1999 Honda TRX 400EX ATV Build 

Oh this takes me back. I bought one of the yellow 2001 models when they were first released in the summer of 2000. I rode that thing all the time, loved it. Then in 2012 some jackass decided they needed more than I did.

Just picked up an 03 for a few hundred dollars that definitely needs some love. This build is super inspiring!!!

Bought mine in November 98 and I’ve still got it

im currently in the process of fixing up my old honda 300 ex, it sat for the past ten years ive i had it since i was ten now im 30 lolz i was rough on it but i got the electrical issues fixed as well as the piston chamaber honed. this guide has helped me figure out what too look at for giving it a fresh start again so i thank you.

Suspension is super important on a 400ex if you want to go fast because of the lack of power. If you have a suspension that can soak up the bumps it allows you to keep it pinned more often instead of letting off and struggling to get back up to speed. I personally ran Lonestar long travel a-arma with elke stage 4 shocks front and back with a Lonestar rear axle. Its been a good while since I had mine so I dont even know what is available. CT Racing 426 kit with stage 1 cam and the older 450r fcr carb was an amazing combination with the suspension because you had the power of a LIGHTLY modded 450, and if you had your whits about you then you could run them down on an XC race. Like I said, suspension is still key so you can crash through the rough stuff and spend less time trying to accelerate because the 450's will definitely do that better. Do those mods with a good steering stablizer, nerf bars or at least heel guards, and frame, a arm, and swing arm protection and you can be a very competitive racer. Oil cooling is another important thing to think about, and I also ran aluminum scoops to funnle more air to the engine because its air cooled. As far as intakes and exhause I ran a white bros exhaust and I experimented with various foam filters and had good success. Tires I liked the Maxxis gncc tires and to save a little cash I ran reinforced rims in the back and bead locks up front with tireballs in front and rear to prevent flats. It was a great machine, not the most powerful, but very competitive and lots of fun for all levels of racers/riders. In all I did have about $10,000 in the machin, which included $2,800 for the cost of buying the machine itself. Maybe I should have gotten a 450, but either way I had a good time and that is what is most important at the end of the day.

The best trail quad of all time

My first quad was a new 99 400ex in late ‘98. I had no complaints. Couldn’t hang with my buddies on the banshees in a drag race, but it out performed them in everything else.

5:00 RIP shifter

One of my favorite quad of all time 400ex best

You guys should do a build on a Honda TRX250R

I have built many many of these machines... the best for motor setup I have ever seen is a 426 kit 11.1 (93 gas) stage 1 cam 450r carb with a full exhaust and uni filter and upgraded oil cooler and fins.. it will run with a stockish 450s

More build segments pls! Great stuff.

Just bought a 03 400ex the other day, Full pro armor nerfs, pro armor front bumper, Razr tires all around, K&n air filter, the only thing is that it hasnt been used a lot in the past year so it has a hard time starting up but once its warm it runs very good

The 400 ex with the double light like that has always been my dream quad that or a raptor 700

Had an 03 300ex. Beat the hell out of it and it was a beast. Ultimately cracked the crank case and parted ways. Now got a 03 cr250

Y’all wanna do a giveaway with this atv?😂

Great build! Next trx300ex, trx450r & trx250r

I’m only 10 yrs old and my dad and I are looking to get me from a 250cc 4 stroke to a 400cc 4 stroke thanks for making this vid🙂

loved the razor 2's on my 07 trx450er. but sold it and bought a new 2019 rancher ES. kinda miss it

I have 2 of these quads. Love em there amazing fun

That's a minty fresh 99 400ex you got there...

Still the best all around quad after all these years

I have a 2002 Honda 400ex with a stage 2 hot cam with a 440 big bore kit and it’s runs lean and mean!!

Bought one brand new back in 2002. Some viewers weren’t even born...makes me feel old!! Lol

DAMN Do more vids about 400EX ! We love that !

Get a case saver for ANY sport quad. Its best $20 you might ever spend on your machine! Have em on both my newer Yamaha quads. Alba racinh makes a nice machined alum piece in various colors.

You guys should do a TRX700XX build!

this came out at the right time cus' i just upgraded to an 01 400ex from a trx250 ex and am learning the clutch. but the previous owners rode in sand and took off some skid plates and owned a atv repair shop so it has some cool stuff on it

Crazy how this one the Baja 1000 out of all of the other machines out there

Got mines since 99 and never had a problem with it,I hear all these guys with their 450’s always in the shop lol I’m glad I didn’t get one of those lol

I've got a 2004 TRX400EX sports 05 model.

The footy in this video is sick but I own a 2000 Honda 400 ex and its a beast

Best looking quad

Super nice EX ... actually want to build one to look exactly like that one ... Everything added fits n looks great together .. 💯💯💯🔥🔥🔥

You should do an xr400r enduro build next!

My buddies got Kawasaki's , raptor's 660 but ain't none of them tuffer than my 07 400 honda TRX💪💪💪💪💪💪💪💪 . When i say tuff i mean tuff.

Love my 2003 400ex

Awesome vid and edits and filming and bike

400ex the little brother to the Legendary Trx250r🤑

Good job, she's a beauty.

I had one of the first ones my dealer got in. loved that bike.

Had a 440ex with some aftermarket shocks and other various mods.. loved it. Definitely reliable and a great quad.

Got a 2003 400ex with moose racing cdi box airbox delete with k&n filter dmc alien slip on and weisco high compression piston I run 100 octane gas best quad i ever owned and more reliable then my yfz 450

400ex lives onnnnnnn...love mine

PLEASE do a stock or close to stock TRX250R Review then a build series you'll get alot of views

I had a 1999 400ex bored to a 440 years ago .. it was a good very good trail bike

I got a 2 stage cam and a bored out carburetor and it’s got a lot of power

The quad looks awesome

Best simplest most fun cheapest quard to own...

when can you guys make a yamaha raptor 660 top end rebuild ??

Digging the quad build videos

Freakin legend of a quad

You guys should do one of these videos for the 2018 honda trx250x

Sick ride..I had a 2000 yellow 400ex with a twist throttle, nerfed bars and a wp clutch 450 carrier housing thing was a beasttt!

God bless spread his word!

I have a 99 Honda 400ex runs great but I need to go through the motor

Thanks for this video

I LOVE my 400EX!!!

I have one to it’s race ready

Nice looking build! :)

Great Video!

Can you guys do an ltr build?? And then maybe a comparison to newer machines haha

I need that engine for my xr400 😃

I've never owned a quad. and even I know the first thing you do to a 400ex is throw those front shocks in the trash and at bare minimum buy stock 450 shocks with resivors

The one extra thing i would add is a motion pro race throttle it replaces the thumb throttle with a dirtbike style

Should do trx450r front shocks

Most reliable quad you can get that has enough power to have fun (after a couple mods)

To bad Honda doesn’t make the 400 or the 450R any more. Those where great sport ATV’s. My brother has TRX 450R that’s excellent atv. Honda’s parts and service Lasts forever so any one who owns one. Will be able to enjoy it forever.

A friend of mine had a similar year, a 2000 I think. The only thing I didn't like how high you sat in the seat. I had a yamaha warrior. You sat lower on it. Maybe I was just used to my quad. The 400EX frigging ripped tho

Yaya!

Nice build

I still remember when this and the Yamaha warrior were the fastest sport quads on the market

70 bucks for a top end? no way a blaster top end is even more expensive

Can you make a build video with a 2004 Ltz 400 if you get one

416 big bore and a cam. More mid range and top end. Not the 440. 440 heads leak oil and it's a low end build. Big gun full exhaust, open air box. Larger oil tank. Roll design Lobo 2 a arms. Rpm axle. Roll design swing arm +1 . Roll steering stem. Set of elka shocks. Renthal fat bars Omf scallop bead lock wheels 8 inch rear 10 front. Maxxis rzr tires or itp holeshots. Braided brake lines. Ac propeg nerf bars. Ac bumper. And a set of plastic skid plates. The aluminum gouges and gets caught up more than the plastic. Stainless swing arm bolt. Stainless tie rods from ricky stator, they wont bend. And oury waffle grips. Gusset the frame behind the upper front shock mounts, the top of the bar that runs down to the bumper, and the joint on each side of the oil tank, and the brace above the head under the fuel tank. That is a solid build that wont fail to finish any race unless you do something really stupid. It finished the baja 1000 after 4 years of gncc racing and 4 years of hard motocross racing. It was competitive until I stopped racing in 2010.

Love the video. I have a 2001 with full FMF everything. How much did all your parts cost? Mine too is from the snow belt.

What are the best years to look for and which are best to avoid?

I’ve still got mine I bought new in November of 98

Project raptor 700 next

How many decibels is the Lexx exhaust with the trail tip

I have that motor in my Honda 400xr bike

350 WARRIOR NEXT

Ure Jam nut on Ure axle nut should be against the axle nut.

Can you tell us what the total cost of the build was? Not including labor time. Just parts?

Do you think a 400ex is a good starter quad for a 16 year old that has little experience on a quad and a pit bike.

Are 400s good beginner bikes ?

Do a warrior 350 video

Im building my 2000 trx 400 ex and i will like to know the prices an how much money did you spend, can you do a listing

So I’ve had an 04 Honda 400ex for 8 months go riding all the time and last weekend I started it up was letting it idle and it cut off and I tried to turn it back on and it made a click and lost all power. I can’t jump solenoids nothing happens when I do, I can only bump start it. Is the issue the ground? If so where is the ground located?

The stage one cam gives low to mid range power btw not high range

What are the specs on the wheels and tires? Thanks! Dope video

In 1999 two of my buddies and I walked into a dealership and tried to buy three of them. “Metro Motorsports” wouldn’t discount them not even one dollar. We walked out...

How is a 2002 400/440 ex with stage 2 hot cams

I have a 2014 model 400x and thinking about putting some aftermarket fat bars on, where would you recommend moving the Key and reverse and neutral lights too ?

Should add a link to a complete build list

What are the specs on the front and rear wheels and tires?

I got the same one but yellow I wanted to ask can you change a twist throttle to a thumb throttle?

I love the 400 ex but the front shocks are horrible

still have my 2002 ex400, stock

What spacers did you guys use in the front and how wide is the back looking to make mine wider