How does a keihin fcr carb work.
Nov 23, 2014 · Ok,thanks fellas for your replies.
How does a keihin fcr carb work. Another possibility would be a Keihin from a Honda SL350; but finding a 40 year old carb worthy of using would probably be a challenge not May 29, 2023 · Kipa brand is a reputable china replica fcr 39, but it is not a direct fit into a DRZ as is. Mar 9, 2013 · Fascinating, the Keihin FCR! As a mechanical engineer who has done his fair share of design and testing and manufacturing, my hat's off to the engineers at Keihin who did the work to pull off the FCR. keihin is a subsidiary of Honda Motor Corp and their 2-stroke and 4-stroke carbs are state Sep 6, 2024 · Rebuilding a carburetor can also be very confusing with all the little parts and gaskets. And here's the Chinese knock off: Keihin FCR Parts Diagram Detailed Overview and Breakdown For optimal performance, it is crucial to understand the specific configuration of carburetor elements. I noticed while installing it that it was different from the fcr MX carb thats in the write up here on thumpertalk. Find out why the engine won't start, runs rough, or perhaps hesitates on acceleration. Apr 1, 2014 · there are lots and lots of carburetors out there. May 16, 2007 · Edelbrock carb isn't worth it. I'm trying to decide which way to go. Feb 12, 2022 · Here's a great deal about it. Even tho this Teikei carb is doing fine (at the moment-lol),I am going to continue searching for an alternative,if nothing more than a traditional Mikuni round slide (with the proper bleed type needle jet body inside). The following is a guideline for jetting Keihin carburetors. Oct 13, 2011 · the only fcr the i know that plugs right in (tps plug that is ) is the crf 250. i think they changed the plug to the same as the 450 around 07. This guide will give you a the basic understanding on how the Keihin carburetor fuel circuits work. Match your carburetor number to be sure. KEIHIN FCR / FCR-MX / CR SPECIAL / PWK / PWK-S / PJ / PWM / PE ULTRASONIC CARBURETOR CLEANING & REBUILD SERVICE OEM CARBURETOR PARTS / GASKET KITS CUSTOM KEIHIN FCR SETS FOR ENGINES NOT LISTED CUSTOM MADE KEIHIN FCR SHAFTS Oct 20, 2008 · its just a very good flat slide Keihin carb. 57" (39. Without using the hotstart, it's a pain to get started again (no decomp on the cams, and high compression piston). On some carbs this can be done without unracking the carburetors, on others they must be unracked. Mar 23, 2007 · The CDI can work in a 2d mode (TPS unplugged), but power and responsiveness will be degraded. note the importance of the Pilot Air (jet or screw) for carrying the fuel. May 10, 2014 · Has any one been using the Keihin 35mm FCRs? How do they work? They are very expensive. Perform the jetting in the order given below. If you find an FCR w/o a removable one, then it will not work. has over a pumper, that maybe your riding area, hasn't allowed you to experience. Following are some of the new features that take motocross and ATV performance to the next level: Over-flow drain and May 16, 2024 · Hi All, I found a set of the keihin fcr39 carbs for the Thunderbird. if some one has a conversion list to keihin I would like to see it . 2000 xr650r most riding closer to sea level elevation looking for any install tips/kits but more importantly the correct jets and settings and where to get the jet /carb kit. . I hope it is of value Let's be honest, who actually knows how to jet a carb? Exactly, very few until today!In this video you'll understand everything there is to know about jet Apr 13, 2017 · I finally found a deal on an FCR 41 carb for the XR650R. The MAJ isn't the same, it isn't a carrier, it bleeds into the Sep 7, 2011 · for the last time, the keihin carb or FCR is a stock yamaha carb and its already been stated numerous times that the only difference from a honda fcr to a yamaha fcr is one is bigger then the other by only one mm. If you look at the TT kit, you can piece together the pieces as that's what i've done. Throttle response is much quicker and it hits harder, too. This practically frictionless design allows for much lighter throttle return springs and a finer degree of power control for Nov 23, 2014 · Ok,thanks fellas for your replies. Keihin carburetor number along with associated carburetor kit. Feb 3, 2025 · The Keihin Carburetor Manual PDF is a valuable resource for professionals and enthusiasts, offering detailed guidance on troubleshooting, maintenance, and tuning for optimal performance and safety. Sudco makes a intake bell that goes between the carb and your S/SM model intake boot. Features include a flatslide throttle operating on roller bearings with progressive linkage for smooth operation and control. Jul 24, 2007 · To get big time power, you start with Keihin FCR 41mm carbs, a better exhaust system, and eventually bigger pistons and head work. The BST40 measured 1. Contents of the Honda Accelerator In this episode of Roma Custom we will examine the difference between a Keihin CV carburettor and a flat valve carburetor, in my case a Mikuni HSR 42. Zero throttle operation - (idle circuit) idle screw: depending on your type of riding adjust the minimum idle speed to desired rpm making sure the engine is up to operating temperature Explore the Keihin carburetor parts diagram, highlighting key components and their functions for better understanding and maintenance of your carburetor system. In order to work correctly, the carb must be gunk free, and not worn out (eg: leaky seals). First, do not be tempted to separate the main body of the carb (the midbody). Kawasaki KX450F KX250FY May 6, 2008 · I run a hotstart button (FCR, carb mounted) on the SM bike. We break down the rebuild process of a Keihin FCR Carb and how to adjust your Accelerator pump. How does a mechanical slide and a Keihin FCR carb work? This is an overlooked question, but a lot of people still don't know how these master pieces work. S. Now, Keihin has developed an FCR carburetor for the ultimate off road performance upgrade. Note how the MJ influences right down to idle. Just to repeat my guide; get the needle right for midrange using the needle clip. On FCR carbs the main jet, slow jet, jet needle, air adjustment, slow jet air adjustment and gas valve are different and located elsewhere. As such, you can find out a lot about the aircut system and what it does by reading my article. something else this carb showed me was the the bore of the Nov 30, 2021 · Totally agree with the performance advantage of the FCR over a CV carb. However, they work opposite. A more complete description is found in my article, Keihin Idle Circuits White Paper. If in doubt, install a fresh carb kit to ensure everything is sealing up correctly. 1mm) in diameter at its tightest point. These settings are for Here's a step-by-step how to on installing the Honda Updated Accelerator Pump Kit. FCR single CARB EXPLODED VIEW - Jets R Us Keihin jets FCR carb carburetors and parts Aug 17, 2007 · Re: Carbs by Mouse » Wed Aug 05, 2015 4:24 pm There seems to be a few Carb options for the CBX. Thanks! Complete overhaul of a Keihin FCR carburetor off of a 2007 Honda CRF450R. Aug 26, 2014 · My question: What is the easiest FCR39 carb to plug into and jet for the LTZ400? With all the different FCR carbs floating around out there, how do I identify the right one? Which ones should I stay away from? What bike would the right FCR 39 come off of? I know Curtis Sparks offers a plug and play kit but $500 is way out of my price range. So I ordered this carb off ebay. 878mm) in diameter at its tightest point. Free shipping to the U. Mar 10, 2013 · there are lots and lots of carburetors out there. This will be similar to all model using the Keihin FCR carb. I'm looking at buying this carburetor second hand, and the seller doesn't know the exact model. Eddie Cisneros is a carb guru on TT and he has posts that have all the answers. I believe mine to be the non MX version. the bog can be easily taken care of with simple jetting changes, ziptie mod, changing the leak Keihin FCR (Flatslide CR) Racing Carburetors Following in their tradition of high technology and performance, Keihin’s latest carburetor design for racing is the FCR designed for downdraft engine design use. If I do need to rebuild it, what parts wear and would need to be replaced? Aug 20, 2024 · Hi all. It looks to have all of the options available on a FCR other than the on-carb hot start plunger. The bike has a factory exhaust and as far as I can tell the airbox is standard but the snorkel has been removed (in pictures). The FCR-MX carburetor has been specially designed with the needs of the off-road rider in mind. Jul 29, 2011 · In the past few weeks I have been gathering parts and preparing for my FCR 39 install. Aug 26, 2006 · So appears carb body is good, but jets,slide not marked. From drag bikes, waterc Tusk Carburetor Mid-Body Gasket Kit: https://rmatvmc. Jun 5, 2022 · The Keihin carburetor is a well-built carburetor that offers good performance and reliability. After m To eliminate popping on decel. I tested the Keihin Carb Air Fuel Screw and it's a game changer for precise tuning. Not anymore! It won't work in any carb but the 2008 year carb, and only if it came off of the 2008 450 R or X. Quote Log in I compared the internal dimensions of the BST40 carb and my 2006 WR250 FCR-MX and looked for the point of tightest restriction inside the carb bore and got out the mics and calipers to compare. Don't buy the wrong kit. 【summary】 CBX1000 AUTHORIZED KEIHIN DISTRIBUTOR AND THE #1 ONLINE SHOP SINCE 2001 FOR GENUINE KEIHIN CARBURETORS MADE IN JAPAN. 180-day warranty! Feb 25, 2008 · The best part is this works on all years of the Kehein FCR carb, is a simple, no brainer, minimal talent required just change the diaphragm, ignore a couple other pieces that comes with it and a bargain at under $20. This is the Sep 15, 2016 · Setting up the FCR 39 - stupid questions abound Seriously I have read so much about these things, adjustable screws, leaks, mains, needles, jet needles, needle jets, slows, airs, w-t-f?!? The vernacular is inconsistent at best unless I'm totally missing something. The part that really sucks about FCR carburetors is that they come with primary type emulsion tubes as opposed to the bleed type emulsion tubes every other four stroke carb in the whole universe ever used. Jan 10, 2006 · Does anyone make a basic idiot's guide to the Keihin FCR carb? I've seen the tutorials on jetting in the referance section, but I'm really looking for a book I can go out and buy that goes through the basic function of the unit, adjustment as well as jetting. Thanks for your help! The newest version of the Keihin FCR Dirt Bike Carb, which offers many fine-tuning options, updates, and performance upgrades. lower 48 states. 5hrs by ferry) and find a carb expert there but not sure if it's worth the hassle. To be clear, it's the section of the carburetor that's slanted in the second picture you have. Sep 18, 2007 · A 41mm is over carb 'd for this bike's needs IMO. Say goodbye to engine hesitation. Special Applications 33/35/37/39/41 Oct 10, 2009 · progress , Now that I have the FCRs installed and running tops: first step is understanding how FCR chokes work there is an air passage (venturi The modern high performance four-stroke engine is, for the most part, strapped with using carburetors, albeit the incredible Keihin FCR unit, which until now has played a dominant role in the evolution of the modern ’stroke dirt bike. Jan 17, 2011 · Jetting, basic FCR carb and jet location pictures Jump to Latest 98K views 43 replies 27 participants last post by sketty20 Sep 6, 2016 husker525 Discussion starter Explore the detailed diagram of Keihin carburetor parts. AUTHORIZED KEIHIN DISTRIBUTOR AND THE #1 ONLINE SHOP SINCE 2001 FOR GENUINE KEIHIN CARBURETORS MADE IN JAPAN. When I look on Mar 6, 2005 · In a nutshell, and without telling me what I should do or should not do and who won World War II, what do I need as far as parts and work to update my 01 FE501e from a Dellorto to a Keihin FCR 41 carb. Choosing a Carburetor Based on Looks How does it compare to fuel injection? For FCR Beginners: Which Racing Carburetor is Best to Start With? Which is better, the Keihin FCR carburetor or the CRS carburetor? Of course, the FCR carburetor. If you are still having trouble with your carburetor post a question and we will try to help you. I know the green cams and aftermarket ignitor is the way Nov 9, 2010 · The removable intake bell / vstack / bellsmouth is the part that goes between the carb and the airbox boot. May 25, 2017 · The fuel screw bleeds down how much fuel mixes with the air coming from the carb’s bypass hole. Thanks! So Ive got a Drz400e with a keihn fcr39 carb, I’ve recently cleaned the carb, installed an aftermarket fuel screw and am looking for some advice as to the tuning procedure, everything is running ok just want to get it to where it should be as it hasn’t been tuned since the jetting kit was installed by the previous owner who was definitely not a mechanic/experienced From what I’ve read Feb 14, 2022 · Should I still take the chance on the FCR and jet them "on the road" or do you think my current CR-S will work well with the 904 once re-jetted to suit ? My other option is to travel to Sicily (about 1. Carburetors are jetted using stock motorcycles and watercrafts. With this knowledge you should be able to tune the Keihin carburetor correctly and tackle common adjustment issues. They have a tps and the flow really well and have great throttle response and are effiecient in the way the deliver fuel, its just the most popualar 4 stroke carb for all around use, period. it does not seam to be listed by keihin . Pop the button back in and take off. We have Complete Keihin FCR Carbs parts & upgrades in stock. Although my work is based around the 37-41mm Keihin FCR carb. link/tusk-carbureto Hey guys, I picked up a Keihin FCR carb today in trade for some stuff and it came with a rebuild kit, but I need some help identifying it and I need to know if it is going to work on my 14 s model. That's it. The Tusk Carburetor Mid-Body Gasket Kit has everything needed to rebuild the mid section of a Keihin that is most overlooked during rebuild. I recently ordered and installed a fcr 39mm carb on my 06 DRZ. Defeating looks different for each type. Here is a link to an excellent pictorial guide on how to refresh your FCR carb before you go and try to adjust a tired out old carb. Some are simple plunger valves, others employ trap doors. What size jets are those of you running on your fcr carbs? To start, I’ll be using the stock blue cams. I guess it's possible someone got thei hand on some cheese ball OEM Sep 4, 2014 · It most certainly does, and the combination of the spring Keihin chose acting along with the pump and the resistance to fluid flow inherent in the carb's design ensures that this is true. This is the same for all Japanese 4-stroke with Keihin FCR-MX Carburetor. The carburetor is easy to tune and offers a good range of adjustment. To my knowledge its the older slant body FCR. 2 years later Did you happen look at the OP's link where they purchased the carb? Can you post a link to a reputable dealer selling brand new OEM style carburetors for $257 USD brand new like the carburetor above? Not doubting you , just stating my observation based on brand new FCR's purchased from reputable sellers , such as Thumpertalk. Or simply do it during a carburetor rebuild. All Keihin carburetors are pre-jetted for bolt-on operation. The aircut system is actually integral to the idle circuit, the most complex circuit in any 70s-80s Keihin carburetor. The 39mm carb will provide superior low to mid range velocity over the 41mm carb. Jun 2, 2023 · Of course, the FCR carburetor. There is a lot of information on this Oct 5, 2011 · The R&D Racing Power Bowl 2 is a complete replacement float bowl and accelerator pump (with an adjustable leak jet) that refines the fuel flow on Keihin FCR carburetors. com, as a reference aid only, to tune Keihin PE and PKW 28 carburetor as commonly used on 4-stroke mini bikes. 50" (38. Then the carb should be jetted to perform using member Taffy's method to get the best performance out of it possible starting with a "D" or "C" series needle. The 37mm FCR measured 1. These have an accelerator pump fitted which helps to control any low end bog that might come with a hamfisted operator who is want to whack open the throttle. 5mm. Smoothbore venturi for maximum air flow. How about someone with a lot of knowledge do a comparison of the options with pro's and cons for the technical library? Or is there one and l just don't see it? The carb is a Keihin FCR of some sort (pics below). The newest version of the Keihin FCR Honda XR400R Carb, which offers many fine-tuning options, updates, and performance upgrades. Of my stock carb are smaller than what I”m seeing on the Chinese keihin”s, I”ll keep researching, it will be a while before I actually need to fit a carb. The JS flatslide PWKs are cheaper. The following is nothing more than a technique, procedure, steps or whatever you want to call it to help identify and isolate the carburetor circuit involved. Jetting Your Slide Valve Carburetors All Keihin carburetors are pre-jetted for bolt-on operation. Pull the red knob, hit the start button, and it'll fire right up. Road Racing Motorcycles & ATV Keihin Flat-CR (FCR) Carburetor Originally designed and developed on world-class Superbike racing circuits, the Flat-CR carburetor broke new technological ground with an innovative flat-slide throttle valve that rides on roller bearings. I will now write about the specific differences. Keihin carburetors have long been considered some of the finest carburetors in the world. Before removing the carb from the bike make sure the petcock is in the off position and all fuel in the carb has been properly drained. Note Aug 10, 2021 · Keihin knowledgebase & troubleshooting. Makes a big difference when it dies with a hot engine. or am I imagining that it was stuttering on idle when I turned the fuel on? Mixture and idle screw adjustment - just a case of working back/forward to see where it runs clean? Trial and see? Mar 19, 2014 · Oscar Keihin 39 FCR or hot cams on my 2009 DRZ400SM sierrabound Sep 15, 2010 Supermoto Replies 16 Views 27,064 Oct 30, 2010 Roadstergal J Need Help finding a cheap Kehin FCR Carb 39-41mm with tps sensor JustPaul Sep 10, 2010 Maintenance and Repair Replies 8 Views 2,266 Sep 12, 2010 rallyguy Ktm 450 exc carb keihin fcr mx 3900a same as crf Mar 7, 2014 · a popular needle to use is the ncvq. Keihin FCR with removable intake bell is what you need to convert. the first year or two of the crf 250 carbs were 37 or 38 mm, they can be bored to 43mm but you will end up with a combo taper in and stright out bore job. 0:00 – intro Dec 31, 2019 · Well the kitchen is nearing completion (countertop install scheduled for Jan 3rd) and I was able to clear off my small workbench in the basement to actually work on a carb. Do this from the engine side of the slide as opposed to the intake side, and make sure the carbs are oriented such that the slides are moving vertically, so their weight takes up any slack in the throttle linkage. Learn about each component, its function, and how they work together for optimal engine performance. 5, 35, 38 or at the mosy a 40 pilot jet. The stock BST40 with a butterfly valve smack in the middle of air flow after the slide would be dreaming of flowing as much air as the 39mm FCR so this is already going to increase top end. Nov 16, 2020 · Challenged by differing views recently I thought I'd put up how I think jetting is influenced on the Keihin FCR. sort the needle straight thin enough that you can use a PJ in the 30s like a 32. D. It's supposedly taken from a Yamaha WR400F, which has the Keihin FCR 39mm carburetor from the factory. keihin is a subsidiary of Honda Motor Corp and their 2-stroke and 4-stroke carbs are state Dec 9, 2016 · DirtBikes. com contributor Mark Barnes tweaks Keihin's FCR carburetor to gain better performance from his carby KTM. It will also require an E model engine manifold boot and clamp as well as the correct air filter adapter, o-ring gasket and screws. Now that I have gotten it finished up to my satisfaction the most time consuming part of the whole process was sifting through all the different threads on the project. Hildo copied this section, the Tuning Guide, from KeihinCarbs. JETS R US KEIHIN NEEDLE FCR 35-41mm FCR-MX N427-OC my self I am using a EMN May 14, 2005 · To absolutely guarantee that the slide will not stick, the Keihin FCR also incorporates a push-pull cable system. Check the AP Oct 1, 2006 · The actual jets themselves for the Power Jet circuit are the same jets Keihin used in the FCR carbs on the 4-strokes for the leak jet. Any major engine modiications like higher compression pistons and racing exhaust systems may require minor jetting adjustments. i dont know if all years are the same. Perform all work in a well ventilated area away from any source of ignition. How does Keihin FCR carburetor work? The Keihin FCR carburetor is a highly adjustable and reliable carburetor used in many high-performance motorcycles and off-road vehicles. , but let me share my experience with a couple of the advantages I believe a cv carb. Besides of course the carb, the throttle assembly and a few screwdrivers. A lot of the FCR carbs will be having a lot of issues as those bikes age, and $150 for a complete new carb is a very cost effective alternative to the parts & labor for the complete new gaskets, seals, and accel pump kit. link/tusk-carburetor-mid-body-gasket-kitTusk Carburetor Rebuild Kit: https://rmatvmc. You'll only need 2 parts Jul 11, 2020 · Thanks for the update! Very useful review for the people fighting with the FCR carbs. Appreciate everyone adding their input with these carbs Feb 24, 2009 · As complex as the FCR carburetor is, it is more intimidating to look at than it is to work on. I don't know who makes that needle . The followong is a guideline jetting in the order given below. lots of differencesso i will condense the majority of the thread to info pertinent to my all time favorite 4-stroke carb the KEIHIN FCR carb. Any major engine modifications like higher compression pistons and racing exhaust systems may require minor jetting adjustments. Do not mistake it for a two-stroke’s air screw. The air screw is on the side of the carburetor All Keihin carburetors are pre-jetted for bolt-on operation. This complete Dirt Bike carb upgrade kit includes everything needed to install the Version 1 FCR Carb on your bike. Sep 12, 2003 · Our very own "edge" has compiled this great little jetting guide for all of you who are having problems, or need a starting point before you attempt to re-jet your YFZ450's FCR carburettor. Get yours now! Jun 5, 2007 · The top of the heap for a Keihin smoothbore carb install to a 1123cc motor is the 35mm or 39mm FCR (Flatslide) Keihin carbs. All the info you could ever need is at Thumper Talk. One cable is used to open the slide; the other forces it shut. Hi TT, I was wondering how often the Keihin FCR carb on my 2005 YZ250F should be rebuilt and what symptoms would indicate that it needs to be rebuilt. Overview of the Keihin Carburetor The Keihin carburetor is a high-performance component designed for precision fuel delivery in motorcycles. Apr 4, 2015 · Keihin used this carb variation on the TW, particularly in 1998 – (mostly now traceable on their FCR-MX carburettors) – the following two links will take you to web pages showing this: FCR-MX CARB Hot start button / Keihin FCR MX - Frank! MXParts It is clear from both the text and the pictures, that its function is that of a “hot start” button. First off what are the main differences between the two carbs? JETTING: Getting the most out of your scooter For whatever reason it becomes necessary to re-jet a carburetor, it is without a doubt a nightmare if you do not have a procedure to follow. Oct 18, 2021 · Over the course of this thread I learned that I had a 41 mm Keihin FCR slant body which is the precursor to the FCR-MX that @mxrob has done so much work figuring out how to adapt to the DR650. OK, I know it's "late in the day" and that perhaps most Monster riders have moved on from carbs to fuel injection. As for Purevils vacuum port issue, Suzuki part # 13685-29FOO is vacuum port nipple that threads to intake port. I recommend removing the carb from the bike to install this kit. Thanks, great! :tup: This is a pretty basic outline for jetting on the YFZ450. I did have one and it does work , just don't know who makes it . Each section plays a role in fuel delivery and engine efficiency, so a precise layout of these parts ensures the smooth operation of the system. Feb 5, 2017 · Wrong float height? Carb not square? - not leaking fuel (overflowing) and tested the float needle off the carb during strip, all ok including sealing. save your money and spend 125-150 and get your carb bored to a 42mm or even a 42. It’s certain that the carburetor is a full dinosaur and slated for extinction with the evolution of fuel injection, but for the next few years dialing in the Sep 18, 2012 · Were do i start with these carbs? the previous owner did a lot of work including fcr 41's, slips on's, air box mod, port and polish heads but i can't get this pos to run right. The TPS is located on the carb on the opposite side as the throttle cam and is ADJUSTABLE! Essentially the reason for the idle issues is you have the slide set to high or low and then when the ECM figures this out it adjust timing. On the 4-stoke, smaller jet was richer since it was a bleed off (leak) and on the 2-stroke smaller jet is leaner since it is direct in the fuel path to the carb throat. To wit, if you chuck it down the road #DimeCityCycles #Keihin #Carbs #motorcycleKeihin Fuel Systems is a huge manufacturer of carbs for a myriad of different applications. They haven’t delivered yet so I don’t know what jets are on them. Remove the top of the carbs as you would to access the needles. I measured the venturi on the engine side and it measures 41mm. The intake & rear O. Jan 27, 2003 · My S has the FCR carb (the aftermarket one without TPS or choke) and my bike feels substantially more powerful than a stock S does. KEIHIN FCR / FCR-MX / CR SPECIAL / PWK / PWK-S / PJ / PWM / PE ULTRASONIC CARBURETOR CLEANING & REBUILD SERVICE OEM CARBURETOR PARTS / GASKET KITS CUSTOM KEIHIN FCR SETS FOR ENGINES NOT LISTED CUSTOM MADE KEIHIN FCR SHAFTS Nov 16, 2009 · Take off the cable cover on the side of the carb and work the throttle: Does the AP cam contact the AP screw? Does the AP spring (on the AP screw) compress? <- if yes then there should be pressure on the AP diaphragm If the carb has sat for a while, the inlet port to the AP cylinder can become clogged or the check ball can get stuck (have to take off the float bowl to check this). Head work is ultimately the most limiting factor in the SS engine. usually about 39-41mm and they can be bored out well, from 42 to 44 with some work. Sealing Keihin carbs have two kinds of air cut valves. No, you don't need the TPS. This is how a LOT of people have bricked their FCR carbs, it has a very intricate gasket that is prone to leak after being taken apart, even if you replace it. FWIW and for the benefit of those still with carbed Ducatis, be it M900, 900SS or any other model converted to Keihin flatslides, here is some info. tusr8oxlbulr5wle4pquzzrddwroubvgazogzuhxtf38mio2