Honda 400EX ATV Carb Rebuild & Cleaning | Partzilla.com

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Buy individual Honda TRX400 carburetor parts for your rebuild: bit.ly/TRX-carb-rebuild-parts
Buy a TRX400 carburetor rebuild kit: www.partzilla.com/product/aft...
Is your ATV hard to start or does it idle rough? This is the place. In this video from Partzilla.com, John will show you how to disassemble, inspect, and rebuild the carburetor on a Honda TRX400 EX. Above you’ll see two links. One offers a list of the individual parts you may need to address specific issues with your carburetor, and you’ll also see a link to a carburetor rebuild kit, which has many of the parts you’ll need.
Get a closer look with our Honda ATV parts diagrams. You can see all of the parts for your carburetor here: www.partzilla.com/catalog/hon...
Read how to do this job step by step: www.partzilla.com/blog/honda/...
Starting issues aren’t confined to the fuel system. Diagnose starting issues with your electrical system here: • Help! My ATV Won’t Sta...
Change the oil and clean the air filter while you’re taking care of maintenance: • How To: Honda ATV Oil ...
VIDEO HIGHLIGHTS
Carb disassembly - 4:06
Hose inspection - 4:44
Pre-filter inspection - 5:14
Pump diaphragm inspection - 5:36
Float bowl and float needle inspection - 6:08
Air/fuel adjustment needle inspection - 7:38
Main needle and idle jet inspection - 8:48
Cleaning the carb body - 10:34
Cleaning carburetor passages - 11:29
Carburetor rebuild - 13:16
Carburetor installation - 19:01
Find thousands of Honda ATV parts: www.partzilla.com/catalog/hon...
Talk to us:
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In the video we’re working with a 2007 Honda TRX400 EX, but you may have similar steps for your Honda ATV. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.
RELATED CONTENT:
Diagnosing charging issues with your TRX400:
• How to Test ATV Stator...
Replace the drive chain on your Honda TRX400:
• ATV Chain Replacement ...

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1 мар 2016

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Комментарии : 347

@danielguerrah.3864 Год назад

I don't even speak much English and just watching carefully do it helped me save more than 500 dollars. My family and I can't thank you guys enough! Muchas gracias!

@huff-man1953 8 лет назад

your videos are the reason my quad runs accordingly lol.

@aaronmgray 6 лет назад

I followed this video for partially rebuilding my 2006 TRX400EX carburator with the AllBalls rebuild kit. I honestly know next to nothing about carburetors, but this video helped. The video you have on the valve adjustment was key too. Quad runs perfectly now.

@asgersotoxic2108 4 месяца назад

I hated that rebuild kit couple parts arent the right size compared to the oem the main was too small

@juanmonroy3773 5 лет назад

Great video, got my quad running thanks to a few of his videos.

@rubenflores2011 6 лет назад

Watching your videos gives me the confidence to do it my self. I'm already a hvac mechanic but this is a different beast .

@kells1786 4 года назад

ruben flores just got into the HVAC trade. I am currently a new home installer

@HB-CREEKER443 Год назад

Thank God for Partzilla. WHAT WOULD MOST DO WITHOUT THESE PEOPLE. So glad I just found their RU-vid.

@thetoolguy4721 6 лет назад

Thanks for the videos you post , it really helps keep up the good work !

@jamesdavid5997 3 года назад

So many Thanks to you for these videos, I'm never to worried while buying n trading my atvs! Awesome Awesome explanations tips n great views n perfect part info just hit pause! Ty Ty

@JeffAffeld 6 лет назад

Great video, this really helped me in cleaning my carb up and also finding my problem. My carb was missing the screw to the slider arm. It still ran but would not rev out and I couldn't figure out why. It has a ton more power now. Thanks for the great video.

@shtevedip1175 4 года назад

This video worked on my 2000 Honda 400ex. Thanks!!

@easttxtycoon 8 лет назад

Thanks for making the vid, very helpfull, and most detailed that I have seen so far. Got my carb off and about to start breaking it down.

@PartzillaParts 8 лет назад

+easttxtycoon: Awesome! Thanks for watching Easttxt. Shoot us a comment if you have any issues breaking down the carb and we'll do our best to help. We also have an OEM diagram page detailing how everything goes together on the 400EX carb: www.partzilla.com/parts/search/Honda/ATV/2007/TRX400EX+A/CARBURETOR/parts.html

@Ram-vt3rm Год назад

I have never done anything like this before and your video made me 100% successful! Thank you.

@PartzillaParts Год назад

Great to hear!

@garthmorris8612 8 лет назад

Thanks your video helped me get my 2007 trx400ex going...

@PartzillaParts 8 лет назад

+Garth Morris: Glad to hear it, Garth! Happy to help.

@slick1844 6 лет назад

You are a great mechanic I would rather watch these then tv luckily I don’t have any of these problems

@talbi89 6 лет назад

Thank you and keep up the good work

@carlovincetti1352 5 лет назад

A way to make an adjustment tool for the air-fuel needle on the bottom if the carb is on the bike or off. Take a piece of hot glue melting it on the end jamb it up there letting it cool then trim off the excess on the sides. Cut the hot glue to the length you need to get it in there. Put a mark right in front of you on the glue stick. Good to go:) 1/4 nylon tubing will work as well just get the tip of it rounded when hot before you push it up there.

@639Beaver 7 лет назад

Great video, you fill me full of confidence to perform repairs.

@PartzillaParts 7 лет назад

That's what we love to hear. Thanks for watching, Walter!

@rubenflores2011 6 лет назад

Thank you I really appreciate that I have a 2002 model

@valvefloatproductions9083 7 лет назад

These are the best videos to ever be made

@PartzillaParts 7 лет назад

Thanks! We think there should be some RU-vid Oscars or something.

@grillomix 8 лет назад

Really good video, very helpful, thanks

@PartzillaParts 8 лет назад

+grillomix You are welcome. Will keep making more! Thanks for watching.

@aol11 11 месяцев назад

Thank you!

@tilburybassmasters9613 6 лет назад

Thank you

@spot1468 6 лет назад

Thank You.

@isnipejustin 5 лет назад

Great video!

@slickatv5251 2 года назад

Great video...might need to rebuild mine soon...the 400ex doesn't idle very well...

@wolfcale49 8 лет назад

love the videos

@karlprovost1038 5 лет назад

thank you sir, it works perfectly for me on a TRX400EX 2012. It's an amazing tutorial!

@PartzillaParts 5 лет назад

Thank YOU for watching!

@redneckwalling2057 5 лет назад

You should make a video on a 300ex. How to rebuild the bottom end.

@11GalleryATV 3 года назад

Why don't you have the "anti-cavitation device" in the float bowl? (the plastic piece around the main jet that helps keep the fuel from foaming at high rpm which will cause the carb to be lean)

@jpie028 7 лет назад

love your vids thank you for this

@PartzillaParts 7 лет назад

Thanks, Joe! Glad you like what we're putting out. See you around the tube!

@cameronnalley3197 7 лет назад

Partzilla so I was putting the hoses back on. Should there be 2 hoses dangling?

@PartzillaParts 7 лет назад

Hello CamRides. You should only have one dangling. Its the one attached to the float bowl.

@leehuntley189 3 года назад

Next video take out two bottom subframe bolts and push up! Giving you clear view of all of it!

@surfstarcc1 5 лет назад

Thanks

@OffGridretreat 5 лет назад

Atv sounds as if it’s sucking air can that be possible a leak on the small hoses on the carb , it runs during the choke and without this video I was going to spend big money so thanks for the help , just one part of the float bowl wasn’t shown which was the plastic thing on the jet that’s very removable...

@raven7068 4 года назад

Good breakdown. But I want to hear it run, at least Idol for 10 second But I saved the video in case I have to work on mine someday.

@robbelmore418 8 лет назад

Great video! Started tearing down my carb for cleaning and rebuild, realized the throttle stop cable was broken off the thumb screw. I ordered a replacement from you guys, is there a video from Partzilla that explains how to remove and replace the throttle stop assembly on a 400EX?

@PartzillaParts 8 лет назад

+Rob B Not yet. We had moved on from the 400EX but are going back to it to cover a couple more topics. I'll throw this one back into the list.

@IceStone69 4 года назад

I think its hilarious at the end, it barely turns over, and he says There u go lol a no sir let it idle and we'll see

@JBurris 2 года назад

I felt cheated there at the end too. All that for some bs little bump.

@lrm17romo93 8 лет назад

Thanx it helped me alot

@PartzillaParts 8 лет назад

You're welcome, Jose!

@dterr41958 3 года назад

Hello I have Keikhin carburetor modeled KTB and it has two black adjustment handles can you please tell me what those are for and how they work together briefly you’re awesome thank you.

@riv1950 7 лет назад

Very good videos you make, thanks a lot.Does it take many hours to rebuild a carburetor like this?One working day?

@edlvsgng 5 лет назад

One day

@tylerlucas6312 4 года назад

Right by my choke, there is a spout that is spitting gas out when get on the throttle while I’m driving. There should be a line there but I don’t know where it goes

@davidv.5360 6 лет назад

Thanks for the great videos! It helped me with the carb rebuild. I have a question: I rebuilt the carb on a Honda trx 400ex 2006. When I started the atv, it was started and ran for a a minute or so. It started a couple times right there and then. However, after those few starts, now it doesn't start. The engine turns over but that's it. It's got a new battery as well just so you know. Could it be the carburator? Any ideas will be much appreciated. Thank you.

@PartzillaParts 6 лет назад

Hard to say...could be a pinched line, incorrectly connected or the air/fuel screw, needle valve...you could have missed some debris when putting it back together and clogged up the works. Best to just go back through it and see what you find.

@billsheets8308 3 месяца назад

What cleaning solution do you use in your ultra sonic cleaner to clean carbs?

@talbi89 6 лет назад

Great video just wondering if this would be the same curb cleaning process for a 2004 Honda TRX 450r sportrax quad? Regards

@PartzillaParts 6 лет назад

Process is the same, but the carb is slightly different, if I remember correctly.

@Spencer1609751 7 лет назад

great video thank you. How can I get one of those D driver for the air/fuel mixture screw?

@PartzillaParts 7 лет назад

www.partzilla.com/parts/detail/aftermarket/XP-4815775.html That should be the one!

@MorrisOutdoors98 4 года назад

The hoses that connect to that plastic "Y" port, what is the purpose of that line?

@shawnyeager6491 2 года назад

I found the little black shock absorber looking gasket (.25" long about 1/8" diameter)/ bushing it's pictured in some of the rebuild kits, but you don't mention it, where does it go?

@maxwellquinlivan4386 3 года назад

Partzilla I’m lookin for a video for an 05 yfz450 carburetor rebuild. Thanks

@mattanello414 3 года назад

do you need the baffle plate? I took my carb apart apart and it didn't have the d hexed shaped bolt for the air screw it was a flat head screw with a gasket

@willcountypowersports6338 2 года назад

Hello what solution do you use inside of the ultrasonic cleaner thank you?

@jayjay-il7fk 2 года назад

What jets do you recommend for an open air box and a K&N air filter with a slip on white bros pipe?

@RevoReese 7 лет назад

When I took mine apart there was another plastic holding the float. I put mine back together now it leaks all crazy. The rebuild kit I got has a seal that seems stretched, doesn't fit in the float bowl groove, is that normal? Carb leaks all crazy now.

@toxicgaming8036 3 года назад

do u guys sell the air fuel flow d shaped key

@TheBreedxxx 3 года назад

What do you use in you’re ultrasonic cleaner ?

@codywedig334 3 года назад

do you have the hoses for sale as a package. I see I can buy all the individual pieces like clamps and hoses, but just wondering if I can buy all the hoses in one package. I do not need the fuel hose that goes to the petcock or the hose that goes from inside the throttle cover. just the two ports on the side of the carb and the other one by the bottom of the carb that is like an overflow or something

@trevorbennett4324 3 года назад

Hey there, I cleaned out the ladies 400ex and while twisting down the throttle cable bolt to the carb i knowticed the mental tubing doesnt sit straight or to the right... it sits facing left when skrewed all the way down which interferes with the placement of the gas tank. Any ideas on what to do? Probably a no brainer but im having issues lol

@waserak47 5 лет назад

Got a keihin carb can I take the jets out my old carb and use them in the new on I have moose racing cdi box airbox delete with k&n filter dmc alien slip on will I have to do additional tuning

@bryan_trades8867 8 месяцев назад

Will rebuilding my carburetor stop my overflow tube from leaking when i have my quad turned on during idle?

@manuelbonilla3646 2 года назад

I just bought a 07 400ex and oil change and spark plug i can take the carb out no big deal but put it in back in place man those really tiny things

@calebmclean17 2 года назад

for the main jet the part that has the nut on it am i supposed to tighten it all the way down then tighten the nut

@TheStriper14 6 лет назад

great video my carburetor leaks gas constantly from a small tube on the bottom facing to the rear what can that be even when its running

@PartzillaParts 6 лет назад

Most likely a stuck float or worst case a rebuild.

@Banj0Bansh33 4 года назад

Im looking to buy the seat for the float needle that you've got in the video. The problem is it doesn't show up on any parts diagrams. If anyone knows where i could find one it would be very appreciated.

@lrm17romo93 8 лет назад

you should do one on how to adjust the clutch springs to make it harder

@DomTrav1s 2 года назад

Get heavy duty clutches

@wolfcale49 8 лет назад

will you be doing anything aftermarket wise??? i think more 400ex's have aftermarket parts bore kits, ported polished head, shocks .. that kinda thing iv built a lot of 400ex but i love watching other ppl do it to them to see there techniques ..

@PartzillaParts 8 лет назад

+Adam Wolfcale Adventures We were not planning on it but the basic procedure for pulling it down and reassembling is pretty much the same and we have a 3-part video that shows a top-end rebuild. When you start getting into the really high performance stuff like pop up pistons you just need to be really careful with the piston to valve clearances. Modeling clay will tee just how close things are getting. Honestly, most of the kits out there have done their homework so you should be safe.

@jayjohnson488 4 года назад

the nipple on the right side of the carb,facing the back end is that a overflow hose? I have fuel leaking from there so im assuming i need to clean the car but need t know f im supposed to have a hose there & if so where does it route?

@bradleysharp8523 7 лет назад

I have the same bike you worked on I cleaned the carb completely used air and carb cleaner to blow out all passages all jets are clean and free of any debris drained all fuel from tank replaced with fresh fuel fires up fine with throttle revs fine but won't idle... Any suggestions?? Thanks

@zhivix8263 4 года назад

Nice... part of my pump diaphragm pieces went flying.

@emanolmontoya1260 8 лет назад

if my quad dosn't rev all the way and bogs when i throttle it all the way down does that mea that i have to clean the carburetor

@SuperJamesrice 7 лет назад

do you have a video showing how to replace a choke cable on a 2006 trx Honda rancher 400fa ?

@PartzillaParts 7 лет назад

We haven't done any Rancher videos yet, but choke cable is a good idea. We'll add it to the list of repair video ideas. Thanks for the feedback, James!

@tomsheets6399 6 лет назад

Hello, on my trx400ex - yesterday I took my carb out for easy access to my starter which I rebuilt. After putting the carb back in along with the airbox - i turned the gas on, I immediately noticed that I am getting fuel in my airbox. This was not an issue prior to my taking the carb out. Can you tell me what the likely cause of this is? Thanks...you make great videos and raise my confidence level when working on my 2000 trx400ex

@PartzillaParts 6 лет назад

First things first, check your hose routing. You may have crossed something up

@BeardedBart 6 лет назад

What does the vacuum hose hook up to?

@jjay718 4 года назад

Do you have a rebuild kit for a 2012 TRX400X? I cant find these part numbers when I look them up now.

@willybman3723 4 года назад

Please do a build series on 2004 trx450r

@johnwalker7227 3 года назад

Is this the same carburetor for the 300ex? I'm having trouble finding the rebuild kit for it.

@user-vk2mp8ez5o 7 лет назад

Rebuilt the carburetor on my wife's 2005 TRX400EX yesterday because it was leaking through the overflow tube. Cleaned and replaced everything that came in the kit and the float needle, temporarily placed the carburetor back on the ATV and did a flow test, it failed, still leaking through the overflow tube. Any thoughts?

@tomsheets6399 6 лет назад

Hello, I have a 2000 400ex. I rebuilt my carb tonight following your direction in this video. Thanks for the info. Question, when I got to the part where you use the d-shaped tool to remove the air/fuel mixture (at the 8 minute mark). On my carb it was not d-shaped and the head of it was practically flush with the top of what was screwed into. In other words, there was no where for me to turn it in (2.5 turns in your example) before backing it out. As a result, i don’t know how to set my air/fuel mixture precisely. Please sdvise. Thanks for your help.

@PartzillaParts 6 лет назад

The D Shape came in later years. Typically, you can put it at 2.5 to 3 turns out to start and adjust later if necessary.

@Hyngyynj Год назад

What solvent do you use in the ultrasonic cleaner

@ernestoadadbudeguer2844 3 года назад

excellent a genius

@derickashby8294 8 лет назад

I am trying to figure out why my 4 wheel drive won't work on my Honda Trx 500, any suggestions?

@nemesis83100 5 лет назад

I have a 2018 trx250x it started bogging i cleaned the carb(blew out the jets and all the holes) and it still boggs..any ideas?

@hankhamadi3410 5 лет назад

What does the air cut off valve do?

@scottstene53 3 года назад

Where can a person purchase that D style adjuster tool if you don’t mind me asking ?

@StuntTube 7 лет назад

i didnt do a as though rough cleaning as this just the jets and bowl. I put it back together now it will not start at all just turning over once in a while get a small putt. There is spark and fuel going in what could it be??

@johnnymoran180 5 лет назад

I was blowing air through the pilot jet hole and a little rubber plug popped out. Can you tell me where it goes?

@tomsheets6399 4 года назад

those clips that hold the air box to the frame, were they used on earlier 400ex 's as well? I have a 2000 and I am not seeing on my air box the same clips

@PartzillaParts 4 года назад

Might be slightly different on a 2000.

@ianhutchins3620 3 года назад

Where the D tool goes for the air fuel ratio, i dont have a D shape, its indented in a bowl shape what should i do?

@FoXyGrAnDdAdDy 7 лет назад

my 300ex jetted and stage 2 hot cam wants to idle fine at first for a few minutes then it starts idling way to high any ideas?

@jayjay-il7fk 2 года назад

OK at 15:26 when you put on the float bowl. My 400ex has a little plastic basket that goes on top of the main jet.. What is the purpose of this? Why does that carb not have one?

@jameshopkin7585 4 месяца назад

So what happens if you don't have a screen filter for the incoming fuel?

@carlovincetti1352 5 лет назад

At 13:50 you say the "spring follows" by the washer and o-ring. At 8:11 you take the needle out saying "there is your 0-ring and there is your spring" falling out last and you never mention the washer with that assembly. This just so happens to be the only reason I came to this site to find out the order as the sob fell out when I wasnt looking. You put it back together wrong it looks like because the washer would have to prevent the spring from damaging the o-ring after the spring sealing it all in the carb. Unless the washer and o-ring jumped over the spring while you carefully pulled that needle out. Then again you had the needle out halfway when you said that and it looked like the o-ring was on the needle. ty

@philipplett3884 Год назад

I have a 2007 honda trx 400ex just gave the carb a good cleaning but cant figure out where the vacuum hose connects to. part number (95005-45001-50M ) It has a plastic Y piece close to the carb but got no clue where it goes on the other end. My stock petcock is not vacuum operated so where does it lead on the other end? It wasnt capped off. Cant remember taking it off when disassembling cant remember where it connected too...

@halleffect1 2 года назад

what causes bogging? I've cleaned the carb a few times now, it idles fine bogs down on throttle snap.

@videoceeper 5 лет назад

what is the main jet measurement? the height of it ?

@michaellarcom 2 года назад

Why didn't you check the holes on the sides of the Jets? Just because it sprays through the bottom of the jet doesn't mean it's getting vacuums through the side holes. Where do you get the mixture screw socket

@drago2353 8 лет назад

I just noticed gas is leaking during idle out of the drain port hose, i secured the bleed screw. It seems as if to much gas is in my float bowl, would this have to do with my needle jet or float valve any suggestions?

@drago2353 8 лет назад

+Drago23 After removing float bowl I did find float valve dirty, cleaned and reassembled it, no more leaks!

@jv06gt67 7 лет назад

How i adjust the idle on the carb?

@jasonsimpson9206 3 года назад

2002 Honda 400EX. Backfires through carb will not idle stalls out. Runs fine up top pretty strong. Set for a while the person told me I purchased it from. Did a carb rebuild kit and still same issue. Help please!

@lombardozarateiii6920 6 лет назад

I know it's just a 250 compared to one of these 400 but can u please make a video on how to remove the stator of a trx 250ex? I cant seem to find a video on how to remove the stator.

@PartzillaParts 6 лет назад

The stator is on the front of the engine on that one, if I remember correctly, it's a little weird. I'll try to get a unit to do a video on.

@rubenflores2011 6 лет назад

You arerallyclear in what you do. Can you do one about a Yamaha raptor 660 2002

@PartzillaParts 6 лет назад

Added to the list!