I called off of work tomorrow after watching this to get my hands dirty and get this done! Thank you for the clear, to the point and instructional video sir.
Have been struggling with a fuel issue for three weeks. Thank you for your video. Have removed the emissions pump and now it works a treat. Excellent!!!!!
Those reed valves direct air the opposite way to an EGR valve, they send a little timed puff of clean air into the exhaust only after the exhaust valve closes. Objective effects are hotter exhaust from cleaner burning of carbon monoxide and NOX fumes, and some describe less popping during engine assisted deceleration. Unless they have failed, the reed valves won't let exhaust gasses flow backwards into the engine, they are one way valves pointing the other way. The vacuum is a control line designed to close this pathway off during the high vacuum conditions of idle, air suction flow only happens when vacuum drops as the throttle opens. When operating normally this should not influence power output or torque at all.
@@willsrestorations I left mine alone for 26 years and have had no issue. That said, many guys modify their exhaust for some reason, and I suppose a modified exhaust might behave differently. Or, a bike with a vacuum leak might allow the air suction system to open at idle when vacuum should snap it shut. Rather than fixing a vacuum leak properly, some might remove the air suction system, and notice improvement if the leak was there. In a properly functioning system, there should be no noticeable improvement at all. If those valves stick closed, it would be like not having them at all, though if they stick open from carbon buildup I suppose there could be an issue. It's easy to clean those reed valves at every valve lash adjustment. I don't believe this system affects crankcase pressure, since the rudimentary free flowing "PCV" in this old bike is just a vent tube going to the outside of the air filter, with a dangling tube to drip oil onto the ground from there.
@@spelunkerd So blocking these intakes of clean air through the valve covers does not really affect performce and does not risk damaging the engine either? The effect would mainly be related to the exhaust fumes being less clean? I am making a VN800 bobber and would like a cleaner look by removing ”unneccessary” tubes etc. Would leaving the intakes open to suck unfiltered air be better or worse than blocking them with caps in your opinion? Thanks
@@peterlindfors1066 Many guys block that system off, I don't know what would happen if it were left open. I did a whole playlist on the 1995 VN800, and the one titled "know your motorcycle" is the first of a two part video describing that system in detail.
@@spelunkerd I will have a look at that video. I have actually watched most of your content related to the vn800, its all really good and informative 👍 I might check the valve clearance today and take a closer look at those reed valves and clean them if needed. I read about people who have been running with blocked systems for years without problems. I am yet to read about someone who has actually experienced any problems with this modification. All the warnings come from people without experience of the blocked system themselves. I take that as a good sign 😬
Are you sure that's EGR? It looks like its a PCV system. Usually it will keep the crankcase under a slight vacuum and if removed will promote oil leaks from blowby pressure.
Glad I'm not the only one who noticed. A V-twin engine's crankcase undergoes a lot of pressure changes while the engine is running (high crankcase pressure when both pistons are down, and low pressure when both pistons are up) and the slight negative crankcase pressure actually reduces pumping losses and helps the engine run slightly smoother and more efficiently. Mr. Kawasaki knows a lot more about making an engine run strongly and efficiently than Mr. Cruizerdaze.
@@willsrestorations I'm old school Ran a reducer to a 1/4" fuel line down as a road draft tube like all vehicles had before the EPA. Dribbles a little oil but never builds pressure.
What is the is each of the nipples for on the air filter housing like the 3 behind one one on the bottom? I just bought a 1997 vn800 and need to run new lines as old ones were all removed I am am struggling with it and could really use some help knowing what they are for or where do they connect at the other end thanks 😬
i removed my stock petcock and use manual petcock from raptor 660 and capped the vacuum line on carb on the rear of carb. i get vapor lock ever 10 miles. im about to return to vacuum petcock. the OEM petcock always caused my float needle to hang open and leak fuel. i would clean and clean the carb but cannot still figure it out.
Scott Harvey Good question! There is no other way for the crankcase to vent. Everyone's been running their bikes like this for over 15 years now without issue though.
I have been working on this bike all day and the wife is getting pissed. I pulled apart to do the valves shims. the crankcase breather hose that is the middle hose on the airbox where the hell does that go?? Does it just not go to anything? I cant tell there was a little clip on there but I've looked everywhere. I've scoured the internet and the manual and cannot find. any help would be great. I know where it connects to the airbox I just don't know where it's supposed to connect from there. Anyone that can help would be much appreciated.
Better late than never, but here it is. Removing this valve stops the engine from circulating exhaust back into the combustion chamber. The exhaust gasses reduce engine performance. The bike will pollute more, but hey, bikes get better mileage than most cars anyway.
Just wondering, I pulled the main hose that comes up from the bottom to the valve and plugged it with a electrical cap(had to cut the wings off) perfect fit. Put the hose back on. Runs great and runs cooler also. I also debaffeled the stock exhaust and have had no issues yet, 0 backfiring and picked up some horses. Is there something that I missed here and hurting my bike in the long run ?
foghorn Key 2 years since, did this cause Problems? I'm assuming you just opted to leave every thing in place and capped the air hose from the air intake that feeds this system. That also seemed the easiest way to go to me as well.
Pinda1700 The big caps were 3/8" the small ones were 1/8" I believe. Just get a good assortment like this one and it will have all of them: www.amazon.com/gp/product/B008DZSZK6/? tag=vn800epa-20
As a Master motorcycle mechanic for more thanI'm not saying that that should matter all that much but I will tell you this that is not a good idea, first of all you need to understand what positive crankcase ventilation is, and removing this will only cause long-lasting long-term an understanding that excess blow-by needs to be removed from the motor it also helps the motor breathe properly and this will not make the motor run that is wrong, it will make it run hotter it will also trop access blow-by in the long run this will damaged valves and cause uneven pressure inside the motor. I understand people are trying to help but sometimes it will hurt and if you choose to do this I can guarantee you most of the time you will do serious damage. You could take my advice or his but you've been warned.
This is sound advice! I have learned since making this video that the ports I was calling off were in fact the crankcase vents and not solely an EGR. I was regurgitating information I found in detailed write-ups that was inaccurate.
@@willsrestorations The advice would be to either let them vent to atmosphere (there is an internal check valve and filter in each head) or divert to a catch canister.
@@FiresidePrinting i have removed the baffles and notched a two-inch hole in the exhaust im in the process of removing the epa which jet do you recommend ? also is plugging the valve covers ok?
mikke fergerson I used a Dino jet kit. They call theirs a number 134. I read on one of the forums that their numbering system is different. I’ve thought about this epa mod a bit more. I think it might be a bad idea. The system is not directly connected to the exhaust system. Other commenters on this video say this is a PVC system. I think they are right. Plugging this will trap blow-by gasses. It will accelerate the degradation of your oil. I’m not doing this one. I think my next mod is a tach, so I can see when I’m approaching 8000 rpm. There is a rev limiter at 8200, or so I’ve read.
Maybe for priming... There is a vacuum line that goes from the petcock to a vacuum source that opens the petcock only when the engine is running. Make sure that vacuum line is connected and good.
In the beginning of your video you said you had a link to a write up of this. What is that link? My tank was caved in so i bought a used one and it apparently came from any other sate than CA. So unless I can figure out what to do with the extra hose, I'd like to remove the excess stuff . Suggestion?
Hey man, I have a quick question. I have a VN400 '98. I have given up on my mechanic after him ripping me off, so I want to learn take care of my bike. I did a mistake when I am taking apart some parts so I would like to learn stuff. At the air filter box, I have the same hole shut off. But there are other two hose connectors. One is underneath (the small one) and the other is medium, has a short hose on it. Could you tell me what are those for and what / where shall I connect them? Thank you very much.
I'm not near my bike right now. 2 states away actually. The hoses only fit on the air box in one way though. The small one fits on one inlet, the larger one on another. If you Google vn800 service manual, it will show where the other ends go, if that's what you're asking.
this is not EGR and it is not connected to the crankcase. This valve allow fresh air from air filter to be sucked to exhaust pipes directly to burn unburned fuel. You want only remove this when you tune your carb with AFR sensor because extra air in exhaust make problems. The crankcase has vent near bottom of second cylinder. This is not performance mod but it helps tune carb and makes exhaust pipes a little cooler
It won't this is the worst thing you could do to this bike. It's like choking off all the blow by and will only destroy the motor. It's a ridiculous video that you never be performed by anyone.
Hey I want to do this mod on my Vulcan 800. It has straight V&H pipes, carb already tuned up for those pipes as well. It's going to affect anything if I do this? I know there's a crankcase breather on the back cylinder, but how's it's resulting for you so far?
That's the positive crankcase ventilation system. It won't cause half the problems you claim. Also, don't just block or connect the two crankcase vents with fuel hose unless you want increased oil consumption and oil leaks springing up sooner than they otherwise would. Put a breather on it instead.
@@jesses480 If you put the tube between the 2 heads, just take that tube off. Leave those 2 ports open to the air. They have one way valves and a filter behind them so it's all good.
I did exactly as you showed… but now when ik start te bike. It runs great, but when i put it in first and want to drive it shuts down the engine? Please anyone? 🤣
This is not egr or pcv this is PAIR valve that takes fresh filtered air from air box and gives it to exhaust for un burnt fuel. It doesn’t increase/decrease performance but it helps environment by not letting carbon monoxide gas out
If PAIR valve is off as shown on the video I think none of this bikes will successfully get passed legal inspection done at every single country where you guys live for sure.
Ya dude... I pulled it off about an hour ago. I already had V&H pipes which sounded good but man, now it just sounds clean. Nice and throaty. After taking it off I noticed right away that I had been running my idle way too high. Great video. I watched this last year when I wanted to do it but was hesitant. Today I said, “fuck it”, and I’m happy I did. Thanks again.
@@criticalthinkerguy worked great. Ended up selling the bike and getting a VN2000. Did the same thing to my new bike. Seems to be common practice with most bikes.
again folks, this is NOT an EGR. this is a fresh air intake valve providing fresh air into the exhaust manifold via the rocker covers. the fresh air comes in thru the vacume valve from the air intake filter housing. the fresh air mixes into the exhaust manifold as the exhaust comes out of the head creating a leaner and cleaner exhaust at the end of the pipes. the crankcase vent is low on the #2 cyl. capping the rocker coverhose ports will help the motor run better, and cooler and will balance out the fuel mixture if u were to remove the exhaust pipe baffels or install aftermarket pipes.
the valve covers need to vent...blocking them off will cause blow by and hurt the motor more in the long run.....this is all part of the crank case vent system
@@edeco50 crankcase in Vulcan is also connected to airbox. Cylinder heads and Valve covers take fresh air from airbox and it goes to exhaust pipes. There are one way valves that stops exhaust gases from going to airbox. Vulcan has no egr like system. Sorry for my english.
Doesn’t make sense. If it’s attached to air intake, how is it recirculating exhaust? It is there for efficiency. The only real benefit in removing it seems to be aesthetics.
Can you help me with the 800 vulcan classic I have a front end wobble ? Seems to be worse from 30-45 mph? Thanks for your help, the videos are great very helpful
I know this is 8 years later but you should always check the bearings in the front wheel and check the tire for run out as it may be a old tire or the rim is no longer straight or your triple tree bearings on no longer any good. Always jack the bike up with the front of the bike off the ground and the rear tire on the ground and check all your tolerances and check for anything that is loose
Upsss!!!, A PCV Valve, !!! Upsss, efectivamente esa es una válvula PCV, y tiene como finalidad que los gases que se generan dentro de la cabeza y motor de la moto sean desechachos hacia su exterior mediante estás resperideros, que más que respiraderos son expulsadores de gases, pues al ir conectado al filtro y toma de aire de carburador funciona subsionando los gases daniños hacia la cámara de combustión y así sean reciclados. O sea a efecto de que esos gases sean quemados !!!. Esa es la única función de esa válvula, y si obstruyen los orificios expulsores de gases de aceite lo que ocacionaras es mayor presión en su interior y por consecuencia que las juntas de esa cabeza se dañen y empiece a expulsar el aceite mediate ellos. Ok. Bay
You do realize that by doing this you're allowing the blow by to stay trapped in the cylinders, sorry man but as a motorcycle mechanic and a shop owner I would definitely advise against this.
@@willsrestorations naw my boy i got a HD for sure….if i could post a pic I would. My son has a 97 Vulcan which was why we were looking at this. I believe there to be very minimal, if any, drawbacks to doing this.
@@keithk7451 that's because you're not mechanically inclined or just making foolish statements or uneducated statements. You don't see any real disadvantages to doing this because you don't know any better. But you go ahead and do this to your son's bike and you'll find out first hand. There's always some goofball on UA-cam showing you how to do something that will destroy your vehicle or motorcycle and this is a clear example of one. This will also cause the reeds in the valve covers to become sooted up with a lot of carbon and cause them to no longer work which is a serious issue. But hey you continue believing what you want even if it is defective thinking. It's nice to know you have a Harley-Davidson where every single part was manufactured in China.
@@keithk7451 did you just brag about having a Harley-Davidson Chinese piece of junk. Every bolt rots out after 3 years. Nothing but a hunk a junk. I love how people claim that it's made in America when absolutely not one component of a Harley-Davidson was ever manufactured in the United States and all the parts come from China. Obviously you're not a mechanic so you saying that there's minimal drawbacks doesn't really hold any water because there are serious drawbacks to doing something like this as now the reeds Will not be able to operate properly and you will cause major problems with the motor by doing this ridiculous modification which does nothing but damage and has no upside.
You removed PCV system, which keeps your inside engine cleaner and prevents oil leaks from increased crankcase pressure!!! You can do any dumb sh.t to your bike, but DO NOT recommend it to other people!!!! I guess you don't know what PCV system is and how it works. Research internet!!!
DON’T do this to your bike! Dude has no clue what he is talking about! He messing with the PCV which is positive crankcase ventilation. It lets piston/cylinder blow by get re-introduced into the air intake tract for emissions. Sense when does exhaust gas come out of the cylinder head valve cover!? It doesn’t, Vulcans of these years don’t have an EGR system. If you look at your exhaust pipes do you see anything pulling exhaust from them for recirculation? Nope, sure don’t! Doing anything he’s doing is not going to help your performance, it’s all in your head, placebo.
As a master of motorcycle mechanic and a shop owner I advise strongly against doing a hack like this as you can cause some serious problems with your bike. Blow by is an essential part of elimination gases out of the heads. If you listen to guys on UA-cam they will destroy everything you own.
@@criticalthinkerguy first you have to understand that there are reeds under the valve covers that will not work properly when leaving these open to the atmosphere and can only draw a tremendous amount of contaminants into the top half of the motor causing catastrophic failure. I don't understand why people want to modify something that's not modifiable.
Be very weary of all these weekend mechanics giving "fix" advice on here. Engineers designed these motors and the parts on there were put there for a reason. Unless you're an engineer knowledgeable on these engines, don't go "modifying" your bike without knowing how you will be affecting the engine's longevity.
I called off of work tomorrow after watching this to get my hands dirty and get this done! Thank you for the clear, to the point and instructional video sir.
Ty Greason Glad to help where I can :)
Have been struggling with a fuel issue for three weeks. Thank you for your video. Have removed the emissions pump and now it works a treat. Excellent!!!!!
Awesome! Glad I could help!
CruiserDayz ua-cam.com/video/YgplVW6WTNk/v-deo.html
@@CruiserDayz can you please share us what is name of hose caps you showed us ok this video?
Just did this and boy can I tell the difference. cooler engine, louder exhaust (stock pipes w./ baffles and all) and overall a happier bike
Those reed valves direct air the opposite way to an EGR valve, they send a little timed puff of clean air into the exhaust only after the exhaust valve closes. Objective effects are hotter exhaust from cleaner burning of carbon monoxide and NOX fumes, and some describe less popping during engine assisted deceleration. Unless they have failed, the reed valves won't let exhaust gasses flow backwards into the engine, they are one way valves pointing the other way. The vacuum is a control line designed to close this pathway off during the high vacuum conditions of idle, air suction flow only happens when vacuum drops as the throttle opens. When operating normally this should not influence power output or torque at all.
Hey buddy, how you been. Are you saying that this is not advisable because that's what I'm saying, I think this is a very bad idea, please advise
@@willsrestorations I left mine alone for 26 years and have had no issue. That said, many guys modify their exhaust for some reason, and I suppose a modified exhaust might behave differently. Or, a bike with a vacuum leak might allow the air suction system to open at idle when vacuum should snap it shut. Rather than fixing a vacuum leak properly, some might remove the air suction system, and notice improvement if the leak was there. In a properly functioning system, there should be no noticeable improvement at all. If those valves stick closed, it would be like not having them at all, though if they stick open from carbon buildup I suppose there could be an issue. It's easy to clean those reed valves at every valve lash adjustment. I don't believe this system affects crankcase pressure, since the rudimentary free flowing "PCV" in this old bike is just a vent tube going to the outside of the air filter, with a dangling tube to drip oil onto the ground from there.
@@spelunkerd So blocking these intakes of clean air through the valve covers does not really affect performce and does not risk damaging the engine either? The effect would mainly be related to the exhaust fumes being less clean? I am making a VN800 bobber and would like a cleaner look by removing ”unneccessary” tubes etc. Would leaving the intakes open to suck unfiltered air be better or worse than blocking them with caps in your opinion? Thanks
@@peterlindfors1066 Many guys block that system off, I don't know what would happen if it were left open. I did a whole playlist on the 1995 VN800, and the one titled "know your motorcycle" is the first of a two part video describing that system in detail.
@@spelunkerd I will have a look at that video. I have actually watched most of your content related to the vn800, its all really good and informative 👍 I might check the valve clearance today and take a closer look at those reed valves and clean them if needed. I read about people who have been running with blocked systems for years without problems. I am yet to read about someone who has actually experienced any problems with this modification. All the warnings come from people without experience of the blocked system themselves. I take that as a good sign 😬
What is the small hose from the rear?? Does this cause condensation in the heads?
haha "if it wont slide on spit on it":) made my day. Great channel! thanks for the video!
Yup, that’s what she said…..😂😂
Are you sure that's EGR? It looks like its a PCV system. Usually it will keep the crankcase under a slight vacuum and if removed will promote oil leaks from blowby pressure.
Glad I'm not the only one who noticed. A V-twin engine's crankcase undergoes a lot of pressure changes while the engine is running (high crankcase pressure when both pistons are down, and low pressure when both pistons are up) and the slight negative crankcase pressure actually reduces pumping losses and helps the engine run slightly smoother and more efficiently.
Mr. Kawasaki knows a lot more about making an engine run strongly and efficiently than Mr. Cruizerdaze.
@@hossesarse yeah I don't know where this guy gets his information from but this is a terrible idea and it should never be performed on any bike
It injects fresh air directly in the exhaust system. Has nothing to do with egr or pcv.
@@willsrestorations I'm old school Ran a reducer to a 1/4" fuel line down as a road draft tube like all vehicles had before the EPA. Dribbles a little oil but never builds pressure.
What is the is each of the nipples for on the air filter housing like the 3 behind one one on the bottom? I just bought a 1997 vn800 and need to run new lines as old ones were all removed I am am struggling with it and could really use some help knowing what they are for or where do they connect at the other end thanks 😬
i removed my stock petcock and use manual petcock from raptor 660 and capped the vacuum line on carb on the rear of carb. i get vapor lock ever 10 miles. im about to return to vacuum petcock. the OEM petcock always caused my float needle to hang open and leak fuel. i would clean and clean the carb but cannot still figure it out.
I know this was a long time ago but any suggestions having the same issue
Does the engine have a another breather somewhere else to allow the crankcase to vent once you have blocked the to ports
Scott Harvey Good question! There is no other way for the crankcase to vent. Everyone's been running their bikes like this for over 15 years now without issue though.
Thanks for the video. Why did you leave all that tubing from the carb? You could remove it all and plug the carb for a cleaner look.
Thanks I did remove it later.
is the vn800 a non-interference motor
Seeing inside your ear was the highlight of the video for me
I have been working on this bike all day and the wife is getting pissed. I pulled apart to do the valves shims. the crankcase breather hose that is the middle hose on the airbox where the hell does that go?? Does it just not go to anything? I cant tell there was a little clip on there but I've looked everywhere. I've scoured the internet and the manual and cannot find. any help would be great. I know where it connects to the airbox I just don't know where it's supposed to connect from there. Anyone that can help would be much appreciated.
hi, my english to listering is bad,, could you explain-me What does it do to make this change?
Thx
Gonzalo
Better late than never, but here it is. Removing this valve stops the engine from circulating exhaust back into the combustion chamber. The exhaust gasses reduce engine performance. The bike will pollute more, but hey, bikes get better mileage than most cars anyway.
Just wondering, I pulled the main hose that comes up from the bottom to the valve and plugged it with a electrical cap(had to cut the wings off) perfect fit. Put the hose back on. Runs great and runs cooler also. I also debaffeled the stock exhaust and have had no issues yet, 0 backfiring and picked up some horses. Is there something that I missed here and hurting my bike in the long run ?
foghorn Key 2 years since, did this cause Problems? I'm assuming you just opted to leave every thing in place and capped the air hose from the air intake that feeds this system. That also seemed the easiest way to go to me as well.
Great video!
Can you tell me what size vacuum caps you have used?
Thanks!
Pinda1700 The big caps were 3/8" the small ones were 1/8" I believe. Just get a good assortment like this one and it will have all of them:
www.amazon.com/gp/product/B008DZSZK6/? tag=vn800epa-20
CruiserDayz
Thanks! I will order the caps from Amazon. :)
As a Master motorcycle mechanic for more thanI'm not saying that that should matter all that much but I will tell you this that is not a good idea, first of all you need to understand what positive crankcase ventilation is, and removing this will only cause long-lasting long-term an understanding that excess blow-by needs to be removed from the motor it also helps the motor breathe properly and this will not make the motor run that is wrong, it will make it run hotter it will also trop access blow-by in the long run this will damaged valves and cause uneven pressure inside the motor. I understand people are trying to help but sometimes it will hurt and if you choose to do this I can guarantee you most of the time you will do serious damage. You could take my advice or his but you've been warned.
This is sound advice!
I have learned since making this video that the ports I was calling off were in fact the crankcase vents and not solely an EGR. I was regurgitating information I found in detailed write-ups that was inaccurate.
@@CruiserDayz so is your advice now not to go forward with this removal???
@@willsrestorations The advice would be to either let them vent to atmosphere (there is an internal check valve and filter in each head) or divert to a catch canister.
@@CruiserDayz yes they are called Reeds. Sometimes my spelling sucks.
@@CruiserDayz so you're saying just leave those 2 big crank case inlet ports open with no plugs and that should be safe?
Can I put little pod filters on the cyclinder to help keep them cool?
+mrjaytion Not sure how much cooling will be achieved by allowing air to come in the EGR system
hey, wanted to ask, is it nessary to re-jet or modify the carburetor in any way when removing the epa stuff?
thanks tim
It is not. It’s only necessary to do after you remove exhaust baffles, swap for straight pipes or modify the air intake for more air.
@@FiresidePrinting i have removed the baffles and notched a two-inch hole in the exhaust im in the process of removing the epa which jet do you recommend ? also is plugging the valve covers ok?
@@FiresidePrinting ?/
mikke fergerson I used a Dino jet kit. They call theirs a number 134. I read on one of the forums that their numbering system is different. I’ve thought about this epa mod a bit more. I think it might be a bad idea. The system is not directly connected to the exhaust system. Other commenters on this video say this is a PVC system. I think they are right. Plugging this will trap blow-by gasses. It will accelerate the degradation of your oil. I’m not doing this one. I think my next mod is a tach, so I can see when I’m approaching 8000 rpm. There is a rev limiter at 8200, or so I’ve read.
@@FiresidePrinting what if I Rerouted The vacuum tubes from the valve cover back to the air filter
If I remove my bypass the vacum line to the carb is open ? Should I line direct from tank to carb ? The vacuum line goes through the bypass. ?
yes
Thanks for the video. I did this to my 2004 vn800 yesterday. But it will only stay running if the fuel petcock is set to prime. Is this normal?
Maybe for priming...
There is a vacuum line that goes from the petcock to a vacuum source that opens the petcock only when the engine is running. Make sure that vacuum line is connected and good.
In the beginning of your video you said you had a link to a write up of this. What is that link? My tank was caved in so i bought a used one and it apparently came from any other sate than CA. So unless I can figure out what to do with the extra hose, I'd like to remove the excess stuff . Suggestion?
that hose probably goes back to the box on the right side behind the covers. Disconnect it at the box and put a cap on the port.
Hey man, I have a quick question. I have a VN400 '98. I have given up on my mechanic after him ripping me off, so I want to learn take care of my bike. I did a mistake when I am taking apart some parts so I would like to learn stuff. At the air filter box, I have the same hole shut off. But there are other two hose connectors. One is underneath (the small one) and the other is medium, has a short hose on it. Could you tell me what are those for and what / where shall I connect them?
Thank you very much.
I'm not near my bike right now. 2 states away actually. The hoses only fit on the air box in one way though. The small one fits on one inlet, the larger one on another.
If you Google vn800 service manual, it will show where the other ends go, if that's what you're asking.
this is not EGR and it is not connected to the crankcase. This valve allow fresh air from air filter to be sucked to exhaust pipes directly to burn unburned fuel. You want only remove this when you tune your carb with AFR sensor because extra air in exhaust make problems. The crankcase has vent near bottom of second cylinder. This is not performance mod but it helps tune carb and makes exhaust pipes a little cooler
Where do all the vent hoses go I cannot figure out what a hose is with a little bottle and it has oil in it goes
Bubba Mack That's your crank-case breather hose. You need that.
wheree would that be located
Dose this effect fuel mileage
going to try this hopefully it makes my bike run better
It won't this is the worst thing you could do to this bike. It's like choking off all the blow by and will only destroy the motor. It's a ridiculous video that you never be performed by anyone.
@CruiserDayz after doing this is your bike running fine? Wanted to know, thinking about doing this.
Yep. Still running strong.
Very helpful thank you
You're welcome!
Hey I want to do this mod on my Vulcan 800. It has straight V&H pipes, carb already tuned up for those pipes as well. It's going to affect anything if I do this? I know there's a crankcase breather on the back cylinder, but how's it's resulting for you so far?
Best thing to do is just remove the hoses and vent the breathers straight to atmosphere.
Looked at my English version 1997 model and don't have one of these??? Is that right.?
David Hooper Could have a version without EGR system.
That's the positive crankcase ventilation system. It won't cause half the problems you claim. Also, don't just block or connect the two crankcase vents with fuel hose unless you want increased oil consumption and oil leaks springing up sooner than they otherwise would. Put a breather on it instead.
Breather? Does that mean one of those tiny crankcase filters?
Just did this then was reading comments is it allgood to do will my bike be sweet?
Best thing to do is just let them vent to atmosphere.
@@CruiserDayz so doing what ur done in video is allgood I don’t wanna pull apart to put back to stock lol
@@jesses480 If you put the tube between the 2 heads, just take that tube off. Leave those 2 ports open to the air. They have one way valves and a filter behind them so it's all good.
@@CruiserDayz sweet I left the stock pipe on and just blocked it off so I lll just remove the hole tube then thanks
I did exactly as you showed… but now when ik start te bike.
It runs great, but when i put it in first and want to drive it shuts down the engine?
Please anyone? 🤣
Take the plugs off the top of the engine. These should actually be left open so the heads can breath
This is not egr or pcv this is PAIR valve that takes fresh filtered air from air box and gives it to exhaust for un burnt fuel. It doesn’t increase/decrease performance but it helps environment by not letting carbon monoxide gas out
If PAIR valve is off as shown on the video I think none of this bikes will successfully get passed legal inspection done at every single country where you guys live for sure.
That's not an EGR system.
I’m going to do this right now, I just need to know one thing. Do you regret it? What did you notice when riding after having done the procedure?
Still runs great
Ya dude... I pulled it off about an hour ago. I already had V&H pipes which sounded good but man, now it just sounds clean. Nice and throaty. After taking it off I noticed right away that I had been running my idle way too high. Great video. I watched this last year when I wanted to do it but was hesitant. Today I said, “fuck it”, and I’m happy I did. Thanks again.
@@mitchelltaylor8282 how did it work out in the long run for you ?
@@criticalthinkerguy worked great. Ended up selling the bike and getting a VN2000. Did the same thing to my new bike. Seems to be common practice with most bikes.
Thanks!!!
again folks, this is NOT an EGR.
this is a fresh air intake valve providing fresh air into the exhaust manifold via the rocker covers. the fresh air comes in thru the vacume valve from the air intake filter housing.
the fresh air mixes into the exhaust manifold as the exhaust comes out of the head creating a leaner and cleaner exhaust at the end of the pipes.
the crankcase vent is low on the #2 cyl.
capping the rocker coverhose ports will help the motor run better, and cooler and will balance out the fuel mixture if u were to remove the exhaust pipe baffels or install aftermarket pipes.
Chris Niehaus
Everything Motorcycles.com
now hiring, MC Technicians
the valve covers need to vent...blocking them off will cause blow by and hurt the motor more in the long run.....this is all part of the crank case vent system
BULLSHIT, Harleys aren't vented!
@@DawnNLN-ee2kh This is not a Harley... so your comment is bullshit
Harley are vented into the air clener
@@edeco50 crankcase in Vulcan is also connected to airbox. Cylinder heads and Valve covers take fresh air from airbox and it goes to exhaust pipes. There are one way valves that stops exhaust gases from going to airbox. Vulcan has no egr like system.
Sorry for my english.
@@marcinsudi agree with you
Is it nessary to re-jet or modify the carburetor afetr this operation? And if it is, can you give us some sugestion...
thanks
rejecting is not necessary. you are basically just keeping some of the exhaust gasses from going back into the engine to be reburned.
tnx on quick answer...i`we debaffled my exhaust, so i hope to some litlle power next seasson..
Doesn’t make sense. If it’s attached to air intake, how is it recirculating exhaust? It is there for efficiency. The only real benefit in removing it seems to be aesthetics.
Can you help me with the 800 vulcan classic I have a front end wobble ? Seems to be worse from 30-45 mph?
Thanks for your help, the videos are great very helpful
I know this is 8 years later but you should always check the bearings in the front wheel and check the tire for run out as it may be a old tire or the rim is no longer straight or your triple tree bearings on no longer any good. Always jack the bike up with the front of the bike off the ground and the rear tire on the ground and check all your tolerances and check for anything that is loose
Thanks, just what I needed to know! :o)
Upsss!!!, A PCV Valve, !!! Upsss, efectivamente esa es una válvula PCV, y tiene como finalidad que los gases que se generan dentro de la cabeza y motor de la moto sean desechachos hacia su exterior mediante estás resperideros, que más que respiraderos son expulsadores de gases, pues al ir conectado al filtro y toma de aire de carburador funciona subsionando los gases daniños hacia la cámara de combustión y así sean reciclados. O sea a efecto de que esos gases sean quemados !!!.
Esa es la única función de esa válvula, y si obstruyen los orificios expulsores de gases de aceite lo que ocacionaras es mayor presión en su interior y por consecuencia que las juntas de esa cabeza se dañen y empiece a expulsar el aceite mediate ellos. Ok.
Bay
Thanks.
porqué enojan las bujias
You do realize that by doing this you're allowing the blow by to stay trapped in the cylinders, sorry man but as a motorcycle mechanic and a shop owner I would definitely advise against this.
Allowing it to say trapped? Damn my bike won’t say anything 😂🤣
@@keithk7451 that's cuz you probably drive a electric bicycle
@@willsrestorations naw my boy i got a HD for sure….if i could post a pic I would. My son has a 97 Vulcan which was why we were looking at this. I believe there to be very minimal, if any, drawbacks to doing this.
@@keithk7451 that's because you're not mechanically inclined or just making foolish statements or uneducated statements. You don't see any real disadvantages to doing this because you don't know any better. But you go ahead and do this to your son's bike and you'll find out first hand. There's always some goofball on UA-cam showing you how to do something that will destroy your vehicle or motorcycle and this is a clear example of one. This will also cause the reeds in the valve covers to become sooted up with a lot of carbon and cause them to no longer work which is a serious issue. But hey you continue believing what you want even if it is defective thinking. It's nice to know you have a Harley-Davidson where every single part was manufactured in China.
@@keithk7451 did you just brag about having a Harley-Davidson Chinese piece of junk. Every bolt rots out after 3 years. Nothing but a hunk a junk. I love how people claim that it's made in America when absolutely not one component of a Harley-Davidson was ever manufactured in the United States and all the parts come from China. Obviously you're not a mechanic so you saying that there's minimal drawbacks doesn't really hold any water because there are serious drawbacks to doing something like this as now the reeds Will not be able to operate properly and you will cause major problems with the motor by doing this ridiculous modification which does nothing but damage and has no upside.
You removed PCV system, which keeps your inside engine cleaner and prevents oil leaks from increased crankcase pressure!!! You can do any dumb sh.t to your bike, but DO NOT recommend it to other people!!!! I guess you don't know what PCV system is and how it works. Research internet!!!
Lol don’t do this!
Why not?
Not a friendly advise....
DON’T do this to your bike! Dude has no clue what he is talking about! He messing with the PCV which is positive crankcase ventilation. It lets piston/cylinder blow by get re-introduced into the air intake tract for emissions. Sense when does exhaust gas come out of the cylinder head valve cover!? It doesn’t, Vulcans of these years don’t have an EGR system. If you look at your exhaust pipes do you see anything pulling exhaust from them for recirculation? Nope, sure don’t! Doing anything he’s doing is not going to help your performance, it’s all in your head, placebo.
As a master of motorcycle mechanic and a shop owner I advise strongly against doing a hack like this as you can cause some serious problems with your bike. Blow by is an essential part of elimination gases out of the heads. If you listen to guys on UA-cam they will destroy everything you own.
@@willsrestorations does leaving them open to the atmosphere make any difference?
@@criticalthinkerguy first you have to understand that there are reeds under the valve covers that will not work properly when leaving these open to the atmosphere and can only draw a tremendous amount of contaminants into the top half of the motor causing catastrophic failure. I don't understand why people want to modify something that's not modifiable.
Be very weary of all these weekend mechanics giving "fix" advice on here. Engineers designed these motors and the parts on there were put there for a reason. Unless you're an engineer knowledgeable on these engines, don't go "modifying" your bike without knowing how you will be affecting the engine's longevity.
Anyone have a good feel line diagram for the 96 1500 drifter ?
Fuel
this is crime,buddy