Tech talk: AIS / PAIR valve , the most misunderstood system on motorcycles today

[@pulgas_ph]

This is a great post. All this time I was misled to believe that my bike pops because it is lean which is not always the case.

[@romand123]

Thanks for the explanation. My KLX 300r’s header pipe was glowing red at low idle scenarios/trail riding so I disabled the pair valve. The result was that the header pipe doesn’t turn cherry red anymore…saved me $450 as I was going to purchase an ECU.

[@josephmears3537]

Im picking up one of these tomorrow. It has a pro circuit slip on so im curious if this mod was done to it already. Guess ill find out tomorrow

[@romand123]

@@josephmears3537 nice, you're gonna love it!

[@QuickShiftMoto1]

Great post David! So much misunderstanding about this system. The system is actually advantageous on a stock bike without decat.

[@mr__pool_4256]

This has been very informative thank you. I am very sorry for the environment but I can’t deal with the popping (and people talking about the popping) and flames with my Cobra Shotguns I am stuck with thanks to the previous owner.

[@corner_store_bill]

Thank you. I learned something today. I'll keep it on the bike.

[@michaelhefford6420]

100% improves start off from stop on a DR650 and low speed riding surges. Also eliminates popping…my bike is stock otherwise. No aftermarket exhaust.

[@JasonVandermeulen-z9e]

Great video! Planning to do block off plates on my 2013 Honda Cb1100 after I installed a catless exhaust setup.

[@leea.3772]

Please report back after you do. I have the same bike with full delkevic exhaust:

[@MultiDreamer1979]

Great stuff man I just did mine on my 2024 MT-10 SP and put a woolich tune on it as well it still needs some tweaking but boy what a difference 🎉

[@vcyclenut]

woolich doesnt make tunes, woolich makes software and hardware to allow someone to tune.

[@georgemcpherson3706]

On a tuned bike with a full (catless) exhaust if you don't want the flames/decel pop block off the airflow, plates are pretty expensive for what they are flare plug and cap work just fine, good information in the video though.

[@drunkpolack7612]

Bought some off aliexpress for 12 bucks, definitely worth it

[@dillonskinner5496]

I just capped my line

[@Dat_Zupra_Dude]

If someone WANTS the flames and pops on decel and keeps the factory PAIR/AIS Valve system BUT removes the charcoal canister and caps the purge valve hose, then is it possible to still have flames and pops on decel ??

[@brandongreene9615]

Doesn’t this feature make the bike slow down a lot when you let off the fuel?

[@nimaO_G]

Would blocking off the tube that goes into my Airbox be enough? I have a k9 gsxr600 and I have an ecu flash tune because of my cat less midpipe install.

[@kidlo2050]

Instructions unclear My bike hugged the tree with me

[@vcyclenut]

This was not an instructional video

[@DonTharp]

Thank you, appreciate it.

[@germanfrankovsky2213]

Great vidoe man! I was wondering if blocking the ais on a untuned bike can lean out the AF reading? After all, the air is injected in front of the o2 sensor, so theoretically it should read a richer mixture and withdraw fuel

[@vcyclenut]

Thanks !! The o2 sensor is only doing anything at light throttle and lower rpm. Also the ais valve is only open on closed throttle deceleration. The air fuel during decel is pretty irrelevant Here is a video i made about the o2 sensor kzbin.infosAVJ4bgi8cs?si=kO5fUAl7T2Q43cSt

[@jamespreacherbeck4306]

Still very novice in understanding of system. After getting your ECU flash and having Graves slip-on, leave alone this alone? Or will adding block off plates help more. Apologies for my ignorance.

[@vcyclenut]

No worries. Leave it alone. The bottom line is blocking off the ais never adds performance it just stops popping

[@Phantom_Gixxer]

you just saved me so much time and money

[@giddyup3443]

I wish I would have seen this before I ordered mine from a different company, had the bike tore apart way to far, wasted a ton of time because I couldn't get the throttle body off, gave up on the block offs since there isn't a gain after I saw this video,..

[@themightyquinn100]

This is really interesting! I have a carburetored 2012 Ninja 250. It has this system on it. But it also has a coaster enriching valve (air cutoff valve) attached to the carburetor which will reduce the amount of air flowing through the idle circuit on deceleration if the wheels are spinning the engine and the butterfly valves are closed. The purpose of this is avoid the lean condition at idle throttle with the engine still at high RPMs thereby reducing the popping and backfiring. It seems like this AIS and the coasting enriching valve conflict with each other. What are your thoughts on it?

[@vcyclenut]

No. They are both trying to reduce the amount of unburnt fuel coming out the exhaust

[@sergemcgraw6152]

Does blocking the PAIR valves on a non tuned bike (CB650R) with a aftermarket exhaust (no cat) affect the AFR ration in the combustion chamber? Because the O2 sensor in the exhaust will see richer mixture (because the PAIR are blocked, so no fuel is burned in the exhaust) so will assume the bike is richer than before and then leans it?

[@vcyclenut]

no, PAIR valves are only active at closed throttle and the stock o2 sensors are not that accurate that a small amount of air is going to change what it is doing. Also the stock o2 sensor is only active at light throttle and lower rpm's kzbin.info/www/bejne/fn3VpZ-CiKqXiNE

[@sergemcgraw6152]

​@@vcyclenut thanks mate. Doing this mod this week.

[@zombie1078]

This is a very interesting video, thanks. I've been thinking about doing this with my bike, because it has an aftermarket muffler on it and I'm not really a fan of the popping and crackling. I guess that it would be expected that the tip of the exhaust would get a bit of soot around it after blocking the pair system?

[@vcyclenut]

Glad it was helpful! Yes getting some soot on the tip of the exhaust is always normal.

[@BrewProof]

my method to block off: remove valve and short tubes from between plates, remove longer hose to airbox, cut hose from airbox to fit between plates, connect both plates to each other without valve using the cut piece.. fill the hole in the airbox with a dab of silicone

[@zackaryschrimsher7319]

How well does this work ? Thinking of doing it atm

[@GeneralBW]

It works just as good as block off plates.

[@SahibNoor123]

Does bike show engine error after removing it?

[@vcyclenut]

Depends on the bike

[@SahibNoor123]

@@vcyclenut z900

[@vcyclenut]

@@SahibNoor123 I’m not sure I don’t have enough experience with that platform to say

[@InfintrusHD]

I appreciate this video a lot, it really cleared up a lot of questions I had about this! I notice you did mention that installing the block off plates would eliminate the popping/ backfire. If you have block off plates installed, is it still possible to have popping on decel? I would like to have some popping, but nothing crazy as I'm getting a full exhaust for my '19 R6.

[@vcyclenut]

Glad you liked it No. If you like popping on decel do not install block off plates.

[@juanmaza8575]

great video! so the block off plates on EFI bikes block air from coming in from the AIS and does not cause any sealing issues in the future?

[@vcyclenut]

Thanks Sealing issues for what?

[@cyberkiller83]

i dont understand why for flashing is required to eliminate que AIS system in order to get accurate readings... so how the stock ECU does it with the system in place on the first place?

[@vcyclenut]

Stock o2 sensor is a narrow band only for emissions. Doesn’t care if it’s a couple percent off Also the system when working properly is only active at closed throttle. Air fuel at closed throttle is not very important When tuning I want to be 100% accurate and can’t take the chance the system is leaking and bleeding in air during open throttle

[@YoungBossSteppa]

So it can still pop even with the blocks offs and the tune.

[@vcyclenut]

Some small popping /gurgling on decel with aftermarket exhausts is inevitable ,but you should never get machine gun pops or loud booms and flames on decel with block of plates. If you do they are leaking.

[@romanhrytskiv8845]

Why gen3 mt09 doesn’t have this system in place?

[@vcyclenut]

You would have to ask Yamaha that question

[@Jettset80]

So you said if your tuning a bike you prefer the block off plates so you get an accurate AFR readings. But if they are only working on decel or closed throttle what does it matter? If they aren't doing anything while cruising or acceleration how would it affect afr I don't understand. Im not trying to be an ass, as an amateur tuner im trying to understand

[@vcyclenut]

because they can leak. The valve should only be pulling air at closed throttle, correct, but I am not trusting my work to a rubber stopper against a hole.

[@Jettset80]

@vcyclenut That's true I didn't think about that , makes sense

[@FaithisKey792]

Amazing thank you.

[@Jurshhh]

After installing a exhaust and leaving the AIS open does it have any negative impacts on MPG??

[@vcyclenut]

No

[@JordanSmith-bt2sq]

Great video, I already installed a full exhaust and got ecu flashed, can I install block off plates without needing another flash?

[@vcyclenut]

only thing that may happen is a check engine light for unplugging the ais solenoid what bike and who flashed it?

[@JordanSmith-bt2sq]

@@vcyclenutFlashed by Moore mafia they disabled pair valve so I don’t think i would get a light for removing it. I still would need to use block off plates to stop decel pop right?

[@JordanSmith-bt2sq]

@@vcyclenut 2024 Ninja 650

[@vcyclenut]

@@JordanSmith-bt2sq yep. Or just plug off the pair valve line as it comes off the air box

[@JordanSmith-bt2sq]

⁠​⁠@@vcyclenutCool man thanks for the guidance, much appreciated

[@X4Piper]

Where is this located?? Someone said do marble mod on my GSXR but nothing points to where it is just plug 1 of the 3 hoses.

[@vcyclenut]

It’s on top of the valve cover on the Gsxr. You want to block the line that goes up to the airbox

[@C.I.A_Unclassified]

Do you need a dongle to put into the stock connector so that it doesn’t throw any engine codes?

[@vcyclenut]

Depends on the bike

[@DaBuGzLiFe]

Tareq brought me here, Im looking to get flames shooting out of my ZX4RR as well. Would buying your tune do it? Or do I need this as well?

[@vcyclenut]

You DONT want these if you want flames Are you running a full exhaust? If so we can get it to shoot flames You will need my flash www.vcyclenut.com/store/p241/Kawasaki_ZX4RR_%2F_ZX4R__ECU_FLASH.html Then you will unplug the pair valve and it will pop and shoot flames on decel

[@DaBuGzLiFe]

@vcyclenut when I have time, I will get the ECU and mail it to you for some sweet, sweet flames 😍 I'm going to get a full exhaust soon so I'm guessing I'll wait till it comes in.

[@vcyclenut]

Yes. It won’t shoot flames without a full exhaust. I sell most of the systems out and have great prices. Let me know what one your looking at

[@2wheelsmorereels]

hi, thanks for the video! I’m just curious what happens if we get the selenoid out and plug the hoses directly ?

[@vcyclenut]

Most bikes will throw a check engine light if you unplug the solenoid without disabling the code in the ecu Plugging the line is a free way to block off the ais.

[@2wheelsmorereels]

@@vcyclenut i couldn’t explain myself correctly 😅 i want to link hoses together so it can drag air all the time. what are the consequences?

[@vcyclenut]

@@2wheelsmorereels just lots of popping and🔥

[@2wheelsmorereels]

@@vcyclenut i like that 😆 thanks!

[@thehoodieguy3491]

Nice explanation! When the ECU flash disables the AIS, would it achieve the same as installing the PAIR valve block-off plates (provided that the rubber seals are functioning) and no pops on deceleration? Also, will the AFR be affected when the seals fail because it constantly draws fresh air from the airbox to the exhaust?

[@vcyclenut]

In theory yes. But it’s pretty rare they seal up completely It won’t affect the actual air fuel ratio. Just what a wide band o2 sensor would read because the fresh air would dilute the exhaust gasses

[@whatspeedlimits]

Where are you located? I am also a bike nut...and also own my own motorcycle dyno. Would be cool to hang out with fellow minded people.

[@vcyclenut]

very north west corner of Washington state, you?

[@kalatonggek]

i remove the breadbox of my z900 and installed an aftermarket pipe. however, i leave the catalytic converter intact. now my bike is popping on the deceleration. my question is will it hurt my bike if i dont retune. Thank you.

[@vcyclenut]

I haven’t tested the z900 like that so I can’t answer your question

[@Matthew-z4u]

Hey I recently flashed my ecu on my Zx4rr. I have only a slip on and I did disconnect my o2 sensor but do I need to do anything to the AIS/pair valve for just a slip on? Thanks!

[@vcyclenut]

did I do the flash? If so I sent the ecu back with an information sheet.

[@joeydube420]

should i block off these things on my cbr1000rr before a performance tune?

[@vcyclenut]

I would yes

[@Tracer847]

is it bad that I have a factory exhaust and have disabled this system?

[@vcyclenut]

No. Just didn’t accomplish anything really. Unless you’re analyzing the exhaust gas for air fuel ratio.

[@Tracer847]

@@vcyclenut Thank you very much for the reply, I just wanted to know if I am doing any damage to the fuel ratio and the engine in general

[@CaptainPetrolburner]

OK David, big fire balls might help keep me from getting passed into turn 4 at PIR. 😂

[@vcyclenut]

LMAO!! the smoke screen I did would be more effective

[@revvedout857]

Can you tune with a rapid bike race on the bike? Will an AIS delete help the rapid bike module adjust better?

[@vcyclenut]

Ive run into issues before with the rapid bike. Yes you should block off your ais to give the rapid bike the most accurate exhaust readings. Im surprised it didnt say that in the instructions for it.

[@revvedout857]

@@vcyclenut i didnt install it so i dont know. im going to email you with some questions.

[@DonTharp]

Thanks. I would think the valve would cause more carbon build-up, if so that alone is reason enough to be rid of it. What's your thoughts?

[@vcyclenut]

carbon build up where?

[@dav8388]

you mentoned an aftermatrket exhaust without a cat, but what about one with a cat. I just put a Kelpi exhaust on my 24 XSR900, and I noticed the poping on decel. I knew it was this system doing what it was designed to do, but would it damage the aftermarket cat by disableing this system? i realy don't care for the pops, and would rather it not do it.

[@vcyclenut]

The 24 xsr does not have an ais system to block off or disable

[@dav8388]

@@vcyclenut oh ok. Learned something new. I honestly never looked into it just assumed it did lol. When I put the bike away for the winter I'll send ya my ECU to do your magic.

[@grantking7833]

Could a person pick up two rubber plugs and cap off both inlets of the pair valves?

[@vcyclenut]

you could, yes some bikes without the ecu flash to shut off the check engine light unplugging the solenoid will create CEL. So you may have to leave the solenoid plugged in anyway

[@raulx.garcia9387]

You can use a marble to take care of this in less than 5 minutes.

[@vcyclenut]

Yep. Most bikes it takes more than 5 minutes to get to the ais system but yes you can block off the ais line if that’s what you want

[@7fold4ever]

Most bikes come lean from the factory

[@vcyclenut]

Most factory fueling is lean at part throttle but rich at full throttle. What does that have to do with the ais system?

[@hossor123]

Can i install this on my mt09 2021.. i want more pops and bangs!!

[@vcyclenut]

No. You bought the wrong bike for decel pops and bangs

[@hossor123]

@@vcyclenut Crap! Drill a small hole pipe before the muffler? or get a MT10 2022?

[@hossor123]

so a specific pops and bangs tune wont do much on a mt09 gen3??

[@vcyclenut]

@@hossor123 i vote mt10

[@vcyclenut]

@@hossor123 not without doing stuff i would not do to my own bike

[@DonTharp]

Carbon in head?

[@vcyclenut]

No. It doesn’t do anything in the combustion chamber. Carbon build up is from having left over fuel. This eliminates that by burning it off. If anything it would reduce carbon build up in the exhaust port

[@alexpearson7693]

Why not just cap the stock plates?

[@vcyclenut]

Sure you can do that. easier to just cap the line off the air box but either way works

[@marcialquinones5683]

I HAVE CBR1000RR2007 WHIT YOSHIMURA MUFFLER AND POWER COMMANDER I dont not exacly is good you recomended is better doe

[@albrechthilker9072]

You do not show a diagram where the valve is mounted in the motorbike. Just bla bla bla.

[@vcyclenut]

Sorry you thought my video sucked.

[@mharjustinoespina890]

You have to have a bike with AIS so you'll know.

[@BrandonMiracle-d1b]

What a useless comment. If you're watching this you should already know/have no difficulty finding all other relevant information on the subject, eyesight and basic mechanical inclanation go far.