PERFORMANCE FOR TRACK, TRAIL, AND ANYWHERE YOU WANT TO SET FLIGHT, EXPERIENCE PERFORMANCE AND DURABILITY TO RIDE FAR AND FAST, READY TO RACE POWER MEETS FACTORY RIDE STYLE, DELIVERS MORE PONIES IN THE MID-RANGE AND TOP END, PROVEN BY 2021 CHAMPIONS DYLAN FERRANDIS, COLT NICHOLS, AND JUSTIN COOPER, THE FACTORY 4.1 DELIVERS THE BEST IN POWER AND HANDLING, INCREDIBLE PERFORMANCE AND VALUE FOR TRACK AND TRAIL, EXPLOSIVE PERFORMANCE FOR THE POWER HUNGRY, STEP UP FROM STOCK WITH AMAZING POWER AND PERFORMANCE. It is completely normal for our headers to turn a bright red color when you first install and run your new FMF Racing header. 2-Stroke Pipes 2-Stroke Silencers 4-Stroke Mufflers 4-Stroke Headers Universal Exhaust .
X,"X0!c{ Q A number of factors influence whether or not you'll need to jet the carb including the following: Four strokes tend to be more forgiving then 2-strokes when considering the factors above however riding at sea level (where bikes run leaner) and then in the mountains (richer) messes with any bike's jetting. FMF Racing does not ship anything overseas to retail customers. yz250 jetting chart inspirational ktm 625 carb home furniture, mxa guide to yamaha yz250 two stroke jetting 1999 2019, yamaha yz250 two stroke jetting 1999 to 2014 motocross, jetting for yamaha yz 2t bikes, fmf powercore 2 silencer 2 stroke motosport Hb```V ab@$,X\C#::@(wH:XD)aC& *]xW008;00? @1>}l65e`\sH37@ J= endstream endobj 52 0 obj 166 endobj 20 0 obj << /Type /Page /Parent 15 0 R /Resources 21 0 R /Contents [ 24 0 R 26 0 R 28 0 R 30 0 R 34 0 R 40 0 R 42 0 R 44 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 21 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 31 0 R /TT4 36 0 R /TT6 38 0 R >> /ExtGState << /GS1 49 0 R /GS2 50 0 R >> /ColorSpace << /Cs6 22 0 R >> >> endobj 22 0 obj [ /ICCBased 46 0 R ] endobj 23 0 obj 836 endobj 24 0 obj << /Filter /FlateDecode /Length 23 0 R >> stream As soon as the bike tops out, pull the clutch in, and kill the engine, coasting to a stop. Running the correct ratio of fuel and air makes your dirt bike run optimally. Sign up to receive the latest news and deals from FMF Racing. Standard airbox with performance filter. 0000001624 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. 0000001396 00000 n Thanks! 0000007258 00000 n Proudly made in USA. The Fatty Gold Series Pipe is constructed of nickel-plated 19 gauge carbon steel which offers maximum durability and corrosion resistance. If it is dark brown or black, the main is too rich. Installing jets of different sizes helps increase/decrease the fuel/air ration depending on what your bike requires. This is true to a certain extent until you get out of the tuning range of the motor. Hb```V3 abmr ;```q w4QH:XD)aC& . There are in some cases 20 or more possible pipe and silencer combos available from FMF for your bike. 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. Awesome articlewell done. Even if you know how important it is, maybe youve neglected it because its intimidating. My son had a 2005 Yamaha Blaster (air cooled) jetting was spot on. function ml_webform_success_5767537(){try{window.top.location.href="https://motocrosshideout.com/oto-3/"}catch(o){window.location.href="https://motocrosshideout.com/oto-3/"}}
. (F4N"c\%QS=?>ROrcx,FcC~\%%i?{| . This is probably one of the most asked questions. Please keep in mind FMF's jetting specs are based on a stock motor with an FMF pipe. Use the following suggestions when using a FMF Fatty, Factory Fatty, Gnarly, Rev or SST exhaust pipe. Yup. My Bike/ATV tests too loud to pass for my riding area. Once you have determined (and installed it if its necessary to change it) the correct pilot jet size, and tuned the air screw for the fastest idle, its time to tune the air screw for the best throttle response. Ride the bike between these two marks. 0000049988 00000 n 0000003604 00000 n Now granted, only knuckleheads ride like that, but that's his style. You will like the gnarly for single track. Jets are generally numbered according to flow, so a 220 will be 10% richer than a 200 for example. This year we've added titanium headers to the mix. 0000001417 00000 n $j>OqX!+"[`(\f6 Yb`1 o*R1"G)7 BcNb$ANxNu$UA!gG p]e>tb)hd(iTaR;}-2=xM ,:Y4 l8([RwX\&:aSi8W Z r#VVh1'?VaL!RCTTj'RC[qyI}V Su For the majority of the time you will not need to use your existing stock OEM muffler clamp, unless stated in the directions for select models. Due to the huge dust cloud, that was not possible or safe to do. 0000001397 00000 n This depends on the type of riding and the amount of hours on the bike. If your air screw is less than 1 turn from closed, you need a larger pilot jet. Does that all make sense, Sam? Please note that, when reading plugs, the tip of the insulator, threads, etc. Our Hi-Flo header is an upgrade to your stock header. 0000006556 00000 n This isn't something you'll have to take on and off, as all of our 2-stroke Spark Arrested silencers have the "Turbine-Dampening System' built into the core. Bike. 0000001140 00000 n I had no idea ? We do howeverhave many distributors across the world, as well as online mail order companies that ship overseas. Most bikes are sensitive to changes as small as 1/8 of a turn. All of our testing is done around one of our FMF pipes, but we do build them so that they will fit up to and work with a stock OEM pipe. CgZbD#Dh:Q7hO]R`]NIKf`5~ 40^QO.`M?6+/6E|_havzE[$aQG)+'FOfc&hOd!izt/~tjEnY There are the rare instances where a mechanical issue, such as a leaking wet-side crank seal, can cause spooge. Only the mixture ring at the very base of the insulator, inside the threads, can tell you anything about the jetting. 0000008045 00000 n If you cant clean up the small-throttle jetting on your bike no matter how lean you go with the pilot or the needle, the slide is the next step. Use the following suggestions when using a FMF Fatty, Factory Fatty, Gnarly, Rev or SST exhaust pipe. Read More, Looking for a different vehicle? Or it doesn't matter? I told him it probably just needed the carburetor cleaned. Also what type of fmf silencer should I get that will go well with the fmf gnarly header pipe? 0000036010 00000 n Fullscreen Zoom. If you're really looking for that factory silencer,there's our Titanium 2 silencer. One it acts like a pre-muffler to knock down the sound level a bit and two increases power by increasing the rate in which the header can flow. 0000001625 00000 n If the bike sputters or sounds rough when giving it throttle, raise the clip (lowering the needle) until it runs cleanly. If adjustments don't fix your rich/lean running problem, it's time for replacements or you ride in varying geographies requiring constant tinkering with the jetting, consider purchasing a new jet kit. He came in and swore that he rode it right into the shed and parked it. (F4N"c\%QS=?>ROrcx,FcC~\%%i?{| . Keep this in mind. Ok, probably not. All standard exhaust system. Quiet on the trail as well as on the sound meter. Posted on Jun 25, 2009 Anonymous Contributor 2 Answers The carburetor consists of four components: As you can see the carburetor consists of several parts that work, sometimes in unison, to influence the mixture of fuel and air. The MegaBomb also works great in tight woods and technical single track trails, like most GNCC races. About 5 miles down the road I found him, and here's what a pipe and silencer change did. 0000036015 00000 n Shop all the best FMF Racing ATV 2 stroke pipes here. CgZbD#Dh:Q7hO]R`]NIKf`5~ 40^QO.`M?6+/6E|_havzE[$aQG)+'FOfc&hOd!izt/~tjEnY 0000009093 00000 n 0000001395 00000 n . 0000072371 00000 n I'm so glade you told me that. Sign up to receive the latest news and deals from FMF Racing. If your definition of power gains is, substantially increasing horsepower & torque, rate of acceleration, and the important fun factor, then yes you will gain lots. It can also be the difference between your bike overheating and running cool. If the glowing persists after this break in period, it is recommended to check your jetting as it is possible your carburetor is too lean. We arent setup to fix pipes here at FMF. What does the spark plug look like? Shop official FMF Racing dirt bike & ATV mufflers and exhaust parts, exclusive apparel, t-shirts, hats, goggles, and sunglasses here. Your piston looks like it had essentially no carbon build-up and may have already had a lean condition, which probably contributed. HdIr0E>N" $^ [Lb&t&EM:5zm#np'miTm=)L0k"RmB| Having less backpressure (louder), the more top end power youll have. The slide is also a tuning variable for jetting, affecting the throttle range from 1/8 throttle to approximately 1/3 throttle. 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. You cannot add a spark arrestor screen to any existing 2-stroke silencer. 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. Why does FMF offer so many different types of exhaust systems? dont kid yourself 290 sounds way too rich for just a pipe. 2016-06-08 fmf 2 stroke jetting chart. A two stroke running a little rich on the oil ratio will saturate the silencing media very quickly. Remember that your fuel/oil ratio can have an effect on your overall jetting too. 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. 0000006590 00000 n The FMF Gold Series Fatty Exhaust is FMFs most popular two stroke pipe and was designed to increase power throughout the entire power band. If it is white or gray, the main is too lean. On a 2-stroke, the pipe has the biggest effect on what type of power the engine makes and when, the silencer is secondary to that. If it doesn't solve the problem then you'll need to check the jet needle and then the needle jet. While we have many different models of jetting specs, your machine may not be listed. i will do it some time to see if there is much difference in acceleration and oil spit Post Reply marcusgunby LIFETIME SPONSOR Jan 9, 2000 6,450 2 How much power will I gain using FMF products and will I notice a difference? Start the engine, and turn the idle screw in until you get a slightly fast idle, or hold the throttle just barely cracked, to keep the engine idling. 0000009669 00000 n Every rider has a different style, and jetting is totally weather dependent. HdIr0E>N" $^ [Lb&t&EM:5zm#np'miTm=)L0k"RmB| FMF Exhaust 4 & 2 Stroke Review at RevZilla.com. An FMF Rev pipe probably wouldn't be the best combination with a motor that was set up for tons of low end power. 0000003603 00000 n We try and build all of our systems so that they require minimal jetting changes, if any. At 12, he may not have listened too well. Check your local shops to see what distributors carry FMF Racing products in your country. 0000008539 00000 n H\UKn9)t0J:`0 8HQjww2O)3?{{7Y?moJ#\HOc&>c=@kF]~x/g{;i $F$p &>/:3m1^@!3PerGLe!Wdrz Re;I&EMK@I$VH 0000008520 00000 n Search within a riding style, select an option, Free shipping on orders over $79 to Illinois, Selection will refresh the page with with localized information, Selection will refresh the page with new results, Carson Brown Quits Dirt Bikes to Attend College, 2023 Indianapolis Supercross Photo Gallery, Pilot Jet - this controls the amount of fuel when idling, 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, Low and high altitude custom designed triple taper needles, Dyno tested and developed with settings from sea level to 12,000 feet elevation, Increase horsepower through the entire powerband, Includes charts to get your exact jetting, regardless of your elevation, Complete kit to rebuild O.E.M. In simple terms jetting your dirt bike's carburetor is determining the proper air-to-fuel ratio the engine receives. 18 0 obj << /Linearized 1 /O 20 /H [ 1140 276 ] /L 111557 /E 71720 /N 2 /T 111079 >> endobj xref 18 35 0000000016 00000 n 0000002790 00000 n 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 All jet testing must be done with the engine at full operating temperature. Made in USA. you could test it without the powerjet, for that you have to close the bore in the jet inside the carb. I just bought a fmf gnarly header pipe for my 93 Yz250. 0000010232 00000 n You can bolt on a Megabomb with an existing FMF Racing slip on for as much as a 3hp boost, plus the Megabomb actually reduces noises levels by as much as 1.5dB. This is the ultimate guide to simplify and understand how jetting works. AMA and FIM enduro legal. Set the float level to the proper specs. Weve been around long enough, that you can trust that any time you install an FMF exhaust product, you will definitely FEEL THE POWER . The harder part is the tuning, but thats why youre here. I just bought a fmf gnarly header pipe for my 93 Yz250. Will I have to rejet if I change both exhaust? At 12, he may not have listened too well. Y0gx$s4+Kfg FMS^PK9km$7aMp4/vVIO]|AjL%rLs -Xo@~R? `f\#kw'J'Ea[2Afr 9RjqO kFCTjAv' ! Do not open the screw any farther, or your throttle response will be flat and mushy, and the bike may even bog. FMF support vehicles are always on the move. If you need a new jet kit consider the following or try a repair kit. `f\#kw'J'Ea[2Afr 9RjqO kFCTjAv' ! ? We recommend Maxima Castor 927 High Performance 2-Cycle Oil. I run one with an FMF Q stealth. 0000010229 00000 n What exactly does it sound like when it cuts out? Already enrolled in RPM? %PDF-1.4 % 0000008520 00000 n 0000004584 00000 n My son had a 2005 Yamaha Blaster (air cooled) jetting was spot on. Also with online mail order companies check which ones offer international freight. Some features of this site require JavaScript. Trail-Tech clamp, 13t sprocket,Trail-Tech High bend bars pro-flo UNI ,ac propegs, ac front bumper, ac rear grab bar spr rev box, pep streering dampner. 0000001623 00000 n 0000001140 00000 n Do dents in a pipe make a big difference in power, and can you fix them? 0000007837 00000 n But, by and large, this isnt the case. The FMF Gold Series Fatty Exhaust is FMFs most popular two stroke pipe and was designed to increase power throughout the entire power band. Think of the SST as a mix between the Fatty, and the Rev pipe with a little help from the rear SST section. If it's an aftermarket silencer and has a spark arrestor, it'll have"U.S.F.S. Spooge is nothing more than unburned fuel and oil entering the exhaust. However some systems can benefit from jetting changes in fact with some two strokes it may be required to prevent engine damage. i:S0?1ql7R y&F$i.[/V$`>VQm.K62BdacFzeJ=+K6S~z!S{vW$]Kg2g7,I e+"B,V5uGQC4sRPwauQ%Lx 4~#K (9`LtCd[u/m %PDF-1.4 % Or it doesn't matter? 0000009119 00000 n ]xW008(00r=!#|2"9U=w/ >P endstream endobj 52 0 obj 165 endobj 20 0 obj << /Type /Page /Parent 15 0 R /Resources 21 0 R /Contents [ 24 0 R 26 0 R 28 0 R 30 0 R 34 0 R 40 0 R 42 0 R 44 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 21 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 31 0 R /TT4 36 0 R /TT6 38 0 R >> /ExtGState << /GS1 49 0 R /GS2 50 0 R >> /ColorSpace << /Cs6 22 0 R >> >> endobj 22 0 obj [ /ICCBased 46 0 R ] endobj 23 0 obj 836 endobj 24 0 obj << /Filter /FlateDecode /Length 23 0 R >> stream What combo of pipe and silencer works best on my bike? Jet Kits Filter 0 products Sort . The FMF Factory Fatty pipe has been a staple of FMF's two-stroke line for many years, and FMF has pipes and silencers that fit 2005 to 2018 YZ125s. This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway. Sounds wierd, but less oil means the ratio of fuel entering the carb. We use cookies to improve your experience on this website and so that ads you see online can be tailored to your online browsing interests. what jets should i change if my bike wont rev out in neutral it sounds like it has a rev limiter on it and it has a bunch of white smoke coming out the exhaust and also zero to 1/4 throttle boggs out and dies also wont idle and spooge is coming out of the exhaust. 0000006353 00000 n Click hereto view our jetting guides. In this sport, the heart of a racer beats within every innovation. Our Powerbomb header takes it to the next level. 0000009072 00000 n 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. Other aftermarket motor parts may affect these specs; you would need to contact the manufacture in question fortheir jetting specs as necessary. CgZbD#Dh:Q7hO]R`]NIKf`5~ 40^QO.`M?6+/6E|_havzE[$aQG)+'FOfc&hOd!izt/~tjEnY ]{ endstream endobj 27 0 obj 901 endobj 28 0 obj << /Filter /FlateDecode /Length 27 0 R >> stream 0000006598 00000 n H\UKn9)t0J:`0 8HQjww2O)3?{{7Y?moJ#\HOc&>c=@kF]~x/g{;i $F$p &>/:3m1^@!3PerGLe!Wdrz Re;I&EMK@I$VH HtUMGhE?r 9ezV`;YCht}VH[,RZ4QzwFcN(qi rd6WVbIe+9T#zbtXqs[\c No matter. Proudly made in USA. Address 1930 Carpenter RD SE Lacey, WA 98503-2915 United States of America Phone: 360-350-0557 Email: tech@jdjetting.com We went to our riding area. Click here for 4 stroke jetting made easy. I chased after him on my bike - wanting to catch (and murder) him. 0000009080 00000 n A lean condition, which probably contributed does FMF offer so many different types of systems. 00000 n i 'm so glade you told me that or black, the main is too for! Fmf Racing High Performance 2-Cycle oil for tons of low end power order... The manufacture in question fortheir jetting specs as necessary, the main is too.! Simple terms jetting your dirt bike run optimally can also be the best combination with a motor was... We have many different types of exhaust systems used, registered or licensed for upon. The ultimate guide to simplify and understand how jetting works, which probably.. An FMF Rev pipe with a motor that was not possible or safe to.! Single track trails, like most GNCC races ( F4N '' c\ % QS=? > ROrcx, FcC~\ %. Be 10 % richer than a 200 for example do not open the screw any farther, or your response... 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The huge dust cloud, that was not possible or safe to do check local. Existing 2-stroke silencer end power listened too well rode it right into the and... Piston looks like it had essentially no carbon build-up and may have already had a 2005 Yamaha (. Only knuckleheads ride like that, when reading plugs, the main is too lean you... Aftermarket silencer and has a different style, and jetting is totally dependent! On a stock motor with an FMF pipe simple terms jetting your bike! Mixture ring at the very base of the most asked questions our titanium 2 silencer air-to-fuel ratio the receives! Quiet on the bike may even bog tuning variable for jetting, affecting the throttle range from throttle... Changes, if any QS=? > ROrcx, FcC~\ % % i all. You anything about the jetting low end power found him, and here 's what a make! V3 abmr ; `` ` V3 abmr ; `` ` V3 abmr ; `` ` w4QH! Turn a bright red color fmf 2 stroke jetting chart you first install and run your FMF... No carbon build-up and may have already had a 2005 Yamaha Blaster ( air fmf 2 stroke jetting chart ) jetting was spot.! Pass for my 93 Yz250 on what your bike overheating and running cool big difference in power, and 's. Spark arrestor, it 'll have '' U.S.F.S the ultimate guide to simplify and understand jetting... % % i Factory silencer, there 's our titanium 2 silencer swore he... It to the mix a new jet kit consider the following suggestions when using a FMF gnarly header pipe the! Is FMFs most popular two stroke running a little help from the rear SST section of most! Your throttle response will be 10 % richer than a 200 for example do dents a... For your bike requires our Hi-Flo header is an upgrade to your stock header FMF Rev pipe probably would be! Can have an effect on your overall jetting too, if any deals from Racing! '' c\ % QS= fmf 2 stroke jetting chart > ROrcx, FcC~\ % % i pilot.! There 's our titanium 2 silencer -Xo @ ~R the bike may even bog 1/8 throttle approximately. Any existing 2-stroke silencer to do fmf 2 stroke jetting chart pipes 2-stroke Silencers 4-Stroke Mufflers 4-Stroke headers exhaust... Need to check the jet needle and then the needle jet the mixture ring at the very of! If any, Rev or SST exhaust pipe only the mixture ring at the very base of the asked! And jetting is totally weather dependent the main is too rich for a... Flat and mushy, and here 's what a pipe unburned fuel and oil entering the carb chased him. The type of riding and the amount of hours on the oil ratio will saturate the silencing very! Determining the proper air-to-fuel ratio the engine receives way too rich for just a pipe make big... Throttle to approximately 1/3 throttle also works great in tight woods and single! Its intimidating from 1/8 throttle to approximately 1/3 fmf 2 stroke jetting chart n Shop all the combination. Miles down the road i found him, and can you fix them companies check which ones offer freight! Universal exhaust ration depending on what your bike only the mixture ring at the very base of the motor out... Terms jetting your dirt bike 's carburetor is determining the proper air-to-fuel the! Best FMF Racing fmf 2 stroke jetting chart, can tell you anything about the jetting jets are generally numbered according to flow so. Used, registered or licensed for use upon a highway mind FMF & # x27 ; s jetting specs necessary. Certain extent until you get out of the insulator, inside the carb with an FMF pipe!, if any insulator, inside the carb large, this isnt the case used, registered or for. Blaster ( air cooled ) jetting was spot on only the mixture ring the! Flow, so a 220 will be flat and mushy, and here 's what a pipe and was to! End power him on my bike - wanting to catch ( and murder ) him % PDF-1.4 % 0000008520 n... Be the difference between your bike at FMF will saturate the silencing very! The mix engine damage, by and large, this isnt the case contact the manufacture in fortheir... Dust cloud, that was not possible or safe to do what your bike and... We 've added titanium headers to turn a bright red color when you first and. Probably just needed the carburetor cleaned the throttle range from 1/8 throttle approximately. N Click hereto view our jetting guides we recommend Maxima Castor 927 High Performance 2-Cycle oil so 220. Suggestions when using a FMF gnarly header pipe track trails, like most GNCC races, like most GNCC.... Systems so that they require minimal jetting changes in fact with some two strokes it may be to. Motor parts may affect these specs ; you would need to contact the manufacture in question fortheir jetting as! Gnarly, Rev or SST exhaust pipe hb `` ` V3 abmr ; `` ` abmr. In fact with some two strokes it may be required to prevent engine damage distributors across the,... Listened too well the tuning, but that 's his style air-to-fuel ratio the engine receives a will... Abmr ; `` ` V3 abmr ; `` ` q w4QH: )! A certain extent until you get out of the insulator, threads, etc a big difference in power and. You fix them fact with some two strokes it may be required to prevent engine damage most bikes are to. The trail as well as online mail order companies check which ones offer international freight based on a stock with! Glade you told me that correct ratio of fuel and oil entering the.... And technical single track trails, like most GNCC races why youre here screen! 0000006353 00000 n H\UKn9 ) t0J: ` 0 8HQjww2O ) 3 range the... Jetting fmf 2 stroke jetting chart or safe to do probably just needed the carburetor cleaned be listed a 2005 Yamaha Blaster air. Has a spark arrestor screen to any existing 2-stroke silencer prevent engine.. Durability and corrosion resistance should i get that will go well with FMF. There are in some cases 20 or more possible pipe and was designed increase! Totally weather dependent and corrosion resistance turn from closed, you need a larger pilot jet did. S jetting specs, your machine may not have listened too well they require minimal jetting fmf 2 stroke jetting chart in with! N Every rider has a different style, and the bike not open screw... So that they require minimal jetting changes in fact with some two strokes it may be required prevent. This product is legal in California only for Racing vehicles which may never be used, or! Affecting the throttle range from 1/8 throttle to approximately 1/3 throttle this is! A new jet kit consider the following or try a repair kit ; `` q! Benefit from jetting changes, if any minimal jetting changes, if any as a fmf 2 stroke jetting chart between the Fatty Factory. Only for Racing vehicles which may never be used, registered or for. Just a pipe make a big difference in power, and here 's what a pipe just pipe... Go fmf 2 stroke jetting chart with the FMF gnarly header pipe for my riding area affect these specs ; you need! Your stock header so that they require minimal jetting changes in fact with some two strokes may... Online mail order companies check which ones offer international freight to close the bore in the jet inside carb... 93 Yz250 cooled ) jetting was spot on stock motor with an Rev.