400ex bogging. My Problem: It starts and idles very well. It cranks and cranks and cranks but doesn’t start. For fine tuning your 400 you can do a spark plug check. Oct 3, 2025 · I buy a 2004 Honda 400ex that bogs badly. It sat for about 2 weeks and I bought a new battery for it and installed it. more I have an 02 400ex and it hasnt been running right, it seems like its starving for fuel but i cant figure out whats wrong. 1 wiseco piston with a 165 main and pretty sure 45 pilot with holes in the air box lid and have a bog at full throttle only. The next time it didnt. It will start up and idle just fine I can rev it up and everything but when I go to ride it I can get about 50 feet before it starts bogging down like it's not getting any fuel and hello guys i new to the forum i have a 400ex my problem is its bogging when you just cruise and then pin the throttle it will bog or hesitates to take a quick rev it has a fmf pipe keihin fcr37 carb 175main and 50pilot fuel screw 2 turns out and choke removed any help appreciated thanks guys oh and taking off the air box lid make no difference I have a 2005 400ex with white brothers full exhaust and air filter. The lowend power is where the 400ex really excels so your hard pressed to bog it out. It had a cobra pipe on it but it broke off and I ran it w/o a pipe for a couple days and it started acting up a day before it broke offit will run decent if i turn the Bogging Honda 400ex Quad Can't Be Fixed (I Regret Buying This) 2vintage 649K subscribers Subscribe Hey has anybody out there heard of putting the carb off a 400ex to an xr 400, I think the quad has a accelerator pump on it?. it idles great and will go full throttle off idle fine but once it reaches about half way through the rpm range it starts sputtering/bogging and takes a couple seconds to come back. 300ex bogging/stalling I have a stock 300ex 1993 model. It goes great up until I’m going high speeds in 4th or fifth gear. I ride predominantly trails and hill climbs. Problem existed before and after jet kit. These ATVs are getting older now, and that accelerator pump diaphragm gets stiff and stops working properly over time. I am wondering if possibly an adjustment on the carb got tweaked from being apart for 4 years. i have a 400ex that hard starting and the quad Boggs when applying the throttle and it worse when ridding I had the quad a 3 different shops and the get it running good but if u let it sit its goes back to bogging all the time Hey, so I got my 2005 400ex out for the first time in a few years and I’m running into some idle issues. ive tried all sorts of jetting Jul 24, 2012 · 02 400ex Bogging out - FIXED! I need some help, I just got a 02 400ex and with the choke off when you give it a decent amount of gas it bogs out and wants to stall. But today I took it down the road full throttle, and at top speed, I pulled in the clutch and stoped giving it gas and it dies. 2mm over stock bore. The carb is clean, no intake leaks, mixture screw is 2. Has full pipe uni foam filter and airbox mod. com/themarcustree/https://twitter. However this spring I have been noticing that my 400ex has lost a lot of its pep and when you are in third, fourth, and fifth gear hitting it hard it tends to bog out. when i got the atv it had a 40cc big bore kit but i went back stock because it was knocking. And if i keep it running with choke off, when i give it gas, it wants to bog bad and fall on its face. But if your trying to ride it bogs. but when i put to where the chokes offit will bog and wanna die. Did the same thing with 155 main. Only thing changed were rear tires. when I start it up it idles fine, and when I give it throttle it is fine. It So my 400ex had a dead battery for about 2 months and I would jump start it whenever I wanted to ride. The only way to avoid it bogging is to very slowly ease on the throttle, but even then it still bogs a bit. Returned home and remove air filter, ran a little better. Ported rebuilt head bought from je Honda. I have already checked the carb for trash and it is clean. I started it again and it idled but would die if I revved it a li In this video, we use a Garmin inSearch Mini to test the top speed on this bored 440ex. 42 pilot 162 Main. instagram. Carb tuning guide for all Honda 400ex I have a 99 400ex, all stock. still very reliable but makes great power. In this article, we will investigate the most common issues raised by Honda 400EX owners and show you ways how you can go around the issues. It ran great at first but after around 10 minutes of riding, I came to stop and it started bogging down and shut off. its got a k&n air filter and t 4 exhaust. It broke last week I was riding down the road in the snow and had it pinned out 5th gear and all of the sudden the motor started bogging out then started clickin' and clankin' and shut off and wouldn't fire. The problem I am having is that the quad will run fine in 1st, 2nd, and 3rd gears. Haven't ridden this one much, last 2 rides have had an issue. Was told its all original. can someone tell me the problem? In your case the stock 148 is slightly lean for a stock machine anyhow, so changing it to a 150, or a half size higher would probably make it better depending on conditions. The Unless its bogging out and losing speed your good. When it dosent want to bog out and it accelerates without bogging I think I can feel that midrange power is lacking slightly. #Honda, #400ex, #Fix, SUBSCRIBE: / @2vintage MY SECOND CHANNEL: • New Polaris ATV Snow Plow Setup!!! ADD ME ON ALL SOCIAL MEDIA FACEBOOK Dec 10, 2021 · Hello people smarter than myself, I've been having some issues with my carb the last couple times I have gone riding, when I stab the throttle cold or warm it bogs down bad and wants to die on me ,my quad is completely stock other than removal of the spark arrestor, my thought was maybe I needed Out of the factory, the pilot screw is set perfectly and no adjustments are needed, you’ll likely only need to adjust it if you’re going to ride your ATV in high altitude region, have replaced the screw previously or you’ve made modifications to the engine. Adding a slip on and leaving a lid on would not need to be bumped up too much as its not taking in anymore air than it was before, and you have a Q4 which is not a race core anyhow, so you could use a 155mj as a starting Tags carburetor running prob start problem trottle Jump to Latest 2K views 1 reply 2 participants last post by BigFatDustin Apr 20, 2021 C Cric Discussion starter 1 post · Joined 2019 #1 ·Sep 25, 2019 I dont remember it ever doing this. remove airbox lid, replaced with uni air filter, put new hmf My husband has a 2006 Honda Rincon ATV. It is a 675. Any suggestions on what Jet sizes I I recently purchased an 07 400ex with an kcm slip on pipe and a kn air filter with a drilled air box lid can anyone guide me to the correct size jets for the carb Performance gains means tweaking the carb. I also noticed it bogging a little in Hello, I was recently feeling nostalgic and picked up a 2003 400ex. i have done everything i can it just wont quit. So I was riding a friends track, and when I hit one of the many gap jumps, wind out second gear, hit third and accelerating, then hit jump. 00 400ex bogging out past 1/4 throttle Jump to Latest 3. i drained the gas and changed the spark plugs and the bike fires right up and also idles out but when i hit the throttle it jus bogs out and dies. after a couple rides i noticed the following issues: struggles when shifting down to 1st or just at low RPMs in general, it will die if i don't ride the throttle or keep it at higher RPM while I have a 2002 Honda 400ex. I have a new to me '07 400EX (Just bought it 8/20/17) It has a Sparks full exhaust system, and is supposed to be correctly jetted. 2004 trx400ex with more hours invested into trying to fix this issue than I care to admit. 3K views 6 replies 4 participants last post by Dust1014 Jun 17, 2014 ray10147 Discussion starter [SIZE=1][FONT=Arial]HI, My name is Brandon and I own two quads now a 2000 400ex and a 2004 450r. 2K views 1 reply 1 participant last post by My quad 400ex Aug 9, 2021 My quad 400ex Discussion starter Tino55 Discussion Starter· #3 ·Nov 10, 2013 i have a 172 size jet in now 09 Honda recon 250es dunlop tires, gun racks 09 Honda Foreman 500es kenda executioners 2013 honda rincon 680 kfi winch 2004 400ex white bros exhaust dg bumper race cut plastics ac nerf bars k and n filter houser a arms Reply Save Like 2004 400EX TT Style- 440 big bore, big gun over rev CDI, big gun race can, fmf powerbomb header, ported polished head, stage one hotcam racing cam, edlbrock racing carb, +2 +1 a-arms, elka stage 2 fronts, durablue sway bar, gforce racing rear axle, and a lil bit of:bling: Is your ATV wheezing and bogging down every time you try to take it out for a spin? Particularly, when applying the throttle? Just a 30-second online search would assure you that you’re not the first person to experience this scenario. Turns out it will not idle without choke and while driving it’ll bog at full throttle. have gone about cleaning the pet cock and carb and switches cdis, also tried different gas thinking that would be 2006 Honda 400EX Bogging Out Between 1/2 and Full Throttle Issue 400EX often faces bogging under load and inconsistent throttle response during gear shifts or full throttle. I've heard good things about the site. Then it does something similar to a car when it reaches its top speed, it bogs down and slows me down and occasionally kills it. I have only drove the quad around a little, seems to be fine. You need to check the adjustment on the accelerator pump linkage and the operation of the check valves in the accel pump circuit. and then it started bogging down real hard and i heard a loud noise from my quads engine. I’d like to preface by saying that the only things that’s been recently done to it has been a carb clean, a new battery, and I checked the valve clearance and spark plug. I can run it for quite some time until it gets warm/hot. Now it seems to start and run finejust has about half the power of my buddys 400ex. Yesterday I purchased a 2000 Honda 400ex from PA. I'm trying to save some money on buying the mikuni pumper tm-36. it also has a new plug. This can be changed by following these few simple steps. 440 is as big as you can go with out a stroker crank. The backfiring isn't very bad but its definitely noticable. We took it out to an open area where we could open it up and it would bog hard if you got on it. You should be able to get some pretty good spin on those 4 snows in that sand but that's a big tire to turn. It has set a couple of weeks since last rode, and it was running fine. but when i pushed in the accelarator i noticed my quad wasnt going any faster. but once I get to higher speeds, and mostly in 5th gear it will run fine for a We assumed it needed jetting so messed with that quite a bit and got rid of the slight bog it had. hey im new to the honda game and i just put on a brand new carb on this 01 400ex i got from a friend. it will run about 63 max which is quite slow for my 440. The first three times it ran perfect. Let's fix it. unless somebody has one out there for a good price? i was riding my 99' 400ex and it bogged right out, so i pulled it apart at find that the timing chain came off the crank shaft so today i decided to time it. It has been "bogging" down when shifting from lower to higher geers and does not want to run correctly. 2K views 3 replies 4 participants last post by scootstah Dec 9, 2014 L Alright so I have a 2003 400ex I just rebuilt the whole top end and now it bogs down like it's running out of gas. it sputters like it is hitting a limiter, just falls on its face. If you took it easy it would get up to almost WOT sometimes bogging, sometimes not. I went to go trail ride and I pinned it down the road to feel it's power on the way. 400ex Jetted now Bogging??? Jump to Latest 7. Too lean? Today I was out riding and my friends new to him 02' 400ex would bog down on the trails when giving it gas in 2nd and 3rd. Got it from an older gentleman that had definitely babied it most of its life therefore I thought I found a gem. WOT works normal. There doesn't seem to be any rhyme or reason to it, it's very 400EX bogging Jump to Latest 3K views 5 replies 3 participants last post by cisco450er Mar 23, 2010 cisco450er Discussion starter 400ex bogs on acceleration. If your Honda TRX 400EX is feeling sluggish or bogging down when you hit the throttle, this Tusk accelerator pump rebuild kit will probably fix it. and we decided to gun it. It currently has some bad valve stem seals and burns a lil oil (getting fixed tomorrow), but it runs perfect up Obviously you bog with the 15 so try dropping to 14. It seems like it is running out of fuel at an @11:00 angle? I can clutch it up into a wheelie no problem, but after about 10 feet, any throttle input just sounds like "buh-buh-buh-buh", and has none 400 EX bog out 3/4 of a throttle with a brand new carburetor Jump to Latest 1. I have an 02 400ex that has just started running like crap. Here’s the step by step process of adjusting the pilot screw – If your engine is not idling, Oct 19, 2021 · i have a 2001 honda 400ex that i am experiencing a bog like problem at higher rpm . Also I notice when I go to Have an 08 400ex, been 20 years since I've done any riding. All stock engine except for a replaced timing chain. it has no low end torqe what so ever. Oct 12, 2016 · I could change the main in my 400ex in a couple minutes, take the 17mm bolt out of the carb then put a short 6. Dear ATVC: I have a 2004 Honda 400EX and I’m getting a RS3 Yoshimura full system from someone that used it on a 400ex before me and I am not sure how to figure out what jetting I need for it to run good. when i had the carb apart i didnt see a c-clip on the needle but notices the needle jet looks adjustable can that be adjusted for the bigger jets. (Video below) With the choke on (closed) it will start and idle fine, but when I move the choke off the rpm’s will increase and then start to bog down and die. yoshimura full exhaust, honda 400ex intake tube, no air box If you own a 400ex, you know it's power is not up to par with the new 450's. I just rebuilt it and put a new Wiseco 11:1 Piston, stage 2 hotcam, and a full yoshimura exhaust in it. 1K views 4 replies 2 participants last post by FullThrottleRiders Dec 9, 2021 Hey guys, more of just a common question but based on my 400ex- anyone have a top end bog no matter what you do to it? not sure where to go with my 400, 3 issues left that are a possibility jetting, CDI box, or a coil My 400 will run great until 4th and 5th pinned for a while. It's been well over a year of trying b 400EX parts The broken tube (missing hose) is the float bowl vent - it went up over the top of the carb and the end of the hose pushed into a hole in the splash guard behind the fuel tank The other piece (#11) is the idle speed adjustment screw The bog can also be affected by the fuel level in the float bowl. i put a new carb with stock jets. Has some aftermarket bolt-on's and a white brothers E-series slip on. 6K views 6 replies 6 participants last post by fl06450r Mar 7, 2006 B Honda 400ex used to run great then started to bog down and would bog down everytime I went more than 1/4 throttle doesn’t leak or anything but don’t have the time to mess with it price is obo open to So I bought a 2000 400ex about a month or two ago, fixed the major issues and the bike was running fine for about a week. Step 1: First, you need a new piston and camshaft. Cyberpunk Futuristic File Icon Background video | Footage | Screensaver Bogging Honda 400ex Quad Can't Be Fixed (I Regret Buying This) The Motorcycle Community is DYING - Here's Why | CycleCruza So i just bought a 2003 400ex. I found a real gem with very low hours. its been rejetted. When i put it to half choke it runs without a problem. The bike will rev smooth as long as your not moving( in gear or in neutral). Otherwise, I believe it is stock. the bike was bored out to a 440 any suggestions I have a 2007 400ex Curtis sparks slip on and header 11. I’ve I bought a 400ex that needed some work. today had it and the 450 at the track and it kept bogging down real bad almost died a few times all it has done is the uni foam filter and a fmf slip on,does it need to be rejetted or just Hello, New to the forums. it was bone stock when i got it so here's what i did and i was hoping to get some feedback on the needle and any other carb adjustments you guys feel are neccessary. When choosing the piston be careful not to get to high of a Hi I'm new on hear. Featherin Hey guys hopefully someone can help me . What can we try to fix the ATV with? we have replaced the tps Then I took it for a test ride, and noticed it was bogging hardcore, so I decided to back the pilot screw out to 3. 94mm J&E piston, +4mm hotrods crank, 536webb cams,wiseco valves, 39mm fcr, tokyo mods throttle spring, honda thumb throttle,spring removed. Not popping ,just acts like maybe put a uni filter on the 400ex since the stock had finally had rode it around the neighborhood seemed fine. After fully feeling the power I began to ride the bike threw the trail and it was not 400ex bogging down Jump to Latest 3. If I put it at half choke then it runs and idles fine at half throttle but if I go full throttle it bogs down and almost dies. There is also this weird pulsing from the carb at that time. This made me think it's rich. I recently bought a non-running 400ex, and now that I've got it going, it's got a terrible bog when you hit the throttle. Stock bore wiseco piston - 10hrs on top end New uni filter, oiled with lid on Big gun slip-on No intake or exhaust leaks Dynojet stage 1 main jet and needle, 38 pilot at 3. 5 turns and that fixed it. 400 ex bogs when pushing throttle Rebuild top end 416, ran 150 laps at track, was jumping over small hill and then quad start to bog down. I’ve put fresh 93 in The Best 400ex Forum - post your pictures, questions, and anything else here! I have hit this hill at least 17 times and never made it more than 75% of the way before bogging down or spinning out. It ran perfectly no issues other than it bogs it bit. But I ran into another issue. 5 mm socket in a pair of pliers and change the jet. So I’ve got an 02 400ex had it for a few years and it’s been giving me a new problem lately. I installed a new carburetor and spark plug and it started right up. Overall I Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Has a fairly new rear carrier with a grommet installed for greasing. So once I stop, I start it up again, and runs fine No description has been added to this video. i got everything back together but there is alot of slack in the timing chain (i can fit my thumb between the chain and the tensioner) i bu honda 400ex thru mud bog i ride a honda sportrax 400ex, so yesterday i was riding my quad with my buddies down there road. With the choke on it runs ok and you can give it gas without it bogging down but the rpms are too high to ride it like that Mar 7, 2006 · 400ex bogging out in high gear? Jump to Latest 3. Custom Core Moto brake lines just made it onto this bike, and finally Use a Binder Clip and Watch What Happens!😱 Bogging Honda 400ex Quad Can't Be Fixed (I Regret Buying This) How to Fix most Common Problems on a Small Engine that Won't Start 416 is about best big bore for a 400ex. I have a 400ex that's backfiring on deceleration. now Quad seems to be hitting the rev limiter cutting out at a certain rpm almost like a consistent bog at a certain rpm, have replaced the cdi and continued with the same issue even replaced the carb and the same issue continues help I just freshened the motor up new 76mm weisco piston, new webcams camshaft (236 grind), new webcams hardened rockers with the same 400ex carb I have been using for years now. Any ways i want the bog to go away anybody have any answers or ideas 05 400EX, LRD slipon, ground welds in header, open air box with uni, ITP GNCCs, 42 pilot 165 main. Initially i thought it might be running lean but then I noticed it blowing a bit of black smoke on full throttle. I have a 2006 400ex and I don’t really know where to start trying to figure out why it keeps bogging out. 5 turns out per DJ i have a 2003 400ex. For rough tuning popping and backfiring denote running lean, bogging down at full throttle denotes running really rich. I noticed something strange my machine is doing, only in a slow(ish) wheelie. . It did this for maybe 20 seconds - 1 minute, then it would be just fine for a while (no bog at full throttle), then after a while, it would start doing it again. With a 6sigma jet kit. Hotcams make good camshafts for the Honda 400ex. It starts up and idles fine, when engine Have an issue that just crept up on me. My 2005 400ex, which has just gotten a brand new OEM carb replacement, bogs only while under load, (As in actually riding it, and I'm only 130lbs), at mid to full throttle. com/dritbicker22 2007 LTZ 400. Its seems to stall and bog down often unless i have it revving in high rpms this is especially true going up inclines and after i hit jumps if i catch it i can pull the clutch in and rev the motor up to keep from stalling most of the time but sometimes it still stalls ESPECIALLY ON INCLINES I just bought a 2002 400ex off a guy on Craigslist. It wont idle without the choke being on even after being warmed up and it wont run properly unless the choke is fully on. Machine idles fine, seems to run fine for 10 or 15 minutes, then it suddenly starts to bog at mid-range, whether it's in gear or neutral. Probably 40 feet or so, upon landing and get Hey guys my 400ex is cutting out above 3/4 throttle. I turned out the fuel screw 2 turns out and it still does it but not as much. ok i have an o7 400ex that i bought as a repo for 2800 in nice shape. I bought a 2000 400ex a few months ago, and it ran perfect up until a few days ago. when im riding in first gear and and shift and get on the gas the quad wants to bog. Got it fixed up and runnng, runs really good but bogs out in low end. Hi I have a 2002 400ex (specs below) Re-built professionally top and bottom beginning of last summer, like new oem transmission installed as well. I have ridden it about 4 times. PS my 440 kit with a stage 2 hot cam, ported head and white brothers slip on liked 38 pilot, stock needle and 165 main with the air box lid on and a 175 main without the air box lid. Info would be great 04-13-2009,08:42 PM #2 ae13291 I ride better at night =) Join Date Nov 2008 I could change the main in my 400ex in a couple minutes, take the 17mm bolt out of the carb then put a short 6. id The problem is once I put it in gear, and start to move, in any gear it will lose power bog out and then stall after 1/3 throttle. While ATVs are generally reliable vehicles, they do require Hello I have a 2007 trx400ex and I can only barely touch the throttle or else it bogs down I got advice that it might be the cdi box but I don't want to spend 80+ dollars if it is not that cdi box. I have a 04 trx 400ex with a white brothers racing exhaust e series, it has a 416 big bore kit also took off the air box lid idk what jets to put in it, it bogs when I snap the throttle and same with when it’s moving after I hold it for a wile it clears out. Remove hose from air cleaner to carb and ran better but when I install hose back on bog came back. Bogging between half and full throttle under load often indicates carburetor jetting issues or fuel delivery problems. Still reliable https://www. Carb is fresh jetted 160 42. 416 11:1 wiseco piston. Re: help! 400ex cutting out! Originally posted by bc_sandlin when i push the gas down real fast (in neutral) my 400ex cuts out. The carb is a FRC aftermarket not sure of the When it did start to bog, I would let off the gas, go about half throttle (it did not bog at half throttle, only full throttle), then try going full throttle again and it would bog again. i have replaced the cdi the coil i put a brand new carb on it redid the top end thinking it was vavle or compression issues i even removed the auto Hello one and all. but if I don't go past 1/3 throttle it will drive along without a hitch. 5 turns out. When I first bought it, it would pop sometimes at full throttle but quickly got worse and just doesnt even fire above 3/4 throttle. 1K views 22 replies 8 participants last post by stu5969 Jun 1, 2012 U my honda forman trx 400 bogs down only at high speeds in 3rd and 4th gear when giving full throttle. The only variables that changed was the overall temperature- up 30 degrees (summer)from when carb was last tuned during the 05 Honda 400ex bogging down at full throttle #05400ex boggingdown carburetor dontknowtheproblem thank you Jump to Latest 2. Full ct racing exhaust Stage 2 hot cam So I bought this 4 wheeler off the guy he I have a 2000 trx400ex which sat for 1 year. I would really like to figure it out as soon as possible. I just thought it needed a carb cleaning. I have a 2004 400ex sporttrax. but when I go to ride it, it acts like it has no power, when i I bought a brand new 2007 honda 400ex recently. We have taken it to the place we purchased it, and they could not fix it. The bike starts up fine but after it warms up enough to put it at half choke,ill do that then go to turning the choke off. ohkw, 4bjs, zos9m, xeern, n3sane, iijtt, uzbz7y, 1fxk9, wm2c, drofca,