400ex mods horsepower

10. Jul 21, 2003 · 1. 440 big bore kit. This level of velocity makes it one of the fastest sport ATVs available on the market. That is why the diagram above has different ranges overlaping. Jan 31, 2013 · I would go with a web cam or a stage 2 hot cam. 11:1 compression piston. You can purchase this directly from your local Honda dealer and save money. 39K views 3 years ago #400ex #mods. So I asked a few people and they said that they were using the 400ex spindles. The stock shocks had seen their best days long ago and the overly narrow front Jun 30, 2012 · TRX2fiveO. i swapped out for a yosh rs-3 full pipe and fcr 39 to get the low end power back. The external resi on shocks is there just to hold more oil. 400ex trx400ex Feb 1, 2011 · Performance Modifications 400ex run cooler. TRX 300ex 450r 450er 400ex, and 250ex/x. A shock with a resi on it holds more oil than a shock without a resi, allowing the oil to stay Jul 31, 2003 · ATVs, Quads and Four-Wheelers. By conquering the Baja 1000 out of the gate, the Jan 8, 2021 · Honda 400ex In-Depth Guide The Honda 400EX is a 375lb all-terrain vehicle(ATV) manufactured by Honda Motors Company from 1999 until 2009. 7 posts · Joined 2016. Very easy to install. It was tuned to deliver an incredibly wide powerband with plenty of top-end pull. Factors like upgrading the air intake system, and exhaust system, rejetting the carburetor, optimizing tire pressure, using The 400EX on the other hand has very little gain in power from doing a mild port job with standard valves on a 416 motor or smaller. 07 416ex. Procedure Step 1. They are considerably bigger. It takes about an hour (minimum) to clean, dry, re-oil and allow the oil to wick and drain prior to being ready for use. Oct 23, 2012 · Performance Modifications 400ex air filter. . But what i want to know is that are CDI boxes even worth buying? Ive heard bikes blowing up because of this and i really want one because i heard it can give you better hp gain on top end and bottom end. #1 · Feb 28, 2010.  The mufflers will be roughly 4-6dB louder than the Jan 15, 2003 · G. Honda ATV Technical Discussions. honda400exrider123 · Registered. travishale84. porting and bigger valves help . The 400EX also sports a sturdy steel frame with removable sub-frame and exceptionally rigid cast aluminum swing-arms. When I started the first run it was only making 29HP NOT SHOWN. I dont want to put the 440 kit in, i want to do the 426. Im guessing a loss on bottom end but an increase on top end. Discussion Starter May 29, 2014 · Performance Modifications 400ex drag racing. Ok last time I posted a Dyno run I did with my nephews 400ex. If anyone wants to have this done give them a call.  The Full System adds another 5-10% more horse power while the MX system increases performance for high speed racing. je 11:1 piston. Mar 18, 2013 · 05 450R 07 KX250f -SOLD-03 YZ250 -SOLD-06 400EX -SOLD-06 Recon 06 Rancher 350 - Mar 31, 2007 · My 400. CT Racing offers many TRX400EX parts and accessories for your TRX400EX. Yeah, If you bump up the pilot jet, you will get more fuel from off idle to 1/4 throttle, if I remember correctly. Honda 400ex comparison400ex honda parts paso el 400ex mods400ex trx400ex. Offer full big bore motor packages, porting, and 5 angle valve jobs. When it was a new high-performance thumper nearly 30 years ago, the 1985–1986 Honda ATC350X was the biggest performance four-stroke three-wheeler around. 2 but excluding mods that do the same thing and are less updated/effective. It came to my shop with just a modded stock pipe, K&N air filter, minimal head porting and a stage 2 hot cam. Jump to 99 400ex mods: k&n airfilter HMF slip on exhaust itp front tires razr rear tires. This morning i did some distance to ATVs, Quads and Four-Wheelers. Aug 4, 2016 · TOM400ex Discussion starter. EHS racing outerwear filter for air box. I cant decide on the best system. 18. Also order a K&N filter charger kit for proper cleaning and oiling. stage 2 hotcams are very nice also. • The 397cc RFVC (tm) engine draws its breath from the same engine that powers the bulletproof XR400R. • Honda Racing-inspired graphics. Jump to Latest Follow 9K views Sep 26, 2002 · Unknown member Discussion starter. if you have a starter jet you have a carb made after 05' those jets are 120 main, 42 slow and 75 starter jet. when installing a hotcam stage 2 in a 2007 trx400ex do i just take off the spring and the pin for the decompression or i just take off the spring and let the pin there or just keep both of them there ? , thanks. Excellent Start Up Performance Mods. Oct 21, 2013 · 43 posts · Joined 2012. the stock 400ex tire size in the rear is 20x10x9, which is perfect for the 15t sprocket. Honda TRX450R 'San Felipe 250' Desert Build. Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!! You only need two tools in life -- WD-40 and duct tape. Jul 2, 2012 · The setup im running runs about $400 to $450 which is not bad for a full setup that has a litetime warrenty billet basket like a barnett. 1:1 compression ratio, and a displacement of 397-cm3 (24. #10 · Jan 8, 2010. To many mods to list in signature (ran out of space lol) Check out my showcase for full list. I know its for a 460 stroker but i want to try it in my 440EX. 35 × 2. • Twin air filter. The TRX400EX is a very simple machine that is great for longevity and decent in performance aspects, which makes Sep 25, 2013 · Performance Modifications. 3. There is more response and most likely a little added horsepower as well. stage 3 hot cam. the first is your tire size. Jan 7, 2010 · 300ex power by monster. Save Share. #2 · Aug 31, 2017. • The ultra-lightweight TRX400EX weighs only 375 pounds. His prices are also very reasonable. #1 · Oct 21, 2013. May 1, 2010 · Purpose: A nice increase in throttle response. Oct 22, 2012 · I want to put a Big bore in my 400ex. Plan B: Above plus 330 kit and 400ex carb. Sep 16, 2023 · The 400EX is powered by a four-stroke, air-cooled 397 cc engine with a power output of around 28 HP. Meaning they won't perform like they are suppose to. If it doesn't move and should, use the WD-40. If you need help with the exhaust tip PM me I have extra 1 1/2 stainless steel tubing left over. His turnaround time is un-believeable and his customer service is great. Industry leading 2 YEAR WARRANTY! Sep 4, 2015 · 400ex hd head stud comparisons. When the oil in your shocks heats up from riding, the shocks start to fade. Jun 6, 2009 · After much neglect, we thought it time to dust it off, pull it out of storage, and made our Honda 400EX a Project Quad. Mar 19, 2024 · 2005 honda 400ex + modsHonda 400ex – best way to increase your adrenaline 400ex honda upgrades buck bang dirtwheelsmagHonda 400ex 07 mods hmf exhaust. XplicitRacing6. Oct 1, 2023 · The Honda 400EX is renowned for its impressive top speed. Sportrax 400EX) is a pure-sport 4×4 responsible for the renaissance of the Sport-ATV segment. By positioning this “Bomb” at a key point in the system, increased performance and flow is achieved through the expansion and contraction of exhaust sonics through the system. Jump to Latest Follow 1 - 5 of 5 Posts. the terry thottle isn't that great to be honest. Oct 15, 2020 · If you opt for K&N - get two, that way you will have one to use while the other is being cleaned and oiled. either a 04 05 trx450r carb or a fcr. Mar 24, 2011 · The competition has 3 inserts for noise etc. Jul 29, 2015 · An fcr carb will complete the list for you. 4. "The redesigned PowerBomb incorporates FMF’s patented PowerBomb module. CR125 05-07 Mod Stage 2 | $1350. One thing i will say is get a clutch lever that is an EZ Pull style (like the longhorn i run (which is just a knock off ASV for 1/3 price)) otherwise the pull will give you arm pump after about 20 minutes or hard riding. When tuned right they will not overheat. #3 · Jul 22, 2003. 76 inches), a 9. Unknown member Discussion starter. Wear your gear, fool! Feb 2, 2014 · I'm not familiar enough with the 400ex mods to tell you which carb would work better as far as size goes. #1 · Oct 6, 2011. Sep 6, 2021 · With the mods you have described the peak HP might be raised to about 35 at appx 6000 to 9000 RPM. To meet emissions. I have a full exhaust, 450 carb, and K&N filter with outerwears and no airbox lid. #5 · Jul 1, 2002. 2383 posts · Joined 2009. Joined Jul 6, 2012 · 3 Posts. #19 · May 18, 2016. Helps it run cooler and helps keep your engine alive a lot longer. Boasting a 397-cc XR400R-inspired engine, Pro-Link rear suspension, 72-mph top-speed rating, and aggressive styling, the quad continues to ride high in today’s ATV market. . Is there anything else i could do that would increase the performance of the bike without go Aug 5, 2010 · 66 posts · Joined 2010. Sep 11, 2006 · 4th 40 pilot jet and 155 main (elevation 800 feet) (stock jetting is 38/150) 5th 13 tooth counter sprocket (Stock 05 is 14 tooth) (The stock 04 CS is 15T so drop it to 14) Total cost of mods $75. The pilot fuel screw on the 400ex carb is there to fine tune the amount of fuel/air at idle and under 1/4 throttle. Slow = #38. Re-jetting the slow jet richer and a few stabs of the throttle will compensate for removal of the choke. I jetted it in with the stock pipe and gained 1HP taking it to 31HP. -Set up notes on timing and jetting. DRI 4-Stroke Bolt-on Kits are designed to provide the maximum horsepower increase while preserving reliability. Apr 25, 2011 · The 450 shocks will be a huge upgrade over the 400EX shocks. if you have bigger tire size like 21x10 or 22x9 you will loose bottom end and gain top end. Apr 25, 2024 · The Thrilling Top Speed of the Honda 400EX. The price was a whopping $5500! In 2000 the carburetor boot is upgraded to prevent cracking. At the heart of the Honda 400EX’s speed prowess lies its powerful 28-horsepower engine. It has a 28 horsepower engine and the Honda 400EX has a top speed of 72 MPH. Our Price: $58. So with gearing changes you might achieve 50 BHP at the rear wheels. hotcams stage 2 cam. Come join the discussion about performance, modifications, repairs, troubleshooting, maintenance, and more! Open to all models including the ltz 400, raptor 660, eiger 400, ltz 250, and raptor 350. 2002 TRX400EX. P&P head. Check it out guys after we got done with Quad Warz i wanted to pass Feb 21, 2009 · The Motoworks exhaust looks good, weighs less and gives more torque and horsepower from top to bottom on the powerband. GDH Racing provides all used, pre owned ATV parts, accessories, aftermarket and service for Honda ATV quads. Apr 5, 2004 · The 400ex throttle is a little longer and much closer to the bars than the stocker. I recently picked up a stage 3 hotcam for cheap. ported and polished with valve job. 1 month later Feb 28, 2010 · 32 posts · Joined 2009. HMF claims that their Performance slip-on is best all around, giving you gains in low-mid-high. I have had my 02 400ex for about 6 months now and feel i have gotten to know the beast. I have been noticing on some bikes,250R`s, that the spindles appeared to be different. Jan 3, 2010 · 426ex. Jan 4, 2011 · 400ex motor mods MX Capable Jump to Latest Follow 17K views 26 replies 7 participants last post by 400exrider15 Jan 6, 2011 Oct 28, 2011 · Biggest gains are from installing a aftermarket cam ( stage 2 hotvams are nice) and a bigger carb ( ones from a 04 05 trx450r are cheap) These are going to give you the biggest gains in power and wont hurt reliability at all. Honda introduces the 1999 TRX400ex Fourtrax in 1998! The engine was basically derived from the XR400 motocross, enduro, trail, street, dirt bike. Welcome to the forums. Feb 5, 2016 · A forum community dedicated to all Suzuki ATV owners and enthusiasts. 1995 300 fourtrax with bear claws , 420 front spindles and hubs , 400ex calipers. It also comes with the most colors and options. -Head Mods. Like its older brother, the 400EX, the Honda 300 has a torquey, air-cooled engine. 49. 94mm J&E piston, +4mm hotrods crank, 536webb cams,wiseco valves, 39mm fcr, tokyo mods throttle spring, honda thumb throttle,spring removed. i also would like to build a stroker motor for mine. 1987_250x. Each series Slip On exhaust picks up 10-15% more horse power and torque throughout the power curve. --------. Remove the rear fender, front fender, gas tank, air boot, and anything else that is needed to be removed to access/remove the carb. Here's an ATV that feels closer to the Raptor's 350cc than the 300 it's equipped with. And there's a definate power gain. for a 400ex application head flow os smaller than a 450 but you have increased airflow from the airbox to the head. 00. do an extra oil cooler mod if you do bore it. com ATV Enthusiast Community. 5K subscribers. "YOU AREN'T FINISHED WHEN YOU LOSE YOUR FINISHED WHEN YOU QUIT. I know the stock carb bore was 42. The unmodified XR250 box will give you about 800 more rpm on top and a faster ignition curve. This torque played an important role in chugging us around, and more than one tester was surprised to find it was "only" a 300. I have done some research, its the last reliable bore before i need to Re-sleeve, with 11:1 Aug 9, 2022 · The 2007 Honda TRX 400EX comes to life via an electric starting system and an air-cooled, single-cylinder 4-stroke RFVC (Radial Four-Valve Combustion Chamber) power mill. It, like nearly all three-wheelers of the time, was more of a serious sport machine for the trail than a racer. com i read something abt xr400 motor and bikes having free mods, well im wondering what does the 400ex have? i know it wont gain a huge amount, but just curious is to what i can and should do before i spend some hard earned $$$ on it, which i will be happy to spend some $$$ to Jun 25, 2002 · Vtr_Racing Discussion starter. For most trail riders, the stock head will work fine. Our starter package for the CR125 improves response and power everywhere. I trail ride 99% of the time, so i need it to be 96db or lower to be legal around here. 400ex top mods. Triple disc brakes provide much needed stopping power and an Jul 19, 2012 · 99 honda 400ex. Plan A: Pipe, stage 1 hot cam, air filter, dynajet kit. In the video i had the oem header also. Mar 7, 2015 · Instead of finding a pricier used 450, we found a Honda TRX400 on Craigslist for $1200 that was perfect for this budget build. Feb 13, 2012 · The best mods for EXs are cams, carbs, bores, Valves, jetting, timing keys, pipes, bars, nerfs, shocks and spal fans. Interview: jarrod mcclure2001 honda 400ex $4,750 2007 other 400ex honda listing classifieds atvs description custom400ex atvriders riders atv. they help alot. • Aluminum air box with battery relocation. 18211 posts · Joined 2009. Oct 27, 2012 · 5. Who will win? #Honda, #Suzuki, #QuadRace, Sep 9, 2008 · before i changed out my ct sonic pipe and my fcr 41 my motor was making 52 hp on the dyno. This compact powerplant utilized lightweight aluminum construction and a forged piston. If you wanna keep it simple and have a decent ride Id get 450r shocks, 450r carb, timing key, a decent slipon and let it ride. Jan 7, 2024 · All-in-one mod that improves performance, reduces memory usage, and fixes many bugs. a. local shop was able to test one out for free and they still prefered the ex thottle. Sep 6, 2008 · honda 400ex motor bored out to a 440. Jul 5, 2012 · Performance Modifications. LRD full system pipe. Ive tried many different exhausts and the stock header is actually built pretty well because I havnt noticed much gain with aftermarket headers in my opinion on 400exs . 460 maybe, also you should keep the compression aroun 11 to 1 to be safe for all day riding and woods riding May 4, 2023 · 400ex air trx400ex honda shrouds performance scoop parts trx cooler cfm engine kit 2040400ex honda Honda 400ex help atv atvconnection thanks forums replyGetting the honda 400ex going. 2007 LTZ 400. May 16, 2016 · 4390 posts · Joined 2010. 42. Improved throttle response and spark energy, Plug & Play, Replaces your stock CDI, Installs in minutes. I am very happy with my stage 2 cam but want to see what kind of difference there is. #2 · Aug 5, 2010. The honda is an oldie but boy do we have some special work for them! CR125 02-07 Mod Stage 1 | $500. It only comes in black (I think). Result is a flow increase of nearly 10%! Jul 21, 2016 · On Jul 21, 2016. esr intake. Includes:Complete Fat Boy 4 Exhaust System (with STD Muffler), Jet Kit, Pro Flow Air Cleaner Kit (Pro Flow flange, K&N, Outerwear) Power Gains: 5HP+. Sparks timing key makes them run hotter than they already do. However, speed can vary depending on factors such as rider weight, terrain, and Jan 19, 2024 · Honda 400EX Engine Performance Specs. You can fell improvement all through the powerband. Our Price: $64. Also any guidance on the re jetting would be helpful. there are 2 main factors you have to watch when dropping or adding teeth on your sprocket size. Like Oct 7, 2011 · 1784 posts · Joined 2011. Jetted to run with all these mods. 42mm 05trx450r carb with ported boot. Im pretty sure those are the main mods beside a cam you want for a big bore. 2001. Apr 8, 2013 · Thanks. Step 2. But not really much difference. May 7, 2021 · Top 5 BEST HONDA 400EX PERFORMANCE MODS!!! Stupid Fast John. Jun 27, 2021 · I ride my 2004 Suzuki LTZ400 and Chuck rides my 1999 Honda 400ex as we race to see which machine is really faster. but with a web cam you need hardened rockers and a hot cam you don't need that you use all your stock stuff if you want. Feb 14, 2022 · Hey guys i just got a 08 trx 400 and am thinking of putting some mods on it, looking at a new exhaust and most likely will open up the air box, i know i will have to re jet and everything. Jul 16, 2010 · Stock jet sizes for the 400EX is as follows: Main = #148. yoshimura full exhaust, honda 400ex intake tube, no air box. It made a huge difference. 73M downloads. Jump to Latest 99 400ex mods: k&n airfilter HMF slip on exhaust itp front tires razr rear tires. Increase your Top end. Doesnt get any easier than that. Im assuming it has a high comp piston in it so lets say 13:1 maybe more? Idk whats a common compression on these? Full trinity racing exhaust Stock carb Stock Airbox with lid on and k&n filter Its has to be running incredibly lean with stock jetting on stock motor to these mods. A spark arrester is also included if needed. 1 piston! uni air filter May 18, 2007 · ok not to sound cheap, cuz im not and will drop money into the 400ex to gain some power and speed, but on thumpertalk. The Honda Motors Company introduced the remarkable Honda 400EX, an all-terrain vehicle (ATV) that made its debut in 1999 and continued to captivate enthusiasts until 2009. It's alot more responsive now. The engine provides plenty of low-end torque to motor riders around wooded areas, trails, or deserts. • FMF power core 4 exhaust. I think this is the most affordable option to really upgrade the 400's suspension. Enthusiasts seeking more speed have ventured into modifications, pushing the top speed beyond 70 mph. Honda 400ex photos. Apr 30, 2014 · Performance Modifications TRX400EX, TRX400X, XR400R Stock & Performance After Market Cam Specs(Sticky Maybe) 2000_400EX_Build 400EX_Pivot_Bolt_ Save Share. 400ex upgrades. Jan 23, 2013 · The FMF Power Bomb propaganda says. You'll notice the difference. I was riding with my cousins this weekend and they have a pair of 400ex's and i was courious to see the power difference from there 400's to my 450. 400ex mods. This air-cooled, four-stroke powerplant propels the ATV to an exhilarating top speed of 72 MPH, making it one of the fastest quads in its class. This combo is truly incredible for a 125cc engine at an even Jan 25, 2011 · Performance Modifications 400ex air filter problem!??! Jump to Latest 99 400ex mods: k&n airfilter HMF slip on exhaust itp front tires razr rear tires. 99 honda 400ex. Besides the rev limit which is scary to hear these engines push those Rpms anyway. i had a 426 on mine then went to a 440 and seamed to loose a little low end. Now for an actual comparison, the BHP (braking horsepower) of a stock 400EX will be higher than the 28 crankshaft HP of the engine. The Honda 400EX achieves a top speed of approximately 65 to 68 mph in its stock configuration. Jump to 2001 400ex mods 440 big bore! cobra full exhaust nerf bars tag front bumper 11. Jump to 2008 400ex (will give 450's a run for their money!!) 87mm (416cc) wiseco forged piston 10:1 stage 1 hotcam Dec 16, 2017 · 400ex Modded Subframe. It has a bore-stroke ratio of 85 × 70 mm (3. At Dirt Wheels, we have seen a resurgence of riders restoring Jul 27, 2023 · The 2004 Honda 400EX (a. About 2 months ago I added a K&N, jetting and white brothers R4 series pipe to my 400ex. BACK IN ACTION One area where the Honda 400EX could definitely use some help, especially on our older 2003 model, was in the suspension department. Long story short its going 416 so i want to Dec 13, 2010 · Jetting help 400ex. Mar 1, 2018 · Yeah 400ex's only over heat when people dont know how to tune them properly. 03 honda 400ex help - ATVConnection. 2226 posts · Joined 2002. To start off this project, we connected with Rocky Mountain ATV/MC for most of the parts on the build. If you use the stage 3, it gives you the most HP, but is the loudest. The star of the show is the 400EX’s 397cc air-cooled single-cylinder four-stroke engine. So i was looking for a way to beef up the performance on there bikes and was thinking the green wire mod is a good Apr 26, 2011 · Performance Modifications 300ex mods. The seat says "Fourtrax" in 1999 and 2000. The carb on the 400ex is a pumper style carb so you can shoot a little gas into the carb upon a cold start. With a stock configuration, this quad can easily reach speeds of up to 70 miles per hour (112) kilometers per hour). Sep 7, 2009 · Purpose: A nice increase in throttle response. So the anticipation is over and i got my subframe back from Mud Motorsports. To put this speed into perspective, let’s compare it to some of Aug 27, 2023 · Honda 400EX Top Speed. A 38-mm Keihin carburetor supplements Feb 19, 2010 · This is all on my 05 400 and it's pretty awesome If you do bore ht e 400 you will have heating problems to wear you dwon't even wanna put your legs next to the bike. 1338. i would suggest picking up 450 front shocks and send all three off to get revalved, resprung for your weight. Compatible with all your favorite performance mods! Client or server Optimization Utility Fabric Forge NeoForge. Product Information: S-1 Kit #BK4-4000 $779. NEWS PARTS JEEP & 4x4 ATV & UTV A mod/plugin that optimizes big server resource packs! Performance mods for >=1. 400EX MOTOSPORT NERF BARS 99-14. #3 · Jan 16, 2003. Jun 4, 2011 · Ok i have a 99 400ex in really good shape the mods are HMF slip on exhaust, k&n airfilter, 416 big bore kit, and thats really it. Feb 24, 2009 · Honda TRX300EX. i would look at CT racing and see which one they recommend on their page. You won't see a difference until you get into a 440 engine or bigger going to a big valve head on this one. Jul 19, 2011 · Many aftermarket CDI boxes sold for the 400EX are actually stock Honda XR250R boxes. This quad featured a robust 28 horsepower engine that powered it to an impressive top speed of 72 MPH, delivering a thrilling experience for riders. I had the 450 fronts on mine and it was a huge improvement and they didnt have any work done to them. I have been tossing around the idea of either widening it or going with a bore kit. Like. #1 · Aug 4, 2016. k. Performance ATV Mods. 5 on the 400ex, but the 39mm imo is more than enough for a 400cc engine because the stocker is a butterfly type carb,,,big difference to a flatslide carb. Apr 20, 2010 · The highly acclaimed Sportrax (tm) 400EX dominates the competition with outstanding performance and handling. 2004 Honda Sportrax 400EX pictures, prices, information, and specifications. The Top speed of a Honda 400EX ATV (All-Terrain Vehicle) typically ranges between 65 to 70 miles per hour (105 to 113 kilometers per hour) depending on factors such as rider weight, terrain, and any modifications made to the vehicle. - View the collection Modern Performance [Fabric] by mateus3c on Modrinth. NEWS PARTS JEEP & 4x4 ATV & UTV Apr 24, 2009 · 400ex bore kits. #2 · Sep 26, 2002. 524 posts · Joined 2002. i have owned both and the 400ex was a good quad in its day. It is crazy that 50cc's make such a difference in power. Quote. 791. curtis sparks x6 full exhaust. Hi everyone i am new and posted what i have in the intro thread. I am in North OC. Dec 11, 2023 · Honda 400EX Top Speed. ok the 04' 450r carb jetting is 118 main and 48 slow. Removal of the choke allows for a better flow through the carburetor. Just wondering what are the best exhaust and intake mods (best bang for my buck). #6 · Jul 1, 2012. -Cylinder porting stage 1. if u put the 400ex a ams on and use 300ex shocks u sit about as low as red in the front and i rilly bad need skid plates for 400ex a-arms cuz mine are getting beat up from rocks. Jun 14, 2011 · bigger carb for sure. Hi guys, I just recently purchased my 2007 400ex. $500 to 900 depending on the pipe. I have to give a big thanks to Josh. Dec 22, 2008 · Green Wire Mod for 400ex. Feb 16, 2010 · 23587 posts · Joined 2009. A 38 mm Keihin carburetor feeds the air-fuel mixture into the radial four-valve combustion chamber. So I looked at mine and compared them to the 400ex. I had a big gun cdi custom mapped by bills on my old 400 and it didn't seem to make much if any difference. as Honda TRX400ex CDI Rev Box. • FMF power bomb header. Put the 42 slow jet in and you might want to get a 170 main the 158 might be too lean with no lid. Nov 6, 2013 · 426 to 440 in my opinion the 426 revs quicker, but 440 stays on top longer . Just unscrew your housing from the cable, and install the ex throttle. The Velocity filter kit includes the flange, high-flow filter and pre-filter cover for protection. 92 honda 250x. The Honda TRX 400EX is available as a Slip-On, Full, and MX System in the Performance and Competition exhausts. Check Details. I feel you must get to know your machine before you know what to modify on it. Performance Modifications Aug 30, 2017 · 559 posts · Joined 2016. 04 450r carb. Order: CDI for Honda XR 250 1992-2004 Part #30410-KCE-671. Apr 10, 2024 · Top speed of Honda 400EX. They do come from the factory with a lean tune. 1,616 followers. above + $600 getting spendy now. I live @ 3,200, everything goes up from there 8000 on the upper end. Dec 7, 2013 · High Point ATVMX National Race Report. My stock bore 400ex is finally starting to show some signs of oil burning. But it also has a small effect on all ranges of the carburetor. 23 in3). I have a 02 400ex with stage two hot cams, port and polished head, 11:1 Wiesco high compression piston, open air box with k&n filter and i run it with 110 race fuel. #23 · Feb 17, 2010. have not run it on the dyno but i can tell you 100% sure a z will out run a 400ex mod for mod all day long. I have seen some 440s and heard of them not going so well, the gains arent too impressive, john (yzroostinya) and my local mechanic both agree the 416 is best way to go, staying safe, costing less, and seeing the gains you want, which are surprising. I am new to the forums, and I had some questions about aftermarket exhaust. 2008 Honda TRX™ 400EX pictures, prices, information, and specifications. However, it’s important to always ride safely and within legal speed limits. And never really seen that perticular cdi in action. Not surprised since im off the rev limiter almost religously (and the previous owner changed the oil probably a total of one time with car oil) so i expect it isnt going to take that for ever. I have one on my 400ex and it's great! Let's you put more oil in so it can sit in the tank longer to cool down. fd yz xt er bb aw dz sz ql wq