Problem Found On Honda 400ex...Worse Than I thought!

I end up tearing into my 2000 Honda 400ex quad to diagnose a problem it was having. It ends up the problem is much worse than expected. Let's fix it. #Honda, #TearDown, #400cc,
►SUBSCRIBE: / @2vintage
►MY SECOND CHANNEL: • New Polaris ATV Snow P...
►WEBSITE: laptwo.com/
►FORUM: 2vintagerider.com/community/
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
►►► ADD ME ON ALL SOCIAL MEDIA ◄◄◄
► FACEBOOK: / 2vintageyoutube
► INSTAGRAM: 2_vintage_ / 2_vintage_
► SNAPCHAT the2vintage
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
► EMAIL FOR BUSINESS INQUIRIES ONLY: [e-mail]
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Thanks for watching and subscribing!
New videos every week!
The following video features activities performed in controlled environments by knowledgeable persons. DO NOT attempt to duplicate, re-create, or perform the same or similar activities at home, as personal injury or property damage may result. 2vintage( Joe Weber, the persons shown in this video and ANY CONTRIBUTOR, ARE NOT LIABLE FOR ANY such injury or damage. ALL 2vintage( Joe Weber) CONTENT IS FOR ENTERTAINMENT PURPOSES ONLY.
2vintage (Joe Weber) makes no representation about the sufficiency of any safety precautions and equipment used in this video.

[@2vintage]

Well I was hoping for better but it is what it is! Any suggestions on what parts to use for this build would be great! Need Motorcycle, scooter, car and truck parts? Check out www.Laptwo.com Please SUBSCRIBE and LIKE the video if you enjoyed! It really helps me out a lot! Thank you for all the support!

[@elianderson3956]

I’ve never been let down by wiseco kits I would recommend them and also would love to see a big bore on the 400 vs the 450 that would be a sick race

[@badboytroyhaase3018]

Just hone that cylinder she will be fine change tje crank to a new one and thats called lower conecting rod bearing

[@jasoneaster333]

Go back with all Honda OEM parts bro the best puts out the best meaning Honda parts are you best option bro great job on the vids too

[@juniorfuller6829]

I am pretty sure that it is best to check the voltage when the battery is under load

[@MrATOMBOMB420]

Get a stroker crank and a 440 big bore top end with a high compression piston have the head completely ported

[@2vintage]

Laptwo.com is now selling Vortex Cahin and sprocket kits. Our seller Chris works directly with the company and trys to get the best possible deals! Here is the link to the kits if anyone is interested! laptwo.com/atvs/honda-trx400ex-sportrax-four-trax-vortex-cat5-chain-and-sprocket-kit-1999-2000/

[@jakeniewold3094]

A lot of times crank and bearings get overlooked when doing a rebuild, maybe just because splitting cases seem challenging to alot of people, but once you get past the first one it get easier👍🏼from there on. Your doing good sofar keep it up👍🏼👍🏼

[@vincentreysen3288]

Hey I actually got the kx80 from you last year! That thing rips! It would be cool if we could ride some time

[@playboihunty4431]

Where you live? I’m from Madison

[@Builditathome-Restoration]

I would love to ride with you got some pitbikes from the build vids. But one problem i live in ghe Netherlands

[@vincentreysen3288]

@@playboihunty4431 south of Sheboygan

[@georgeduckworth4452]

@@vincentreysen3288 Port Huron!

[@moto_garage_3973]

Fun fact a battery at 12.1 volts is a dead battery. Battery’s need to be from 12.4-12.6 to be considered good

[@jbknowles1812]

Hey don't feel bad, I just learned this at 45.

[@11GalleryATV]

@@jbknowles1812 yup ... my battery is 12.6 ... and while running should be above 13 volts ...

[@jbknowles1812]

I aint good at KZbin always have used it ALOT more since lock down. Did my reply only go to you? Cause I was trying to tell 2vintage not to feel bad. Ha. Do I gotta @ them?

[@11GalleryATV]

@@jbknowles1812 No ... I just replied directly to you from your comment here but they are all visible to everyone (by replying to you, you get notified that I replied is all)

[@sandmanbub]

Might as well install a stroker kit.

[@davidblum_]

Imagine

[@DmanFpv]

its the connecting bottom rod bearing the crank bearings are fine... you can rebuild the crank at the shop or just get a new one. Excited for this build btw!

[@josepulido4582]

keep doing what ur doing man, love watching ur channels. It helps me in many ways in learning things about these bikes thanks man foreal🙏🏽💯 keep doing what you're doing

[@joshbannon8989]

I’ve never rebuilt a bottom end. Always stressed about splitting the case. The transmission side and all those moving parts. Looking forward to watching you do this to learn how it’s done.

[@2vintage]

you can keep all the transmission parts together when you tear it down. It is pretty stressful but not horrible haha

[@sevendyseven4090]

The previous owner obviously abused this motor by forgetting to spray the crank bearings with wd40..

[@twisted-xh6066]

That's a joke isn't it....

[@sevendyseven4090]

@@twisted-xh6066 Not in the least! And further, if you look real close, the previous owner also did not lube the cam lobes with vaseline either!

[@twisted-xh6066]

So you'd intentionally spray the crank bearings with wd40???

[@sevendyseven4090]

@@twisted-xh6066 Before lubing with WD, it is a must to spinkle some sand on the bearing first for longetivity (sand from an ant hill or the beach works best, it is fine enough to get into the bearing races)

[@twisted-xh6066]

@@sevendyseven4090 ohhhh ok I thought you meant you would only use wd 40

[@charlieshell5231]

That means that the eBay kit did just fine

[@zoopinc]

Charlie Shell ebay is king

[@charlieshell5231]

@@zoopinc yes

[@brianj123458]

I've had a cheap ebay kit on my banshee for 2.5 years so far without a problem. But maybe I just been lucky

[@charlieshell5231]

@@brianj123458 nice, I've had one on my Timberwolf 250 for a year and no problems

[@reggiexp69]

@@brianj123458 what??? you got those 150$ kits? i mean i saw piston and cylinder for 150$ on ebay for banshee... im getting oem ones 2nd hand cause i dont trust the 150$ ones, i got a cracked cylinder (the hole engine was froze and rust/water in crank... hope gearbox is fine)

[@tomphillips2473]

Good find before it let loose or froze permanently... Got the same issue on my 87 XR/XL 600 project bike. Tore the XL engine apart and my rod is almost frozen to the crank.... but i'm doing a complete rebuild :-) Got a great local shop going to rebuild the crank for me.

[@logiescrappychannel8646]

Yooo I love the vids! At school waiting to watch your videos!!!

[@outlawtv2557]

Hey man, ive been watching for a few years now and you have inspired me to start flipping dirtbikes, i bought a 1994 kx80 for $100 and put a new top end and bored the cylinder so i have only put $250 into it so far and im planning on selling for $800-$1000

[@_T_R_E_V_O_R_]

Well I guess that that means the Ebay parts didnt fail 🤷‍♂️ Maybe well u have the engine apart u replace the ebay parts with oem parts

[@GBDunknRollCD]

If it keeps blowing up check the screen on the bottom of the oil tank, also make sure the oil pickup in the case is clean. If it keeps blowing up it may be an oil pump failure or clogged oil return screen

[@867diesel]

man i gave this video a thumbs up as soon as you said you was going to replace the piston with a good name brand . very smart move . never run cheap internal engine parts ever lol

[@stewartgriffin3192]

Literally just finishing up a rebuild on a 400ex with a motor that was totaled. (New bottom end, top end, full timing kit, full new head, cam, new valve cover with rocker assemblies, even all new bolts.) I've learned a thing or two. No.1 This motor has a one way sprag on the flywheel. It will only turn over one direction. If yours moves both ways, then that is likely broken. You have to pull a side cover and pull the stator housing/ flywheel with a special tool or a generic 3 hole puller and 3 semi long 8mm bolts. You dont have to pull the motor to look at this but if you are planning a full rebuild anyway it will have to be done. Just a heads up in either that is your problem or you have to order more parts. No.2 Im not saying that your crank is good but, even your new crank will have side to side play. Its the up/down play that counts. No.3 That piston and cylinder looks exactly like the Weisco top end kit. I would do a little more digging and micrometer the rings ( cylinder wall to piston ways) and check there ring gap when installed. Just pop them off and put them in the cylinder. Use the piston upside down to make sure the are square in the bore and use a feeler gauge. I dont recall exact spec but .005 rings a bell. Whatever repair guide you use for torque specs should have it in it. Just a couple things that may save you some time and money. Have fun. Keep the vids coming

[@AthenaOffroad]

Love your videos! And love the 400ex! One of the best things about the 400ex is they are super easy to work on and parts are everywhere for them!

[@brianteddy3400]

Great video, im glad you found the problem so you can fix this bad boi.

[@soloskywalker]

Keep it up man, I love the older stuff. More ATC's!

[@jayeagle8363]

Love 400 ex builds ...keep em coming 🤘👍.try wheelies on the road with some speed it stays up no prob if your smooth on the throttle 🤘cheers from canada

[@RealSuburbanCowboy]

You got this dude. Bottom end is no big deal. If you want any of that stuff vapor honed, let me know. Send it to me and I'll do it while you wait for your parts to arrive.

[@2vintage]

Thanks man I appreciate the offer!

[@jakejames1977]

Piston and cylinder are fine just make sure tolerances are to spec and reuse it . I think the head and valves are fine too. Top end sounded fine when running. Just get a complete engine gasket kit and seals and new crank assembly with new crank bearings for right and left. Even a good used crank would be fine. Or install a new lower rod bearing and race than have the crank balanced with new right and left crank bearings. The cheapest easiest quickest way is find a good used crank assembly ebay and complete engine gasket and seal kit . Then throw it all back together. Had to do the same thing to my crf 450 . My engine was pretty much junk . I used a used crank with new bearings and seals gasket kit new top end. Quick clean up of the valves .put it back together. It's been two years this October and zero problems still runs like a beast ..

[@BLSdarrin]

The cheap always turns out expensive

[@gtisid]

your manual should tell you the lateral tolerance of con rod. i’d say crank case bearings are the problem. but if you feel up and down play on rod that’s no good either. seems odd there was no knocking when it ran

[@2vintage]

Yeah I think all bearings are bad. hard to tell but once I get the cases split I will see.

[@loganjones9471]

Love the vids man

[@m8fusion712]

Awesome tear down video man

[@chadriddle3517]

Who thinks the guy that sold it knew it had this issue??? I sure do !!

[@1ksquid07stuntlife6]

440 kits are pretty popular with these . I'd go with a hotrods crank and rod set up. A good forged piston of ur choosing wiesco , JE , collies, etc . And a mild cam while ur in there bud . Perfect opportunity for u to build a motor for one to keep for urself .

[@bryceswan7936]

Check your air filter and intake tube bet there is dirt getting by your filter

[@theexisting1514]

You should do a big bore on this one if you're gonna replace the piston and also do a bottom end. maybe a 416 or 426

[@jasoneaster333]

I could tell it was the big end of the rod as soon as you pulled the jug,I seen the discoloration on the crank from where it got hot an seized common failure point I always replace every bearing on any kind of rebuild,think about anything inside the engine goes there's always metal deposits so where does that metal go,uh in the bearings

[@slabdaddy4209]

Sounds like bad rod bearing you can hear a knock at idle

[@andresescalera1324]

No probably the carburetor is not idling

[@slabdaddy4209]

@@andresescalera1324 👍😂

[@liveactionyeeyeeyeeyeet5996]

@@andresescalera1324 do you ride the short bus?🤕🤕

[@masonl1953]

LIVE ACTION YEE YEE YEE YEET!! Do you not get the joke

[@Georgebd2]

Possibly could be one of a couple other things I had a similar problem with my snowmobile and it turned out I had a bad crank seal and I had replaced a ton of other stuff before I figured that out due to many other suggestions and trying to do the easy stuff first also known to do that as far as electrical goes is a bad pickup coil

[@XeClassified]

Needs new crank or that one rebuilt. The connecting rod looks locked up but might as well throw in new bearings as well

[@ozzywalker5363]

Do the striker and big bore kit and compare the difference between stock and fully built

[@jodymayne]

My 04 trx 450r crank bearing just shitted out have more or less the same Problem I’ll be tearing mine apart soon!

[@benjamindavidson632]

Piston, rings and cylinder are scored. Probably from bearing material going through the oil. Make sure you clean all oil galleries before you put it back together or you'll score it again.

[@punkin7144]

There should be shims on each side of the lower connecting rod where it connects to the crank.

[@leviprice7215]

I love your videos 2 vintage

[@mmgtl]

Those scratches on the piston skirts are from dirt getting past the air filter

[@finster7582]

If its ur 1st time splittin cases, good luck! Ive done alotta rebuilds myself but at this point, id rather let a shop do it with a warranty. ..😆👍👍👍👍👍👍👍👍

[@meanbird9843]

IVE been waiting for this

[@gokarting1018]

Buy the wrench rabbit kit comes with hot rods crank weisco piston and comes with all the trans berings and everything u will need

[@miggs2964]

pro x con rod kit send crank to shop to swap con rods put new main bearings in cases then build back up

[@taylormillard5223]

Please do an in depth on rebuilding the bottom end

[@978twostrokegarage2]

Nagura piston rings are the worst piston works great but recommend use wisco rings better compression and less oil burning from oil rings. I had this problem and funny thing came out to be the stator side crank bearing so must be common

[@IllestA4]

Rod bearings are bad, regardless you’ll be replacing them all!

[@Builditathome-Restoration]

Good job bro

[@gibby4517]

I would replace timing chain too your that far into it already, hope to see it running again

[@dillongreen1045]

Everytime that rod hit the cases...it hurt my heart a little

[@jamiecollins2117]

I would replace the oil pump also.I would also use a vertex piston kit

[@07scoobywrx]

Rod bearing!! And you should replace the crank bearing also while it’s apart! And oem parts ftw

[@rigguyjt]

When I saw that blue color on the crank I could tell before you tried to move it. It takes a lot of heat to discolor metal.

[@genebrewer1422]

Glad to see I'm not the only one to see that and no one else saying anything about it

[@Yamaharider98]

I made the suggestion that it was the crank the first video you ever posted with this thing, before it was ever running

[@2vintage]

Nice!

[@motomechanic5711]

i definitely don’t recommend using an impact on any engine bolts. crack the bolts loose first with a ratchet then you can take them out the rest of the way with an impact

[@mcarbajal5628]

You should repaint the frame black and the arms but idk what color

[@sixpacksandsrts9122]

Any crank has side to side play at the rod bearings. It’s the up and down that’s a no go

[@jonny3024]

For piston I have very very good luck with those and I race (250) class and when ever my top end goes I buy vertex and I get another 130 hours out of one (racing)

[@nicholaswoods670]

Id definitely be chucking in a new cam chain and factory adjuster them adjusters are junk the chain stretches and when u adjust them out factory spec with them adjusters the chain has to move further and can cause problems with timing and when u took the chain off it looked really stretched

[@chathamguy1able]

that is a real nice motor that the guy said it was rebuilt ------ good luck getting the motor out i had a hell of a time getting the swing arm bolt out witch goes threw the motor on my 2002 Honda 400 ex ----- go with a good piston and rings ----stay away from the cheap pistons and rings

[@kylecaspersen1571]

Side to side play is normal the cylinder hold it up right the up and down play is a problem though

[@thanoss3038]

i can tell you for sure aasa is a great company in greece at least. I bought parts for my crf 450 from aasa it was kinda pircy tho...Also made my Honda 125 a good 200cc its perfect it didnt blow up its been like this for 1 year plus 200cc 23hp i dont really know if its good or not the hp but its not only for racing you can take it for a normal ride or do a lot of distance without shuting down engine.Sorry for bad english

[@colinperkins8794]

Your gonna need some beer music and time for the bottom end

[@larrywarner9314]

Id use a hot rod crank if it's reasonable priced

[@thomatyessir9123]

I’ve had 4 400s oem crank always !

[@korey7733]

Splitting the case on my 05 tomorrow :(

[@codyweien4513]

Side to side play is fine. Any up an down is not. And judging by the blueng on the crank and trashed piston, it's running very lean.

[@evanwilliams2602]

Easy tip. Drain the oil first if brass is found in oil then its crank bearings. Very few parts in engine contain brass

[@usmcchet1]

The crank lobes look a little blue also

[@DaltonScharberg]

Perfect timing ;P

[@douglassullivan1110]

Hope you get it runing rifht

[@11GalleryATV]

you should replace all the bearings in the case ... crank, transmission, and counter balancer (buy OEM) - $180.00 will get you a HOT RODS Complete Bottom End Kit from MotoSport

[@georgeduckworth4452]

Batteries produce voltage. Voltage don't go to it.. unless it has a charging system..and it needs to be running for that

[@GBDunknRollCD]

I just had the same issue thought i blew it up but it was the stator, would run if i jumped it

[@GBDunknRollCD]

It would also die if i gave it throttle due to weak spark because of the stator

[@quadbrothers5801]

The old battery shit itself. Things don’t run right on low voltage. Not sure what the other issue if not issues are.

[@micflynn1]

Also... Check you OIL PUMP, it may be wore out and not pumping the right amount if any oil to the top end. Maybe why he went Thur so many piston n cylinders, no oil flow.

[@adambishop333]

The cheap ebay rebuild kits are worth the money had one in my old 400 for about 6 months or so when i sold it.

[@darianspowersports6907]

the rod bearing is what went not the crank bearings. Id still go ahead and get new crank bearings.

[@popandrei8927]

What motor is better ? With 2 camshafts or 1 ?

[@BeStrong-nf5nc]

What do you do as a full time job?? I was wondering, or are you going to school if yes then what are you studying?

[@SubiBrothers]

My Honda is kinda bipolar it only has good power when it's dry outside 😂

[@24BLUEELMO]

Get the hot rods top and bottom end kit

[@PopVtecZ]

Stroker kit with 434 big bore and bigger carb, monster machine

[@sixpacksandsrts9122]

I have used eBay kits from everything from weed eaters. And quads and bikes. To cars an heavy equipment. Very rarely ever had a problem. THE MAIN THING THAT IS A PROBLEM are the rings. 99% of the time they need gapped. People don’t do this and the thing will seize up.

[@golem-cx1lg]

Ngl it would Mach up well sitting next to the grey quadzilla you had

[@codakirkpatrick9980]

I think it's the Crank bearing

[@OneWheelTy]

Damn you can fix just about anything

[@usmcchet1]

oil pump not getting enough oil and when it gets hot it shuts down (seizes up) just a guess.

[@forwards3214]

What battery do u think a 200cc engine need?

[@budd2018]

Its hard listening to that back ground music without Brent dancing around on screen with his lobster claw.

[@miniquadricers3148]

Love this bike

[@codyweien4513]

That namura piston piston is EXTREMELY worn. The skirts should be solid black.

[@bikelifedame9509]

Where did you get the plastic for that bike

[@unsafeluminosity1444]

Do a stroker for more power

[@arcticcatkickass]

My prediction was crank bearing also! Lets see

[@markworkman9224]

Since it has to be rebuilt maybe a 440 BBK and stroker crank 🙄

[@matt12251975]

These Honda's are great, but it would be wonderful if you checked out a Raptor 700r big bore...🛵🏍

[@vice8463]

I'm going to be rebuilding my 300ex that I redlined for too long and now has no compression... if anyone has any tips that would be awesome, I've never worked on a motor before and I don't want to mess it up,... I'm planning to get a 300cc big bore for it and hopefully if the valves don't leak I will put it back together and be riding it again, should I replace the cam bearings, cam chain, or anything like that in the top end, etc... please reply and if you do thank you for replying.

[@chadriddle3517]

What about going back with a 440 big bore kit ? Lol they are super torquey