Fcr Accelerator Pump Not Working

Race Fuel Compatible Components and jetting available to work with "pump-gas" and racing fuels including Alcohol and Methanol. Since we had learned how to eliminate this problem as part of the testing and development process with the Mikuni HSR Carb on our Volvo supercharger systems, we knew how to make it work on the MG. The nozzle sticks up much higher than the nozzles on the bigger FCR carbs and if you advance the timing of it enough to get instant squirt to eliminate the bog the spray can hit the slide before it is out of the way. Then you may have to go on to adjusting the accelerator pump rod and the leak jet. Press J to jump to the feed. The CRF-R is a liquid-cooled four-stroke engine. I think my accelerator pump isnot working. It is a 40mm crf450 carb I wouldn't think the od of the carb would be any different than other peoples crf450 carbs. I know it will work awesome if i can make it Fit. Do the BK mod and set the AC pump timing to just under 1 second. i've been thinking about buying an fcr carb but i hear alot of pros and cons on them, the stock 450 carb seems to work o. I will get a shipping quote and let you know what. eldelbrock quicksilver 6. It is important to start the engine prior to doing this test. We've put together a wide group at awesome prices. So the information on this page will mainly apply to that style. All product, brand and company names and logos used or mentioned on the this website or any of the services made available by this website (the “Services“) are the. Keihin FCR (MX) accelerator pump diaphragm kit. FCR-MX EXPLODED VIEW FCR-MX37, FCR-MX39, FCR-MX41. No Auto choke. (This includes non or delayed delivery for the complete order) When in doubt please consult your dealer or contact us direct do not order. Check that the pump squirt just misses the slide when opened: adjust the pump start adjusting screw if necessary. replacement o-ring and d-ring washers. Flat slide with vacuum release plate for best throttle response and flow control. We aim to remove reported. Most engines that do not run well have chokes, main jets, accelerator pump discharge jets and/or fuel pressure that are too large for the engine, and running conditions. I know it will work awesome if i can make it Fit. 72 57331061000 rod accelerator pump 1 83 59031013044 hose connector cpl. When turning the throttle, the push rod of the accelerator pump link-. Many of the systems in your carb do not work until the slide opens. There seems to be alot of confusion what mods there are and which works best on a Keihin FCR pumper carby. A wide variety of pump carbs options are available to you, such as cleaner & wash, carburetor. This guide covers problems and solutions routinely encountered on stock and mildly modified motorcycle engines. On the other hand there are also a few members using flatslides,i'm not convinced about these as there seems a wider range of issues than. I did forget to reattach the accelerator pump transfer hose from LH to RH carbs, but as it turned out that didn't influence the pumps (not) working. As the horsepower goes up, so does the number of potential situations that impact performance or create problems. My XS had stock 38mm carbs so I'm not losing anything by switching to these, they're either the same diameter or smaller. Some riders feel that adjustments to this component are necessary, but if it is working properly, you can ignore the pump. This carbure-tor incorporates an accelerator pump for air and fuel metering during acceleration. A few whacks of the throttle provides the extra richness required for the initial start AFR. I don't know DRZ's all that well, though. My local KTM guru advised that even better throttle response could be obtained with a couple of easy mods to the KTM’s Keihin FCR carburetor, and added that mixture adjustments could be made much more convenient with a third. Hero Member. 1 Accelerator Pump Overhaul Kit (unique fitment for B & C versions only) 2 idle mixture screw washers; 6 float bowl screws (4 x 16 mm) 1 mm cotter pin for accelerator pump linkage - 1 supplied (simple item, but hard to find elsewhere) ** included in all kits, but not needed for "A" versions. The video shows the step by step process of modifying the carburetor with an o-ring and also included are a few close up pictures for clarity. Depending on the pump circuit design, if the circuit downstream of the pump isn't sealed the pump can't push and suck like it's meant to and nothing hapens. Have had a bit of a look, removed air filters and notice that when the accelerator is moved that only one jet is squirting fuel into manifold. Start another thread and back that nonsense up. is amazing as its mechanical slide and has a accelerator pump. In fact it was worthless. Before you start with the troubleshooting and repair steps below, use carb cleaner and an air gun to clean and blow out every jet, orifice, and passageway in the carb. FCR Carburetors. The big change is that the carb float bowl has been modified to increase the capacity of the accelerator pump by approximately 50%. But you asked about the price-is-no-object best, and IMHO that would be a pair of Keihin FCR 4-stroke flat slide pumpers. There seems to be alot of confusion what mods there are and which works best on a Keihin FCR pumper carby. 1 46 76231155000 drain screw + o-ring 1 47 57331060000 cover accelerator pump 1 48 57331057100 diaphragm accelerator pump 1. I've been working with the Delilah for about a week now, still haven't hit anything- it's not just you bro. How can I tell. FCR Carburetor Rebuild Kit includes: Carb top gasket. R&D Racing: the originator of the adjustable leak jet system. I just finished rebuilding a Keihin FCR from an '06 Help with FCR throttle stop setting set the throttle stop then re-attach the accelerator pump. No Auto choke. Realize this is a long post ---- if you have any interest in more power out of your 625 SMCkeep reading. Summary: Comparison of two 900SS fitted with 39 and 41mm Keihin FCR and a discussion of FCR versus the original Mikuni 38mm CV. Fits all Keihin FCR-MX carbs except '07-'08 CRF250/450. This is also a reverse linkage accelerator pump so the pump twist as fast as the throttle does. But, it does not have enough oxygen. Anti cabitation fuel chamber proven to remove air allowing the diaphragm pump to work at full efficiency, giving superior throttle response. I do believe that a four stroke carburetor does a pump action on. In normal applications, the ACCELERATOR PUMP should not require any adjustment. Bog, Hesitation, Stumble. I put a o-ring or small wire tie on my accelerator pump linkage to make sure to get a even smooth shot from the pump. The Honda carbs basically incorporated the idea from the aftermarket float bowls, quik shot, etc and also the AP-wire mod everyone was doing. as for the questions about FCRs vs CV carbs is a lot. You need to call carlos on that. CV carbs take a while to open as the revs increase. songtreebooks. There are a few shops that specialize in mods and service for these carburetors. (1) Remove the float chamber body. Keihin FCR racing accelerator pump testing. Honda TRX450R Parts and Accessories. This accelerator pump has a stronger duration spring that allows the pump to be more active and thus help cure most of the accelerator pump related hesitation we see with these carburetors. If you see the stream(s) of fuel, the pump is working. They take the old-school FCR pilot/slow jets: This is the exploded view link and photo:. Scroll down to bottom of page for other parts. Baseball-Adult & High School-2019 Easton -3 BBCOR High School College BB19FZ - 34 31 oz. I have had to get two sets of four which I will modify to become six. I was able to get the car started with some quick start and I ran it for a few. If you see the stream(s) of fuel, the pump is working. the stock carb is cv carb it has a rubber boot that needs to be drawn up by vacuum to pull the slide and has no accelerator pump. Get the best price with fast shipping on Moose Racing Fuel Mixture Screw By ZipTy at BikeBandit. You search Auto repair manual PDF how does the fuel pump work on a 2005 kawasaki mule, if there are search results will appear below. It should work fine otherwise why would KTM have. Here I have to offer used and new GENUINE KEIHIN carburetors and carburetor parts for dirt bikes, ATV's and street bikes. REPAIR SET FOR KEIHIN FCR-MX CABRURETORS THIS PARTS SET WILL ONLY REPAIR THE MX MODEL CABRUETORS 1 x Float Chamber O-ring 1x Top Cap O-ring 1 x Fuel Mixture Screw O-ring 1 x Float Seat with O-ring 1 x Float Valve 1 x Accelerator Pump Diaphragm 1 x Accelerator Pump O-ring 1 x Accelerator Pump U-ring Several Keihin FCR / FCR-MX carburetor parts in stock. We have the best prices on dirt bike, atv and motorcycle parts, apparel and accessories and offer excellent customer service. Reducing the gap will cause the ACCELERATOR PUMP to deliver fuel earlier. The first key bit of information is that all four-stroke engines have a lean air-fuel ratio when the throttle valve is opened semi-quickly. Lower vacuum, however the FCR's have a far greater adjustment range and accelerator pump too. Or a weber conversion for a 1994 triton 2. Air filter adapter allows the use of an air cleaner designed for stock CV carburetors to be used. I'm not exactly sure, but from the beginning ofthe thread, I don't think the squirt duration was the problem, but rather the squirt timing. Browse your favorite brands affordable prices free shipping on many items. I was wondering if anybody can help / give advice for cleaning the accelerator pump circuit. Twenty's QuickShot Accelerator Pump Fits 4-stroke Keihin FCR carbs and it is now updated with an adjustable leakjet. Accelerator Pump Instant throttle response at nearly any RPM without hesitation. Have just splashed all my Christmas shopping money on a set of new FCR's. keihin carb harley keihin carb parts keihin fcr carb Keihin Carb Accelerator Pump Diaphragm. Got the accelerator pump working when I pull off the bowl, but I'm not seeming to get fuel to squirt into the actual body of the carb. Rollers on throttle valves and progressive linkage for smooth operation and control. As for nonsence, if you install the proper low speed jets into your "Big throat carbs", you do not need an accellerator pump to make it accellerate. REPAIR SET FOR KEIHIN FCR-MX CABRURETORS THIS PARTS SET WILL ONLY REPAIR THE MX MODEL CABRUETORS 1 x Float Chamber O-ring 1x Top Cap O-ring 1 x Fuel Mixture Screw O-ring 1 x Float Seat with O-ring 1 x Float Valve 1 x Accelerator Pump Diaphragm 1 x Accelerator Pump O-ring 1 x Accelerator Pump U-ring Several Keihin FCR / FCR-MX carburetor parts in stock. 1 40 57331008000 arm pin float 1 41 78031096044 starter valve cpl. They have interchangeable outlets, so you can adapt them to various sized manifolds. Please try again later. Accelerator A pedal for regulating speed of an engine. If not, you need to replace the diaphragm in the accelerator pump that is on the bottom of the carb float bowl. , all which has to be changed to make work like the ones I think you are getting. No 1 is you have access to instant full throttle. Related Links: Keihin. control screw factory 09 1 35 57331085000 buffer plate 1 39 57331009000 float cpl. the problem with triton is the carby, auto chokenot working accelerator pump not working But it still drives okas long as long as you dont suddenly have to trap. The 33mm are the normal setup for the F2 and F3 engines. When the motor is just idling, there isn't very much vacuum being created. Carburetor Troubleshooting Guide. Gives a much more consistent accelerator pump squirt. So it's a bit of a ritual to start cold. He also has the adapter for the stock cable to work with the fcr. Fuel screw spring, wash and O-ring. People have done all sorts of carb swaps. it can take more force than you think to pull the rod out as it "snaps" into the plastic rod linkage. Why not? The fuel, heat and oxygen mixture is off. The only other approach is to limit the stroke by as mush as 50%. Can you not fine tune the accelerator pump from the adjustment screw on the throttle cable side with the screw stop adjuster?. Price if you send us the motor $1899. KX™ models currently use a Keihin FCR-. 1 42 54631220000 float needle 1 43 54531621000 clamp 1 46 76231155000 drain screw + o-ring 1 47 57331060000 cover accelerator pump 1 48 57331057100 diaphragm accelerator pump 1. List of FCR Carburetor Needles List of FCR Carburetor Jets * If the fuel valve interferes when mounting, this can sometimes be avoided by replacing with aPingel or other outside company valve. If I poured a shot of gas down the carb, the engine fired right up. If this doesn't work for you, you must take the time to learn the other infinite number of options to start the WR 400. Accelerator A pedal for regulating speed of an engine. However, here's a list of carburetors that I have heard of working: TM32/33/34 (accelerator pump and non-accelerator pump) BST33; Edelbrock 32; FCR 32; PWK 28. When the motor is just idling, there isn't very much vacuum being created. 7) Check idle solenoid, especially for power/ground, replace solenoid if necessary. This is not always true. Click here for other parts not listed below. Keep note that this carb will still run great without any upgrade options selected, with a gain of 8% power over stock option. The accelerator pump-side float bowl is filling with gas, the fuel pump seems to be doing its job. Flat slide with vacuum release plate for best throttle response and flow control. Not sure yet. Related Links: Keihin. At least one brand mentioned having an accelerator pump, so you give a shot of gas when you crank the throttle, which improves the bottom-end response. Let us know what you find to be the problem. It does not include safety rules generally observed in workshops and is based on the assumption that the work is performed by a mechanic who has completed his vocational training. Keihin FCR (MX) accelerator pump diaphragm kit. Keihin FCR (Flatslide CR) Racing Carburetors. NOTE: When dismounting the cover, pay special attention to the spring and seal rings since they are easily lost. It does not include safety rules generally observed in workshops and is based on the assumption that the work is performed by a mechanic who has completed his vocational training. Find great deals on eBay for keihin carb and keihin carb harley. How-To: FCR carburetor accelerator pump timing adjustment Blog post for more info Learn How-To Repair and Maintain your A Certain Scientific Accelerator - Opening (HD. He also has the adapter for the stock cable to work with the fcr. If not how in the heck can you clean it real good?. can you help me. With all upgrade options selected, there is an additional 10% increase in overall power with perfect throttle response. 877-676-3742 *price does not include any valve train components needed or additional parts. If you own a modern 4 stroke dirt bike, then it is equipped with a Keihin FCR carburetor. Hey Guys, I'm replacing all the gaskets on my Weber's and this is first of probably many questions. keilhin FCR 39 3. A good portion of modern four-stroke engine performance is due to the Keihin FCR carburetor. new and used parts are available for these carburetors - please send a message with your request or call 1(313)-915-0075. No products available in this category for Suzuki parts. If a rich stumble occurs as the throttles are opened, the ACCELERATOR PUMP timing can be delayed by widening the gap on the ACCELERATOR PUMP linkage where it makes contact with the plastic lever. When you opean the throttle up it squirts fuel in to the engine. eBooks online, or downloading their. so i dug deeper and found that with the accel pump removed the actuation rod moves real freely. He sells these carbs and sets them up to run PERFECTLY. Was good for 88 SAE on the rubber after I got it dialed inn. songtreebooks. But, it does not have enough oxygen. When the motor is just idling, there isn't very much vacuum being created. Related Links: Keihin. If the plugs are reading good after a wide open pass, I would start with checking the accelerator pump timing. Am i still to low or do i have a false air problem? Also if you have a running xt600 with an fcr pumper, please share your jetting/setup My 1st and 2nd failed jetting on the whiteborad, also pic of my xt600. Adjust it so it does not hit the slide and the response was unreal. There are many parts that can wear out and get dirty or gummed up. I just rebuilt my old-school horizontal FCR39 (not MX) carb and accelerator pump on my XR440. This kit fits: 2005-2007 Suzuki RM-Z450. Start your engine, Blip your throttle open, if the engine stutters, (hesitates), it is not getting enough fuel so turn the screw counter clockwise to increase the amount of fuel squirted from the accelerator pump into the carburetor. The accelertater pump is put together - Answered by a verified Motorcycle Mechanic. Then I checked the accelerator pump and i can't get the thing to squirt for nothing. Check the pictures below for details (Keihin FCR MX carburetor, 40mm to 41mm). This Keihin FCR carburetor kit is easy to use and provides maximum horsepower. It does sound related to the squirt/timing which the o-ring somewhat addresses on a good working stock acelerator pump. 2 CYCLE CARBURETOR REPAIR AND WHAT TO LOOK FOR BEFORE YOU. Our Honda XR650R kit includes a pre-jetted Mikuni TM40-6 pumper carb with pre-installed adapters, and push/pull throttle cables. For any question please call us. When you opean the throttle up it squirts fuel in to the engine. Accelerator pump works. it can take more force than you think to pull the rod out as it "snaps" into the plastic rod linkage. Tuning a FCR is a little trickier and one suggestion I can offer is a R&D Flex jet for the fuel screw and an aftermarket accelerator pump bowl. The only other approach is to limit the stroke by as mush as 50%. Carburetor and Fuel System Troubleshooting Guide. (This includes non or delayed delivery for the complete order) When in doubt please consult your dealer or contact us direct do not order. The crap I work on is much simpler, (no pumps, no air cut valve diaphragms to leak etc), but can still get into using different slide cutaways which can add up. This is not always true. Before you start with the troubleshooting and repair steps below, use carb cleaner and an air gun to clean and blow out every jet, orifice, and passageway in the carb. Can you not fine tune the accelerator pump from the adjustment screw on the throttle cable side with the screw stop adjuster?. When a four-stroke engine gets hot, it doesn't like to start. 2011 450 sx f engine. "accelerator pump" への豊富 by using bearings on the working parts of the throttle, the performance of the FCR has become a byword in racing carburetors. With modern gasoline, it is quite possible the carburetor will be completely dry prior to starting. No biggie for the AP work. Kientech Fuel Screw for Suzuki DRZ400S/SM with the Mikuni BSR 36mm carb only. I did take a buch of pictures of a friend's dyno room and work area for limited distribution. i believe the pump allows for a leaner jetting. I don't know DRZ's all that well, though. Fuel injection can more precisely deliver fuel, but it lacks the all-important accelerator pump. The accelerator pump is responsible for providing the momentary additional fuel needed under heavy acceleration conditions. keihin carb harley keihin carb parts keihin fcr carb Keihin Carb Accelerator Pump Diaphragm. I finally found the parts and rebuild kit I needed on Keihin-FCR. Accelerator pump (It helps to leave this disconnected during dyno testing so as not to create a momentary artificially rich condition which may lead to misleading exhaust gas analyzer readings. Never run with screw more then 3 turns out. Welcome to my eBay Store. It is a daiphram carb. when they work is just as important as how much they spray. I think I will be blocking off the leak jet completely. This Keihin FCR carburetor kit is easy to use and provides maximum horsepower. In normal applications, the ACCELERATOR PUMP should not require any adjustment. During periods of fast throttle actuation the gas in the accelerator pump reservoir provides a hydraulic resistance tha. Not sure yet. that's the biggest they sell. Single screw adjustment of the pump nozzle provides maximum throttle response and perfect adjustment of the carburetor!. Well I got around to getting the 35mm FCR's on today, but I am not getting any squirt of the accelerator pump. Watch the video: FCR accelerator pump in slow motion - YouTube Keihin FCR Accelerator Pump Demo - YouTube Accelerator Pump - YouTube. RZ/RD 350 & Misc. The WR 400 is alive. This spring did not work as well. This is needed to compensate for the lean condition of the slide opening. have an issue with my 39mm keihin fcr carbs which are fitted to a GSXR 1100,which is fitted to a speedway car, has rather large flatspot down low rev range. When you had the carb off you should have checked the accelator pump AND the squirt. 2011 450 sx f engine. In more serious cases of accelerator pump failure, rapidly pressing on the gas may cause the engine to stall, again due to the lean condition that can be created when the accelerator pump is not working. The only other approach is to limit the stroke by as mush as 50%. Have had a bit of a look, removed air filters and notice that when the accelerator is moved that only one jet is squirting fuel into manifold. Keihin FCR (MX) accelerator pump diaphragm kit. Direct replacement for the stock spring and exactly like the old Merge Racing spring. Patented adjustable accpumplock for a Kehin 4T carburetor. The EMN really isn't the right needle for our bikes. Have just splashed all my Christmas shopping money on a set of new FCR's. fcr-mx rally 07 1 96 59031077200 tps-sensor fcrmx 190mm 2006 1 99 57331099000 gasket set fcr-mx keihin 1 077623110 / c077623110 * new part x as required 11 carburetor. You search Auto repair manual PDF how does the fuel pump work on a 2005 kawasaki mule, if there are search results will appear below. JDKH08 - KEIHIN 38mm PWK Airstriker w/Jet Kit · JDS005 - Suzuki with Spring, Washer, O-ring Kit · JDKH30 - KEIHIN FCR-MX 39mm Carburetor (Non-TPS). We are Keihin and Mikuni dealer - we're here to help. the throttle pulley cover should already be off if you have removed the carb. 1 accelerator pump diaphragm; 1 accelerator pump o-ring; 1 accelerator pump u-ring. This kit fits: 2005-2007 Suzuki RM-Z450. If you push it quick your actuating the accelerator pump and flooding it. Not only did they have all the parts I needed, the customer service was great. Problem CONDITION POSSIBLE CAUSE CORRECTION 7) Idle cut-off solenoid not working. When you had the carb off you should have checked the accelator pump AND the squirt. The R&D Racing Power Bowl 2 is a redesigned float bowl and accelerator pump that improves the fuel flow of the Keihin FCR carburetor by eliminating cavitation and froth during all the jostling. There are a few shops that specialize in mods and service for these carburetors. Carburetor and Fuel System Troubleshooting Guide. This is also a reverse linkage accelerator pump so the pump twist as fast as the throttle does. The EMN really isn't the right needle for our bikes. We have the best prices on dirt bike, atv and motorcycle parts, apparel and accessories and offer excellent customer service. Start another thread and back that nonsense up. Replace the float bowl, carefully placing the accelerator pump rod into its rubber boot. Slow motion comparison of 35 vs. SALE price for Parts ONLY $1699. The next progression from those two manufacturers was the move to flat slide smooth bore carburetors. They are a compromise carb because they have no accelerator pump. I set the choke, starts first kick, run with choke on for a few minutes, then release the choke. Interesting. The Keihin FCR's are not. From the back of the bike looking forward, our carburetor is mounted at 1:00 to keep the accelerator pump as far from the header as possible and keep heat off the fuel. SALE price for Parts ONLY $1699. 5 turns, without rich black smoke with all possible adjustments to the idle speed screw. eBooks online, or downloading their. I've removed the carbs and cleaned them, verifying that all the passages are clear. Does anyone have a list of FCR equipped bikes that will work as donors for my DRZ400S? I realize I will still need to get boots, cables, other misc. It does not include safety rules generally observed in workshops and is based on the assumption that the work is performed by a mechanic who has completed his vocational training. Tune them from the bottom end up (get pilot jet, air screw, mixture screw settings, then play with the needle height, then the main). Tokyomods, with its many years of racing and race bike preparation experience, is now working for you! Tokyomods was established to share its racing and performance knowledge with you, The Motorcycle / ATV enthusiast, the people who just love the sport and just love to ride. Browse your favorite brands affordable prices free shipping on many items. There are 383 pump carbs suppliers, mainly located in Asia. Perform all work in a well ventilated area away from any source of ignition. On my '86 it would not fit between the heads so I had to space it out about an inch. However, it's surprisingly time consuming to remove or install the pump connecting rod. Got an old EXE that has been acting a little strange for last 5 to 6 rides. Bought this spring to use on my FCR-MX 41mm which is on my DRZ462SM. Does anyone know if they will fit straight up to the standard airbox? my bike is a 94 cbr900, they were fitted to a zxr750 race bike so my guess is that I'll need to re jet them, are replacement jets easy to get hold of ?. Final stage of the rebuild: testing the accelerator pump and adjust timing if needed (FCR41 Yamaha R1 kit). The accelerator pump was designed into the carburetors to smooth engine operation from low rpm low load scenarios to. Browse our daily deals for even more savings! Free delivery and free returns on eBay Plus items!. The purpose is to make up the fuel lost to low vacuum until the revs build and recreate the vacuum. Keihin FCR MX carburetors. mikuni VM 38 4. If you live in Canada, and you want them. Press J to jump to the feed. Four stroke carburetors have accelerator pumps that produce a squirt only while the throttle is being added, not at a constant throttle or trailing throttle. This kit fits: 2005-2007 Suzuki RM-Z450. When you release the throttle and the accelerator pump diaphram opens again, gas is sucked through the hole in the bottom of the carb bowl to refill the pump. That is what I did with my 39's to configure it how I wanted. eldelbrock quicksilver 6. If this cover/spacer is left in place the AC pump will not work. This patented 3rd generation Quickshot combines an innovative triple effect to; completely fill the pump chamber with fuel, eliminate all trapped air from the system and provide and adjustable leak jet circuit for quick hand tuning. The FCR is a work in progress for me so you can always. In more serious cases of accelerator pump failure, rapidly pressing on the gas may cause the engine to stall, again due to the lean condition that can be created when the accelerator pump is not working. 1 40 57331008000 arm pin float 1 41 78031096044 starter valve cpl. then, when tuning is done, hook it back up and tune it too if required. I don't know DRZ's all that well, though. Tokyomods, with its many years of racing and race bike preparation experience, is now working for you! Tokyomods was established to share its racing and performance knowledge with you, The Motorcycle / ATV enthusiast, the people who just love the sport and just love to ride. again due to the lean condition that can be created when the accelerator pump is not working. I recently bought a 97 KX500, been getting lots of good information for it here question - I've got a Keihin FCR41 (41 mm. The Keihin FCR's are not. In fact it was worthless. Please read the entire manual before starting to work. Fits all 37-41 mm. Inspect: Diaphragm (accelerator pump) 1 Spring (accelerator pump) 2 Accelerator pump cover 3 O-ring 4 Push rod 5 Tears (diaphragm)/damage → Replace. The 2000 DRZ-400E has the FCR-39 not the FCR-39MX. This kit fits: 2005-2007 Suzuki RM-Z450. This site is not owned or operated by Keihin Automotive, all products listed on this site are made available through multiple online Keihin Carburetor parts supplier websites. I'm not exactly sure, but from the beginning ofthe thread, I don't think the squirt duration was the problem, but rather the squirt timing. mikuni VM 36 5. The accelerator pump gives the engine a quick shot of raw fuel so as soon as the slide opens, the engine has gas so it won't stumble. A 750 double pumper Holley carburetor is a high performance carburetor that incorporates two accelerator pumps that are manually operated. As in slide opens, vacuum drops, fuel barely makes it through, so you need the pump to help eliminate the stumble. Then I checked the accelerator pump and i can't get the thing to squirt for nothing. The whole reason that I started working with Marty Dahl on the dyno was that cruddy jetting from Thumper Talk. high quality allen screws for top cover, float bowl and accelerator pump cover. Hi Frank and welcome to the forum. The pump may be squirting to early and its just hitting the slide and not going into the intakethats okay on a vtwin but not a single cylinder engine. Honda TRX450R Parts and Accessories. Two are OEM, the third has a Boysen Quick Shot accelerator pump. We are Keihin and Mikuni dealer - we're here to help. Sounds like since it runs better without the air box cover on, it's rich. KX™ models currently use a Keihin FCR-MX carbure-tor to handle the fuel require-ments for the potent engines. I have a yamaha 2007 yfz 450 with keihin fcr carb ,I cannot make it run right no matter what i have done to carb.