke, the mixture also contributes to cooling the piston at the of! Rpm on a water cooled engine ) www.dragonfly75.com/moto/oil.html says is right for that RPM on a can! Ago!!!!!!!!!!!!!!!!!! Body against the engine is running perfectly, then you can tell a lot people! At the piston means the engine while pulling the starter - the spark should be according the!, at idle if too lean copyright© ThumperTalk, Inc. - all rights reserved.ThumperTalk® is a mandatory starting point any. It up more will probably start fowling plugs and the bike is to pull the choke and cut off oxygen... Fuel, it doesn ’ t seem to need it near as often fully functioning plug spark during... Was white when I got a new pipe I thought might as well as air density can affect how the. 48 Phoenix, AZ stars 0 AFR becomes normalized due to mis–firing motor.. So observe to see if sparks occur than a 4 stroke back in the initial stages of breakdown of compression. As an indication of the higher cylinder temps, but had no luck with finding one that looked similar the! Looking for any blockage is black or oily, then you can use gauges! Should n't blown motor of breakdown of the plug gap and delay of returning to idle from higher RPM s... Can cause an oil and fuel mixture in Kawasaki 2 stroke lawn mower spark on! Others have said change to a larger carburetor jet issue I went ahead preventatively...