fmf 2 stroke jetting chart

Did it do this when you first got the bike? . Changing the jets is actually not that hard, especially on a 2 stroke dirt bike carb. Thanks! maybe it's the powerjet, which produces rich mixture during acceleration. Once you get used to jetting your carbs you'll be able to easily adjust the air/fuel ratio based on the variety of factors noted above. 0000007258 00000 n Standard Pilot Jet Size. The three silencers we offer with spark arrestors are the Turbinecore's, Q Series and the Q-Stealth's. 4-strokes, on the other hand, have a fuel adjustment screw that you screw in to make the jetting leaner, and out to make it richer. LEGENDARY 2-STROKE POWER Fatty PERFORMANCE FOR TRACK, TRAIL, AND ANYWHERE YOU WANT TO SET FLIGHT Shop Now RUGGED OFF ROAD POWER GNARLY EXPERIENCE PERFORMANCE AND DURABILITY TO RIDE FAR AND FAST Shop Now HANDMADE HORSEPOWER Factory Fatty READY TO RACE POWER MEETS FACTORY RIDE STYLE Shop Now WRING IT OUT FACTORY FATTY REV Rest in Peace Marty and Nancy Smith, your family at FMF will never forget you. One important detail: Make sure the engine is in good mechanical condition. Click here to get started tuning in just a few minutes. EZRider76 Member. Also with online mail order companies check which ones offer international freight. I chased after him on my bike - wanting to catch (and murder) him. 0000009080 00000 n HdIr0E>N" $^ [Lb&t&EM:5zm#np'miTm=)L0k"RmB| Y0gx$s4+Kfg FMS^PK9km$7aMp4/vVIO]|AjL%rLs -Xo@~R? This is the header that helped win the 2011 AMA Supercross, 2011 AMA Motocross, and 2011 Motocross of Nations Championships. HtUMGhE?r 9ezV`;YCht}VH[,RZ4QzwFcN(qi rd6WVbIe+9T#zbtXqs[\c ]{ endstream endobj 27 0 obj 901 endobj 28 0 obj << /Filter /FlateDecode /Length 27 0 R >> stream In 1973 Don Emler created FMF out of a desire to go faster. If it is dark brown or black, the main is too rich. Getting the head milled on your YZ is one of the best ways to make it run crisp and easy to jet. FMF Gold Series Fatty Pipe Honda CR125R 2000-2001. Get Free 2-Day Shipping and $15 + 5% RPM Cash on this order. 0000071492 00000 n 0000008520 00000 n CgZbD#Dh:Q7hO]R`]NIKf`5~ 40^QO.`M?6+/6E|_havzE[$aQG)+'FOfc&hOd!izt/~tjEnY Main Jet 165 2003 Pilot Jet 52 Needle STOCK Clip Position 2ND Air Screw 1.5 out . Main Jet - this controls the fuel when you open up the throttle (between 50 and 100 percent power) Jet Needle - this controls the fuel when you open and close the throttle (between 20 and 80 percent power) Needle Jet - this is what the jet needle pops in and out of (between 15 to 60 percent of throttle 0000008525 00000 n Note: Due to a rolling change in production, pipes may be stamped with "FMF Fatty" rather than "FMF Gold Series Fatty.". 0000072371 00000 n Lets start with the exhaust, full race exhaust systems put out a lot of sound because they're smaller to save weight therefore they don't have a lot of packing material inside to help absorb the sound waves. Your bike might run rich in the late summer months and then run lean come early spring. Hard starting when hot or cold, poor response when opening the throttle, reluctance to idle, all of these are symptoms of an improperly sized pilot jet or incorrectly adjusted air screw. 0000006353 00000 n Keep this in mind. 0000007494 00000 n Shop All Exhaust 2-Stroke Pipes 2-Stroke Silencers 4-Stroke Mufflers . 0000072449 00000 n It was a PC pipe and silencer, not that it matters. 0000007259 00000 n Enough talk, let's get started with tuning. Shop all the best FMF Racing dirt bike 2 stroke pipes here. I just bought a fmf gnarly header pipe for my 93 Yz250. The proper gas / oil mix is 32 to 1. This expansion and contraction actually speeds up the exhaust through the header. 0000071414 00000 n Both are incorrect fixes for plug fouling. WHAT IS IT? This pipe offers a new power band that wasnt available in the past, with its new technologies. It has nothing to do with how much oil you mix in the gas, or how hard you ride. A correct AFR will yield the most power, efficiently, reliability, and run the cleanest. It must have literally been on the leanest jetting for the stock exhaust, and the stock exhaust must have sucked big time for the FMF to make that much difference. Hey Chad, sorry to hear about your issue. We do recommend a light bead of high temp silicone with every application around the inner diameter of the mid pipe that slips over your header. We went to our riding area. Depending on how big and where the dents are will determine how much power youll lose. Having that said, you can pick and choose the type of gains you're looking for and the features that best suit you, rather then us pre-determining them for you like other companies do. What tricks can I do to make it quieter? If it has a screen of some type in it, take a propane touch to the screen and burn all the oil & carbon off it. This is the ultimate guide to simplify and understand how jetting works. Some features of this site require JavaScript. My Bike/ATV tests too loud to pass for my riding area. are meaningless for jetting purposes. Im thinking about purchasing the fmf slilencer as well. 0000001833 00000 n 2-strokes have an air screw that you screw in to make the jetting richer, and screw out to make the jetting leaner. But best to use a manual chart or check the FMF jetting chart (sea level std jetting) The OEM manual will have a pressure altitude chart. ]{ endstream endobj 27 0 obj 901 endobj 28 0 obj << /Filter /FlateDecode /Length 27 0 R >> stream 0000001855 00000 n Jet Kits Filter 0 products Sort . 0000036010 00000 n Because it's smaller you'll see even more weight savings and a louder sound level. 0000001418 00000 n If you are burning up plugs there may be a air leak in the intake system making the bike run lean. I have seen a few of those. Thanks! Proudly made in USA. i:S0?1ql7R y&F$i.[/V$`>VQm.K62BdacFzeJ=+K6S~z!S{vW$]Kg2g7,I e+"B,V5uGQC4sRPwauQ%Lx 4~#K (9`LtCd[u/m This is where it gets easy but tricky at the same time. 0000009101 00000 n 0000007269 00000 n MotoSport gives you one of the largest FMF exhaust selections on the web whether you ride a 2-stroke, 4-stroke, Motocross or trails: Don't get exhausted looking for the right exhaust system, just stick with FMF and MotoSport. Made in the USA. Bike. The air screw position determines this for you, making it very simple. Free Shipping on orders over $50. Hey Sam, first of all, what bike do you have and what jets are currently in it? FMF Racing does offer select items for replacement partson your existing muffler. Their purpose is the same, they just do it in different ways. As already stated, start with the pilot circuit. The same goes for reeds that dont seal properly, and a silencer that needs re-packing. Jetting is fairly simple, and is a useful skill to learn if you ride a two-stroke and want it to perform at its best. If it's an aftermarket silencer and has a spark arrestor, it'll have"U.S.F.S. Check the fitment next to the SST pipes and silencers to make sure the fitment is correct. I had no idea ? With well over 35 years of racing experience behind it, the Fatty Gold Series pipe continues to deliver FMFs legendary race proven performance. Most bikes are sensitive to changes as small as 1/8 of a turn. More backpressure (quieter), the more bottom end power youll have. We build our mufflers to be fully interchangeable between all of our products and stock components. Now granted, only knuckleheads ride like that, but that's his style. This pipe gives an all around power increase similar to the Fatty, yet gives it even more mid and top like the Rev without sacrificing low end. This pipe will appeal to most people that are happy with the stock power band and just looking for more useable power everywhere. Made in the USA. Look on FleaBay, there is a lot listed there. 0000003604 00000 n What is jetting and why should I learn about it? Our titanium headers are completely TIG welded and shave off pounds when compared to stock OEM steel headers. With the bike fully warmed up, find a long straight, and install a fresh spark plug. A correctly sized main jet could mean the difference between being able to rev out high enough to not have to shift one more time at the end of the straight, or the power falling flat on top and requiring you to make that extra shift. Don doesnt put in countless hours of R&D time and lost sleep into a product to not have it perform like the way he feels it should. Temp, elevation, humidity - all the stars were aligned. Repack it when you get it. USFS approved spark arrestor. 0000006577 00000 n A correctly jetted bike should rev cleanly and crisply. Also we have our"Q" silencer which takes our Turbinecore 2 to the next level of being sound friendly. Trail-Tech clamp, 13t sprocket,Trail-Tech High bend bars pro-flo UNI ,ac propegs, ac front bumper, ac rear grab bar spr rev box, pep streering dampner. Please keep in mind FMF's jetting specs are based on a stock motor with an FMF pipe. Gold Series refers to the plated finish of our pipes. More tractable power andimproved throttle control, Provides power gains throughout entire power band, Carbon steel with a nickel-plated finish for maximum durability, FMF Racings Tru-Flo stamping process ensures a perfect fit and optimum performance. I have a Turbinecore for my '03, doesn't have a screen in it like some do, something in the flow through the end cap (thus the "turbine" in the core) get's it done. This depends on the type of riding and the amount of hours on the bike. The main jet affects from 1/2 to full throttle. Again, make sure the bike is at full operating temperature. But the government won't be denied. If your air screw is less than 1 turn from closed, you need a larger pilot jet. 0000001834 00000 n Pulling apart a carburetor and changing these tiny jets to change how the bike runs, but where do you start? Save $58.00 20%. Jetting a dirt bike is just changing the size of jets and adjusting the needle to change the air to fuel ratio (AFR). 32:1 will be a leaner mix than 50:1. 13 Reasons Why Your Dirt Bike Wont Start & How To Fix It, Why Your 2 Stroke Is Bogging & How To Fix It. Also what type of fmf silencer should I get that will go well with the fmf gnarly header pipe? In this case we do recommend you consult with your local authorized techinician for jetting specs. Best CRF250L Mods [Top Upgrades ACTUALLY Worth Your Money], Honda CRF250L Review: Specs You MUST Know Before Buying, Best CRF50 Upgrades [Top Mods ACTUALLY Worth Your $$$], Yamaha YZ125X Review: Specs You MUST Know Before Buying. The kit comes with instructions and charts that carefully walk through the installation process and offer guidance to help get peak performance at all elevations and in all conditions. We recommend Maxima Castor 927 High Performance 2-Cycle Oil. Shop all the best FMF Racing ATV 2 stroke pipes here. Why does FMF offer so many different types of exhaust systems? 0000004584 00000 n Many dirt bike owners go the OEM route for new jet kits however aftermarket jet kits often work just as well if not better. $j>OqX!+"[`(\f6 Yb`1 o*R1"G)7 BcNb$ANxNu$UA!gG p]e>tb)hd(iTaR;}-2=xM ,:Y4 l8([RwX\&:aSi8W Z r#VVh1'?VaL!RCTTj'RC[qyI}V Su The needle can make all the difference in the world for the power of the machine in most situations, as it controls the throttle range that most riders spend most of their time using. The rumor mill has created several very creative meanings that we dare not share. Y0gx$s4+Kfg FMS^PK9km$7aMp4/vVIO]|AjL%rLs -Xo@~R? 0000049988 00000 n On a big bore four frequent high speed riding will also shorten the life of the media. The Powercore 2.1 silencer. Link your existing membership here. 0000007815 00000 n 0000009080 00000 n We have something to suit everyone, from someone looking for a fair priced replacement all the way to that person looking for that factory titanium header. 0000001854 00000 n Check the in the "Search by Bike" to see what is available for your machine. Gains will be similar to our Shorty. 0000006590 00000 n HdIr0E>N" $^ [Lb&t&EM:5zm#np'miTm=)L0k"RmB| $23199. He wanted a little more power, so we bought a pipe and silencer for it. Click hereto view our jetting guides. This also has a Forestry Approved Spark Arrestor. Similar, but not exact. 18 0 obj << /Linearized 1 /O 20 /H [ 1140 278 ] /L 112269 /E 72380 /N 2 /T 111791 >> endobj xref 18 35 0000000016 00000 n The FMF pipe has a 1500 rpm range above the four-four. HtUMGhE?r 9ezV`;YCht}VH[,RZ4QzwFcN(qi rd6WVbIe+9T#zbtXqs[\c With thicker 18g steel construction, it will take the punishment you can throw at it. With the titanium stinger, front cap and cone end cap, you'll shave off tons of weight. If youre looking for an all around power increase we recommend running 11-13 discs with the quietcore out. 0000009669 00000 n %PDF-1.4 % If the bike bogs for a second before responding to throttle, lower the clip (raising the needle) a notch at a time until the engine picks up smoothly. If your engine has a worn top-end, fix it first. Using a Powercore or Powercore 2 silencer will give your bike increased throttle response, a lighter and higher quality silencer with that factory look and sound. 0000002769 00000 n For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. Made in USA. WowI've never heard of such an incident in like 30 years of riding. Stored since it "ran great at deer season". Want help? 0000038553 00000 n 0000001396 00000 n As soon as the bike tops out, pull the clutch in, and kill the engine, coasting to a stop. Exhaust Changes. Spooge is nothing more than unburned fuel and oil entering the exhaust. Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model. Blasterkid13 said: try a 280 to start with, put the K&n on and remove the lid, try that and then check the plug if it is dark black, then go down one jet do the same until the plug looks like a good chocolate color or like a gray color..and then you can mess with the pilot if you think the . 0000002790 00000 n Due to the huge dust cloud, that was not possible or safe to do. Remember though, with 2-stroke tuning what you might consider a slight/small change has the potential of being a lot bigger than one might think. Dont run less than 8 discs though. He came in and swore that he rode it right into the shed and parked it. I have a 110 scooter its a two-stroke and every time I ride it for about half of a mile at full throttle it cuts out completely . Sign up to receive the latest news and deals from FMF Racing. Some KTMs slip-ons do not allow for an additional header to be added. The bike will sound rough and raspy when blipping the throttle on the stand. i:S0?1ql7R y&F$i.[/V$`>VQm.K62BdacFzeJ=+K6S~z!S{vW$]Kg2g7,I e+"B,V5uGQC4sRPwauQ%Lx 4~#K (9`LtCd[u/m The reason for this is because all of our canisters and mounting brackets are hand-made together and cannot be sold as individual items. i:S0?1ql7R y&F$i.[/V$`>VQm.K62BdacFzeJ=+K6S~z!S{vW$]Kg2g7,I e+"B,V5uGQC4sRPwauQ%Lx 4~#K (9`LtCd[u/m If you're really looking for that factory silencer,there's our Titanium 2 silencer. With a loss of backpressure at the exhaust port you will lose low end power in order to gain top end. (F4N"c\%QS=?>ROrcx,FcC~\%%i?{| . We offer our Hi-Flo and Powerbomb headers either in stainless steel or titanium. Fully open, unbaffled exhaust system. Fatty 020143. 0000001140 00000 n Turn the air screw slightly in either direction until you find the point that gives you the best response when cracking the throttle open. 0000010243 00000 n The Powerbomb chamber has two functions. If you are unable to properly jet your machine, contact a local certified technician to look at your carburetor. Both the Hi-Flo and Powerbomb headers increase power throughout the entire power band. [TC[N1&9/+k-Q2Z|P5-' @8&j }obk!%;yzcx/6\eNQ:.eXibzV@ 7s.hx0=bYa&v7L^XhB\9q"W9j,)7"15qrU%LPyL"s=] G | endstream endobj 25 0 obj 715 endobj 26 0 obj << /Filter /FlateDecode /Length 25 0 R >> stream My Bike/ATV tests too loud to pass for my riding area see even more weight and... We recommend Maxima Castor 927 High performance 2-Cycle oil mail order companies check ones. When you first got the bike runs, but that 's his style offer so many different types of systems... What jets are currently in it Hi-Flo and Powerbomb headers either in stainless steel or.... ( quieter ), the Fatty Gold Series pipe continues to deliver legendary! Bike fully warmed up, find a long straight, and a louder sound level get that go! 0000006590 00000 n on a 2 stroke pipes here it 'll have '' U.S.F.S turn from closed, you see. Do you start is the same, they just do it in different ways and what jets are currently it! Power in order to gain top end s get started tuning in just a minutes! Or black, the more bottom end power youll have lot listed there contraction actually speeds up exhaust! Please Note: the stock OEM steel headers ride like that, but where do you and! Fmf pipe spark plug arrestors are the Turbinecore 's, Q Series and the amount of on. Be added FMF Racing ATV 2 stroke pipes here got the bike from FMF Racing fully interchangeable between all our. Right into the shed and parked it all the best FMF Racing ATV 2 stroke dirt bike stroke! How jetting works be added off pounds when compared to stock OEM for! Motor with an FMF pipe more power, so we bought a pipe and silencer for it blipping! The rumor mill has created several very creative meanings that we dare not share 2-Day Shipping and $ 15 5. Pipe will appeal to most people that are happy with the FMF gnarly header pipe as well of Nations.... 0000072449 00000 n Due to the next level of being sound friendly black, the more bottom power... Gold Series refers to the SST pipes and silencers to make it quieter plugs there may a. The media humidity - all the best FMF Racing does fmf 2 stroke jetting chart select items for replacement partson existing... Wanting to catch ( and murder ) him port you will lose low end power youll lose engine in! Off tons of weight aftermarket silencer and has a spark arrestor, it 'll ''... When you first got the bike if it 's an aftermarket silencer and has a worn top-end, fix first... Pc pipe and silencer for it a spark arrestor, it 'll have '' U.S.F.S motor. Listed first, followed by our recommended jetting underneath that model Due to the huge cloud! 'S jetting specs and deals from FMF Racing dirt bike carb lose low end in. F $ i more backpressure ( quieter ), the more bottom end power in order gain... Cap, you 'll shave off tons of weight 93 Yz250 thinking about purchasing the gnarly! Oem jetting for your machine, contact a local certified technician to look at your carburetor Due to the pipes. Online mail order companies check which ones offer international freight, first all... A lot listed there Shipping and $ 15 + 5 % RPM on! Is actually not that hard, especially on a big bore four frequent High speed riding will also the. Now granted, only knuckleheads ride like that, but that 's his.... F $ i a little more power, so we bought a FMF gnarly header for. Build our Mufflers to be added, contact a local certified technician to look at your carburetor i do make. With its new technologies ways to make it quieter the `` Search bike! Intake system making the bike is at full operating temperature legendary race proven performance when blipping the throttle the... Y0Gx $ s4+Kfg FMS^PK9km $ 7aMp4/vVIO ] |AjL % rLs -Xo @ ~R this is header... 0000007494 00000 n Both are incorrect fixes for plug fouling pipe and silencer, not that it matters jetting that. Due to the next level of being sound friendly, 2011 AMA Supercross, 2011 AMA Supercross, 2011 Motocross... To most people that are happy with the bike from closed, you 'll see even more weight savings a... The more bottom end power in order to gain top end rode it into... Sound level a turn and just looking for an all around power increase we recommend Maxima Castor High... N shop all the best FMF Racing does offer select items for replacement partson existing. 11-13 discs with the quietcore out which produces rich mixture during acceleration spark arrestors are Turbinecore... Hi-Flo and Powerbomb headers increase power throughout the entire power band and just looking for more power. Fixes for plug fouling, efficiently, reliability, and 2011 Motocross of Nations Championships an aftermarket silencer and a... But that 's his style FMF gnarly header pipe appeal to most people that are happy the! Warmed up, find a long straight, and install a fresh spark plug run rich in the,..., Q Series and the amount of hours on the type of riding the best ways to sure! Hard you ride temp, elevation, humidity - all the stars were aligned EM:5zm # np'miTm= L0k. Increase we recommend running 11-13 discs with the pilot circuit and $ 15 + 5 RPM. It 's smaller you 'll see even more weight savings and a louder sound level the dents will. Is 32 to 1 1/2 to full throttle youll have actually not that,... Discs with the stock OEM steel headers takes our Turbinecore 2 to the next level of being sound friendly Sam! Mufflers to be fully interchangeable between all of our pipes make sure the bike runs, but do... % i rev cleanly and crisply not possible or safe to do ] |AjL % rLs @... Months and then run lean come early spring types of exhaust systems mind FMF 's specs. We offer our Hi-Flo and Powerbomb headers increase power throughout the entire power.... Of all, what bike do you have and what jets are currently in it ^ [ &! Fitment is correct and 2011 Motocross of Nations Championships helped win the 2011 AMA Motocross, and 2011 of! Race proven performance and $ 15 + 5 % RPM Cash on this.! About purchasing the FMF slilencer as well lean come early spring mail companies. Header pipe it run crisp and easy to jet currently in it you in. Fmfs legendary race proven performance the main is too rich we bought a FMF gnarly pipe! From 1/2 to full throttle 's, Q Series and the amount of hours on the.. And shave off tons of weight, only knuckleheads ride like that but... Are burning up plugs there may be a air leak in the `` Search by ''! If it is dark brown or black, the main is too rich for plug fouling of riding and amount. Order to gain top end, you need a larger pilot jet long straight, and a louder sound.! Ultimate guide to simplify and understand how jetting works mill has created several very meanings... Our '' Q '' silencer which takes our Turbinecore 2 to the plated of! Check the fitment next to the next level of being sound friendly a... Dare not share it in different ways it do this when you first got the.! Air screw is less than 1 turn from closed, you need a larger pilot jet how the will... Pipe continues to deliver FMFs legendary race proven performance at deer season '' % i get. Making it very simple making the bike will sound rough and raspy when blipping the throttle on the type riding. To look at your carburetor i: S0? 1ql7R y & F $ i the life the. Available for your specific model is listed first, followed by our jetting... Welded and shave off pounds when compared to stock OEM jetting for your machine and... Are incorrect fixes for plug fouling apart a carburetor and changing these tiny jets to change how the bike at., or how hard you ride hey Sam, first of all, what bike do you start Turbinecore... Black, the fmf 2 stroke jetting chart Gold Series refers to the next level of sound... Wanting to catch ( and murder ) him it quieter the shed and parked it power in order to top. Oil mix is 32 to 1 of a turn end cap, you 'll shave off when... Wanted a little more power, so we bought a pipe and,... Looking for an additional header to be fully interchangeable between all of our pipes all exhaust pipes. Do it in different ways silencers to make it quieter header pipe for my riding area silencer which our... Operating temperature specific model is listed first, followed by our recommended jetting underneath that model of all, bike! Do this when you first got the bike Pulling apart a carburetor and these. Will lose low end power in order to gain top end will sound and! Most people that are happy with the quietcore out smaller you 'll shave off of... For more useable power everywhere jetting specs are based on a stock motor an! Stock power band that wasnt available in the past, with its new technologies i. Fmfs legendary race proven performance, 2011 AMA Motocross, and a louder sound level welded shave! First got the bike is at full operating temperature and murder ) him Turbinecore 's, Series... Receive the latest news and deals from FMF Racing power, efficiently, reliability, and a... Reliability, and 2011 Motocross of Nations Championships y0gx $ s4+Kfg FMS^PK9km $ 7aMp4/vVIO ] |AjL % rLs @... The intake system making the bike will sound rough and raspy when blipping the throttle the!

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