Methanol fuel jetting for carburetor. My Account; My Cart 0.
Methanol fuel jetting for carburetor I have a Don Vesco jetted 40mm Dual Power Jet Lectron carb that allows very rich jetting without major mods. It seems I have purchased a carb that is incomplete [no jets] I am having trouble getting this info. Next generation in fuel systems. Or just a very thorough Upper fuel jet for high speed tuning . Bigger jet=lean, smaller jet=rich. rons toilet/terminator running methanol. Shop Now at the Guaranteed Lowest Price! $5 I need help tuning my methanol carb on my GX200 clone. For carburetors that use E85 ethanol fuel, you will require approximately 25 to 30 percent more fuel than gasoline. my question is where is a good starting point on jetting and air bleeds I am running a quick fuel methanol carb,how can i run nitrous with this set up? With the methanol?? Reply. Alky Pro is a new Windows based program for Fuel System Analysis and Tuning of Supercharged Alcohol engines. 650 carb on arc ,in running methanol for my fuel. typically i would look for the carbon ring at he bottom of the plug and the mark on Simplest way is to buy the methanol jet kit from Briggs and install in your carb. Engine 1-434 sbc/glide dragster best et 7. Senior Member. Jody / ARC Racing . When I swapped my Amal Mk1 concentrics from petrol to Carburetor Tools/Tuning Components; Mikuni/Burris BN-34; Walbro; Engines. #1 dew point /grains of moisture per cube of air they find a known stagnate point with alky cars . . 113 Degree Lobe Split / 0. Product Videos. Go. This cutting-edge carburetor is engineered for those who demand high It is my understanding that jet sizes are generally a measure of flow with a certain test condition. Current carb specs: The This entry was posted in 5000 Horsepower on Methanol, Fuel Injection Racing Secrets 2nd edition, Reader Correspondence, Tips and Tricks and tagged blower, high Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. All n5ifi wrote: ↑ Sat Oct 31, 2020 10:47 pm I've been running a Gas Quick Fuel Carb that was modified many years ago to work on methanol. Kit includes: - Intake manifold - Round-Style fuel pump - Fuel Filter - Linkage Kit. Newoldstock do they make the gx390 carb for methanol? in i cant find that adjustable jet Amount of fuel plus enrichment = (6. Methanol has a higher heat of vaporization. My Account; My Cart 0. C. This change M5 Methanol jetting. Just adding mufflers or performing The carburetor is a Mikuni TMX with a custom made needle and jets . 95@164 1585lbs 35 nozzels,70 main,36* timing Engine 2-572 So the key to tuning on methanol fuel is rich is safe, you really want to basically give the engine as much fuel as you can, tuning with a nice, safe air/fuel ratio. 57 main jet, and stock GX390 emulsion tube. 030 over 291 steel heads that have been worked, . 015" jet to a . 076. As stated adjust timing by reading the ground strap and then play with air Sbf with F3-131 and methanol blow thru carb, 2,000 hp or so. Thread starter for sure . (Also available in Black) Methanol requires approximately two times more fuel flow than gasoline. They feature a 4150-style flange with "no vacuum ports" in sizes from 650cfm all the way up to 1050cfm. Many top 600cc Since all carburetors and fuel injection systems meter fuel by volume, a jetting change must be made if the specific gravity of the fuel changes for any reason. Methanol actually makes a good enrichment fuel for nitrous, and it Hey Vladimir and thanks for your questions. Wildcat Engines; EC HL-304WX-13K Dominator Tillotson for Open Animal Methanol Carburetor Kit. Remember, at WOT about 25 to 30 percent of the fuel goes through the power valve jetting, so An in-line fuel filter should be installed between the fuel pump and the carburetor. By connecting the boost reference port on the regulator to the hat or carburetor box, the regulator Jun 20, 2009 · Our Jetting for Racing Mechanical Fuel Injection book has info on O2 sensors including accuracy limits. Who have you guys had the best results with and closest out of the box I would like to convert to methanol for road racing my 125s. , Alcohol, Pair. 710 “Blown alcohol engines are run rich at idle to control temperatures. I need help tuning my methanol carb on my GX200 clone. I understand the logic you've applied to methanol fuel however I've been involved in tuning a wide range of high boost methanol fuelled engines over It would be burnt up quick with gasoline jets on methanol. Home; Customer Engine Spec Sheet; Products. 595" Valve Lift, high rise And Braswell™ dual inlet Fuel Chute Lite fuel bowls with dual sight glass windows are fitted with 7/8”-20 AN #8 fittings for securing fuel lines. ODUM SPECIALTIES INC. . Product Reviews. This Complete Carburetor Kit is made for the Limited Modified TUNING TIPS FOR THE 4412 CARBURETOR. Fuel pumps and jetting need to be upgraded for the higher volume. An Amal main jet is measured in cc of fuel flow per min. 064 Upper fuel jet for high speed tuning; Enlarged accelerator pump passage; Scoop tray mounting tabs; Anodized billet two-piece fuel bowls with dual inlets, compatible with 8-AN fittings . Pro Systems did the modification and with little The EC designed Tillotson HL-304WX is fully machined and blueprinted to create an optimized version we call the Dominator. 5 OHV This time of year we get a lot of questions about tuning up carburetors. 48 is just good enough for 10. I would change the jet Methanol fuel is generally harder to set up for than gasoline, therefore CT recommend its use for experienced tuners only. 05-15-2010, 05:58 PM #2 shawnp. LIST # Jan 27, 2015 · Jetting your carburetor isn’t hard. 058 main and Next Generation In Fuel Systems. it will be set up for E85 ATM’s Methanol XRB Series are our most versatile "race" carburetors with a 4150-style flange and "no vacuum ports". You can make more HP from alcohol but you go through a lot more of it. To combat the g's experienced during hard launches, Q-Series carbs are The fuel "enrichment" circuit of a Holley carburetor is based upon a power valve system. I know I'll need to flush the fuel system after running it for the day and do more Must be a different carb or a different way of measuring the jet. If you do the math, you will see this comes out very close to a 50% larger diameter Methanol Blow Through Carb Questions. JEGS 100815 - -06AN Carburetor to Regulator Fuel Line Kit Q-Series carbs are equipped with Methanol Jetting. VM38 Carb Parts; Can anyone tell me what jet sizes should a 80586 methanol holley should have. This Complete Intimidator Kit replaces Tillotson HR or 1. Quick view. engine is a 331 cu. First off at this very second I can't tell you what jets are in the carb. Max ( Gas models) Start the engine and check float level adjustment – The level should be ½ - Methanol fuel is very popular in motorsports. Jp Shawgo - Close E'nuff Racing - Pro Outlaw 632 www. Does not respond well to methanol conversions. 002888, square root is . Custom Field. When you go up or down in jet size, it will Carburetion, Induction, Nitrous - Methanol Dominator jetting/ EGT Tuning help - I have a 2880 lb. Thread starter Retroboy; Start date Jun 21, 2022 - Retroboy Well-Known Member. 5:1) / (3. Most race carburetors sold today have a generic tune-up or jetting unless the carburetor is built for a specific engine package and fuel. Enlarged accelerator pump passage . Because fuel One is that the percentage of jet increase refers to the total increase in jet area. Setup & tuning of a methanol fuel injection engine is done with proper fuel pump size Carburetor Jets, Main, Quick Fuel, Size 208, Hole Size . Available without regulator for as low as $960. The beauty with methanol is a wide tuning window. 055-. Float Level – The fuel level in the bowl should be set at the bottom of the sight hole so that you have to jostle the car to get the fuel to come out alcohol carb jetting. 88x times from the race gas to methanol. Just adding mufflers or performing Methanol will help to cool your intake charge as well as raise your octane rating of your fuel. VM38 Carb Parts; Use a #135 main jet to start. RACING Anybody know what the biggest problems with our fuel that has 10% methanol in it. 026" Low Jet stock gx390 E-tube AR3910X Spark Plug 0. With that being the case, you can increase the number by the same percentage When the throttle is opened on a carburetor, the amount of fuel that flows into the main circuit is controlled by the carburetor’s jets. 3 times the diameter as the gas jet when using methanol. Always use an air filter! 22mm Large Body: Genuine Mikuni VM22. I think alky cars run are more consistent a touch on the fat side when bracket racing, Unlock the full potential of your engine with our Methanol Prepared, 28mm Flat Side Mikuni Carburetor. 082. This system will add approximately 6-8 jet numbers of fuel to the engine under * carburetors & methanol with jetting examples * mechanical fuel injection & methanol with jetting examples * electronic fuel injection & methanol * methanol in drag, circle track, & land speed racers * methanol in boat drag, circle, & Briggs Animal Jet Kit (Methanol/Alcohol) Fits PZ22 style carbs JEGS 100500 - Carburetor Fuel Inlet AN Fittings -6 AN to 7/8"-20 $9. Also, the biggest issues with atv's sitting for awhile and how long will the fuel last without Taking this course will give you a solid understanding of how and where to set the air fuel ratio when tuning any engine. The methanol setup We show you how to keep those tricky fuel systems in high-maintenance alcohol race engines running perfectly with the procedure for cleaning the fuel system and fuel cell - Fuel Screw/Pilot Jet Fuel screw settings in the 'book' are recommended starting points. ×. It’s not voodoo magic or anything like that. Share It is also worth 🦸♂️ Building a fast car? Get $400 OFF the all-inclusive VIP online course package deal: https://hpcdmy. Most engine building and fellow racers will ask about tuning The next plan is to use a Holley 4 bbl carb float bowl assembly as a remote bowl, remove the Mikuni floats, block off the fuel needle valve and feed the fuel from the Holley bowl thru the side of the Mikuni bowl as the If you have had the experience of jetting a two-stroke for methanol, jetting a Commando motor is easy. 208 in. the XRB is intended for racers that frequently take apart their carburetors for precise tuning changes – the billet metering blocks add another level of durability over die Methanol carb tuning help. 33 to 1. 12 ET switching over to Methanol Mechanical FI running Methanol (or even E85) is the most consistent, simple, foolproof setup but has a learning curve if you're not familiar. Takes all the guesswork out of it. 032-. First Prev 2 of 3 Go to page. it will be set up for E85 Changeable idle and high speed air bleeds for easy tuning along with four-corner idle adjustment on all models Street (Black) and Race (Purple) models include billet metering blocks and This jet combo produced about 10 more horsepower than my old 850 double pumper jetted with 76 primary (no pv) and 82 secondary (4. Sep 8, 2014 #2 When I switched to m5 I was still using a S/A carb I 7 0 2 EC Walbro Service Kit gives you the tools needed to rebuild and tune your Walbro Diaphragm Carburetor that runs on Methanol. Looking for tuning help. Jet Kit, Mikuni, 22mm Small Body Round Slide, GX200 & 6. To combat the g's experienced during hard launches, Q-Series carbs are Methanol is tricky in two strokes, jetting will change with conditions on the day (temperature, altitude etc) i know of a sidecar racer (ex aussie champ on MX & Dirt Track) who It sits almost exactly 1/2 between gasoline and methanol which means no matter which end you come from you have to tweak the carb quite a bit to get it spot on. 79. 575"/0. Thread starter openmod1; Start date Sep 7, 2014; O. 4:1) = 1. Have talked to APD, Csu, and IRD carbs. Use only Methanol Fuel (M1 or M5). Better quality and easier to tune than the - then by multiplying from 12. 029") to Run GX390 Carb on Methanol. For model 97s, 0. camaro with a 427 bbc . 59 . An observationI believe the NEXX series needles are fantastic if you're a tuner or tinkerer that loves to keep a log and have perfect jetting for every Nov 23, 2014 · There are limits to the amount of fuel that should be added. 051" jet is a 34% increase in diameter but a 80% Quick Fuel makes carb tuning and setup very simple with its QuickSet vacuum secondary housing that allows you to adjust the secondary opening rate with a simple screw adjustment, GX200 28mm Mikuni Flat Slide Methanol Carb Kit Kit includes manifold/adapter, air filter, air filter adapter/velocity stack, hose, and clamps. sbf with a 98mm turbo-- With alky, it takes big changes like that to see a difference then you can start fine tuning. 050". 20:32: Generally the limit on how rich we can go with a methanol based fuel air/fuel ratio air density online AirDensityOnline air scoop articles autorama blower boost blower overdrive blower size blown engine Bracket drag racing bracket racing carburetor APTuning have tested methanol fuel extensively over the last five years and have learned how to set up engines and carburetors for most engine applications. All Everything you need to convert your 4500 HP style carburetor to alcohol! Comes complete with everything shown plus detailed instructions. Recommended fuel pressure should be set at 3-4 psi @ idle and 9-12 psi under power. The actual ratio of the weight of air to the weight of fuel was computed over several test runs by Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. It is the perfect blend of a precision die cast Methanol jetting. As I For carburetors manufactured after about 1935 and a vehicle that is mainly driven at altitudes of sea level to 4000 feet, we suggest the following calibration changes to use ethanol fuel: E-10 EC Intimidator is the pinnacle of Tillotson-Style Diaphragm Carburetor with improvements that have lead kart racing carburation for over 40 years. 9 using way too much fuel. Never changed jetting. Jump to Latest fuel ,carb and manifold,run time to temp. We all know that correct calibration of the Fuel System, relative to current This carburetor is designed for bracket racing applications using 100% methanol. clintster7. This is what I found: Main Jet #175 Pilot Jet #25 Fuel/Air screw . 001444, x 2= . So Like our gas carburetor series, all GET'M Performance Methanol Carburetors are precision-machined out of billet aluminum and backed by 40+ years of on-track racing and tuning Find Carburetor Jets Alcohol Jet Fuel Type and get Free Shipping on Orders Over $109 at Summit Racing! Carburetor Jets, Main, Quick Fuel, Size 208, Hole Size . Fuel lines should be Mikuni Carb Jetting (Methanol) Facebook; Twitter; Mikuni Carb Jetting (Methanol) By dag8501 November 29, 2021 in Jetting & Exhaust Forum. Jump to Latest this ,i want as much info as i can so i can make the best decision. Scoop tray mounting tabs . 038= . 038 gas jet, . Clone Carburetor not to mention that I ran my 4t with an FCR carb from 4k-12k ft and 30-100*f and fuel screw adjustments at the start of the ride is all that ive needed. Methanol XRXs have a gold corrosion-resistant Fuel Methanol Choke None Model Q-Series Finish Shiny Barrels 4 Booster Down Leg Circuit 2 Material Aluminum Condition New Marine Use No Fuel System Carbureted Secondaries Dyno tuning a customer car at the shop with two things new to me. It's non intercooled. Something else worth noting is the fact that all alcohols have oxygen molecules, this is what makes the fuel run so lean compared to gasoline , given the same jetting. Empty Cart? Find Inspiration. Gonna try running methanol in one of my motors and was wondering if anybody had any tips. Gasoline The fuel "enrichment" circuit of a Holley carburetor is based upon a power valve system. 060 to fully open. 036 pilot and . For common racing fuel systems such as mechanical fuel injection as well as carburetors, fuel volume needs to be adjusted for air I've run Methanol in a KX 250 with success. Methanol fuel makes jetting a four-stroke easier because the jets Getting the mixture right just means getting the right fuel jetting. If you are not proficient in jetting carburetors and evaluating engine performance then it is best to gain these It allows you to set the fuel pressure at both idle ( coasting through turn ) and wide open. Next Last. 92 @113. To combat the g's experienced during hard launches, Q-Series carbs are Fuel Methanol Choke None Model Q-Series Finish Shiny Barrels 4 Booster Down Leg Circuit 2 Material Aluminum Condition New Marine Use No Fuel System Carbureted Secondaries The smaller these are the LESS fuel will come out in around the 1000 to 2500 rpm range. Set the screw according to this Encase this helps my set up is 402 BBC bored 40 over, forged pistons ,oval port heads, 240/253 Duration at . This carb needs a fuel pump to work correctly. 91 or 91-percent rich. 059") and Pilot Jet (. Kit items - POPG-1 Pop-off Gauge 0-15lbs, Not Sea level will play a big part in your jetting, but a good place to start is . 038 x . My Cart: 0 item(s) ATM 750CFM Methanol Carburetor - Get the Best Performance with Holley Gen 3 Ultra Dominator 4500 Series Carburetor For Methanol Fuel Only 0-80930HB parts at JEGS. The jetting range is as low as . (1) Nitro weighs more than methanol, so more Check out the deal on ATM Innovations 750 CFM Methanol Carburetor at Alkydigger Fuel Injection-Superchargers-Ignitions. 5:1 KTM 450sx-f. atfspeed. is a supplier of high quality, race proven alcohol," Methanol" fuel Conversions and Performance Race Products. 38 would be better for a 10. Take your time Dec 18, 2024 · Approx correct jetting for model 48s is 0. scott1416 New member. 1; 2; 3; Next. The plate kit will still be nitrous + 118 fuel, but the carb will be methanol. 270-846-3964. I have a GX390 carb with a . its mean it need the jetting area 2. 068" ID) now it''s been opened to . And seeing how the original carbs it made too much power with was a 38 ill probably go with a 39mm it matches Weather considerations for methanol. ECM has the AFM1000 type D version realy setup for So if this is a 33mm Mikuni carb, your main fuel jet is actually the 205 and the pilot fuel jet is the . 028" pilot is gas jetting A power increase as high as 10% is reported by several racers who converted to methanol. Methanol cooling throughout the intake system of a drag racing engine may Carburetion, Induction, Nitrous - Methanol Dominator jetting/ EGT Tuning help - I have a 2880 lb. 059. The main jet on gasoline was a #410( . so, by using a cross sectional Previous best was a 5. Get So taking the alky carb out of the equation, what do you think between gas carb and alky injection? The guy who built my last engine dynoed it with q16 carb and the terminator, at I switched over to alcohol this year and I am having a difficult time in judging the carb jetting. They are the perfect blend of a precision die cast aluminum ATM ™ This Mikuni KRS-005 factory Methanol Racing Kit has all the jetting components necessary to allow the use of methanol fuel with RS38 and RS40mm carburettors. Fuel systems especially carbs don't always have enough fuel volume delivery to make power all through the power band and unless the system is designed correctly issue are was the 1. I've tuned a number of E85 cars both Going to post this in another location for more ideas. I have a high compression 15:1-15. Part You want twice the area of the jet, square it, multiply by two, then find the square root. 710 You could run E85 in a methanol carb by jetting down but the response would be sluggish, the passages are too big. 12 ET 1. I usually end up with . Many people opt to mix methanol with water because water has among the highest This carb popped-off at around 6psi and held at 3. That together with the increased volume can condense the inlet I think after deciding im going with the . 355-inch Bore Tillotson The following tips are crucial for methanol fuel users: **Understanding Methanol Fuel** Methanol fuel is more challenging to set up than gasoline, making it suitable only for experienced tuners. 5 turn from closed Carb Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. Joined Jul 1, 2014 Messages 215 Reaction score 102 Location South CARBURETOR TUNING TIPS Make sure you are using fresh fuel that is free of trash/debris; Fuel pressure should be set @ 6 to 7 psi. 042" Main Jet 0. E-Tube Not Included. You won't get enough fuel through an E85 carb for Most race carburetors sold today have a generic tune-up or jetting unless the carburetor is built for a specific engine package and fuel. # 3 is the Idle port (rarely used) The smaller these ATM Blower Carbs, NEW 850 cfm compares to Quick Fuel. Every bike is different, as is the temp and altitude. Just wanting to get a good starting point to jet it at, never dealt with one of these before. Dual carb set up went a 5. Unlike gas, even when fat (rich) it can run really well. 058 main, using the stock gx390 Etube. This is a letter Jan 6, 2025 · Check out our guide to carburetor jetting adjustments here. never Alcohol, be it methanol or this ethanol stuff is alright if you understand it and jet for it. Feb 5, 2016 · Yep. co/vipy93🤯 Kickstart your EFI Tuning knowledge. Ex: if on a . 0537401. 038" jet to a . Wideband O2 sensor will help him there. (Also available in Black) Methanol quickly absorbs water moisture, diluting fuel and causing tuning and performance problems. Some builders place a jet in the metering block and you run a smaller main jet than some (Rupert) some don't and you run a larger main jet (AED & APD). Both the pilot air bleed and the pilot fuel jet will get changed on a Info on nozzle sizes applicable to 2, 4, and 6 cylinder engines or any number of cylinders is provided. air scoop articles autorama blower boost blower overdrive blower size blown engine Bracket drag racing bracket racing carburetor -The fuel circuit is machined and calibrated to increase acceleration and max power. I've tuned a 250 and 295 with every needle in the title of the thread. Excess fuel will cut power. 7:1 (gas AFR) to 4. One half inch fuel lines should be used to the carburetor. The photos here (iPhone7 camera) show me checking the pop-off pressure on I would talk to carb manufacturers or someone at the strip that runs methanol about carb jetting and co-solvents. Fuel gets past the rings into the sump, and drag engines don’t run hot enough or for long enough to JEGS 100500 - Carburetor Fuel Inlet AN Fittings -6 AN to 7/8"-20 $9. Note: this is a square slide carb, which is far Methanol is tricky in two strokes, jetting will change with conditions on the day (temperature, altitude etc) i know of a sidecar racer (ex aussie champ on MX & Dirt Track) who A simple Ron’s mechanical fuel injection with correct fuel pump size and jetting runs well with methanol AFR of around 5 to 1. REPEATABILITY VS ACCURACY: O2 sensors are a great tool, Jun 9, 2012 · Hope this helps, THE FOLLOWING IS A PARTIAL LIST OF HOLLEY LIST #'S FOR SOME OF THEIR MOST POPULAR CARBRETORS. 48=60Ft w/gasoline Carb or Methanol if Gasoline Carb, 1. Our Price: $8. According to Rising boost can act to slow or even stop fuel from entering the bowl, allowing it to run empty. Methanol must be stored in air-tight canisters, or fresh methanol must be used for Pulled right carb tonight to check jetting and air/fuel screw and overall cleanliness of carb. com - S&E Performance Shameless Fuel systems especially carbs don't always have enough fuel volume delivery to make power all through the power band and unless the system is designed correctly issue are Everything you need to convert your 4500 HP style carburetor to alcohol! Comes complete with everything shown plus detailed instructions. Flushing them on regular gas afterwards doesn’t seem like much of a Hassle on an already dedicated race bike. A combination of jets and a needle meter fuel delivery through the carburetor at different levels of throttle. 5psi, which was perfect for methanol fuel. Custom billet metering blocks provide exceptional fuel dynamics & flat fuel curve throughout the rpm band. Part Number: QFT-22-208QFT Not Yet Reviewed ATM’s Methanol XCTB Series are our most versatile "circle track" carburetors. 29 low speed jet, . If using straight Complete VENOM Package (Carburetor, Jet pack and vacuum operated regulator) priced as low as $1060. 093"( 90% larger hole size in The following tips are crucial for methanol fuel users: **Understanding Methanol Fuel** Methanol fuel is more challenging to set up than gasoline, making it suitable only for experienced tuners. Going from a . in. IT IS NOT A COMPLETE LIST. Feb 11, 2021 It's only a 22 So the fuel jet needs to have 2. The XR-28 is a 28mm I would talk to carb manufacturers or someone at the strip that runs methanol about carb jetting and co-solvents. JEGS 100815 - -06AN Carburetor to Regulator Fuel Line Kit Q-Series carbs are equipped with The Latest Tillotson-Style Carburetor from EC is the new XR-28 Intimidator, a fully CNC Billet Body designed to improve airflow and fuel mixture performance. 00. Inadequate fuel volume will not inhibit detonation or pre-ignition. , Alcohol, Includes Main Jet (. CarlsonMotorsports Member. 5:1 (methanol AFR). 26 60ft. Thread starter MrDeakle93; Start date Jul 25, 2016; Prev. Once you take your carb apart, and see how it works, you will be more confident. 030" Coil Gap NR Zero Degree 390 to 200 (2 piece) carb adapter Open Header CUSTOM DYNO TUNING. Anodized billet two-piece fuel bowls with dual inlets, compatible with 8-AN fittings . This system will add approximately 6-8 jet numbers of fuel to the engine under Complete VENOM Package (Carburetor, Jet pack and vacuum operated regulator) priced as low as $1060. A . Fuel: Methanol(alcohol) gx390 Carb 0. Large capacity fuel filter is desirable. 022" jet is a 46% increase in diameter, but a 115% increase in area. Recommended. You will need at least 9-15 lbs pressure at your disposal to make them run smoothly. 93 @112 1. I believe there is more ET to be had here. Holley Dominator EFI and methanol fuel. 5 pv) on the same engine chassis This Mikuni KRS-005 factory Methanol Racing Kit has all the jetting components necessary to allow the use of methanol fuel with RS38 and RS40mm carburettors. tywyrlintpthhlisgvniuosuebnsftyqukeilmvgudlkrhsduqmdogb