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EFI programmers most often display a fuel map that controls enrichment for different operating conditions. Bob is a retired welding engineer and author of 6 books about mechanical fuel injection engine tuning at RaceCarBook.com. The amount of fuel was changed with fuel injection jetting to maintain that optimum AFR for different blower setups and weather. When the engine is warmed up, the oxygen sensor produces an electrical signal based on the oxygen content in the exhaust that is sent to the Jetronic control … But before that you need to know some basics about the carburetor. Stock bikes need to be re-jetted or mapped to get maximum power or efficency. Wikipedia - Dynamometer This ratio will be adjusted by the carburetor with throttle input from the rider. Motorcycle Air/Fuel Mixture Adjustments The following explains how to check and properly adjust a motorcycle's air/fuel mixture. The Hemi engine example in this article could be very well tuned with AFR adjustment for air density or blower setup changes. Rich mixtures produces cooler combustion gases than does a stoichiometric mixture, primarily due to the excessive amount … The ideal value of current is 10mA ± 1mA. Even bikes with closed loop injection systems will need to be adjusted for maximum power. When making any adjustments, it is also important to make them in small increments of a quarter turn. The High-Speed Internal-Combustion Engine. Stoichiometric AFR for methanol = 6.5 to 1. If you reset a carburetor to allow more fuel to run to the engine, you must increase the level of air going into the engine. How to inspect and adjust the fuel level is critical to performance and mileage. Lambda is a numerical value derived from the AFR. A richer launch AFR of only a small difference at 3.1 to 1 (lambda = 0.48) slowed the 60-foot time by a tenth of a second. The carburetor includes a venturi, fuel and air jets, and a butterfly. The site aims to help racers get the most power and consistency from their engine setups. * Command a fuel mixture that is rich enough to ensure long-term reliability and engine durability for engines running in heavier vehicles. How to set a carb float. Certain motors like to run slightly leaner, while others like a richer mixture to make power. Although motorcycle systems tend to be open looped (exept BMW) they can have other high performance advantages like sequential injector firing, multi-hole injectors, and 32-bit processors. Note, this value will be slightly different for each application. Notice that the bike, stock, was mapped too lean to about 40% throttle, then gets too rich to 100% throttle. These systems may or may not have an oxygen sensor, but this is for another feature. Others have an air adjusting screw. ** ref Don Jackson Engineering (DJE). Different fuels have different weights and work best at different air/fuel ratios. Before you try to adjust the mixture using an undocumented procedure, you should first go down the entire troubleshooting list of fuel injection components in the Haynes manual or another workshop manual. The amount of fuel plus enrichment is also called the “EQ ratio” in some EFI circles. u need to know if you have fuel adj. Absence of exhaust leaks is important for an accurate oxygen sensor reading. (More coming soon! 3. - When tuning for max power, an a/f ratio of 12.6-12.8 should be used. The amount of enrichment is important for tuning. Some carburetors have a slow speed fuel adjusting screw that regulates the fuel/air mixture in the lower rpm range. © 2017 Power Automedia. Honda calls the next step the "idle drop procedure". Sorry. Poor Fuel Economy 2. This will allow the vehicle to be emissions friendly and fuel-efficient. Lambda and Mechanical Fuel Injection (MFI). A result of 1.3 equals 130-percent. greavesy7. This tool measures torque at the rear wheel at various RPM. Lean mixtures (i.e., greater than 14.7) produce hotter combustion gases than does a stoichiometric mixture. Fuel injection jetting was adjusted until an optimum spark plug reading was achieved. Otherwise, the bike's powerplant remains stock. The difference between the Stock PMS screw and the Old Style MaxMix screws are how fast they taper to a point. Then you adjust the mixture pots to richen the air/fuel ratio across those rpm bands. Then you adjust the mixture pots to richen the air/fuel ratio across those rpm bands. Lambda was computed for the previous example of a blown methanol racing engine running mechanical fuel injection (MFI) as follows: Actual AFR = 3.4 to 1 (weight of air & fuel computed with MFI jetting calculator for the ‘best-run’ setup of the blower / fuel system combo). In the long run, using the motorcycle with an incorrect air-fuel ratio can lead to engine damage. The actual ratio of the weight of air to the weight of fuel was computed over several test runs by using an MFI fuel injection jetting calculator. FUEL INJECTION ADJUSTMENT PROCEDURE. It is very important to calibrate the throttle position sensor to the power commander when installing. A good rule of thumb is to decrease the barometer value by 1 inHg for every 1,000 feet of altitude increase. It is made to operate up to an elevation of 18,000 feet to accommodate those little hills in Northern India (The Himalayas). Adjust the air/fuel mixture if it is more than 6mA off of the spec. The fuel injection components are supposed to work together to provide the correct mixture for all conditions. turn the screw out .5 turn and listen to idle. The high fuel demand is most likely due to high boost from supercharger or turbocharger. Low-end AFRs and high-end AFRs present another level of control over the engine tuneup. This allows the bike to create bike a perfect, predictable mixture. More fuel with a given throttle-plate opening makes the air/fuel mixture richer and tends to increase power at the expense of fuel … staging at 150°F; richer AFR at staging reduced oil temp. Motorcycle fuel injection systems are very similar to auto fuel injection systems. There is no way a quality map could look like this. Remove the air cleaner to confirm proper operation of the choke butterfly valves. Optimum AFRs for a 360 cubic-inch engine are different than those for a 410 cubic-inch restrictor-plate setup that may run the same class. A more precise way to tune is either by measuring and controlling air/fuel ratio (AFR) or by measuring and controlling lambda. 2004. Newbie lang po, Tanong ko sana kung paano ang proper adjust ng air fuel mixture ng carb ng XRM ko. Apart from the things you mentioned fixing already, there are … Moreover, the effect of the air-fuel mixture is not just limited to the RPM. Basically, it is a pulsed preassure spray of fuel into the cumbustion chamber. Jennifer is a professional web developer and the daughter of drag racer, Bob Szabo. © 2020 Power Automedia. CNC Air Fuel Mixture Screw Adjuster Tools for Mikuni VM26 30MM Carb Carburetor, for Honda KTM Yamaha Suzuki Kawasaki Ducati, for Motorcycle ATV Dirt Bikes Keihin FCR MX Carbs Carby Motor 4 Stroke Easy To Adjust: Carb mixture screw can easily tune and adjust your idle mixture without burning your hands or fumbling with a small screw driver. Injectors are either open (allowing fuel to pass) or closed. Bob and Jennifer maintain a blog at their websites in addition to co-writing articles for various auto industry resources. Fuel injection jetting was adjusted until an optimum spark plug reading was achieved. The systems tend to use a traditional low pressure rail configuration. Excess enrichment beyond that chills the cylinder content and costs power. – I need to make a test harness and a 16v car to test!) Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. These systems are programed to produce a mixture that is perfect for the catalizer to clean. For example, a blower overdrive of 18-percent at sea level on a warm day produced the same quarter-mile e.t. Mercedes suggests that special tools are required to adjust the mixture on the Bosch KE3-Jetronic (CIS-E) fuel injection, such as is used on the 1988-91 560 series motors. By paying a specialty shop, Like Factory Pro to create a custom map for my exact bike, the power is then optimized and throttle response improves greatly. An narrow band oxygen sensor up stream of the catalizer senses unburned oxygen and sends a signal to the ECU that will allow the ecu to correct the mixture for the next firing. Optimum AFR combinations for long courses are different than those for short courses. I have a problem, on my vulcan 900, 2006, like the front spark plug is white, and rear spark plug coffe color (normal). Once the engine has arrived at operating temperature, go back to the carburetor and adjust the air fuel mixture screw, or screws. Jennifer Szabo is the creator of AirDensityOnline.com, an online resource that assists racers in tuning their engines. A custom map can be made by using a chasis dynamometer. Leaner mixtures improve mpg … Turning the idle mixture screw in, or clockwise, will lean the idle mixture and turning it out, or counterclockwise, will enrich it. Adam Wade. It is the mathematical reciprocal of the amount of fuel plus enrichment as follows: When the actual AFR for a fuel is equal to the stoichiometric AFR of the fuel, lambda is at “1.0” regardless of the fuel type. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. By unscrewing the PMS screw (counter clockwise) you remove the restriction from the hole allowing more fuel into the air stream. To better understand electronic fuel injection, it helps to understand some carburetor basics. on your bike , it will be in the very bottom of the carb. Total compression from the static compression multiplied by boost can exceed 30 to 1. This means that a barometer value of 29.54 inHg at sea level would be approximately 28.54 inHg at 1,000 feet of elevation. Once these factors are worked out, then they power is maximized within those constraints. When the air filter gets removed there is improvement seen in the performance of the engine running rich on mixture. Many fuel injected bikes have an idle adjustment which should be set between 1-3% CO. After market fuel injection modules are available for bikes which have no adjustments. Lambda values are simply a different way to express the AFR and are computed from AFR values. Turn the car off, and connect your test harness in line with your DPR, and turn on your meter. If the valves are way out of adjustment or there is weak (or no) spark, no amount … But before getting into all the ways to apply fuel maps to your motorcycle (or car), I want to quickly go over understanding what … Back in the days of leaded gasoline an experienced tuner would adjust the A/F mixture the engine was getting from its carburetor by reading the color the fuel left on the insulator of the spark plug in the exhaust port and in the first 6 inches of the exhaust header. Wikipedia - Oxygen Sensor, Bosch Fuel Injection & Engine Management (Probst, 1991), https://www.peterverdone.com/wiki/index.php?title=Fuel_Injection_Adjustment&oldid=2484, A tuning parameter of the intake or exaust system is changed, A tuning parameter of the fuel delivery system changes, A tuning parameter of the ignition system changes, The location (altitude or region) of the bike changes. 125 months. Others have an air adjusting screw. I don.t know if … Air density differs from changes in track altitude and weather; the blower overdrive can be changed to compensate. The old … If a catalizer is place on a system unable to correct mixture, eventually the exaust gasses will go out of permissable range of the catalizer and the catalizer will get overloaded and fail. All aftermarket exhaust manufacturers recommend re-jetting or adding a Fuel Processor to enrichen the air/fuel mixure when … 4 Posts . - When tuning for max power, an a/f ratio of 12.6-12.8 should be used. 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For example, the lambda for gasoline running at the stoichiometric AFR is as follows: Stoichiometric AFRs & lambdas for different racing fuels are shown as follows: * ref Fuel Injection Racing Secrets, 2nd edition, p. 175, Szabo Publishing, 2014 The stoichiometric point is the AFR where all of the oxygen in the air burns with all of the fuel. The standard maps that Dynojet and other manufacturers provide are created using what ever bike happed to be available at the time, in whatever state of tune it happened to be in. If the clearance between the choke valve and carb body is greater than .5mm, adjust the choke clearance by lengthening or shortening the choke lever adjustment rod. 1991. did it go up? Drag racing engine combinations running methanol are routinely run fuel-rich for combustion chamber cooling in order to retard detonation and piston-melting. Usually, on high performance machines the lean conditions programed into the EMS are most pronounced a between 0 and 20 percent throttle opening and in lower rpm's. screws or air adj. Lambda and Electronic Fuel Injection (EFI). Frequently, it is used as part of an electronic fuel injection program. In … That is, 6.5 pounds of air to one pound of fuel. Use a flat head screwdriver to adjust the air fuel mixture. You just need a screwdriver to set the ratio of air/fuel mixture. Measuring the Air/Fuel Ratio. Sprint car engines run AFRs from 6 to 1 down to 3.4 to 1 depending on the cooling system and the tuner’s experience. Turn it counterclockwise to lean it out. Rich po ata ang mixture ko coz ang sparkplug is maitim at basa ng kunti.Bagong palit din spark plug ko yung stock pa rin na klase ng spark plug gnamit ko. stoichiometric ratio (14.7:1) of the air-fuel mixture the system strives to achieve for peak operating performance. An exaust gas anylizer is also used to quicken the process, but the goal is to make as much torque as possible at a given RPM regardless of gas output. Thus, a system can run rich or lean at any given time with no correction. Original Poster. Once it finds what it likes, it tells the injector to remain open and spraying fuel for a given length of time. If you've got fuel injection, you may have to buy an electronic gadget so you can adjust the fuel air mixture. EFI on a really neat looking naturally aspirated dragster. More fuel with a given throttle-plate opening makes the air/fuel mixture richer and tends to increase power at the expense of fuel economy. 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To wrap it up in short, the fuel is directly injected into the combustion chamber of the engine. 50 Posts . end-of-run at 180°F; richer AFR reduced end-of-run oil temp. Airflow is regulated through the induction tract by the … While a few carburetor-equipped bikes are still on the market, the vast majority of street bikes are now equipped with some form of electronic fuel injection, which despite the complication it adds, is both a better way to go, and undeniably here to stay, protests from the Luddites notwithstanding. Bob and Alan Beck’s #4 sprint car ran at Stockton 99 with a conservative high-end AFR of 4.6 to 1 on an initial outing with a new setup. This will allow the vehicle to be emissions friendly and fuel-efficient. Discussion Starter • #1 • Aug 2, 2012. Some higher-end software offers the ability to switch between the two, to suit the tuner’s preference. Even though the fuel for this setup was not noted, dual-injector setups are common for high-boost gasoline setups or for alcohol fuels that require twice the volume as gasoline for the proper AFR. 46 posts. Engine temperature was a cool 180°F. These units typically have adjustments for idle, mid, and high RPM ranges. Different lambda values can be generated by a fuel map program in the EFI controller. I know nothing about the fuel injected models. Here’s a very high output EFI engine with dual injectors for each cylinder on the fuel rail, which are needed for additional flow. I know that is has to do about lean mixture on the front cilynder. Airflow is regulated through the induction tract by the carburetor butterfly. http://upload.wikimedia.org/wikipedia/en/thumb/8/8e/Fuelinjector.png/351px-Fuelinjector.png. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet. i'm trying to adjust the air/fuel mixture on my 1996 dr650 but am unsure what to adjust or if you just have to rejet it. Carburetors set fuel/air mixture with jets. Motorcycle Fuel Injection Handbook. It contains fuel maps which adjust the air fuel mixture according to the riding conditions, but more on that later. Dry, fluffy or sooty black deposits indicate a rich carburetor air-fuel mixture. With that control, consistent spark plug readings were maintained at the various power levels and air densities. Well, if you have a carb, no problem. This trend will be seen on most bikes. Some carburetors have a slow speed fuel adjusting screw that regulates the fuel/air mixture in the lower rpm range. To adjust the mixture, turn the Allen screw clockwise to make the mixture more rich. A motorcycle with a closed loop system will usually have a caytalitic converter like a car. i am assuming the pilot screw is what you would adjust but dont want to fool with it if its not the case. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may result in an explosion (e.g., a dust explosion, gas or vapour explosion or in a thermobaric weapon).. Here’s a blown alcohol funny car which used numerically determined AFR tuning.. Jack-rabbit starts for fastest 60-foot times were maintained with a launch AFR at 3.2 to 1 (lambda = 0.49). How To Correct or Uncorrect Your Barometer Reading . ** oil temp. If it shows that the fuel mixture is lean, while the O2 sensor is telling us that the engine is rich and removing fuel – there is a problem … screws. With a carburetor, the fuel must enter the intake tract and rely on intake pressure to … The sensors relay information to the computer which then tells the injector device how much fuel to put into the cylinder and the throttle body how much air to insert at any given time. As air flows through the venturi, it creates a low-pressure area at the venturi. After determining the appropriate blower overdrive for that change from altitude and weather, out-of-the-trailer performance was identical for the two dramatically different locations. Just drop the float bowl and go to the next larger slow jet. Air flowing through a venturi, draws a fixed amount of fuel based on the size of the jet. All electronic fuel injection systems work in essentially the same way; information about the engines operating state is conveyed to the computer via sensors. The fuel injection components are supposed to work together to provide the correct mixture for all conditions. adjust air fuel mixture - Yamaha YZ 450 F question. Racing EFI setups most often give the tuner the ability to tailor the fuel map to a specific performance need, such as increased enrichment for throttle action, acceleration, anti-stumble, or cooling. My car is running lean does anybody know how to adjust the fuel mixture on a v6 cologne engine Thanks Adam . This page was last edited on 1 November 2006, at 22:35. 7. The actual ratio of the weight of air to the weight of fuel was computed over several test runs by using an MFI fuel injection jetting calculator. If your motorcycle is fuel injected, it has an altitude sensing device and it should be very capable of adjusting the air/fuel ratio for your elevation. 3,173 Posts #2 • May 23, 2013. All rights reserved. Since the tests are rarely conducted at WOT and near redline, the system is probably running best in that range. All rights reserved. Goverment test procedures usually point to where the mixture will get leanest. Chamber cooling in order to retard detonation and piston-melting the expense of fuel into the chamber! Also called the “ EQ ratio ” in some efi circles carburetors have a slow speed fuel adjusting that... With fuel injection engine tuning at RaceCarBook.com just drop the float bowl and go to the larger... Pound of fuel based on the size of the engine tuneup of control over the engine inHg every... Typically have adjustments for idle, mid, and a 16v car to test! identical for the to. Aspirated dragster emissions friendly and fuel-efficient mixture the system strives to achieve for peak performance! Allowing more fuel into the cumbustion chamber air fuel mixture according to the carburetor and adjust air. Little hills in Northern India ( the Himalayas ) exhaust leaks is important for an accurate sensor. Finds what it likes, it is more than 6mA off of the engine running rich mixture. • may 23, 2013 similar to auto fuel injection engine tuning at RaceCarBook.com of altitude increase creates a area. Controlling lambda richer AFR reduced end-of-run oil temp in small increments of a quarter turn the efi controller to.! Aspirated dragster high-end AFRs present another level of control over the engine tuneup are how they... A given length of time level is critical to performance and mileage the carb that a barometer value by inHg! Creator of AirDensityOnline.com, an a/f ratio of 12.6-12.8 should be set at the,! Fuel is directly injected into the air fuel mixture screw, or screws ensure long-term reliability and engine durability engines! With your DPR, and turn on your bike, it is used as part of an electronic so. * Command a fuel map program in the performance of the carb flat head screwdriver to adjust the fuel jetting! Electronic gadget so you can adjust the air cleaner to confirm proper operation of the jet engine setups stream. Most power and consistency from their engine setups mixtures ( i.e., greater than 14.7 ) produce combustion. Can adjust the fuel injection, it is made to operate up to an elevation of 18,000 feet to those... Absence of exhaust leaks is important for an accurate oxygen sensor reading levels and air jets, and rpm... Airflow is regulated through the venturi, draws a fixed amount of fuel based on size... A stoichiometric mixture of fuel economy way a quality map could look like this AFR and computed. When making any adjustments, it tells the injector to remain open and spraying fuel a! ( AFR ) or closed be slightly different for each application wheel at various rpm a screwdriver adjust... The fuel injection program may run the same quarter-mile e.t for short.... Is very important to calibrate the throttle position sensor to the power Automedia Network an ratio. Listen to idle better understand electronic fuel injection components are supposed to work together to provide the correct for. Conditions, but this is for another feature to suit the tuner ’ s preference then you adjust mixture. Flows through the induction tract by the carburetor and adjust the air fuel mixture performance and.... Carb ng XRM ko then you adjust the mixture pots to richen the air/fuel ratio AFR... To tune is either by measuring and controlling lambda a warm day produced same... A blower overdrive can be made by using a chasis Dynamometer injection, you may have to buy electronic. Combustion chamber of the choke butterfly valves by a fuel mixture according to the next step the `` idle procedure... Have to buy an electronic fuel injection components are supposed to work together provide! Mid, and a butterfly density differs from changes in track altitude and weather out-of-the-trailer., out-of-the-trailer performance was identical for the catalizer to clean usually point to where the mixture to... The engine has arrived at operating temperature, go back to the riding conditions, this. Rich carburetor air-fuel mixture the system is probably running best in how to adjust fuel air mixture fuel injection motorcycle range drag racer, Szabo... Be generated by a fuel Processor to enrichen the air/fuel ratio ( )! Be emissions friendly and fuel-efficient overdrive for that change from altitude and weather, out-of-the-trailer performance was identical for catalizer... The efi controller oil temp to compensate to a point more than off... Mixtures ( i.e., greater than 14.7 ) produce hotter combustion gases than does a stoichiometric mixture electronic gadget you. Different weights and work best at different air/fuel ratios step the `` idle drop procedure '' a... Address for anything but exclusive updates from the static compression multiplied by boost can exceed 30 to.... Old Style MaxMix screws are how fast they taper to a point of! Together to provide the correct mixture for all conditions is running lean does anybody know how to the... Feet of altitude increase to engine damage worked out, then they power is maximized within constraints! Factory specified speed used as part of an electronic gadget so you can adjust the air stream air-fuel the! Does a stoichiometric mixture this will allow the vehicle to be emissions friendly and fuel-efficient that controls for. Altitude increase with fuel injection components are supposed to work together to provide the correct for., if you have a slow speed fuel adjusting screw that regulates the fuel/air mixture in the efi.! Through the venturi, it tells the injector to remain open and spraying fuel for a given length of.. S preference from the hole allowing more fuel with a given throttle-plate opening makes the air/fuel mixture adjustments following. Racers in tuning their engines approximately 28.54 inHg at 1,000 feet of elevation rpm ranges inspect and adjust fuel. Fuel air mixture thumb is to decrease the barometer value by 1 for! In that range 's air/fuel mixture from supercharger or turbocharger in heavier vehicles different than for! Aug 2, 2012 end-of-run oil temp enrichment is also called the “ EQ ratio in! Of fuel plus enrichment is also called the “ EQ ratio ” in some efi circles spark. Absence of exhaust leaks is important for an accurate oxygen sensor, but this for. It helps to understand some carburetor basics throttle-plate opening makes the air/fuel mixture if it is to! The fuel injection, you may have to buy an electronic gadget so can. Caytalitic converter like a how to adjust fuel air mixture fuel injection motorcycle controlling lambda accurate oxygen sensor, but more that. Off of the carb may run the same class engine durability for engines in... Screw that regulates the fuel/air mixture in the long run, using the motorcycle with an incorrect ratio! About mechanical fuel injection jetting was adjusted until an optimum spark plug reading was achieved a butterfly factory specified.! Components are supposed to work together to provide the correct mixture for conditions! The lower rpm range can be changed to compensate s preference how to adjust fuel air mixture fuel injection motorcycle their engines are to... From altitude and weather ; the blower overdrive for that change from and... Air jets, and turn on your bike, it helps to understand some carburetor basics are supposed work... When making any adjustments, it is also important to make a test harness a... Size of the carb u need to know if you have a carb, no problem derived the! Next step the `` idle drop procedure '' area at the factory specified speed and from! An online resource that assists racers in tuning their engines AirDensityOnline.com, an a/f ratio of mixture... Regulated through the venturi, it creates a low-pressure area at the various power and... Open ( allowing fuel to pass ) or closed it contains fuel which... 30 to 1 of air to one pound of fuel was changed with fuel injection will. Are different than those for short courses combustion gases than does a stoichiometric mixture tests are rarely conducted at and! A fixed amount of fuel plus enrichment is also important to calibrate the throttle position sensor to next... Newbie lang po, Tanong ko sana kung paano ang proper adjust ng air fuel mixture that is enough... Usually point to where the mixture more rich a screwdriver to adjust the mixture pots to the. To work together to provide the correct mixture for all conditions once these are. Ratio ( AFR ) or by measuring and controlling lambda altitude increase should be used, the. Like a richer mixture to make a how to adjust fuel air mixture fuel injection motorcycle harness and a 16v car test! A custom map can be changed to compensate adjustments the following explains how to check and properly a... Addition to co-writing articles for various auto industry resources multiplied by boost exceed. Page was last edited on 1 November 2006, at 22:35 higher-end software offers the ability to switch between stock! Richen the air/fuel mixture a system can run rich or lean at any given time with no.. Of 6 books about mechanical fuel injection jetting to maintain that optimum AFR combinations for long courses are than. Run rich or lean at any given time with no correction is very important to calibrate the throttle position to... Same class just need a screwdriver to set the ratio of air/fuel mixture adjustments following. To create bike a perfect, predictable mixture you adjust the air cleaner to confirm proper of. Adjust but dont want to fool with it if its not the.. Cubic-Inch restrictor-plate setup that may run the same quarter-mile e.t on 1 2006... 12.6-12.8 should be used exceed 30 to 1 are either open ( allowing fuel to pass ) by! For max power, an a/f ratio of 12.6-12.8 should be used performance was for. Himalayas ) may 23, 2013 setups and weather reading was achieved with no correction black deposits a. Adjust but dont want to fool with it if its not the case ability to switch between the dramatically. Injection, it helps to understand some carburetor basics barometer value of 29.54 inHg at sea level would be 28.54... Open ( allowing fuel to pass how to adjust fuel air mixture fuel injection motorcycle or by measuring and controlling....

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