What The Hell Is A Crankcase Breather?

In this video TJ breaks down all you need to know about the crankcase breather On a Honda VT750

[@mick-tl5ui]

Very simply explained. Just what i was looking for.

[@yasineorion9264]

I thought I was cool and had the little pod filters replacing the crankcase breather tubes on a 1980 cb750 until oil was leaking out of places where I know had good seals. I applied the concepts in this video and reinstalled the tubes and no more leaks. Thank you.

[@stevenpfleuger5639]

So, if this is what’s happening, and oil is spouting or seeping into gaskets and what not, do those need replaced, or should they be fine once the breathing is under control?

[@bananas8779]

Thank you so much. Oil was seeping out of the valve cover on my 92 Nighthawk 750 so I changed the gasket but to no avail. Now that I relived the pressure no more leaks.

[@rezaarjmand7866]

IT exactly happened to me. put smaller hose into the breather tube ( sporster 1200C ) to take the air and oil out but ended up having oil seeped out of all the gaskets around my cylinder. he is 100% correct.

[@alexjb99]

One of the best explanations and recommendations. 👌🏽

[@priyadarshidravid6929]

Thank you mate for your description; helped me understand breather function (split breather hose) in my audi a4.

[@MurkRoyale]

Great video man! I also found that the little filter gets hot, with all the crap in it, and it starts to steam out a little smoke which is annoying.

[@TJBRUTALCUSTOMS]

yep, and it prevents the bike from equalizing pressure!

[@paultoomey7016]

Hey thanks for explaining that very clearly hi Charlotte was some kind of a drain for the battery box actually. Mine had some kind of filter on it it’s a 99 Honda CB 750 but I just clipped that part off and moved it where it can’t be seen so thanks again appreciate it.

[@paultoomey7016]

Don’t know where Hi Charlotte came from I was trying to explain that I thought that it came from my battery box. So thank you again for explaining that hose for me

[@charleshaulk9677]

I appreciate this video, it definitely helps installing an aftermarket air filter. Because I did not know what to do with the crank case hose. This helps.

[@TJBRUTALCUSTOMS]

Thats great news! I love hearing that the videos actually help people! Thanks for the feedback and the comment charles!

[@jaywinters2483]

Thanks for the good camera work so we could see well.

[@moisesguerra4187]

Great advice brother. Definitely will be removing the box and running a hose to the ground.

[@andrewjamesescolano5225]

helps a lot.. now i’m decided to buy a breather .. thank you and have a great day

[@GS850ray]

Thanks ... explained how I blew out my already worn out valve cover gasket !

[@thecrossroadstavern1447]

TJ… Question. Why a hose at all? Like, do you know the design reason why that can’t just be a weep-hole or an open port, and why it instead needs a hose run down to the ground? EDIT: Just watched the second Crank Case Breather video. That breather box doesn’t just output air. It outputs particulates and oil that you don’t want blowing all over your engine and your crotch while you’re riding. That sound right?

[@kensmith9334]

Good info on crankcase breather! My 1978 750K Honda has a hose plug and recommends draining it periodically, which I do, and discolored yellow fluid drains out! Will now leave it unplugged! may be oil and water, but not sure!,,,,Thanks' for the video!!

[@jameycampbell8096]

I have a vengeance chopper with s&s sidewinder motor and it's pouring oil out of the crank case vent line.Its not overfilled with oil and it's running good

[@Royoyoyoyoyoy]

Thanks! I was thinking about a filter, not anymore. Will put a hose that goes to my chain, to possibly get some extra chain-lubrication. Good idea?

[@napadaanlng69]

Thank YT for recommending this video. I put a mini mushroom filter in the breather hose and drove my motorcycle until I reached 3000km and noticed that the engine oil levels decreased on the sight glass on my crankcase then I proceeded to change my oil. After 600km of riding with the newly changed oil it seems odd that the oil levels decreased again and I noticed that there's an oil leak in my crankcase just below the block. Now this video helped. Thanks.

[@banzobeans]

Waterboarding your bike. 😅 A truly American metaphor!

[@TJBRUTALCUSTOMS]

😂

[@jaspereerdekens3102]

Although you seem like someone who really knows his sh*t, I can't resist not to put a filter on the crankcase breather. The Idea of having an open tube just seems so counterintuitive. I guess I'll just check it regularly to see if it clogs up. (Thanks for the video)

[@ArthVader09]

Why many riders have a plug on the tip of theor breather hose?i saw a video that says you should not plug the hose because it will build so much pressure

[@billadmond9450]

Thanks very much, you explained it very very easily and practical. Then I asked myself why people still install filters especially in very powerful or old fashioned bikes? By the way, my Honda CB300R's manual shows a pipe which goes down the frame which is closed with a tap and they advise to clean it periodically. Funny thing is since this seems to be a very important task to do frequently on a schedule like cleaning the chain and grease it, check oils levels etc. etc. So has anyone here a similar factory fit and did you take off the tap definitely?

[@claytonhurst1329]

Mine is in a very very difficult place to reach im debating on even struggling to put a hose on it since ill have to clean it anyway

[@ClassicRider]

Good point on the filter sir - so I can run a hose instead !

[@ClassicRider]

@@TJBRUTALCUSTOMS Thanks I got it done. I have a Honda Cb750 1979 . With the heatwave, my engine was hitting over 200f if waiting in traffic. I figured the Crankcase hot fumes going directly into the combustion chamber could only make the engine hotter. Still using the airbox, the crank case input was plugged for now and the hoses went then to a filtered vent - that was smoking a little today. When hearing your logic. I froze your vid, and connected a nice segment of tube and directed it to follow the other waste tubes. As long as my wife does not complain about odors - Anyway - Thanks again - I subscribed, and you are featured on my youtube page under motorcycle mechanics - - ( ps - keep making the vids's - thanks - )

[@MRsickcat84]

Hi. Thanks for brief yet concise explanation. Question, is there any risk to contaminate the crankcase by dust and whatnots if it's not filtered?

[@TJBRUTALCUSTOMS]

As long as there's a length of hose on there and you're not shoveling dirt on it, no.

[@MRsickcat84]

@@TJBRUTALCUSTOMS thanks man!!

[@lthutchins9473]

I was paranoid something would crawl up in the hose and plug it so I cut some fine wire mesh (like your velocity stack mesh) and fit it over the end of the hose.

[@Oliver0200]

Cool to see you here Tommy

[@coltonwancho6571]

Believe you me nothing on this Earth want to go up that hose. It's oil soaked, smell bad, and once the bike starts it's loud so yeah. In all my years never had anything go up and breather hoses

[@dansanchezsanchez9732]

I have a VTX 1800c and have a hose all the way below the air filter and at the end a round air filter. What are your thoughts ? Tks

[@aramotoroadtrip526]

So that's why my bike always have some oil leaks. The mechanics never cared about my bike's engine breather. -_- Your video is so helpful. I am now going to bore a hole on the air filter foam because my bike has the intake manifold and the engine breather connected through the stupid stock air box. Because of what you said, I just realized how horrid this stock design is. Thanks! Keep it up.

[@DonWolfe-e2n]

I have a 2007 VStar 650 Classic puking oil out the output shaft the breather hose is fine bike runs great can I replace the output shaft without removing the motor from the frame????

[@jackchapman4420]

Thanks! These videos look great. Keep up the content.

[@colorocko1]

Thank you for the explanation.

[@TJBRUTALCUSTOMS]

welcome!

[@ttxxdd]

Is it normal to have white smoke coming out of breather after hard riding?

[@quadbrothers5801]

No

[@greggorga4171]

I have a little bit of smoke coming out of my breather on my 99 cb750, any ideas what it is?

[@robertcarlson2401]

Thanks for this. Now if you could solve the mystery of the secondary air filter and is it a part of the crankcase breather system I would be happy. I have a vt1100 ace 1998 and although the parts diagrams show it has secondary air filter for the life of me I cannot find it in the location it is supposed to be.

[@chuntolai7177]

hi TJ, thank god that i see your video before i make my cb400sf into a street tracker. I wonder if i remove the breather vapor collector attached to carb will make the gas consumption of bike higher?🤔🤔

[@StanKing-k6c]

What size is the breather hose attached to the valve cover?

[@CM-zi2on]

So I bought vtx 1300 from a guy and he pulled the ais since he changed the pipes. So as you know it pops after. So the 2 top hose attachment spots like your explaining are plugged both the front and rear ones. As you know 1 sucks in and blows out. My question for you is do I remove the rear one and leave the front sucker plugged?

[@MrCoffeeCrisp]

Great video thanks! Can i remove the sub air filter and block it off?

[@johneli1911]

I have a question about the breather air flow on a Twin Cam Harley. Is the air flow from both sides of the breather hole the same or one side seems to be stronger? Great video btw!!

[@huntermfsmith8357]

I had a hose on mine ran down too the ground when I got mine but it kept spitting oil and stuff out all over my rear swing arm and back tire so I installed a vented catch can. Is a vented catch can okay ? I was told by some that it’s fine and others said that I had too have some sort of vacuum pulling the air from that crank case too so I’m lost and worried about messing the bike up

[@TJBRUTALCUSTOMS]

We are so sorry, but we just cannot help diagnose bikes via KZbin! It usually ends up being an exercise in futility and frustration. Plus, you wouldn't want a stranger on the internet diagnosing your bike! One would really need the bike in person to properly diagnose, and we are not a service or repair shop. We recommend you check out our other KZbin videos (there's a TON!) and the support page at shoptjbc.com If you are still not able to figure out the issue, we recommend you take it to a local shop! Wish you the best and do fun shit!

[@mattf2535]

On Honda single and twin parallels, that CCB needs to be drained or cleaned every 4k.

[@hectorbautista602]

Great I understand how they work maybe you could explain what would cause oil to come out of the breather tube like it's being pumped out while the bike is at idle that would be cool subscribed

[@agnidominik4693]

perhaps a little bit late to the party, but have you found out the cause in the meantime? asking because i think i'm currently having an oil leak from the breather on my suzuki intruder 800

[@ryanbbgaming]

@@agnidominik4693 been reading could be overfilled oil capacity this guy has another video specifically on this

[@agnidominik4693]

@@ryanbbgaming it actually was a leaking valve inspection gasket, and it looked like it was leaking from the breather

[@barryjohns1965]

Will this cause oil to become gathered in the exhaust. I have a bike I got from a friend and it smokes and leaking oil on to the ground from the crank case vent hose. Bu it also is getting oil into the exhaust and causes the bike to smike when the pipes get good and hot.

[@TJBRUTALCUSTOMS]

If the breather is clogged it can push oil past tje rings, blowby. Rings are probably not in good shape. Time to rebuild

[@450playyer]

What if there is white smoke coming out of the breather?

[@TJBRUTALCUSTOMS]

gonna have to dig into it! Im sorry buit i cannot diagnose bikes in the comment section! Sorry!

[@wcjcnc]

I thought crankcase breathers were like a one way check valve that only let pressure OUT of the crankcase?

[@chrisorr4087]

I have a Chinese pocket bike 90cc. The stock air box on the carb has an air line that goes to the crankcase , I want to remove the air box and replace it with a cone filter. Should I leave the air line connected to the crankcase fitting?

[@EduardoCamacho-ft7co]

What if there is air pressure coming out from where your fill up with oil while running.

[@bikerbobcat]

I knew it! I'm stripping down an '03 Shadow Spirit 750 DC and that particular hose is super cracked where it met the back of the air box. GONE! What kind of hose should I replace it with and can I get it in RED? I'm replacing all my hoses and wire jackets/looms with red. It's a theme. Cheers! Thank you!

[@nateklein7342]

go to autoparts store and get something rated for oil not coolant.

[@IKS-Exploration]

Thanks 👍

[@TheMrB]

Ive got new trousers, they are lovely. In other news this video was helpful

[@jeffschulz8419]

If the crankcase breather doesn't have a filter will it collect dirt in the engine

[@bikerbobcat]

If the hose is long enough and goes to a protected area, probably not.

[@quadbrothers5801]

@@bikerbobcat mine came off the filter. I’m gonna change my oil and oil filter because I’m worried some water got in.

[@hunterdupont558]

Could crank case possible cause the exhaust header glow red ? You say it could push oil in the the cylinder witch would make it run lean ? Witch could make it run hot possibly?

[@MunsKi]

how does it not have intake motion? only pulse outside?

[@brianscrivener4670]

I am having issues with my 2014 Valkyrie with this vent. There seems to be oil making its way up the tube onto my throttle body and getting into my idle air control sensor. My bike then runs at @ 1200rpm. I have cleaned the vent and I am about to put it back together, but this makes me think that I should reroute the piping to the bottom of the bike. I thought that Honda put it to the airbox for some other reason than to just collect the oil. Thanks for the video.

[@coltonwancho6571]

It's should be in a good running bike such a faint fog of oil that it would just get sucked into the intake air charge and burn off as the bike runs. If this is happening I'd check your oil levels. Oil level can increase crankcase pressure and it will dump excessive oil in to the intake.

[@THECROW1368]

What kind of hose to use for the crankcase breather hose

[@KatanaRIDERS.]

My crank case breather is pushing shit ton of oil out what is wrong?

[@SouthernCali619]

Thank you bro! So I was thinking . Hmm maybe I can put a filter on it... 3 sec later ... “do not put a filter on it” haha 😂

[@stevenpfleuger5639]

So, if this is what’s happening, and oil is spouting or seeping into gaskets and what not, do those need replaced, or should they be fine once the breathing is under control?

[@Baron7919]

I too would like to know an answer to this

[@evanstreets8830]

Is it normal to get a little Smokey mist coming out of the breather with the hose off ?

[@banzobeans]

Perfect title!

[@TJBRUTALCUSTOMS]

Im glad you like it man! Thanks!

[@ExtravagantLive]

why does my breather tube have a plug from factory?

[@jameswilliams8425]

As always I enjoyed the content thank you. Question off subject I’m working on a rebuild for a 93 vt1100 and I’m having trouble finding carb parts. Am I missing something, are the carbs similar to other models. The diaphragm on the right side is torn slightly and the screw to reach the needle to the slight is stripped. The bikes been sitting for some time

[@thecrossroadstavern1447]

Not a full scope answer but I have heard from a local motorcycle professional mechanic that ‘KN’ brand jets and parts are what you want. No off-brand, no second sources, if you can avoid them. KN all the way.

[@MonsieurMotocyclette]

Hi man. Thanks a lot for this video. I ve bought a bike (fz6r) and i found some (small quantity) of oil in the airbox. Do you think its normal

[@EliRangel]

What using a catch can, like the ones used for cars?

[@devil6spawn]

Hi iv been been building bikes for a long time now but if got this one that's got me stumped if done to this bike what if done to many others but don't want none of it it's the wrost engine if ever seen if there is a part that can be change it done it and there has been no difference in what it's doing 60bl piston pressure should be 160 black plug done the bore piston valves springs new valves to I have to turn the fuel mix Screw to half turn or bike don't run go above it cuts off to below cuts off and its been doing the same thing even with the stock parts on it hence why I started playing with it now the oil from the breather leekes out every where even when has stock box on it was full of oil the only thing I have not done is Chang the gears on it it's got to a point I'm going to put a catch can on it as I can not stop the back pressure no matter what I do the clutch slips like anything new clutch and in the arm there is a half inch before even touching the clutch new cable for this bike it has to be done all the way before you can engage the clutch some one going hydraulic clutch but I feel it might not work it's got to a point that I'm going to put something else in it as the money that's gone in to it could of got me a new engine the parts are getting harder to find to as the ppl that make this bike do not supply the parts no more and no matter what I do the timing dose not line up it's always half a tooth out don't get me wrong would be a nice little run around got it for my son to learn on it's a little 125cc not worth some ppls time the bike is made by quadzilla it's a white knuckle Wk125r so if i done all this why do you think no matter what has been done it's still doing the same thing it's been doing since I got it if even talked to quadzilla and they have no idea on what is going on and why it is happening

[@elhuachedesalgueromichuaca5697]

I have a 99 polaris sportsman my throws oil from that hose. Can someone help me. I want to know why is doing that.

[@TJBRUTALCUSTOMS]

im sorry man, i dont know crap about polaris stuff.

[@jamessizemore7103]

How much smoke is too much smoke through the breather? I have my vent tube unhooked to keep my air box clean and I’m noticing a bit of oil smoke coming out at stop lights. Is that normal? My bike is burning oil and I think I’ve narrowed it down to valve stem seals. Would that have an effect on the breather?

[@jamessizemore7103]

@@TJBRUTALCUSTOMSI see, Any ideas on what would cause that? For reference its an 81 Honda CB650, it is burning oil and I think I’ve narrowed it down to the valve stem seals. Would fixing that help with the breather or is that another issue?

[@shubhamupman7260]

Great explanation!!

[@b5a5m5]

Would it be good to place a screen on your breather to prevent various bugs from getting into the engine?

[@TJBRUTALCUSTOMS]

if you are going to maintain it and clean itr frequently then yes.

[@davidgoodin3833]

I want to buy a 750 ACE w 27,000 miles for 1500 bucks. Am I just asking for a big headache or am I OK since it IS a Honda?! I'm a little iffy about the milage. Can anyone give me some input?

[@teddd2009]

Well explained. Thanks!

[@tysonlaplant2333]

I'm leaking from oil pan breather y can u help me

[@ArthVader09]

Why mine spits little oil always on the tip of the breather hose?i dont overfill my engine oil

[@TJBRUTALCUSTOMS]

No idea as I can't diagnose via KZbin, but that's not supposed to happen

[@pepelepew2142]

also from the oil filter my motorcycle is blowing the oil seal out

[@gofarit]

I have a 1300 vtx, I put a spike air intake system on it and it came with a small crankcase filter, the problem now is on long rides I'm getting a excessive amount of oil coming from that filter which I know is not normal. What would be the best way to address this problem? Why would oil be coming from there?

[@kevinhill7742]

Vtx1300 rear cylinder mod ventilation of rear head @ aluminum port location which is a solid aluminum stud about 1 1/4" any tips on how to tap this stud for more ventilation

[@SpankinMyDough]

What would cause a large amount of coolant to steam and leak out of crank breather?

[@SpankinMyDough]

@@TJBRUTALCUSTOMS that’s what I’m worried about. Shits fucked. I got it pulled, heads, gaskets, cylinders and jackets all look fine. Such a small amount of coolant in the oil you can’t even tell it’s there. Some bullshit.

[@TheMeishi]

Anyone knows if the breather is one way or just a hole and air can go both ways?

[@N269]

Just curious...... who in their right mind would deliberately restrict the blow-by?

[@TJBRUTALCUSTOMS]

A LOT OF PEOPLE. hence why i made this video. people put those crankcase breather filters on and then NEVER wash them. so they become full of oil and moisture essentially plugging the breather. if you want to run a little filter on there, thats cool, but you gotta clean it every few months. wash it with som,e simple green till it doesnt rinse dirty, dry and reinstall.

[@N269]

@@TJBRUTALCUSTOMS So, the EU regulations that vehicles should not be user-maintainable are justified. Legislation should reflect the weakest link in the chain... people, us mortals who know about blow-by/breathers and so forth should NEVER be allowed to even test and re-pump out tyres... in fact, perhaps us "mortals" shouldn't even be allowed to ride our vehicles in case we can't check the oils, coolant and other voodoo elements of vehicular maintenance that the dumb people don't know about.... Only the qualified, licensed, certified, regulated are allowed to even touch vehicles.... that's what it's coming down to.... If you block off blow-by then you need to be neutered - so you cant breed dumbness! PS... what a wonderful rant! 👍

[@A46648]

I have a hose going to to ground in my car... but can it suck in dirt in the engine or dust please help

[@A46648]

@@TJBRUTALCUSTOMS ok thanks i was thinking about this and i cut the hose to see if something was in there and there was a little bit sand i dont know if it could suckt it in

[@darkrasta7472]

Sir may i ask? Does z250 have crankcase breather or positive crankcase ventilation?

[@darkrasta7472]

@@TJBRUTALCUSTOMS i trying to look around still hasnt found the answer, my bike kinds hotter than usually

[@bikelife3018]

So is it ok if once in awhile rarely some oil comes out my crankcase breather hose?

[@bikelife3018]

Ty in a way that means its actually doing what it supposed to do and releasing pressure? So in a way it works kind of like a pressure realeave valve. Great video thanks again

[@khanibrahim5947]

can i just vent the hose to atmosphere without a filter or catchcan ? I dont care about EPA and oil spill.

[@larbibilal7350]

Very informative

[@Ophanim_Cherub1.4]

So I did have it set up right. Eff filters lol

[@TJBRUTALCUSTOMS]

[@That_Rotten_Egg]

Funny thing, I understand it’s a vent to atmosphere. How come I removed mine and found a sponge and NOTHING but flat bare metal underneath lol I tossed it in trash bin

[@u563rick6]

James Egnot sponges job is to filter the oil out from being sucked in the air intake

[@pthome3609]

Turn up recording volume!!

[@ibiker85]

super channel

[@TJBRUTALCUSTOMS]

Thank you so much!!!

[@Boldswords11]

TLDR, dont plug the bitch if you like your motor to not grenade itself.

[@Bruce-Wayne717]

If I got paid five bucks for every time you cleared your throat in these videos I could buy out your whole warehouse LMAO. Love the videos TJ keep em coming 👍.

[@sadiel1]

oooh so thats why engiine go boom!

[@WFO.Ian.30]

Ahh so that’s what’s dripping oil on my carb🤔🤔

[@bigmuller1]

All has they do.is make you're leg smell......

emo lemmy