Air box mod and snorkel removal for Yamaha wr450f and wr250f - free mods

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This is important free mod for your yamaha wr450 and wr250, bikes need to breathe. Snorkel removal and air box mod (air box opening) will allow your bike to have plenty of air.
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wr450 free mods
wr250 free mods
air box mod wr450f

[@yessir863]

Best dirtbike channel for regular guys who just love their dirtbikes Thankyou

[@dirtniron]

thank you sir! ;)

[@yessir863]

@@sendit1158 yeah I enjoy them, both nice guys who love their bikes, I'm a bit over bike builds though to be honest as most people cannot justify spending this much cash on used dirt bikes.

[@HochstartHarry]

Great thanks... I was really stuck at the snorkle removal today and thought id seen you do a vid about it, watched it and it worked perfect. I only did the snorkle removal though, since i was running late.

[@dirtniron]

Cool man, glad the video helped out!

[@TSGProDigy]

A good tip that will help with cutting the air box with a razor knife is to warm the blade up with a torch or lighter.

[@dirtniron]

Thanks for sharing

[@clashofkingsaddict9733]

Awesome videos dude, very comprehensive information on the wr450 f✊😎 thanks for this info

[@dirtniron]

Glad it was helpful!

[@BigBikeAdventures]

Looks like you just changed the wading depth of the bike. Need to keep that in mind when doing the Mods if you cross creeks often. Good channel subbed.

[@dirtniron]

thats a good point, I live in Southern California, we usually ride dusty trails and desert, wish we have river crossings and stuff like that around here. Welcome on board ;)

[@alexsgarage01]

Does anyone know the background music he plays while doing a time-lapse? Thanks

[@bikersoncall]

5:00 Wear gloves, heat the blade, keep it pretty hot and it will cut easier. Sometimes on plastic like this a soldering iron comes in handy, you need a thin tip, but bear in mind it can easily make a mess, not something that will look factory-finished.

[@robertwoods2505]

Very nice brother!

[@dirtniron]

Thanks!

[@gypsymanjeff2184]

Amazing on why they just don't do from factory .i mean it's already laid out ..least they should give you a cheat wheat on these mods..but hey gr8 vids Mr..just got an 03 wr250f..hope to use ur vids on advise..

[@dirtniron]

its same airbox as YZ model would have but WR needed to be little more mellow, so they blocked the holes. Also for some of the WR they need to pass emissions, as they come street legal.

[@jasondennis230dennis2]

anather cool video keep it up bro.

[@dirtniron]

Thanks brother!

[@oliverkoler7224]

do i need to adjust the carburetor after this mod because the bike gets more air ?

[@ballstank3904]

Shouldnt you increase jet size now considering more air is coming in?

[@SuperTelecom]

This is the only mod I haven't done to my WRs, purely out of concern for water getting into the airbox more easily. Realistically it's probably not a possibility, I'll probably end up doing it.

[@dirtniron]

Yeah, if you do deep water crossing it would probably happen

[@HochstartHarry]

Mine is a supermoto conversion so water aint a concern

[@frankiemarchese2978]

I like those bars. What kind are they? Im looking to get those exact ones on my wr, i want to get rid of the crossbar

[@dirtniron]

these are protaper easton ea70 I believe

[@Yeboiiii613]

Hey everyone. I watched this because I heard it’s a good thing to do but honestly… what does it do? Does it add power to the bike ?

[@NirHason]

Great How-To video man

[@dirtniron]

thanks Nir ;) how is the composition, angles, music, etc? (I enjoy your feedback) :)

[@NirHason]

It was smooth for my brain for 99% of the time so that's good. the 1% is that the scene lightning can be better, it's not something major because all of the necessary objects are bright enough but it makes me feel that the room is narrow (which I believe is not that far from reality) . With the right light you can fool the viewer mind and makes the brain thinks that it's more spacey. Less dark parts in the scene makes the video looks more relax and even more professional. I think you can use some softbox (goo.gl/CuX3Vn) with warm/cold light to light the background and one to light the front of the scene (where you're standing). That way you'll create more depth in the frame :) BTW - did you used the zoom lens? I talking a lot and actually all my videos are crap since I don't have enough time to actually film multi angles and edit it afterwards. So I really appreciate your effort when making those videos!! :) If something is not clear let me know and I'll try to help you more (maybe via FB).

[@dirtniron]

thanks for the feedback Nir, yes I am using zoom lens, cant use 50mm for these kind of shots. I was thinking about getting some softboxes .. lets see how many tshirts can I sell this month, maybe I will invest a bit into the gear. I was thinking to get new zoom lens I like STM lenses, they focus well and dont make noise, maybe I can just leave it on face recognition focus all the time.. right now I focus manually and change it each time I change the angle, it takes time specially if you are one man show. We can chat more, I can always use good advice, thanks bro!

[@NirHason]

I'll send you IM on FB

[@estebannavarroperez9014]

hi Mate! Thanks for your video. I have one question. If ONLY remove the snorkel should I recarburate adjusting air- fuel mixing? or its not necesary? Greets

[@dirtniron]

it depends how she runs, if its too lean then yes. At least adjust the fuel screw

[@johnslechta]

Do you have to do anything in the carb for a fuel/air mix when u do this mod?

[@dirtniron]

I went with jd jetting and rich needle, the bike ran really great

[@Wide000]

To the ''handsome young man from Canada'' we see at first: man, your chain is much too tight! You will damage the bike running like this! :) This will prevent the suspension to work properly and you will end up with damaged bearings, hubs and cases.

[@akathecanadian]

Wide000 I know, I had my engine rebuilt over the winter. Haven’t ridden it yet and had the swing arm off for easy access to the engine

[@Wide000]

Great news! Be carefull with that. It needs a fair amount of slack.

[@akathecanadian]

Wide000 yep. Will be fixing that soon. No sense on spending the time now because there’s a lot of snow where I am so I won’t be able to ride it

[@Wide000]

I am in Québec. So I am a canadian and we have a lot of snow here too. Can't wait to ride again...

[@akathecanadian]

Wide000 st Marc sur richelie? I got a few friends in that area / Beloeil

[@alessandroterlizzi3130]

hi, I have your same bike, I made your same changes but the acceleration up to 1/4 does not work well, can you tell me which pilot jet did you use?

[@dirtniron]

dont remember exactly, check my jetting video. you might be loo lean..

[@lilmidgey6927]

also btw when youre going on inspection will they reject you cause of the mods or will let you pass and get the license ty

[@dirtniron]

we have no inspection for dirt bikes, I am not sure what kind of inspection they do where you live.

[@GamerPro735]

how is the wr450 going. do you think a ktm exc/excf is better at trail riding/enduro?

[@dirtniron]

so far I am impressed by WR450, honestly first i just wanted to flip her but after few rides I decided to keep her, at least for now. Love gearbox, suspension, engine too, plus I am currently working on few mods so it should be running even better. I would love to have a chance to do some riding on 450exc so I can compare it. I rode husky 350te and can see big difference, specially in a weight. WR450 has a lot of power and feels more planted than the husky.. but again it all depends what kind of riding you do, probably wr450 would not be my pick for gnarly single track.. I still need to ride more to have better feel for the bike, for now I am very impressed how this 14 years old bike runs!

[@aaronfitzpatrick1349]

My 03 wr450 doesn't have those outlines to cut out those holes on the airbox

[@dirtniron]

just cut the holes then.. no big deal

[@mxrider2strokebraaap54]

Nice video I can’t wait for the next one😄👌

[@dirtniron]

thanks man, coming next week!

[@renedelafuente123]

This modification looks pretty easy. Can this be done on the 2012 wr450f dirtbike? This bike is fuel injected, by the way. Thanks for the video. Keep'm coming.

[@dirtniron]

I believe so, check out your airbox... fuel injected wr450 are little different, you might need another map once you get more air, bike might run too lean

[@brycemitchell5668]

By doing this do you need to adjust the carb or jet at all

[@dirtniron]

yes, I think you will need to play with it to get the maximum out .. will probably need more fuel, play with the fuel screw first - I have a video about it. also JD jetting is a really good way to dialed it in, runs really good with that kit, I have a video about it as well. good luck

[@TheDesertsweeper]

You would want to go to a larger main jet to take advantage of this mod, assuming there is a carb and not FI

[@dirtniron]

yes, you need to give her lil more gas. I went with JD jetting, used rich needle and the bike runs awesome

[@TheDesertsweeper]

@@dirtniron JD Jetting is the way forward without a doubt. For those who cannot afford the JD Kit, drop your needle-clip a notch (to raise it) and get a larger main jet (cheap) as a start. Do some googling - plenty of good advice out there!

[@rafhood6002]

Can we not say at least that there is one drawback to an air box modification, which is that carburation is less stable when a gear is not engaged or while waiting at a trafic lights (street legalized dirt bike), hence sometimes using more fuel on these moments ? Thanks for your advice.

[@dirtniron]

Personally, I haven't noticed any drawback of this mod. My wr is very stable even in neutral, it can idle for hours..

[@rafhood6002]

Thanks. Then I'll keep experiment with my open air box.

[@a64738]

My 450 was more unstable but it was totally worth it for the big gain in hp and general much more power, it felt like it went from being a 300CC to 550 lol.

[@rafhood6002]

Thanks. I drove 180 miles 2 weeks ago with my second-hand 2003 crf450r on normal French roads in one single sunny day, i had an appointment somewhere, and in the end i was satisfied with the bike and the gas mileage was normal and fairly stable carburation. Although for regular use i'd go for a less performant bike, for environmental reasons. I don't mind to be patient on a slower bike and use less petrol every time i can.

[@BlackwaterAquatics]

Becareful having too many holes on your airbox, you mightbbe drawing in turbulent air which can cause irregular air intake especially at speed.

[@lilmidgey6927]

if i goes a bit offroad and lets call it 'have some fun' can dirt get in there trought the sides and upper part? i dont wanna damage meh bike

[@dirtniron]

you have your air filter that would not allow the dirt to get in the engine, keep your filter clean and oiled and there is nothing to worry about. My RMZ has 2 holes straight into the air box, bikes need air

[@abucketfullofpandas6463]

Dirt N Iron what I'm worried about is things getting in with the battery. Is there potential for this to happen after doing this ?

[@Phil2stroke]

Hey Rado where did you get your rack? (The one whith the oil bottle on top?)Thank for your content keep it up love the show!

[@dirtniron]

I am not sure, I got it from some storage, I didnt buy it ... people already asked me about it.. its pretty handy and sturdy

[@Phil2stroke]

Ok Thank you!

[@virgiliobarrientos8352]

Does water get in there when washing the bike?

[@dirtniron]

little bit of water is no big deal, it will get dry till you go riding next time.. plus its not really direct opening. you would have to spray water right in under the number plate

[@alessiobosio315]

Excuse me, what maintenance do you do to your wr? What about piston replacement?

[@dirtniron]

i sold my wr, didnt have to do the piston or anything like that while I had it

[@alessiobosio315]

@@dirtniron i have another question: on this bike the vibrations are a real problem or just a marginal one?

[@dirtniron]

@@alessiobosio315 it was never a problem for me.

[@alessiobosio315]

@@dirtniron thanks man🙌

[@55mihael]

do a comparison of it running with more air.

[@dirtniron]

yes I will do it once I am done with all the mods and jetting

[@axismiracle521]

Spray the utility blade with wd-40, and it will really help cutting plastics and rubbers.

[@dirtniron]

thanks for the tip!

[@domenbonca4877]

Great video I had the same bike as you but then I sold it but now I regret it because it was a great bike raiding and for racing

[@dirtniron]

yes, great bikes.. I first wanted to flip it but after few rides I fell in love with WR

[@adamgodin3242]

Is your wr missing a sub frame bolt

[@dirtniron]

I think that's where the side panel screw goes

[@dirtniron]

Oh I see what you mean. There is bolt from the other side, this side is threaded

[@flemishadventurer9503]

how about water getting into the airbox?

[@dirtniron]

it will get in of course, but thats the same even before this mod, only thing that changed is that now I lost few inches when crossing a river, I cant go as deep as before, but in real life it doesnt make any difference for me, there are no deep river crossings where I live and ride.

[@mickharryharris6866]

Hope your a good swimmer !

[@a64738]

After what I can see with this modification together with different jetting and less restricted exhaust you go from the "official" 42hp at the crank you pay tax for in Norway to 44-48 hp at the rear wheel which is about 50 - 55hp at the crank roughly. Seems most of the road legal dirtbikes have similar gains from doing thees kinds of mod as they are all very restricted to fill noice, emmisions or hp restriction demands from authorities.

[@dirtniron]

sounds right!

[@desertrider325]

What year is it?

[@dirtniron]

2004

[@allthingsmotors3691]

What is the year of that bike? I think mine is the same

[@dirtniron]

2004

[@allthingsmotors3691]

Oh ok thanks bro mine is close it's an 2006 and I'm trying to figure it out but having trouble (it's my first bike)

[@adrenyjunkies5370]

Would you need to re jet it?

[@dirtniron]

Yes I am going to rejet after I am done with all the free mods

[@tomasnokechtesledger1786]

Carburated? Yes! F.I., nope.

[@godlyxmp4746]

What does it help with

[@dirtniron]

more air for bike, it runs better

[@spymaine89]

why not remove air box completely ? many dirt bikes dont have an air box just filter

[@dirtniron]

it will look weird I think, this is sufficient

[@stefanpuffer]

Can we see your before and after flow bench and dyno results?

[@orlandomoreno5827]

Hello, I'm a follower of your channel, buy a WR450 F year 2005 and I'd like it if you can only add the subtitles in Spanish please. I would really appreciate it . Thanks and greetings from Chile

[@dirtniron]

hi Orlando, I am not sure how to do that. my english is not perfect and sometimes google doesnt understand me, so its hard to use automatic subtitles, I would have to type everything, I did it for few videos but realized that its too much work. Unfortunately I dont have time for that. But it there is someone out there willing to do that I am open to it. Let me know

[@SwormCycles]

I realize this is an older vid, but if you see this question, please advise. I am hearing that if you do this mod that there may be a need to re-jet the carburetor. Did you ever find this to be the case? Thanks

[@dirtniron]

I would recommend to rejet it anyway, stock jetting is too lean. I did all the free mods and got jd jetting kit and the bike runs absolutely amazing. I have videos showing it all, just search my channel. Have fun

[@jayppop3333]

Cracked the box on a 15 pray for me yall

[@findvoltage]

Hello everybody🐻

[@mickharryharris6866]

Hello to you I say !

[@akathecanadian]

Damn my bike looks better than me

[@dirtniron]

You look good too ;)

[@tomasnokechtesledger1786]

I put a lycra cloth around the box, covering the holes, as a prefilter. But you should know where you can get to. They are closed like that, because WRs cross rivers and other deep waters, you know, you can get a bent rod from water ingestion lead on to hydraulic blockage ... There are reasons for different designs and purposes. Those garage engineers, rsrsrsrs...

[@dirtniron]

we have exactly 0 river crossings in so cal ;) I prefer to have uncorked bike for 99% of its life, If I ever get to the river I would probably look for shallow crossing or a bridge..

[@tomasnokechtesledger1786]

@@dirtniron I understand, but the vid isn't for SoCalis only, right? So you can give a hint on the description if you don't want to colaborate in a lot of bikes ruined for no betterness.

[@dirtniron]

alright Oscar, its a common sense to understand what is the water crossing level on the bike if you cut the hole in the airbox. This is the common mod performed by many people on these choked bikes, only reason for closed airbox is to pass emissions and sound check.

[@tomasnokechtesledger1786]

@@dirtniron Sure for you and for me. But the rides that change oil in the shop won't have such "common" sense. And beeing an fairly easy job to cut the airbox like that, we should let them know that the max water level will decrease a lot after it.

[@CfuenmayorJr123]

if you’re doing deep creek crossings on a WR… maybe you’re on the WRong bike

[@Dramadelta]

The grey cable & the carbilater let's say improvements are okay! But the air.... I don't think so m8. After all I don't wanna clean dust all the time;)But if someone need (YZF air plus mods at he's WRF )why he don't buy a YZF ?hm?Cuz if you change stuff too much then probably you gonna burn the bike.So better take YZF if you're close 2 mountain,if not then WRF is not made for giving 100% of her power ;)believe me I was destroying dirt bikes before cell phones and internet lol!

[@bigronwaggles404]

Unless you know more than engineers that made the bike don't cut your air box!!! yes take out the silencer snorkel but if you valve your bike don''t don't don't cut your air box you are asking for problems.My bike had the holes cut out and it ran like crap. I closed them back up and presto better performance

[@dirtniron]

sorry, but thats not correct, you seem to be little afraid of jetting.. yes, if you open the airbox your bike will logically have more air and run lean, thats why you need to re-jet the carburetor, its really not that hard to do it and the results are great.. average technical guy can do it no problem, bunch of videos online, on my channel as well.. the only reason for that airbox to be closed is to pass the emissions, definitely not to make bike run better

[@rickjamesbitchrickjamesbitch]

If your doing hard enduro don't do this they're not trying to restrict the engine they're trying to keep dirt ab water out of the give I've had my wr under water up to the seat if I did this it would of drowned the engine

[@gueroloco6334]

What year is it?

[@dirtniron]

2004