Yamaha Air Injection System AIS Removal or Disable XVS 650

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The Yamaha Air Injection System AIS found on the XVS 650 Dragstar, V Star and similar bikes is an emissions control system designed to burn unburnt fuel in the exhaust. This can and does result in popping and backing in the exhaust especially on overrun. The system also does nothing for how good the bike looks as it's an intrusive after thought bolted onto the engine.
If you want to disable the system or remove it I run through the process step by step on my bike.
The pipes from the heads have a 12mm OD
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18 фев 2021

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Комментарии : 165

@johnh2055 3 года назад

Having researched this topic a lot the last few days, this video is by far the best one covering this modification. Thank you.

@MotoMirius 3 года назад

Glad it was helpful! Skäl David

@chrishookins9780 3 года назад

I have to agree.

@springy-2112 3 года назад

Well ,we must have fallen out of the same aesthetic perfection tree David ! Changing the redundant engine mount for another right hand one was the icing on the cake 👍🏻☮❤peace and love brother 😊😊

@MotoMirius 3 года назад

I'm not sure I achieve your standards Springy! Hope you continue to improve!

@springy-2112 3 года назад

@@MotoMirius Hey your work looks great to me brother ! I'm slowly slowly improving.. Got a few more tests coming up after having my normal meds changed to make sure all is working ..(blood pressure , kidneys etc ) Peace and love brother 👍🏻☮❤

@jarlesol3865 Год назад

Thank you for a very good step by step showing on how to remove te AIS. Personaly I like the popping sound in the exhaust, but now I know how to remove it if I change my mind :D

@MotoMirius Год назад

To be fair mine still does it at times, just maybe a bit less. I mainly did it because the system is ugly!

@yankeedoodle880 3 года назад

nicely explained David, well done.

@MotoMirius 3 года назад

Cheers Chris, thanks and much appreciated. Hope you are keeping well

@BadPossumFPV 10 месяцев назад

Hi there, Steve again. I have researched endlessly to find a 12mm compression cap listing, but have struck out. Any suggestions on where to find such an enigma?

@revelationakagoldeneagle8045 2 года назад

Thanks 👍 😎 Great Tutorial... Doing the same with my V Star Silverado ✨✨✨ Looks awesome without all the pipes and the unit itself! Update: Removed the AIS System from my bike today, took me only 15 minutes. Looks much better!

@MotoMirius 2 года назад

Thanks, good luck with that. I much prefer the cleaner look.

@ryzae6202 9 месяцев назад

The video lives on. Thanks for this. I just picked up a dirty race tuned v650 and it backfired like mad and i wondered if it was because of secondary or direct air injection. I deleted the SAIS on my triumph scrambler 900 to great success and effect and when i saw the rusting tubes on the Yamaha i wondered if there were, and they are. And they are no more.

@MotoMirius 8 месяцев назад

Great job! Ha!

@mikesautomaintenance5780 Год назад

Good video I just ended up taking everything and left the chrome tubes on the heads and plugged then behind the air filter housing but putting bolts and clamps on the rubber ends where both chrome tubes run to the other side

@MotoMirius Год назад

Thanks. That's a good solution - depends how much you want to strip off

@BadPossumFPV 10 месяцев назад

Thanks for the great video partner! 🙏 I've watched several times... what is the size of the compression fitting for sealing the head ports? 🤔 Steve from Rogersville Tennessee 💪 Thank you again 😉

@camrenmarshall1829 12 дней назад

@badpossumFPV do you still have this bike?? I’m right across the hill would like to meet up & check yours out before I attempt on mine- thanks !

@BadPossumFPV 12 дней назад

@@camrenmarshall1829 I haven't done anything with the AIS yet. Someday ..... 🤔 Love my V Star 650 though ❤️

@houseofbadgers9380 3 года назад

Love your work/video.. 😁 Just wanna ride my bike now..

@MotoMirius 3 года назад

Thanks. Oh me too!!!!

@DZuehlsdorff 2 года назад

Is ther any presure/vacuum from these fittings after you remove everything ? Thanks P.s. Followed your vid, simple process thanks to you ! Thank you

@MotoMirius 2 года назад

Thank you. It's important to cap them off for good running of the bike, especially the vacuum line as described in the video.

@chrisboozer2744 2 года назад

What exhaust pipes do you have and have the baffles been removed? They sound really good. Thanks

@MotoMirius 2 года назад

I have some unbranded drag pipes. They still run baffles but you can modify baffles to produce more or less noise.

@Saratogann 3 месяца назад

Great stuff

@iskrevmas6655 Год назад

Дружище, спасибо за такое подробное видео. Однозначно лайк!!!

@MotoMirius Год назад

Спасибо, рад, что пригодилось!

@arrgylerawrgyle3784 2 месяца назад

So i just recently bought a 650 bobber build bike. Absolutely loving it with one minor problem. I am getting a bit of vibration that is more than normal. Seems to just be in certain ranges. I was thinking there might be two culprits between needing a carb sync or the removed AIS system. With aftermarket exhaust prompting the removal and the carbs being cleaned before buying. Wondering if there might be any suggestions out there? Understood that the AIS shouldn't be affecting it at all, but still wondering if its running richer than needs be..

@MotoMirius 2 месяца назад

AIS is a post ignition system so it's not a likely culprit - but check the pulse port on the inlet manifold to make sure that it is properly blocked and you don't have an intake air leak. Worth double checking the exhaust AIS port too to make sure it is sealed properly too so it isn't impacting on the exhaust scavenging.

@everythingsportscardbreaks2647 2 года назад

where you used the fitting on the back on the copper elbow question, mine is leaking oil out of there around it ? does that sound normal ? so I wouldn't be able to use the shark bite I would have to physically take the rear elbow out , also the little aluminum box to the right with 2 screws on the valve cover have a slight leak there is that a gasket under it or would gasket flex seal work?

@MotoMirius 2 года назад

Oil isn't normal - the AIS is connected to the exhaust so not connected to anywhere that gets oil. I would assume it's leaking from somewhere else and coming out there. Perhaps part of the other oil leak? You can see the gaskets here - www.fowlersparts.co.uk/parts/6367942/xvs650a-dragstar-classic-4c57-2006-060-a/cylinder-head

@greggo7978 2 года назад

Will this increase power or decrease,or will it remain the same.? If any,what effects does removing the AIS have on how the bike performs and the fuel milage numbers?

@MotoMirius 2 года назад

As I mentioned in the video, this will have no effect on power, performance or mileage - the AIS just ensures that any unburnt fuel that reaches the exhaust is burnt before it leaves the exhaust - it is an emissions control device that has no other effect.

@straykiwi 3 года назад

I was wondering if you are planning on doing this to the Duke 390. Does it affect the normal running of the bike (for better or worse), or would it start throwing up error codes. Thanks

@MotoMirius 3 года назад

KTM don't use this system, so no, I won't be doing this on the Duke. This is mostly an old technology device which predates the common use of O2 sensors in the header (which would be affected by the injection of oxygenated air).

@straykiwi 3 года назад

@@MotoMirius cool answer, thanks for taking your time to reply. Keep up the good work making fantastic videos

@mikec.1745 Год назад

Thanks for sharing this with us!!! Really helpfull. Can you please tell me what's the part called at 7:50 (4 mm)? I can't find it anywhere... Many thanks in advance.

@MotoMirius Год назад

It's a plastic end cap, I'm not sure there is a technical name for it. I bought online because there is no chance at all of finding that sort of thing locally.

@earicpatten Год назад

Solid tutorial 🙌🏻

@MotoMirius Год назад

Thanks, much appreciated

@redfear666 2 года назад

Ahora se porque mi 650 tiene explosiones en el sistema de escapes, gracias por la info!

@MotoMirius 2 года назад

¡De nada!

@carandme1 Год назад

I have a 2008 Yamaha Vstar 1100 Classic. I am experiencing the popping/backfiring as well. Does this procedure work on this engine? The 650 and 1100 do look similar.

@MotoMirius Год назад

I believe so yes - the routing of the pipes etc is different but the principles are much the same.

@chrisstagg1635 2 года назад

What size was the plumbing fitting that you used?

@MotoMirius 2 года назад

Its in the video description - 12mm OD

@wernerlampe8089 21 день назад

Hi David, ... very well explained! I have also done this on 3 of the 1100 Dragstars and on my wife's 535 „Viagra“ 😉. … Here in Germany you can buy special caps to close the motor (Thunderbike Motors). … Thanks again for this good video and best regards from Germany. … 👍

@MotoMirius 20 дней назад

Nice work! And thanks for the link - that will be very useful for people

@gwiazdasmsu 2 года назад

I block of the hole in the Carbotuer, what to do with the Rubber pipe comming in to the pump, closed it, or just leave it open

@MotoMirius 2 года назад

If you are keeping the pump, either remove the pipe and block at the pump, or just fold the pipe end so it remains clean and tuck away.

@abigail_mcleod 3 года назад

I dont have those paets on my xvs 650. The bagging you meant are the kick back ? I love those kick back sounds like my old harley davidson. I havs that kickback sounds since i use Chromoline exhaust.

@MotoMirius 3 года назад

There are different causes of the siund but normally louder if you are not running the stock system. Different people like different levels of sound and depending where you live there may be legal controls enforced. So there is no global right or wrong.

@abigail_mcleod 3 года назад

There are only two Legal aftermarket exhaust system we can buy for xvs650 in swiss which are Silvertail and Cromoline . and ws should keep the DB killer inside. So it stay below 90decible. before i changs the pipe the stock deliver quiet sound more like a seqing machine. The kickback i mentioned is when after accelerating and lose it i heard the kickback like shooting .i have that sounds even in " idle " on my last harley sporster. Thank you Sir and wish you have a nice weekend.

@MotoMirius 3 года назад

@@abigail_mcleod There are a couple of causes. Often happens when you've accelerated and then you shut down the throttle hard (say accelerate out of a hairpin then shut it down hard for the next hairpin bend, especially downhill) - so these is unburnt fuel which is ejected into the hot exhaust and explodes. Can happen too with the choke on, so not all the fuel burns. This is OK. But it can also happen when the mix is too lean. When you fit a high flow exhaust you also check if you need a bigger jet in the carb. If this is the cause of the backfire then it can be damaging your engine. Happens on all bike, Harley or Yamaha. So you need be sure which you have because engine rebuilds are much more expensive than exhausts and getting a mechanic to check the jetting.

@abigail_mcleod 3 года назад

@@MotoMirius oh my now it scares me 😥 but when i bought that exhaust it says no jetting needed. and true Sir . it happens when i go downhill or remove the trottel but not when the choke on and actualy the exploation is not that loud compare to old harley . almost non but are there . so maybe not much Fuel burns in exhaust ? Btw Sir , i wish you are my neighbour but Lord God said no maybe Lord think i will bother you everyday. 😂 Best regards

@MotoMirius 3 года назад

@@abigail_mcleod If its downhill then that is generally OK. Tuning is complicated. When you ride high up, the oxygen levels are lower so the ignition of fuel is less efficient. With modern fuel injection this can lead to problems - but not so much with carbs.

@GeorgeGiannakopoulos_ 2 года назад

Does this affect the relanti of the motorcycle if this valve is removed?

@MotoMirius 2 года назад

This is a control to remove emissions inside the exhaust. It does not affect the operation of the engine.

@clarkkent2174 2 года назад

I can’t seem to find the right side engine bracket that you used to replace the ais one. Would you happen to have a link to it?

@MotoMirius 2 года назад

You want the left hand bracket - part 4VR-21317-00 It fits both sides, you may have to hunt a bit to find one in stock or find a used one.

@clarkkent2174 2 года назад

@@MotoMirius Awesome, thanks!!

@user-gg7fm3qk5r 8 месяцев назад

I have a 650 I’m doing this to, could you please tell me what size the brass fittings are that you used to cap off the ports. Thanks in advance

@MotoMirius 8 месяцев назад

Hi, as per the video description the pipes from the heads have a 12mm OD, so you will need to find a fitting that will match that - they vary depending on where you live in the world.

@user-gg7fm3qk5r 8 месяцев назад

Thanks again, the information is most helpful and much appreciated Keep it rubber side down brother

@danielholliman4960 3 года назад

Does it cause the engine light to come on with this removal??

@MotoMirius 3 года назад

No. This does not affect the engine, fuelling or engine management system. This is a control system for unburnt fuel in the exhaust. I should clarify - these don't have an O2 sensor - if you have a later bike fitted with one then it will have a different AIS system because the injection of O2 to burn the fuel will cause the sensor to report false values.

@vegaspitbikes 2 года назад

I have the 2021 XV250 and it's got literally the exact same unit just in a different location. Funny how Yamaha made a one size fits all for that part but no others.

@MotoMirius 2 года назад

Ha! I guess it's a bit of an afterthought add on straight out of the stores

@rafaelruiz7246 2 года назад

where I can find the fitting and was the right name for the fitting

@MotoMirius 2 года назад

Fitting can be found in hardware or plumbing suppliers - it is a compression end cap used to close off the end of pipework. Exact name of the part depends on where you live in the world.

@surfagbg9102 Год назад

Thanks for video 😉

@MotoMirius Год назад

You're welcome 😊

@DomingosBruxo 3 года назад

Faço isso em algumas motos, ou apenas bloqueio os dutos

@MotoMirius 3 года назад

Você pode fazer tanto ou tão pouco quanto lhe convier

@DomingosBruxo 3 года назад

@@MotoMirius sim eu sei como é

@f-vex 2 года назад

hey just wondering if its necessary to cap them off or if it's just for sound etc

@f-vex 2 года назад

ah it sounds like its for compression

@MotoMirius 2 года назад

Inlet pulse jet can affect compression. The other tubes connect directly into the exhausts, so leaving them uncapped would make life more exciting.

@f-vex 2 года назад

@@MotoMirius sounds right up my alley! lol thanks!

@tskojec2740 Год назад

Hi. Question will this work if I remove it on my 1995Yamaha virago 1100?

@MotoMirius Год назад

It should, no reason why not though the details will vary.

@tskojec2740 Год назад

@@MotoMirius thank you.

@tomkil78 7 месяцев назад

Popping and banging is the one of the best features of AIS in XVS 650!

@MotoMirius 7 месяцев назад

You will still get it, just not quite as much!

@daniell274 2 года назад

Hope I’m not too late, the AIS causes pop and bang during decel. Question is will it damage the bike? Example causing the bike running hot and scorching the exhaust valve? Thank you 😅

@MotoMirius 2 года назад

No damage. This is an emissions control inside the exhaust pipe - temperatures are lower than the gases ejected from the engine directly over the exhaust valve

@daniell274 2 года назад

@@MotoMirius thank you ! Peace of mind knowing about it. I do hear from mechanic mention even with stock exhaust modern bikes will have decel pop due to the ais system, just that the stock exhaust muffled out the noise drastically. Thankx again!

@MotoMirius 2 года назад

@@daniell274 Modern bikes don't use AIS - Yamaha abandoned the system years ago. But yes, bikes do have decel pop because unburned fuel ignites in a hot header pipe - AIS was just an attempt to make the process more efficient but this was mostly before fuel control improved rendering the system redundant

@daniell274 2 года назад

@@MotoMirius 🤔 My bike cb650r uses pair valve system that draws fresh air into the exhaust when throttle off that causes decel pop. I thought that AIS and pair valve is the same.

@MotoMirius 2 года назад

@@daniell274 There are a number of systems AIS is the Yamaha patented name - SAI, PAIR etc all do much the same but on newer bikes are more to assist in heating up the cat faster. All are emission control systems, all can be removed without harming the engine.

@jorryntheabomination 8 месяцев назад

14:08 if your just trying to disable the AIS But leave it in the bike for the time being

@kolbyquiett1248 9 месяцев назад

What size is the plumbing pieces he is using

@MotoMirius 8 месяцев назад

Hi, as per the video description, the pipes from the heads have a 12mm OD, so you need to find a fitting that will match that.

@craigshelley3903 2 года назад

HI does this effect UK MOT

@MotoMirius 2 года назад

No, it doesn't. Bike MOT does not include emissions.

@NO-xc8iv 3 года назад

I'm doing this to my bike ASAP. It pops alot cause I have a free flowing exhaust.

@MotoMirius 3 года назад

It should help - won't necessarily fully cure it because sometimes like on overrun there will be enough oxygen and fuel dumped into the pipes to pop.

@ianscott9797 2 года назад

what is the plumbing fitting at 10:15?!

@MotoMirius 2 года назад

It's a compression fitting - different names in different parts of the world, but easy enough to find - it block off the end of a pipe.

@tobin2733 Год назад

I can't find the brass fittings. Qhat are they called or where can I find them online?

@MotoMirius Год назад

Called different names in different countries. You can find them in plumbing suppliers - a compression fitting to cap the end of a copper pipe.

@tobin2733 Год назад

@@MotoMirius I ordered some Swagelock 1/2" OD tubing end caps. I know you said the OD was 12mm but what is .038mm between friends? Lol

@momentoffaith2735 3 года назад

Is this all year models? I have a 98 650

@MotoMirius 3 года назад

I can’t say there won’t be some minor differences but it should be much the same

@momentoffaith2735 3 года назад

@@MotoMirius thanks for the awesome video and reply

@greggo7978 2 года назад

Has anyone put a 1000cc or bigger motor in a vstar 650 classic? I own a 2001 vstar 650 classic,it has a custom paint job,lots of being,lowered,so I've put a bit of money in it just because. I want to know if there's any possibility of putting a 1000cc or bigger motor in the 650 and what fab work etc is needed? Even converting to belt drive would be nice.Willing to do whatever to make it work but was hoping someone out there has done this already.

@verdigo5892 2 года назад

Just buy an 1100.

@greggo7978 2 года назад

@@verdigo5892 I agree brother,accept its going to be a 1700 if I find one I like enough.

@verdigo5892 2 года назад

@@greggo7978 Makes sense. I sold an 800cc Suzuki Boulevard a while back, and just bought an 1100 V Star. The V Star just seems heavier. Doesn't handle as well. Engine torque not that much different if any.

@user-ie3ex8tu2l 10 месяцев назад

Does the bike run hotter if I do tho?

@MotoMirius 9 месяцев назад

There is no reason why it would - this is an exhaust emissions control device.

@jaybilawchuk2225 11 месяцев назад

Can anyone tell me if removing/disabling this system changes rich or lean burn at all? Or does it all stay the same burn it had before. I can’t get any proper answers.

@MotoMirius 11 месяцев назад

It has nothing at all to do with the fuel or air intake to the bike - so the answer is that it stays exactly the same as before. This is a device which controls the burn of unburnt fuel ejected from the cylinder after combustion.

@jaybilawchuk2225 11 месяцев назад

@@MotoMirius ok thanks. My only concern was that these bikes are 20 years old and those steel lines can deteriorate and get leaks/small holes, etc. which in turn could change the mixture and throw off the burn. If you’re saying not then I guess it’s a non issue.

@MotoMirius 11 месяцев назад

@@jaybilawchuk2225 Your only risk is that you have an inlet leak from the connection to the inlet manifold that it uses to create a pulse to trigger the unit - so worth checking if you have concerns.

@danielt6275 2 года назад

The popping is the best part. Why remove it ?

@MotoMirius 2 года назад

If you have drag pipes then you will still get popping. Mostly the reason for removing it is cosmetics - it's a big ugly add on that does little and doesn't really need to be there.

@johnclark5956 3 года назад

Half inch will work to that what I had to use could now find 12mm

@MotoMirius 3 года назад

Only one way to find out, depends how much squish you can get from the olive. This is what I feel like when I try to buy Imperial bolts and parts to fit the Harley.

@johnclark5956 2 года назад

Half-inch pressure fittings will work as well

@jamesmcbrayer4324 3 года назад

Could you tell me what size the brass caps where

@MotoMirius 3 года назад

It's a 12mm pipe

@johnclark5956 3 года назад

What is the part to take the tubes off of a 650 Yamaha v Star called. For the AIS system

@johnclark5956 3 года назад

@@MotoMirius what are the brass caps called to slip over the pipes that come out of the heads for the AIS system

@MotoMirius 3 года назад

@@johnclark5956 Typically they are called compression fittings - check out your local plumbing supplies - names vary depending where you live!

@johnclark5956 3 года назад

@@MotoMirius thanks I have it done now sound good still has alittle bit of popping but not as bad only when down shifing

@sorrowr6king 3 года назад

Can you tell me what plumbing fitting that is?

@MotoMirius 3 года назад

Its a compression stop end fitting - but probably goes by different names in different countries.

@chrishookins9780 3 года назад

In America we call it compression fittings. Beats having to flare copper pipe tube ends. I wonder if a copper fitting shark bite plug would work.

@MotoMirius 3 года назад

@@chrishookins9780 There are lots of options here if you are creative. I chose what I did because all the changes to my bike are intentionally reversible, but there are always ways...

@bt5049 3 года назад

What size are the fittings?

@MotoMirius 3 года назад

@@bt5049 12mm ID

@oldfartuk 3 года назад

i like the popping and banging .. ill leave my pair on ..

@MotoMirius 3 года назад

Mine still pops and bangs a bit - didn't worry me either but I needed the space for something else I've had the parts for for over a year

@rotchitzenit3316 2 года назад

Hello. Why I have oil leaking and inside the AIS?

@MotoMirius 2 года назад

AIS isn't connected to any part of the oiling system, so that suggests you've an issue in the heads or the crankcase ventilation system is blocked

@Randomhero413 2 месяца назад

Dying to hear it run before and after.

@MotoMirius 2 месяца назад

Well, I'm not going to put it back on, so that might be difficult! It still pops and bangs on the over run, just not quite as much as before, but most importantly it looks so much better!

@Randomhero413 Месяц назад

@@MotoMirius hahahahha

@Randomhero413 Месяц назад

@MotoMirius I've got the Vance and Hines pipes on my 650Custom and it pops bangs and chugs a bit too.

@pashichosipov3534 3 месяца назад

С удовольствием посмотрел

@MotoMirius 3 месяца назад

Спасибо

@ThatBikerDad Год назад

Thunderbike actually do an AIS delete kit for €30

@MotoMirius Год назад

Sounds good, I'm surprised it's not more common

@Ok-ng4lf 3 года назад

What size brass caps?

@MotoMirius 3 года назад

To fit a 12mm pipe

@earlgallup5223 23 дня назад

Complete waste of time makes no difference whatsoever😂😂

@MotoMirius 23 дня назад

Doesn't need to do anything, just cleans up the look of the bike - if you are going to make a bike that looks like an old Harley then why would it have piping around the engine?