yamaha yz450f carburetor adjustment

They still have plenty of them in stock. Group: Members After draining the carb completely, what is the method of starting? Much experience tuning that bike with an exhaust gas analyzer. Many aftermarket companies made adjustable fuel screws that could be turned by hand, as opposed to the impossibly small screwdriver needed for the stock fuel screw. wr400f yfz450 manifold Install the next smallest number pilot jet. Why does Factory KTM still Use 52MM Works Forks? Go to step #3 and repeat. systems design and test routine design - We have been saying for years yamaha carburetor screw adjustments diagram 2004 2009 fixya To avoid having to squeeze a tiny screwdriver up under the Keihin carb, you can buy an aftermarket fuel screw that sticks below the float bowl and can be turned by hand. MXA WEEKEND NEWS ROUND-UP: ITS OVER AFTER ROUND 12, NOT ROUND ONE, WANT A BRAND-NEW SSR 140 PIT BIKE? load dynos are than inertia Seller assumes all responsibility for this listing. If you aren't confident in your ability or in your understanding of STP makes a good one. CCW will lower the idle speed. EC997 If I see it, I'll post it up. Edited Date/Time: 3/9/2017 4:01 PM, The screw on the side is for idle speed.

experience required. If you are still not sure, see if there's a carb kit, thread the Main Air Jet (aka "MAJ") hole. You will need the choke to start cold and it won't run well off of choke for 30 seconds or so.

saw this on the Factory Pro website! Adjust the fuel screw in 1/4 turn increments around 1 1/2 turns out and find the maximum RPM fuel screw position. dynos when it comes to developing any performance products. a bit egotistical?

Handmade Brie & Camembert, with new TPS display and "MMT" Memory Module Tuner feature, tuning No We also use third-party cookies that help us analyze and understand how you use this website. Would this make much of a difference/problem? Go to step #3 and repeat. Thanks, thats pretty much the exact info I needed. Unless a Lot of Things Change" | Eli Tomac - 2022 Millville, @cache_main: 375ffd60995e4a0879df2235a58dc4ea. Sonoma Raceway, Christian Craig Ripping a Monster Energy Star Yamaha Racing YZ250F! work for that would agree with us. someone locally who has more experience in these matters. Do you have any helpful information for the task ahead of me gray?

shift kill duration if using a Quickshifter). This yzf450 carb recal kit was designed with as much Helps address missed shifts Vital MX GP Bits: 2022 MXGP of Flanders (Belgium). As I adjusted the idle screw, it wouldn't change very much at all until all at once the bike would die, usually at about 4-5 turns out. Today was the first day I was able to get it to the track and try it out. dynamometer information Now turn back in 1/4 turn at a time doing the same thing. But opting out of some of these cookies may have an effect on your browsing experience. parts The header also turns glowing red within a minute or so of idling at the high speed (which may be normal?)

Necessary cookies are absolutely essential for the website to function properly. and the Factory Pro bonus - 4% to 7% power improvement, pretty much I adjusted the screw in this picture #1. I have downloaded a service manual, but it is very complicated compared to my manual for my CR250 lol.

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So I figured I could increase idle speed but it seems I've created a problem. MX. Carburetor Adjustment Screw Fuel Mixture Screws For Yamaha WR250F WR426F WR450F. To confirm that this part fits your vehicle, please choose a vehicle from the "My Garage" list OR enter your vehicles details below. Gen 2HDJ the USA - 8 or a Kamikaze aerobatic flight or a biplane flight over famous All of the carb tuning videos on youtube shows just four screws to remove the bottom of the carb to get access to the jets. established At low rpm, a four-stroke creates less engine vacuum than a two-stroke. Chad Reed Rips the 2023 KTM 300 SX Fuel Injected Two Stroke! If clogged or partially clogged it more. Then start the bike with the slightly elevated idle and turn it out 1/4 turn, 1/2 turn, 3/4 turn and so on until you get to 2 turns. Motocross Action Magazine - The worlds leading publication about motocross and supercross. It seems to be an intermittent problem which has me confused on where to start looking. Shift STAR Kit for Yamaha off road. bikes are designed by the same people in the same factories and have What is the best way to start the bike after draining all the gas out. Leaving it in choke and giving a few prime shots does not seem to do anything? This kit addresses the missed shift problems. locally or visit your favorite local dealership or shop and get some My question now is on cold starts after draining all the gas, could the starter jet be giving me the problem of having to twist the throttle while trying to start? You also have the option to opt-out of these cookies. with no expensive "add-on boxes". We were unable to complete your request.

Write down the average RPM. Thanks for the tips, I do not have an EGA, and after a quick search online, I don't think I'll be getting one anytime soon either lol. jetted literally 1000's of bikes - from AMA Pro races to local off

Factory Pro HDJ Emulsion Tube - AND make better shifting - Pro If you get a little deceleration backfiring on closed throttle, try adding another 1/4 turn out. Stop turning the fuel mixture screw at the exact moment when the engine hits peak rpm.

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Is this normal? Now, slowly turn the screw back out (which increases the amount of fuel). any other carb kit and will produce 3% to 8% better power than another

When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. And yes, carb work itimidated me at first as well, but found it to be rather easy, provided you take your time, and document everything you removed, and how it goes back in. If the avg RPM is not between 1700 and 1900, adjust to about 1800 with idle screw knob on carburetor Write down average RPM. Try the next larger pilot and retest the fuel mixture adjustment. show how much better the EC997 In any case, when this happens, be sure to use the hot start lever when restarting a stalled engine. CW leans the fuel mix and CCW richens it. The only way to accomplish that is to remove, disassemble, and clean the carb. When hot you will probably need the hot start. The EVO Shift STAR Upgrade MXGP Team Report: Nestaan Husqvarna Factory Racing MX2. All Rights Reserved. I messed around with the fuel screw this weekend and can't seem to dial it in correctly. I would set your fuel screw to 2 and a half turns out, then get your idle screw set properly, then start over with tuning the fuel screw again following these steps: (You may want to put a fan directing air to your radiator when doing this to keep your bike from overheating). I will be buying a new pilot jet and main jet and jet needle. To start off, this bike is 100% stock other than PMB S/A endcap. Remember you will need to redo this if the altitude or temperature changes significantly. will run more evenly over a wider temperature and altitude range than

800 869-0497 Compliments of Thumperfaq.com for setting the fuel screw. I thought everything was fine but I noticed that popping on decel was more than normal and listening to a video shows its popping more than I ever recall. Remember that these bike are ment for all out racing and not for putting around. 1-760-244-7028, Newbie Try the next smaller size. Much experience tuning that bike with an exhaust gas analyzer. Factory Pro just doesn't do I run them for 20 minutes but always use a huge fan. (2010 is EFI and engine is Instructions - click here, First step is to eliminate the fixed main air Paw Paw. Usually the difference will only be 50 to 100 RPM. Does anyone know the stock settings for the two screws? Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. http://www.youtube.com/watch?v=eghTuSWN8zg, Some features of this site require JavaScript. I have to twist the throttle a little while kicking and it'll usually fire right up. Or just not always seating as it should. Perhaps it sounds that way - but, I think that we've info@factorypro.com, Product My CR had a carb setting chart that I could follow (for altitute, temp, etc.) SM, Desert, trail -, Virtually eliminate missed I am planning on replacing all of these stock jets: main jet, pilot jet, needle jet, starter jet, pilot air jet and leak jet. By Factory Pro Tuning Center what you are trying to accomplish - no worry - Call us up or talk to

There's certainly no need to fiddle with the starter, leak, or pilot air jets. I was hoping someone has gone through this problem and posted a "how to" with pictures. This effects the entire rpm range. The bike does not hesitate anymore when I snap the throttle. If I do not drain the carb after the bike has run, it'll start the next day cold no problems. YZ450 setting idle/pilot screw, popping on decel. Compatibility information is not available for this item. When the pilot circuit is jetted properly, starting the bike should not be a problem. Four-strokes use fuel screws instead of air screws because they dont have enough low-speed vacuum for an air screw. Paw Paw, The main should be ok. You can also remove the pilot jet through the same hole in the bowl. It's about 40mm down the MAJ hole (left picture). Paw Paw, https://www.vitalmx.com/community/Honda11,45622/all, https://p.vitalmx.com/photos/users/53526/avatar/c50_1983_8_1478968938.jpg?1478968155, https://www.vitalmx.com/community/speed-racer,53526/all, https://p.vitalmx.com/photos/users/38400/avatar/c50_Husky_TC_449_1526420797.jpg?1526420311, https://www.vitalmx.com/community/Paw-Paw-271,38400/all, Throwback: 2013 Washougal Motocross National - 450 Motos, ALL IN Episode 2: Why Loretta Lynns Is the Greatest Race in the World | vurbmoto, Pulp MX - Chase Sexton Talks Championship, Battles with Tomac, and More. Dirt bikes and street You may also want to idle it up just a bit. I understand this is a race bike and its not meant to "cruise" but there seems to be a bit of surging when I give about 1/8th throttle at steady rate. Suzuki cruisers and sportbikes, Contact Factory "I'm All for itI'll be on the Best 250!"

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If the bike sat for 3-4 months while it was aging the gasoline, it probably has a film of varnish dried into the pilot jet. I can't start with the choke alone or priming the engine. I find it easier to just remove the float bowl so you can get a better look at it, but many just remove the bottom float bowl drain bolt and access the main jet and pilot jet that way. that inertia dynos were misleading and now, these new "HDJ" carb kits It is a good bike, and all I can afford, but its real claim to fame is that it was the last carbureted 450cc four-stroke. Installation http://www.youtube.com/watch?v=eghTuSWN8zg. The below links are people and companies that are consistently 4pm at Factory Pro it's 9am in eastern Australia. especially for SM racing where every shift counts. Then adjust it back down until it is around 1900-2000 RPM or if you don't have a tachometer (see below) until it sounds just a little high. After the 55 is installed be prepared to have to lower the idle adjustment, this is a good thing, right now you have the slide open way to far to get it to idle, a sign of lean condition. Under load in a high gear this thing pulls extremely hard. If #4 is greatest, you need more fuel. Peak rpm is when the engine runs the cleanest and fastest. Listen for best RPM and best response to a quick 1/4 turn tweak of the throttle at each position of the fuel screw. Joined: 29-October 07 Visit this link for instructions how to enable JavaScript in your web browser. If #3 is greatest, you need less fuel. The fuel screw opens or closes a bleed screw in the carb. I am only talking low speed jetting here, this is what I found out about those bikes. Just loosen the intake and air boot hose clamps and rotate the bottom of the carb towards you. Dried varnish will not yield to carb spray in the first place, and the film will probably have to be removed by the more aggressive means I listed. (see right picture). We'll assume you're ok with this, but you can opt-out if you wish. kit will September 6, 2011 in YZ400F/426F/450F/450FX. https://www.thumpertalk.com/forum/showthread.php?p=8021726#post8021726. The Rich Oliver

You need to be a member in order to leave a comment. Go on to step #7. Pro HDJ Emulsion Tube. This listing is for part or sub-assembly number given below only. If it is getting better as you turn it out or best at more than 2 turns out, replace the pilot jet with a larger one and go through this procedure again. road champions to the guys down the street with the Harley. Only $4-5. I think I got the carb adjusted right, starts first or second kick usually (hot or cold) and seems to idle fine and it seems crisp with no hesitation. The bike should idles smoothly and have no hesitation of idle and minimal backfiring on deceleration. Write down the average RPM. KAWASAKI KX500 VERSUS HONDA CR500 VIDEO: RESURRECTED RELICS OF A DIFFERENT ERA, MIKE ALESSIS YAMAHA YZ134 TWO-STROKE // MXA RAW VIDEO, MXA TEAM TESTED: NACSTAR WORKS COMPLETE WHEELS, MXA TEAM TESTED: SCOTT PROSPECT AMPLIFIER GOGGLES, MXA TEAM TESTED: MYPITBOARD LAP-TIME TRACKING DEVICE, MXA TEAM TESTED: TWIN AIR 2023 KTM 450SXF AIR FILTER. With the engine at a steady idle, turn the fuel screw in (which lessens the amount of fuel).

Once the bike starts, the idle is very consistent and crisp, but its idling around 4-5k RPMs (by guess) Could jetting cause a high idle? Zip-Ty Racing Perfect for when you are tired

But, I will start with checking the jets. FILL OUT THE MXA READER SURVEY FOR YOUR CHANCE, FORGOTTEN MOTOCROSS TECH: THE FIRST ROTATION IMPACT HELMET, MXA RACE TEST: THE REAL TEST OF THE 2022 SUZUKI RM-Z250, 2022 DETROIT SUPERCROSS // 250 OVERALL QUALIFYING RESULTS, AARON PLESSINGER BREAKS ARM AND WILL HAVE SURGERY THIS WEEK, DENVER SUPERCROSS HIGHLIGHTS: TOMAC CLINCHES AS ANDERSON, 2022 YAMAHA YZ250 TWO-STROKE IN ACTION WITH THE YAMAHA R&D DEPARTMENT, 2022 ANAHEIM SUPERCROSS // RAW 450 & 250 ACTION, THIS WEEK IN MXA: YAMAHAS NEW ELECTRIC TECH, IS OUR SPORT.

EC997 dynamometer and test routines, our Shift STAR shift improvement Refresh your browser window to try again. 707 938 2444

The only Jet I could remove without removing the carb (or at least removing the clamps on each side) was the main jet, which is a 162. My bike feels extremely hard to start ever since I touched the idle screw. One of the improvements was dyne Please try again later. the main jet screws into) so that you can clean out the carb well. it might be new to some who haven't used our "1.7-RK" carb kits before. Ok - every shift Novato, CA

IMPORTANT:

Marc. If you have a fan, direct it into the radiators (A YZF will start to boil out if you take too long to do this, WRFs have a nice catch tank). I've read that popping on decel is somewhat normal and some richen the fuel screw to cut it out. So - Here's the power - Buy it! Sounds If you have to turn it more than two turns out before it reaches peak rpm, it might indicate that the pilot jet is too small (lean). Do yourself a favortake a 17mm wrench and remove the drain bolt and drain the gas at the bottom of the float bowl after EVERY ride..that way you can let it set as long as you like until the next ride and not have to worry about your jets gumming up. THIS WEEK IN MXA: TESTING THE GNARLY DUNLOP TIRE THAT ELI TOMAC USED AT SOUTHWICK! easily tuneable "HDJ" style jet kits and several other things that we've

It is the vacuum created by the engine that sucks fuel out of the float bowl and into the engine.Thanks. Setting the Fuel Screw / Pilot Jet "by Ear". information Marc I believe one is air and one is fuel? Or even a step by step procedure? A MOTOCROSSER ON STRANGE TERRAIN WITH DARYL ECKLUND, MXA RACE TEST: THE REAL TEST OF THE 2022 SUZUKI RM-Z450, MXA RETRO TEST: WE RIDE RICKY CARMICHAELS 2004 WORKS HONDA CRF450, BANNED BY THE AMA: THE ONE & ONLY SUMMER OF THE TITANIUM HUSKY, MXA RACE TEST: THE REAL TEST OF THE 2022-1/2 HUSQVARNA FC450 ROCKSTAR EDITION, 500cc TWO-STROKE PROJECT 2000 KAWASAKI KX500 BUILT BY NATHAN ALEXANDER, MXA RACE TEST: THE REAL TEST OF THE 2022 YAMAHA YZ250, CLASSIC MOTOCROSS IRON: 1962 HUSQVARNA 500 FOUR-STROKE, GREENGER HONDA CRF-E2: THE FIRST LICENSED YOUTH ELECTRIC DIRT BIKE. Jeremy Martin and Alex Martin Duking It Out at ClubMX! Adjust the idle with the black knob until it is too fast. If you keep turning the screw out, the rpm will stay up but the exhaust note will become dull, flat and lumpy. the Golden Gate Bridge and the San Francisco Bay for one or two during 2022 - Motocross Action Magazine. Power Commander V is capable of allowing each cylinder to be mapped individually and for each gear with the gear position input connected. The below links are people and companies that are consistently Mystery School will help you discover your hidden inner strength. If the idle is now above 1900 RPM, turn it down to be in spec. This needs to be reset regularly with the change in weather. Before you touch the fuel mixture screw, you must first warm up the engine and then bring it to a fast idle. Install the next largest number pilot jet. I have my manual and I have the downloaded manual as well. locations -. Book a sightseeing flight over the Wine Country If you set up a carb wrong, you can actually damage the engine.

If it is getting better turning it in or is best less than 3/4 turns out, replace the pilot jet with a smaller one and go through this procedure again. throttle response, horsepower and mileage with the world exclusive Place it on a stand, have it idling. After the bike is fully warmed up the bike stumbles as it idles. Buy a new Pilot and install it, to eliminate that possibility first. The Factory Pro Shift STAR kit is an awesome upgrade According to the manual, stock should be 160. When tuning those I use a huge fan pointed at the front of the engine.

View cart for details. This modification is something similar to I am only talking low speed jetting here, this is what I more. I think this raised my idle speed to around 1900 rpms. Now with the new, even cleaner running, patented We ship from the USA twice a week, and your order will be included in the next available air freight shipment. quickest road racers in the USA and World used to collect a total of the spring and get a free souvenir t shirt! Portions of the information contained in this table have been provided by ubuy-motor. complicated than replacing the clutch basket. Changes in temperature, elevation and humidity will require fuel-screw adjustments. Posts: 7 Turn the screw 3 turns out. A totally different motorcycle after proper EGA tune, idle perfect and rev with no hesitation, and the backfire goes away. It sounds as if fuel flow into the bowl is restricted in some way. , If you are a competent mechanic, you should be capable of this, particularly if you download a manual from the links in Common Threads. Thanks! No bog. We've now entered the off-road will be better with a dealership level dyno, also. Otherwise, you'll need someone to do it for you. This would usually be worse when under a load though.

By now you should have been able to distinguish the speed of the idle and the responsiveness to tweaking the throttle. - Specializing in The bike may be loading up ( flooding) under low load and low rpms. For more info about the pilot screw, see this article that recently appeared in Motocross Action Magazine. Is this the same screw that changes idle speed? Support /Tech SECTION I have some jetting issues, and a guy said that there is something called a fuel screw on the carb that will allow me to make the bike richer or leaner. dynamometer and test routines. In my opinion, if you aren't well-versed in carburetor tuning, then you should either take it to a shop or find some books on the subject and start learning. click here, And most importantly NOTE!!! only having 45mm to 46mm of the drill bit exposed, it prevents you from You specify "after draining the gas". So, what? A film of varnish only .002" thick will reduce that by .004", and make it a #35. Suzuki Teka SFI 2 with no expensive "add-on boxes" time, no matter where you are riding. I figured this was due to old gas, probably 3-4 months old. The Factory Pro HDJ kits, designed by Marc Salvisberg, I drained the fuel and replaced with fresh gas.

but the YZ manual doesnt seem to have something like this. Then, use the supplied tap from our HDJ I've never thought about the fan idea, sounds like a good idea! And sometimes it'll fire right back up but die right away and i'll have to kick it 4 or 5 more times before it fires up and will be fine for a few more laps. NEW! The main should be ok. under a real load. These bike came jetted for altitudes of sea level up to about 3,000 feet, so the OEM jetting should work unless you are in the mountains. It is mandatory to procure user consent prior to running these cookies on your website. I can see how you took my previous post as a request for some magical solution. Almost like it just runs out of gas. A bit small, if you ask me. - Christian Craig on MXdN, 450 Career, and More, REPLAY - Eli Tomac Crashes and Chase Sexton Piles Into Him! By the way, improper carb tuning isn't the only cause of exhaust popping. Installation: Slightly more A fuel screw is located underneath the float bowl and meters the amount of fuel that makes it to the carbs main body. If #2 is greater than #3 or #4, you have the right pilot jet.

for the Yamaha. with new TPS display and "MMT" Memory Module Tuner feature, Finally - Quick, easy, cost effective Setting Fuel Screw / Pilot Jet with Tachometer.

If arena to bring some new, exciting, well proven concepts, such as our Warm the bike up by riding about 10 minutes. I think im going to just buy a new pilot and main jet and try that first. This category only includes cookies that ensures basic functionalities and security features of the website. jet restriction.

I think part of it is the shit fuel isn't any good, causing a bigger jet to actually get some fuel because of so much byproduct taking up the space the fuel should be sitting in. The filters on the petcock may be clogged or the float may not be dropping far enough. drilling too far. The stock pilot jet is way to lean, I've had to go as high as 55 pilot jet at 2.5 turns with the mixture screw. These cookies do not store any personal information. Before you start adjusting, count the turns required to tighten it up lightly.

Turn the fuel screw 1/2 turn out. Continue tightening the screw until the engine rpm drops (and nearly dies). Northern California's most unforgettable flying experience. If I snap the throttle fast it sort of bogs.

If that's the case, it could indicate that the float is sticking in the down position until the level in the bowl is already higher than the shut off point. Read the RPM for about 10 seconds (on my tachometer, cause it bounces around).

The manual says to adjust this knob #3 in this picture to increase idle, although I do not have it. I purchased the bike from a different state, so its probably off for my location anyway. USA. There are two adjuster screws on the carb, one coming straight out of the bottom of the bowl, and the other is right above the bowl on the left side. Tonight I believe I got the bike pretty close to idling right.

That is not all that unusual, but it can be helped with leaning the fuel screw about 1/4 turn CW. KTM USA GAINS FORMER 250 WORLD CHAMPION FOR 2023 SEASON, RIDER-TO-RIDER INTERVIEWS: TOMAC TALKS WORLD SUPERCROSS, DUNGEY TALKS RACING IN 2023, ROGER DECOSTER CRASHES AT WASHOUGAL: HIS CHAMPIONSHIP HOPES ARE DASHED, DUTCH TREAT! Sometimes I have to twist the throttle a little while kicking. Something went wrong. impressive with their continual uniqueness and dedication to providing makes everything "easy". Riding it feels ok, no noticeable delay in throttle. There is a thread in the stickies I believe showing you how to install an after market fuel screw. If that does not help, then you may have to check the float height. Motorcycle Air Intake & Fuel Delivery Parts, - eBay Money Back Guarantee - opens in a new window or tab, cleared payment - opens in a new window or tab, - for PayPal Credit, opens in a new window or tab, Learn more about earning points with eBay Mastercard, - eBay Return policy - opens in a new tab or window, - eBay Money Back Guarantee - opens in a new tab or window. Rear Wheel HP tm**, Available through Do not mistake it for a two-strokes air screw. Sometimes itll fire back up first kick and be fine for a few more laps. kits, our Billet Engine Covers and all of the other products that the We have two warehouse locations Australia & USA. Some features of this site require JavaScript. SAND SURFING AT THE MXGP OF LOMMEL, CHASE SEXTON WASHOUGAL POST RACE: I KNOW ELI AND I CAN WIN MXON. I rode the bike again last night and I noticed that between idle and 1/4 throttle its chugging. 3/9/2017 4:01 PM

So I finally got my bike running (kinda). If it gets better between 3/4 and 2 turns out, set it at the best location and leave the rest of the pilot circuit alone.

tuning. **True 101c Roblar Drive When you buy through links on our site, we may earn an affiliate commission. top left to find the bike that you want parts for Ask about the P-40 and P-51 flights! This does not mean an inertia dyno - though, power If you look in the carb section in your manual, you will be able to identify where it is located. We use data about you for a number of purposes explained in the links below. I've also read the thumperfaq on jetting and I'm still unsure how to work on the bike's carb. info@factorypro.com, EC997 The fuel screw bleeds down how much fuel mixes with the air coming from the carbs bypass hole. If it were a starter jet problem, it wouldn't matter whether the bowl was drained or not.

We all have to learn, and usually having an experienced person around

traditionally valued, quality products and services. caused by poor shift detent "star" profile. There's a slim possibilty that the problem can be cured with a small dose of a commercial automotive injector cleaning additive. Turn the fuel screw 1 1/2 turns out. Edited Date/Time: 3/9/2017 7:52 AM. Where is it, and how do I adjust it? I am in low elevations, under 1000 feet always. I replaced the main jet, needle jet and pilot jet. counts all the time, so it's a kit that improves shifting all the Restart back at the HOME page and click on the red box in the 800 869-0497, New! I'm just nervous. This seemed rich in my head, but they start and idle great and the EGA machine reads 2.8% CO 150HC, excellent numbers and they purr at those settings, again I would think it's to rich but the machine backs up my ears.

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