Oct 10, 2012 · In Carb Tuning Tips, Part 1, we provided a brief overview of the carburetor, including some basic carburetor anatomy. In Part 2, Demon Carburetion helps us identify a few more chief components of the modular, square-bore carburetor, acquaint you with common problems that can arise, and tell you how to prevent them. Basic Carb Function Harley CV Carburetor Mixture Tuning Notice: All instructions and the EZ-Just are intended for a Harley CV carburetor only. Mixture tuning on your Harley Davidson CV carburetor is a simple procedure that can easily be performed with basic tools. Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture.

Apr 10, 2008 · I have absolutely no experience with carburetors, and no idea what size jets to use after 1200 conversion, keeping my 883 heads, and installing cycle shack (not drag, muffled) exhaust pipes. I have asked this question before, and someone told me I should buy a S&S super e carburetor. $400 is a bit steep to spend on something that I already have and works fine. I already ordered a 1.70mm main ... Jul 28, 2005 · Mikuni Tuning for Harley-Davidsons for the Mikuni round-slide VM type carburetor. Want more performance from your Harley-Davidson Knucklehead, Panhead, 45, or U-Series? Already have a Mikuni carburetor, but don't know how to adjust it? Doesn't run "right" and won't respond to the changes you've made? Mar 15, 2018 · Since American Iron Garage readers work on their own bikes, we felt a How-To on CV carb jetting was in order for owners with CV carb-equipped bikes. Of course, the carb’s jet needle, be it adjustable or fixed, can also be a factor in proper tuning, so we’ll cover messing with the jet needle in the next issue (AIG #318). .

The idle system is a separate carburetor built into the main body. There are appropriate connecting passages, a replaceable jet, and an adjustment screw. The screw controls the air/fuel mixture at dead idle. The jet controls mixture as the throttle begins to open. By about 10 percent throttle, the idle system is delivering all the fuel it can.

Hey I have a ? For you, I just bought a new Mikuni Carb for a 1340 evo, install was easy but before I even started the bike I turned on the gas and gas started coming from the overflow, do you have any idea why this would happen? Sorry if I posted in the wrong spot haven't quite figured out the site yet, thanks Rob.... Mar 06, 2009 · Can anyone recommend jet sizes (low & high speed) for my stock CV carb. I have ‘96 Road King that has a K&N filter upgrade, Andrews EV27 cam, Vance & Hines slip ons and a SE 8,000 limit ignition module. I’m wanting to upgrade the stock carb but not sure which jet sizes to use.

So, as an example, Number 7 in the drawing, is article "(7) Pump Jet for Dellorto DHLA carburetors" on this page here. Furthermore, you can use the buttons below to quickly access a "short-list" of most-frequently required parts, like jets, needle valves, gaskets and service kits, for this carburetor. Aug 14, 2010 · I just moved to NM, about 5000' elevation. Bike was sluggish. I was told to rejet the carb. HD put 165 main jet and 40 pilotjet. Carb was "burping" every 10 seconds. I took it back and they said i needed new intake gaskets, which they installed. Carb still burps when i throttle back and in 3rd @ about 2700 rpm.

Jul 28, 2005 · Mikuni Tuning for Harley-Davidsons for the Mikuni round-slide VM type carburetor. Want more performance from your Harley-Davidson Knucklehead, Panhead, 45, or U-Series? Already have a Mikuni carburetor, but don't know how to adjust it? Doesn't run "right" and won't respond to the changes you've made? pull the slide up and the slide helps to keep the velocity across the main jet constant. The SnS carbs need the most venturi as they need it to pull fuel out of the main jet over a broader range of flows since there isn’t any slide. So how do you size a carb? Most carb manufacturers like to use the exit diameter of the carb for sizing. Keihin Part No/Size Dimensions N424-27-SIZE 7mm Slot head Harley-Davidson® CVH (CV Type) carburetor. 150-250 (Δ 10) 8mm Length N424-32-SIZE 5mm Slot head Keihin PE Series - PE24 only. The carb basics are the same for any carb whether it’s a Holley, Q Jet, Edelbrock or just a 1 bbl on a six cylinder. Start with the idle circuit because it runs continuously. If it is running rich, then all other fixes are just crutch fixes around that problem. Then cruise jetting, then full throttle, then solve any hesitation off idle.

Jul 28, 2005 · Mikuni Tuning for Harley-Davidsons for the Mikuni round-slide VM type carburetor. Want more performance from your Harley-Davidson Knucklehead, Panhead, 45, or U-Series? Already have a Mikuni carburetor, but don't know how to adjust it? Doesn't run "right" and won't respond to the changes you've made?

Carburetor Jetting Troubleshooting. Carburetor troubleshooting is simple once the basic principles are known. The first step is to find where the engine is running poorly, fig 7. It must be remembered that carburetor jetting is determined by the throttle position, not engine speed. If the engine is having troubles at low rpm (idle to 1/4 ... Carburetor Tuning - Carburetor tuning will be most effective when power/dyno feedback is available. Dealers with dyno facilities can assist with tuning. It is wise to monitor air/fuel ratios when engine/carburetor tuning. Changing Jets: Main Jet: This can be changed either with the fuel bowl installed or off the car-buretor. Access this jet by the carburetor meters out fuel according to airflow and pressure changes in the carb’s bore, while keeping air velocity (and fuel atomization) reasonably consistent. So the CV carb does a better job of dispensing gas closer to what will burn efficiently (assuming the jetting is properly sorted out). The CV carb even compensates for Carburetor Tuning - Carburetor tuning will be most effective when power/dyno feedback is available. Dealers with dyno facilities can assist with tuning. It is wise to monitor air/fuel ratios when engine/carburetor tuning. Changing Jets: Main Jet: This can be changed either with the fuel bowl installed or off the car-buretor. Access this jet by Mikuni Jetting Chart for H-D ... Single carb. Air jet 0.7, Slide 2.0 ...

Hey I have a ? For you, I just bought a new Mikuni Carb for a 1340 evo, install was easy but before I even started the bike I turned on the gas and gas started coming from the overflow, do you have any idea why this would happen? Sorry if I posted in the wrong spot haven't quite figured out the site yet, thanks Rob.... The carburetor on a motorcycle has an air/fuel mixture screw to adjust the amount of air going to the engine. 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. Likewise, if you change elevations by more than 1,000 feet you should adjust the ... Jan 11, 2019 · 2000 Duece, stock cv carb. The fuel is being pulled through the main jet at idle, fouling the plugs. Took the carb apart, cleaned all the passages with carb cleaner and compressed air, set the float according to the manual, replaced the o rings, all the things you're supposed to do.

Lectron is celebrating 45 years of helping riders get the most from their vehicles with our high performance carburetors and EFI. Thanks for your support! Keihin Part No/Size Dimensions N424-27-SIZE 7mm Slot head Harley-Davidson® CVH (CV Type) carburetor. 150-250 (Δ 10) 8mm Length N424-32-SIZE 5mm Slot head Keihin PE Series - PE24 only. Shop the best Harley-Davidson Sportster Carburetor Jets & Needles for your motorcycle at J&P Cycles. Get free shipping, 4% cashback and 10% off select brands with a Gold Club membership, plus free everyday tech support on aftermarket Harley-Davidson Sportster Carburetor Jets & Needles & motorcycle parts. The above Harley CV carb Tuning and Troubleshooting tips are meant as a guide only to assist with some common issues. Please visit our support forum for post-purchase support of our products. When in doubt consult your factory service manual and/or a professional motorcycle technician. Harley CV Carburetor reference diagram Apr 14, 2015 · Choosing the Right Power Valve for Your Holley Carburetor April 14, 2015 Randy Bolig Drag Race 101 , General Engine , Guest Columns , How-To and Tech Tips , Tech 5 When it comes to tuning a Holley carburetor the power valve has always seemed a mystery to many.

This Mikuni HSR carburetor kit is designed to be a bolt-on application, and as such, is set-up and jetted properly for most applications. However, since Harley-Davidson motors are often highly modified, alternate tuning settings may be required. The Mikuni Tuning Manual helps make jetting alterations and adjustments an easy matter. Aug 14, 2010 · I just moved to NM, about 5000' elevation. Bike was sluggish. I was told to rejet the carb. HD put 165 main jet and 40 pilotjet. Carb was "burping" every 10 seconds. I took it back and they said i needed new intake gaskets, which they installed. Carb still burps when i throttle back and in 3rd @ about 2700 rpm. - Installing a 6Sigma Jet Kit in your carb is the best way to get the maximu m performance and longest life out of your ride. - 6 Sigma Jet Kits are the only custom engineered je t kits produced. Each individual design is based on your year, model, altitude and modifications. What does a 6Sigma Jet Kit do? The stock carburetor from the factory ...

On many Mikuni carbs, the main jet is either attached to or sharing the same chamber as the needle jet. One more thing about the needle. These jet needles are available in many sizes to fine tune fuel flow. The are available in both single taper and double taper with a wide variety of sizes available for most carbs (see the chart below). Shop the best Harley-Davidson Sportster Carburetor Jets & Needles for your motorcycle at J&P Cycles. Get free shipping, 4% cashback and 10% off select brands with a Gold Club membership, plus free everyday tech support on aftermarket Harley-Davidson Sportster Carburetor Jets & Needles & motorcycle parts.

I have for the most part stock TC88, I do have Andrews 21 cams, slip on's and a stage one air cleaner. I have a tuning question, I got a great deal on a used 42 the guy went with a 45 sold me his 42 for $150. I took the carb up to my Harley mechanic, he checked it out and adjusted the...

Hey I have a ? For you, I just bought a new Mikuni Carb for a 1340 evo, install was easy but before I even started the bike I turned on the gas and gas started coming from the overflow, do you have any idea why this would happen? Sorry if I posted in the wrong spot haven't quite figured out the site yet, thanks Rob.... Mar 06, 2009 · Can anyone recommend jet sizes (low & high speed) for my stock CV carb. I have ‘96 Road King that has a K&N filter upgrade, Andrews EV27 cam, Vance & Hines slip ons and a SE 8,000 limit ignition module. I’m wanting to upgrade the stock carb but not sure which jet sizes to use. 2002, 2003 Parts Catalogs show a Cali 883R carb but no jet sizes or other carb parts. Listed same year 883 (Cali) data. 65) 1999, 2000 Parts Catalogs do not list part number for a (Cali) main jet size for the 1200S. Listed same year (Dom) jet sizes. 66) 1999, 2000 Parts Catalog does not list part number for a (Cali) main jet size for the 883C.

Nov 22, 2011 · Bruce and Aaron show you step by step how to jet and tune your S&S Super E or G carburetor and put it on the Dyno to show the results. Carb tuning and carb jetting made easy! Carburetor Tuning Range Chart: Keihin Needle Chart with Small Needle Tip Notation: Suzuki DRZ400S BSR Carburetor: FCR-MX Carburetor Parts: Eploded View 1: Eploded View 2: Carburetor Clamps and Fittings: FCR1 Single Carburetor Parts: Accelerator Pump Diaphragm Spacer in Jet Kit JDK015, JDK013, and JDK002: Needle Clip Positions for FCR carburetor ... Harley CV Carburetor Mixture Tuning Notice: All instructions and the EZ-Just are intended for a Harley CV carburetor only. Mixture tuning on your Harley Davidson CV carburetor is a simple procedure that can easily be performed with basic tools. Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture.

Jan 05, 2015 · I am a PHD tech and have found that in almost ALL cases that using the stock carb that Twin Cams respond very well to a 205 or 210 main jet and deliver better mileage that the factory jetting. I agree with the 48 slow jet or even a 50 if you live in a cooler climate. PART NUMBER PICTURE DIMENSIONS AND FEATURES SIZES 4/042-SIZE 6mm Hex 1BA Thread 11.5mm Length 5.0mm Thread length 50-200 (Δ 5) 210-500 (Δ 10) 520-720 (Δ 20) H5-N151067-A-SIZE Special Order M5x0.8 ThreadØ3.8mm Slot Head14mm Length Plain, unbeaded nose Ø3.8mm 30-65 (Δ 5) M10/14-SIZE 6mm Hex 1BA Thread 8.0mm Length 5.0mm Thread length 50-200 (Δ 5) N100604-SIZE… Read More »

#42-402 Carb Kit, 45 Mik fits Ultima 100/107 and 113 CI engines #42-403 Carb Kit, 45 Mik fits Ultima 120 and 127 CI engines. ULTIMA HSR 48MM. The 48 mm Mikuni is the current King of Performance Carb’s for all out street performance an any engine with head work or larger cubic inch engines when maximum potential is desired. The CVP Rejet kit is designed for unmodified Harley CV carburetors and riders seeking to "Jet it and Forget it". Cures the lean condition common when upgrading to an aftermarket air cleaner or a mild slip-on mufflers. Includes the correct size pilot... :chopper: I have a Mikuni HSR 42 fitted to my 2003 FXD Twin Cam the engine has been bored to 95'' (1550cc) has Andrews TW27 cams, the heads have been ported, flowed and cc'd to street port plus spec with big valves to match the cams, compression ratio is 9.5:1 corrected, the Mikuni HSR42 carb has 162.5 main jet on a JOST powertube (jet extender ...

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Mar 10, 2010 · Found this info and though it may be useful. I was thinking a .036 was too big for my 107 but I was wrong. S&S Super E (1 7/8" Carburetor) Initial Jetting Settings Engine Size 74-86 CID S&S Super E Idle Mixture 1 1/4 To 1 3/4 Turns S&S Super E Intermediate Jet .028 To .033 S&S Super E... Mar 10, 2010 · Found this info and though it may be useful. I was thinking a .036 was too big for my 107 but I was wrong. S&S Super E (1 7/8" Carburetor) Initial Jetting Settings Engine Size 74-86 CID S&S Super E Idle Mixture 1 1/4 To 1 3/4 Turns S&S Super E Intermediate Jet .028 To .033 S&S Super E...

Oct 10, 2012 · In Carb Tuning Tips, Part 1, we provided a brief overview of the carburetor, including some basic carburetor anatomy. In Part 2, Demon Carburetion helps us identify a few more chief components of the modular, square-bore carburetor, acquaint you with common problems that can arise, and tell you how to prevent them. Basic Carb Function the carburetor meters out fuel according to airflow and pressure changes in the carb’s bore, while keeping air velocity (and fuel atomization) reasonably consistent. So the CV carb does a better job of dispensing gas closer to what will burn efficiently (assuming the jetting is properly sorted out). The CV carb even compensates for we now offer carburetor rebuild service for keihin fcr & fcr mx carbs. please call us for information and quote. (see contact info bottom of website) **the world's foremost source of off-road motorcycle fuel and carburetor tuning systems**

Aug 14, 2010 · I just moved to NM, about 5000' elevation. Bike was sluggish. I was told to rejet the carb. HD put 165 main jet and 40 pilotjet. Carb was "burping" every 10 seconds. I took it back and they said i needed new intake gaskets, which they installed. Carb still burps when i throttle back and in 3rd @ about 2700 rpm.

This calculator will show you the requirement at WOT, or at the maximum RPM entered, if your Engine is capable of turning 8000 RPM but you shift at 5800 then use the shift point not the max RPM. Big Stall Convertors, huge gears and very light cars are not part of the Calculation and a competent Carburetor Professional should be consulted.

This is also true of all road-going bikes sold in America for the last quarter century. However – and this is important – at idle and above ¼-throttle the jetting is pretty good. Harley's Keihin CV (constant velocity) carburetor is based on the basic Amal slide carb design from the early post-World War I era.

Anyone have a chart for jet number to drill size? I figured I'd try and drill out the jets I have since they're too small anyway. Any advice on how to do this properly? Another question...I took my carb to the Harley shop and asked for jets. Apparently, there are two different sizes of main jets for a Harley Keihin carb. The thread sizes are ... Don't you just love jetting your carb? In fact, jetting your dirt bike is probably one of the most, if not the most dreaded part of maintenance. Unfortunately, it's not something to deal with later and keep putting off. Racers especially need to stay on top of the fuel/air ratio entering their dirt bike's carburetor to ensure optimum performance.

This calculator will show you the requirement at WOT, or at the maximum RPM entered, if your Engine is capable of turning 8000 RPM but you shift at 5800 then use the shift point not the max RPM. Big Stall Convertors, huge gears and very light cars are not part of the Calculation and a competent Carburetor Professional should be consulted.

The carb basics are the same for any carb whether it’s a Holley, Q Jet, Edelbrock or just a 1 bbl on a six cylinder. Start with the idle circuit because it runs continuously. If it is running rich, then all other fixes are just crutch fixes around that problem. Then cruise jetting, then full throttle, then solve any hesitation off idle. Nov 22, 2011 · Bruce and Aaron show you step by step how to jet and tune your S&S Super E or G carburetor and put it on the Dyno to show the results. Carb tuning and carb jetting made easy! - Installing a 6Sigma Jet Kit in your carb is the best way to get the maximu m performance and longest life out of your ride. - 6 Sigma Jet Kits are the only custom engineered je t kits produced. Each individual design is based on your year, model, altitude and modifications. What does a 6Sigma Jet Kit do? The stock carburetor from the factory ... .

2002, 2003 Parts Catalogs show a Cali 883R carb but no jet sizes or other carb parts. Listed same year 883 (Cali) data. 65) 1999, 2000 Parts Catalogs do not list part number for a (Cali) main jet size for the 1200S. Listed same year (Dom) jet sizes. 66) 1999, 2000 Parts Catalog does not list part number for a (Cali) main jet size for the 883C. Instructions & Guides. Get installation instructions, tuning tips, videos, and how-to guides for your Harley CV carburetor and other CV Performance brand parts. For additional product support of CVP products please visit our Support Forum. Please consult your factory service manual or a qualified technician when working on your motorcycle.