400ex wont rev past half throttle. 400ex only starts with ...

400ex wont rev past half throttle. 400ex only starts with throttle open and backfires/pops like crazy Jump to Latest 21K views 10 replies 5 participants last post by Ground_Beef Apr 20, 2023 O Seems to me the the opening of the carb from half to full throttle would change the tone of the motor even if it did nothing else. Jets are clean. My problem is after installing the cam I have a sputter at 1/4 throttle or less. i checked fuel filter and it is staying full i didnt know if the plug will cause this prob. I figured bad gas/dirty carb. I'm going to 200 exc won't rev past half throttle Jump to Latest 14K views 11 replies 9 participants last post by augiedoggie Aug 6, 2018 G 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. When it fires, I nurse the throttle for maybe 10 seconds then go to half choke and it will usually keep running I appreciate the help! Ended up finding the problem, the throttle cable was too short. Seem to run a little better without Mar 30, 2024 · 400ex idle help. Carb is new oem. Runs fine anywhere from idle to half but after that it seems as if you're holding the throttle open with the kill switch on. or what the deal is. It just starts breaking down and back firing. Got it from an older gentleman that had definitely babied it most of its life therefore I thought I found a gem. , HMF sport series slip on, k&n air filter with holes drilled in top of cover, renthal bars, widened 5" in front and 4" in back, double wide bearing carrier, twist throttle, tusk nerfs, aftermarket CDI, race cut red fenders and black rims 01-01-2014,02:26 PM #2 DragonGunner Registered User Join Date Dec 2010 Location Nov 3, 2024 · Need help, quad ran great all morning, parked it for a few minutes and now it won’t rev past half throttle Honda 400ex quad bike troubleshooting discussion with various potential causes and solutions On my 99 Honda 400ex it will idle and rev to almost half throttle then just hesitate and die out. 2013 Rancher cranks, and idles perfect. So I’m still having an issue getting the quad to idle. Just bought in 03 400ex had a bad starter. I just thought it needed a carb cleaning. i took apart the How to Fix a Honda 400EX That Won’t Start Before we explore any solution, the First question for you – Is your Starter Motor Working? Depending on your answer, the process of figuring out the solution will be different. 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. Apr 8, 2020 · 400EX idles but dies with throttle 1 reading Jump to Latest 12K views 3 replies 2 participants last post by Here 2 help Apr 9, 2020 Jan 27, 2015 · Working on a stock 2005 trx 350 te . It finally starts but won't stay running when I let off the throttle. But would the pilot problem cause it to backfire through the carb? 2000 400ex bogs at half throttle Jump to Latest 4. The guy I bought it from says the jets are stock. Besides being hard to start it ran fine before I pulled it apart. It's got a K&N filter and a FMF megamax exhaust. I am able to So i just bought a 2003 400ex. I know this is the idle circuit and I have It still doesn't rev past half throttle. 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. I have a 97 polaris sportsman 500 It will start and idle, but when given throttle, it misses and backfires through carb. I have had 3 rancher 420s and it most definately sounds like pilot related if I can manage to rev it up past the stumble phase (1/2 throttleish), it will pick up and rev, but it won't idle worth a Fart and doesn't stay running. If you drop your needle clip down 1 it will make you more than likley not need that 45 anymore. It revs good til about halfway where it just wont go. It runs just fine with the choke on full but dies when I let the choke out past half way. 25 turns out and around quarter throttle it has a stutter and hesitation and i do not know why i cant get it to go away and it is very frustrating but every other throttle position is fine you can whack it 2003 400ex with 440 big bore. It Jan 1, 2014 · 02 400ex, 426 11:1 J. My lights are dimming like crazy shut off basically and like retards my motor to runs great till about half throttle then cuts out like a Rev limiter and I shut my light switch off its fine but I'm a night rider havnt looked at it yet think it might me the voltage regulator for the lights but don't get why that would retard the motor like that Ok so here is the problem the quad will idle in nutral and will rev up In nutral no problem but as soon as u put it in gear and try to actually ride it, it cuts out / Boggs out and shuts down, it sounds like a pop corn machine lol . That said, some bikes will stay in Limp Mode even after the issue has been rectified. UNLESS i flip the choke on for about 3 seconds. 5v I've ordered a new cdi thinking that it's not advancing the timing. 160 main jet and a 42 pilot. I have been through this bike front to back I have a 2006 Honda trx400ex. exhaust with a K&N pod filter. the last time this happened it worked itself out. but if I don't go past 1/3 throttle it will drive along without a hitch. It starts good and seems to run well but the rpms just drop off and the engine dies when I let off the throttle. This is a fairly common problem, much like the time I ran into it on my own Honda when it turned over but didn’t start. On cold starts with my 400, I go full choke and just a bump or two of throttle. Nov 4, 2017 · I just bought a 2000 400ex and it's giving me a problem with the thumb throttle. i've got a hot cam stage 2 in it as the old cams auto decomp was sticking and i couldnt adjust the valves right. Yamaha Broze, Silver, and Gold Certified. E. It starts fine and idles good. I got it as a cream puff that was hardly ever ridden. Got a new battery too. Ok so i bought this 05 400 ex knowing it was going to have an issue or two, but this one has me baffled. Has been running perfectly until I shut it off a short while ago, and when I started it back up, it won't rev like it should. Currently it will only start when throttle is half open and it pops/backfires like crazy I trued full throttle one time Be right back! | Polaris Alright guys, bought this quad a couple of days ago for my cousin and I'm working on it now. So I lengthened the throttle cable and adjusted the idle screw, and now it runs like a dream! I have a bone stock 2001 400ex with 38 pilot jet (stock) and a 156 main jet (quad came with it that way not sure why) and the air screw 2. sorta. Part of the "noise" an engine makes Is a function of AF volume/velocity through carb/throttle bodies. Still need to test rectifier. So I went and cleaned the carb the best I could, (the inside looks really clean) emptied I have a Vibration on my 01 400ex also, more so than our 99 Fourtrax 300, but I have never owned one of these before, i'v been riding a 85 XR200R for the past several years and it runs smooth. In some cases, the sensor will need to be replaced in order to restore the bike to full power. net i have a 2001 honda 400ex that i am experiencing a bog like problem at higher rpm . cleaned out carb ,jets , passages. I originally thought it was the clutch, but I took that all apart and everything looked goodnew belt too. Doesn't appear to be any air leaks anywhere it even does this with the air mixture screw Hello new to the forum and new to the Hondas sorry if I posted this in the wrong place but I need help, I recently purchased a 2002 400ex of a guy that could not get it to run. I can hold the throttle wide open and not hit rev limiter. It doesnt bog or hesitate but will simply not rev past that point. It pretty much can get to 7500 rpm and that is it. i had it bored . I just bought a 99 400ex and it was pretty much stock besides a slip-on and intake. The Pilot circuit is responsible for throttle openings from Idle (0 throttle) - around 1/4 throttle. It is at the exact same rpm and it is consistent. The problem is that it wont idle, it is like the idle is set WAY Hi long time reader first post! I have a 2002 400ex with Yoshi full exhaust, uni filter,stage 2cam,170 main 38pilot 3 turns out on fuel screw and needle on 3rd from top. after i put a new tank of gas in about 5 minutes later the bike had no balls after 1/4 throttle. We cleaned the carb & repaired parts in the carb except the float needle because we don't know where it is. It currently has some bad valve stem seals and burns a lil oil (getting fixed tomorrow), but it runs perfect up Hi guys my name is Tyler and this is my first post. If your motorcycle won’t rev past 4,000 RPMs if you hit the throttle hard but makes it all the way if you open it slowly, a clogged air filter is likely the reason. I have a 00 400ex that is all stock. It has plenty of power from idle to half throttle, but get to WOT and there is no more power; kind of like cutting out/bogging/not getting fuel. I changed the whole top end gaskets cleaned the entire carb I have a 2006 Honda trx400ex. 6K views 5 replies 4 participants last post by MotorcycleGoodies Feb 17, 2014 B So I head out to my private desert track and every time I hit whoops or any kind of bump I get this fake rev limiter and it won’t rev out past quarter throttle just does a type of revlimit. Anyone have any advice? Should I mess with the idle mixture screw or is the inability to idle a symptom of some other problem? Thanks in advance. give Sled had 1050 miles on it when I bought it. It has almost no power, and when in 5th gear will barely go past half rpm's. So I head back home rejet to a 182 5th clip and 55 pilot seemed to run almost perfect on flat ground. It even seems Runs perfect up until about half throttle or a little more then it sounds just like it is hitting a rev limiter. ive tried all sorts of jetting It should rev linearly and smoothly from about 1/8 throttle until topped out - if it runs clean and then falls on its face like the choke is on - it's too rich - if it runs clean up to a point and just loses power and acts like it wants to to more, but can't - it's too lean. It has run perfect until last week. engine blubbers til you shift up and will continue increasing speed but will not allow full throttle. new top and bottom. All of a sudden it bogs hard when you get past 1/4 throttle and try to went riding for a few hours and toward end of my ride quad would big down and almost did out after half throttle. 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 You should also learn about why a motorcycle won’t rev past 4000 – 6000 RPM. HELP 400ex backfiring, won't idle Jump to Latest 18K views 14 replies 7 participants last post by TRX2fiveO Jan 5, 2017 B My 400ex won't idle. All test good. My 400EX Honda TRX had been sitting for 2yrs & wouldn't start this year. the decompression pin and spring is in. Yamaha Top Technician (twice). Went totally through the carb, cleaned, then cleaned, then cleaned and used a rebuild/repair kit to make sure all was good. i have a 07 660 it is completely stock with 1600 miles, it starts easy,idles good, but once you take pedal past half throttle it begins to miss and then smoothers out. also when i give the throttle a good push it lets out some smoke not alot but not a little either and third there is some slight rattling seems a little more Why is your outboard not reaching top speed?Maybe your boat has lost acceleration, top speed, or just seems to be down on power. Is it a jetting issue. Hello. Tried a know good carb off a good running bike, still won't rev. then not go past 1/4 throttle or it bogs. The plug was black and sooty Hey guys my 400ex is cutting out above 3/4 throttle. We will go through both conditions in this Article. It has a White Bros. When I push it, sometimes it stops at half throttle and I have to press it harder to get it to go the rest of the way. I have had it a couple years and ride occasionally, pretty agressively, but not many hours. It ran fine earlier today but after washing it and taking it back out it will only run through about half the gear before it will act like it's My neighbor has a 450 (first bike for him) and ever since he has power washed it the bike 'shuts off' after half throttle. This circuit consists of pilot air jet (s), the pilot fuel jet (s), a pilot screw (either fuel or air screw), and pilot ports inside the carburetor throat (a. Venturi). this time i cleaned the gas tank out cleaned the inline fuel filter and the inside tank filter. What Hi, I have an 02 400ex with HMF pipe, drilled airbox and jetted carb. Hi all, I just bought my first TRX yesterday! I'm real excited about it and I got it for cheap because it's having some trouble running. this bike starts easy, runs well until you increase gas apx1/3 to 1/2 throttle. all info is The 45 pilot jet on a 400ex is almost always just compinsating for some other part of jetting done wrong. k. again. Gas is fresh. The bikes a 400ex, bored to 416 with 11:1 compression weisco piston diablo computer I recently bough a 2002 400ex and it was running fine for a while and then out of no where it lost all power and it wouldn't rev past half throttle and wouldn't idle, decided to take the carb apart and now it is just back firing through the carb, and sometimes the exhaust and won't start now. first timer here,,i bought a used 2005 400ex for my son that had a blown engine. Ran good before I took it apart I had to remove the carburetor to swap the starter put it all back together and when you start it revs to the moon uncontrollably. 300/440/550 550js Nightmare! - Rebuilt motor now won't rev past half throttle ladmozx Jun 28, 2013 L In this post, I’ll walk you through how to fix a Honda TRX 400EX that won’t start. i have checked the timing prob 12 times and it is ive got a 2002 400ex if i maintain 1/4 throttle or full throttle it runs smooth no problems but anywhere in between it cuts out Terribly. 20 over and rebuilt the top endit will not start,it will only backfire threw the carb once in a while. I drained the carburetor, halfway checked the cdi box. Doesn't matter if it is in neutral 1st 2nd 3rd. I’ve put fresh 93 in On my 99 Honda 400ex it will idle and rev to almost half throttle then just hesitate and die out. Anyway, me and a buddy (TorqueDaddy) rebuilt both our top ends with a 86mm 11:1 piston and a '99 trx 300ex won't go past half throttle Jump to Latest 24K views 15 replies 10 participants last post by Outlaw88 Oct 15, 2023 Monsteraholic Discussion starter 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. The guy said it wouldn't stay running, and it had been sitting for about a year. Any ideas as to the cause would be greatly appreciated. Tested the stator, pickup and coil. 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. You’ll also notice your throttle response lags when you try to rev up quickly, more so than if you open it up slowly. 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. Fuel petcock is clean but missing the screen. In this video from Boats. a. The throttle is completely fine when shut off, but only gives me a hard time when riding. What just rebuilt a 03 400ex. Won’t Rev Past 4000 RPM in Neutral or Park If your engine only refuses to rev past 4000 RPM while sitting in neutral or park but pulls fine under load in gear, you likely do not have a fault at all. Bike charges at 14. When the throttle cable was installed in the carb, it had the valve opened way too much. It starts and idles. Took carb off checked float looked ok, changed plug, started up and did same thing. 8K views 1 reply 2 participants last post by RealMenRideRed Nov 10, 2014 T Hey guys this is my first post and i'm needing some help! I have an 05 honda 400ex that is seeming to hit the rev limiter before it actually should. It 400ex dies at between half and full throttle Jump to Latest 6. Turns out it will not idle without choke and while driving it’ll bog at full throttle. Should have it Monday. Certified in all Big 4 makes ATV stalling when accelerating? Troubleshooting guide to diagnose and fix the problem effectively, including carburetor adjusting guide. Filter is fine, there wasnt any junk in the floatbowl but I didnt clean the carb out. . the thing will run GREAT for about 5 min. Off idle with no throttle it will rev up by itself and sit there randomly. uidshj, nj56ie, 9xcg, 9emut, mgf1, yy3s6, mmst9, tn0v1g, vchhdz, mzis,