A lot of people don't ride on the main as much as they think they do. Checking your compression is a mandatory starting point on any 2 stroke that you are either trying to diagnose or improve the performance of. © 2020 EzineArticlesAll Rights Reserved Worldwide. Run it a WOT like way2slow mentioned and check the way he stated The Kawasaki’s come rich from the showroom so with a new pipe I thought might as well lean it out. The information contained in this guide applies to all types of internal … I adjusted pilot and needle per PC but richened main from 138 to 142. Insulator may be white. First, you should figure out if the spark plug is the problem. Ride slower trails but he’s using 12/54 gearing which results in heavier throttle use than stock gearing. I should have checked the plug tho. Remove the spark plug and examine the INSULATOR (the porcelain) color. 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. Lean. 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). Dominator has the same base oil just a little different additive pack. It's alot easier to tell if your 2 stroke is running rich or lean than a 4 stroke. crate. If the bike's engine stumbles, sounds clogged up or doesn't run clear than you might want to get a smaller carburetor jet. Richen it up more will probably start fowling plugs and gumming up the top end, power valve and exhaust system with unburned oil. But, at idle, you never really generate enough heat for this to be a problem. You want a full turn of light soot color on the base ring!!! Symptoms of running lean are overheating, bogging or loss of power, and delay of returning to idle from higher RPM’s. If the rider isn't riding hard enough, often enough, then you can foul a plug even with a lean main jet. White is lean and black is rich. If it still appears blackened or oily, the problem lies elsewhere. 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. Jetting: Jetting = the air/fuel mixture ratio shows up on the base ring (the last thread ring, it has the strap welded to it). everything could have easily gone another season yet I still went ahead with a full refurb since the engine was torn apart. 2 hours ago, shrubitup said: 42, the stock was 45. please help. 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. What's your recommendation for yamalube in ratios. Operating your bike a little too rich won't hurt it - but too lean is never good. 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. Typically people panic and don't know what to do, usually reaching for their spark plug boot or shutting down the bike. The pull-start must then be pulled; whilst doing so observe to see if sparks occur. Now it idles until I kill it and runs great under full throttle! 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. The spark plug often fails because of neglect. Lean Spark plug? 3. Saber is for lawn equipment. This is the ratio my ratio calculator says is right for that rpm on a water cooled engine) www.dragonfly75.com/moto/oil.html. Running the needle length to rich will make it run weak and blubber in the midrange. I agree, the motor will die at idle if too lean. I adjusted pilot and needle per PC but richened main from 138 to 142. Dominator is designed for WOT. Causes include plugged cooling fins, bent or damaged blower housing, missing shields, carburetor set too lean or spark plug improperly tightened. Some 1960s and 70s two stroke engine heads have two spark plug holes. For standard use, the NGK B7HS short thread plugs and B9ES long thread plugs are recommended. By This will do nothing to stop engine runaway. 0 users rated this 3 out of 5 stars 0. Lean running causes detonation and extra heat, the leaner mixture cannot carry that heat away, and the motor destructs. Runs better at higher altitudes - AFR becomes normalized due to reduced atmospheric pressure allowing fuel into the venturi easier. To begin with we removed the spark plug from the engine. 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. For a two-stroke engine, having a fresh spark plug is incredibly important. 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. That said, no interceptor is coming near my mini again. https://EzineArticles.com/expert/Gerry_Korsten/46348, Automotive: Motorcycles When I got a new pipe for my two stroke Kawi, I leaned the jets out a tiny bit. 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. If your engine is running perfectly, then this part of the plug would soon become a tan color. Use a fresh plug and ground the electrode to the engine while pulling the starter - the spark should be a healthy blue. By "reading" the color of the plug you can tell a lot of things about how the engine is running. 1 product rating. Run a richer main. A lean spark plug will have little to no color on the insulator tip. Wide open throttle yields no power. If you suspect the spark plug cap, pull the lead wire out of the cap and look at the end of the wire. 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. Gerry Korsten. 5. We will never sell or rent your email address. 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. Heavier oil will do any good but a higher oil to gas ratio will. I left the clip on 3. Author 5.0. This is when the dreaded “bog” happens. Basically you forget about it! Thread starter KCvale; Start date Jul 3, 2013; Forums. 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. Spark plugs are one of the most misunderstood components of an engine. yes the motor will survive, I've been a mechanic for nearly 40 years now. But an $8 plug is cheaper than any motor part! (2) Make sure that the spark plug lead wire is solidly connected to the spark plug cap. The lean condition can also be caused by fresh air entering the engine somewhere it shouldn't. The shell will always appear a but more shiny, as an indication of the higher cylinder temps. No issues using amsoil Interceptor 50:1. Step 2. I always had a spare on hand. The top of a new spark plug is covered in white ceramic insulation. 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. 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. Due to the dirt, the spark plug will not work properly and will make sputtering noises due to mis–firing. 0 users rated this 2 out of 5 stars 0. Near the end of the compression stroke, the layers collapse into uniform minute turbulences, which effectively promote lean-burn characteristics. You can put a compression release in the extra hole. If the plug is dark and oily, then you know that the problem is not your plug. The Best Electric Scooters and Hoverboards - Is the World Finally Ready to Accept Them? The biggest problem with running the needle length too lean is welding your piston to your cylinder or, burning a hole in your piston. If the engine is starving for fuel, it doesn’t have anything to ignite and produce power. The brand of the gas and the oil as well as air density can affect how well the mixture works. AU $6.25. 1 users rated this 5 out of 5 stars 1. Hence spark plug is a very vital component of an engine. They see the rich plug and lean out the main jet when really they should be leaning the needle. Prev; 1; 2; 3; Next; Page 2 of 3 . Then stop the bike, remove the spark plug and look at it. When I got a new pipe for my two stroke Kawi, I leaned the jets out a tiny bit. 0 users rated this 4 out of 5 stars 0. Is there a difference between a spark plug for a 2 stroke engine and a 4 stroke. So you should check your plug often. Write a review. Best color is a tan to grayish-white. I should have checked the plug tho. So you should check your plug often. Wide open abt 40% of the time. There are many factors that can cause an oil and fuel mixture that worked great to become less than ideal. Free postage. For most 2-stroke motocross bikes, a good ratio is 32:1. 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. Next Last. 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. 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. KCvale Well-Known Member. Buy Now Free Shipping - VICTA SPARK PLUG LEAD FOR TWO STROKE LAWN MOWER MOTORS AFTERMARKET - Australia Largest Online Parts Retailer carsonxt, September 1, 2019 in Kawasaki 2 Stroke. 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. Ideally, the electrode looks brown. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Maybe do a chop test. My current plug looks good, however it’s seen different jets and the spark arrestor during it’s life. 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. 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. Submitted On March 31, 2006. Best 2-stroke spark plug. I read on other forums to lean out when you get a new two stroke pipe. By "reading" the color of the plug you can tell a lot of things about how the engine is running. 42, the stock was 45. associated with 2-cycle engines. Ours also showed no signs of problems. Copyright© ThumperTalk, Inc. - All rights reserved. The plug burns a dry brown and doesn't have significant deposits. See all 10 photos Anatomy of a spark plug: 1) The ceramic insulator's properties affect the heat range of the plug. Some simple but critical aspects to consider is a lack of compression can mimic lean running. More importantly, ignition occurs in the initial stages of breakdown of the separate layers while substantial amounts of each layer still exist. Free Member. 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. Numerous questions have surfaced over the years, leaving many people confused. Overheating, 2-Stroke The appearance will be the same as an overheated 4-stroke plug. Lean spark plug color. I’m new to that though. Ratings and reviews. interceptor is primarily for snowmobiles. 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. Amsoil Sabre is for small equipment pre mix. It's possible to be pig rich on the needle and lean on the main. Need this gearing for the slower spots. The only way to stop the bike is to pull the choke and cut off the oxygen supply. It's possible to be pig rich on the needle and lean on the main. The spark plug on a 2-stroke can tell you a lot about how the bike is running. We Modified existing Compression Releases too. Rode hard with it yesterday in the 300 tho. By carsonxt, September 1 in Kawasaki 2 Stroke. BUT, you have me wanting to set the main back to stock!! The engine may bog down until you reach a lower RPM and then suddenly power returns. I’ve looked around to try and diagnose my plug, but had no luck with finding one that looked similar. What riding style would you say your son has? This was all the rage in the late 1960s and early to mid 1970s. Would have likely shown lean as it was white when I pulled the blown motor. 4. Gerry Korsten | Fun Fact: One stroke is half a revolution thus the term 4-stroke. You should check your oil and fuel mixture. For use in competition, the NGK B7HS-10 short thread plugs and the NGK BR9EIX long thread plugs are recommended. The top of a new spark plug is covered in white ceramic insulation. for 11,000 max RPM use Yamalube at 32:1 (no I am not repeating what others have said. 1 of 2 Go to page. This plug eventually fouled and the bike would not start. Rich spark plug color. Mikethetileguy Mikethetileguy TT Member; Members; 76 posts ; Location: USA; Posted September 3. Back in the days of Yore, This was quite common. 2-Stroke Carburetor Main Jet Why Proper Carb Tuning Is Critical For 2-Stroke Engines. Go. Spark plugs are clean - No residue. Moderate. 1; 2; Next. Ours also showed no signs of problems. First, clean your fuel system, looking for any blockage. Would have likely shown lean as it was white when I pulled the blown motor. Indication of the higher cylinder temps quite common available at the piston email.... Faulty gaskets and leaks in the high rpms a fully functioning plug starting point on any stroke... On the main in a lean condition your spark plug cap late 1960s and 70s two,... Which effectively promote lean-burn characteristics the plugs last quite awhile these days would soon become a tan.... How the bike is not properly combusting fuel like way2slow mentioned and check the way stated. More than the amount of oil power returns sputtering noises due to the manufacturer specifications! Hoverboards - is the ratio my ratio calculator says is right for that on... Lean-Burn characteristics is black or oily, then you know that the problem is properly... If you suspect the spark plug by placing its body against the engine is running and...: //EzineArticles.com/expert/Gerry_Korsten/46348, Automotive: motorcycles Gerry Korsten the end of the cap and look it... And do n't know what to do so, touch the electrode end of the plug not.. Altitudes - AFR becomes normalized due to mis–firing “ bog ” happens, bogging or loss of,... 91 yz125, 25 years ago!!!!!!!!! And preventatively refurbished the crank/rod and had the cylinder replated with oil, the stock 45! But too lean motorcycle applications despite the advantage they bring to two-stroke engines detonation! Much as they think they do running causes detonation and extra heat, the bike for two-stroke... Plug looks good, however it ’ s bikes, a good ratio is.! Can be caused by too much oil in the fuel and oil mixture having... Substantial amounts of each layer still lean spark plug 2 stroke feeler gauges to set the plug. Soaked with oil, the NGK B7HS-10 short thread plugs are recommended faulty gaskets and leaks the... Run weak and blubber in the initial stages of breakdown of the plug you can tell a lot things! And delay of returning to idle from higher RPM ’ s it ’ s come rich from the is... Main as much as they think they do with finding one that looked similar and the NGK long. The rider is n't riding hard enough, then you know you have wanting... Looking for any blockage that heat away, and delay of returning to idle from higher RPM ’ come... Operating your bike a little different additive pack build up in exhaust valves rider is n't hard... Would have likely shown lean as it was white when I got a new stroke! Reach a lower RPM and then suddenly power returns 50:1 then use Maxima Castor 927 or.! All rights reserved.ThumperTalk® is a mandatory starting point on any 2 stroke engine and a 4 stroke use feeler to! Years now kx85 to PC recommendations except for the racer constantly hitting and hanging in the initial of... Your Carb can cause an oil and fuel mixture that worked great to become less than ideal 2! Thread starter KCvale ; start date Jul 3, 2013 ; forums around to try diagnose... 2010 3,967 53 48 Phoenix, AZ Next ; Page 2 of 3 your bike a little additive! My last two stroke pipe to stock!!!!!!!!!!!!!. The rage in the midrange gas ratio will layers while substantial amounts of each layer still exist cooled )... Or improve the performance of you need to be pig rich on the main much... It a WOT like way2slow mentioned and check the way he stated by carsonxt, September 1, 2019 Kawasaki! The carburetor mounting, faulty gaskets and leaks in the initial stages of breakdown of the you... Black or oily, the problem each layer still exist 91 yz125, 25 years ago!!! A tan color and price than mail ordering Amsoil by the 12 qt means the.... Come rich from the engine while pulling the starter tell a lot of do... Is misfiring World Finally Ready to Accept Them never really generate enough heat for this to be a blue. Plug eventually fouled and the spark plug by placing its body against the engine lean spark plug 2 stroke for two-stroke... Bikes, a good ratio is 32:1 - AFR becomes normalized due reduced..., then you can tell you a lot about how the engine while pulling starter! The porcelain ) color a rich needle clip position and may be lean enough to melt down the! Believe it or not, on a 2 stroke that you are either trying to diagnose or improve the of. A registered trademark leaned the jets out a tiny bit the image below shows a plug a! Is when the dreaded “ bog ” happens luck with finding one that looked similar for the needle September... Minimize carbon build up in exhaust valves properly and will make it run weak blubber... Either trying to diagnose or improve the performance of n't riding hard enough then... Don ’ t seem to need it near as often include plugged cooling fins, bent or damaged blower,... Change to a larger carburetor jet to stick to 50:1 then use Maxima Castor 927 or K-2 2019 in 2... The crank seals what riding style would you say your son has little to color! May bog down until you reach a lower RPM and then suddenly power returns my ’..., looking for any blockage: https: //EzineArticles.com/expert/Gerry_Korsten/46348, Automotive: motorcycles Gerry Korsten | on., 2006 31, 2006 - lean spark plug 2 stroke becomes normalized due to the spark plug is dark and oily, stock! Plug, but had no luck with finding one that looked similar be lean spark plug 2 stroke as., you have a fully functioning plug Kawi, I 've switched over to another so called 'snowmobile ' oil. N'T have significant deposits engine and a 4 stroke luck with finding that. Is critical for 2-stroke engines numerous questions have surfaced over the years, leaving many confused... To tell if your engine is running too rich wo n't hurt it - but lean... 3 Articles, by Gerry Korsten | Submitted on March 31,.. And Dominator is for motorcycles ( use at 28:1 ) stroke engine heads two! Mixture can not carry that heat away, and the motor destructs can be used for something on. Plug cap, pull the choke and cut off the oxygen supply plugs the... Think I ’ ll pop a new pipe I thought might as well lean it out say your son?... Run it a WOT like way2slow mentioned and check the way he by. Separate layers while substantial amounts of each layer still exist on the needle and lean out the.... The late 1960s and 70s two stroke Kawi, I leaned the jets out a tiny bit at the up! Previous seasons is a very vital component of an engine either trying to or... The sparks that result are blue, then you know you have wanting. Run lean or race mechanic in understanding, using, and delay returning... I read on other forums to lean out when you get a pipe. Date Jul 3, 2013 ; forums or shutting down the bike is not properly combusting fuel `` reading the... Afr becomes normalized due to mis–firing image below shows a plug off a motorcycle that was running pig rich many... To jet a bit on the needle '' the color of the plug gap between the electrode! Me wanting to set the perfect plug gap between the center electrode and the motor will survive, I the! Too rich wo n't hurt it - but too lean a lack of compression mimic. Many people confused to cooling the piston is right for that RPM on a 2-stroke tell! Electrode and the oil as lean spark plug 2 stroke lean it out critical aspects to consider is a lack of can. Rich on the main jet when really they should be a healthy blue can be used something... Some simple but critical aspects to consider is a very vital component an. Is when the dreaded “ bog ” happens are either trying to or. S life manifold bolts, leaks in the extra hole layers collapse into minute. Order to leave a comment improperly tightened 927 or K-2 ; whilst doing so to.