Very rare someone gives me the feeling they've forgotten more than I'll ever know, but man you can tell this fella has spent years and years on, under, inside, and next to bikes.
Do you think I would have to worry about any buildup at the cat on 23 ZX6r if I do the pair valve block off and have factory headers and cat with an m4 slip on
Don't be afraid to be "technical" it's interesting,not boring at all. This is why i watch your channel,you explain pretty well. There is a similar system on cars,it's just an air injection pump ,pumping air to the exhaust manifold to reduce emission during the closed loop period.
michaelovitch those pumps are mechanically driven, help seal rings and prevent pumping losses. They also run for seconds at a time. Ever try one on a street bike? The oil pressure light glows in seconds?! Is it starvation, our just tricking the switch?...how many engines are YOU willing to kill to find out?
I don't understand what the oil pressure light have to do. I miss something ? I just said there is a similar system on cars,except it's an air pump,mostly electric,it's not a venturi system like here.
Brock Davidson hey Brock love your videos man . So I have a 2014 gsxr750 and I’m blocking off my pair valve , there are 3 hoses I’m blocking . 2 of them come from the valve itself and the other hose is connected into the pair valve solenoid . My question is do I block the hoses themselves or the ports coming from the valves and the other one going into the solenoid
Thanks for taking the time to make this video Brock. It makes total sense now about what the PAIR valve does and how it affects the motorcycle. Great comment at the end about how the valve will give a false 02 reading.
Absolutely. Could be why some people don’t get the performance out of their aftermarket exhaust too. If they don’t take into account the false o2 reading with out the block off.
Found a marble as mentioned on my K5 gixxer 1000. Removed it and heard that pop, didnt like it. Blocked with marble again. Now i understand the workings and why. Thanks for your awesome videos.. Keep them coming.
Thanks Brock! I almost sold my bike that I bought with an auto tuner already installed bc it did not have the pair valve blocked off and was running poorly. This video really helped. You are the man!
Mate that's awesome, very informative. I've read a lot of BS on forums about the PAIR valve and what it does etc but you cleared up any blurry bits and un-truths. Thank you.
Thank you, Last year i bought a 21 R1 and ive been planning on getting it flashed and tuned. I bought some block off plates and soon to be sprint filter, I did not have any idea what the block off plates do and was debating on even putting them on. Thank you for taking your time and explaining this
Thanks for the video. I just bought a 05 gsxr 600 and I had to go through all the wiring because they had it all messed up from adding led lights through the years so I cut it all out and had to properly fix all the connections right and make it look OEM and put new spark plugs air filter and oil change, radiator flush just normal stuff you would do when buying a bike that was ran hard it's whole life. Man does it run good. I also ordered brand new fairings but they won't be here untill end of summer so imma have to run older ones that don't look to good untill they come..
Thanks for posting, this is something I've looked through forums "researching" and I learned a lot. I like how simple your cap is, but I think I would love the pop too 😅
Thank you. That was so easy to understand the way explained it. I have a 21 zx10r , installed the woolich hardware and software. I have the auto tune. I ran the bike without deleting my pair valve and my AFR is super lean , or so it says . When I tune it and add fuel where it says it make the bike run like shat . So I got the pair valve block off plates ( Brock’s) sprint air filter, clutch springs, clutch mod, and I also got the supercharger gear cover for my H2. Im installing all parts today or tomorrow. I have your parts in all my bikes . Thanks again.
Thanks for the video because I got auto tune but I didn’t know that I needed to remove the pair valve. Now I know why my bike is running a lil rich. You learn something new everyday. Am waiting for my block off plates to come from you guys it’s in mail. I can’t wait to put it in and take my bike out for a ride. I also got the termination plug in the mail so I don’t get a code.
Brocks can we say, blocking pair port will prevent vacuum on port so inlet air pressure on airbox will be higher, which is a good thing if you want to get hp by tuning.
Great explanation! I consider my self proper schooled (as far as knowing what this is about, and what the ups and downs are). Thank you for smacking some knowledge on the community :-)
so for tuning purposes, you need to block the pair valve so you don't make the bike run too rich but when the tune is done you can unblock the pair valve again to get the sweet decell pops and not lose any power?
Yes. But, if you want to run an auto-tune or something like that, you will want to use block-off plates. Your autotune sensor will identify false A/F ratios if your AIS has a part in the output data. You want to eliminate that noise from reaching the sensor so when you open up your auto-tune tables and apply adjustments, they will be true values. If your auto-tune is reading data off the AIS system, your adjustments values will be fake & likely reduce power for fuel economy... who needs that! xD
Brock videos are great but to far in between we need more please. And what you said at the end about you need to block the pair valve when you tune the bike can you show us exactly what you mean when you get to the part where you are going to fit the power commander Thanks
I have done this mod to my bikes before getting dyno tuned so to get correct AFR. Saves a little weight too. Use a jumper mod plug to stop fault or disable fault code with flashtune/woolich racing. Great videos BTW.
I bought this one on ebay "PAIR Valve Eliminator with SMOG block off plates Kawasaki ZX10R 2004-2010" search that on ebay. costs a little bit more but comes with the the plug that stops the error code. i am not advertising for them its what I bought for myself and it works.
Thanks Brock . I've never learnt about these or seen one until I got my latest bike a few years ago . Thanks for explaining it so well . I will definitely stay tuned to your page
Thank you help me out a lot. I’m trying to figure out the wiring for my CBR 250r on a project. I’m putting the motor in a go kart. Could definitely use more help. Trying to find out what I need for the motor to run and run correctly.
Thank you for that nugget of information. I've recently acquired a 1999 Suzuki VZ800 Marauder that has Cobra exhaust...if I get the dreaded excessive and annoying pops I now know what to do. Again thank you, and wonderful video sir.
i read somewhere when you block PAIR from the intake box, its frees up more air pressure in the airbox for the engine to use...perhaps only during the low and mid range because as you showed it doesnt do anything in high rpm..
Hey Brock, I really enjoy your videos and how you take the scary out of all the new high tech wizardry in engines now. Can I pick your mind regarding the PAIR system. In the old days, you could put your hand over the exhaust and determine if your bike is running lean or rich. I kept testing my bike's carburetor and assumed it was running decent; however, my mileage dropped and I noticed this. My fuel range was so off, I could not figure out why I did not diagnose or notice a rich powerband. My question to you is, do you know of any other method other than a diagnostic tool that can quickly and accurately tell a tuner if the carburetors are set in the sweet spot through the powerband? I did notice extra heat through the pipes. Another source of this heat is the headers; such as rust or what happened to me, the previous owner did not bother to use any header cones, thus, producing a leak and a drop in engine performance overall. The natural thing when you have this power drop is to turn up your fuel-air mix exacerbating the situation even more. So my question is, do you know of any method when you put something over the exhaust and do a sniff test for running rich? The scope of your knowledge and the process you use to simplify the understanding of the topic speak beyond the science of it.
on my carbed SV i disabled the PAIR system by plugging it, because test showed 2 heads one with disabled and one with enabled PAIR, enabled PAIR was burning the valves and valve seats away earlier than disabled one
I'm having idle surging at warm idle on my 2013 gsxr750, full exhaust system with flashed ecu. Going to unblock my pair hose to see if that smoothes things out. Thanks!
@@BrockDavidson Hey Brock thanks for the reply. My tuner from out in Washington area told me that idle surge is normal on gsxrs because of the lack of back pressure. Did not offer any other solutions. When you did that paper suction test, the increased rpm seems like it could help my situation. Will be giving it a go this evening after work. Figure trying the least expensive fixes first 👍🏼
Hey Brock, Thanks for putting this together. Very informative. I bought a bike that has a full exhaust, however the pair value (electrical wire) was simply unplugged. No cap on the vacuum line itself. Bikes developed a surging issue, changed rectifier ignition coils and spark plugs. Do you think the pair valve can be causing a surging issue at idle? When I drained the oil I smelt fuel. Maybe not enough air to combust the fuel causing it to leak down into my crankcase?
No. The pair valve has zero to do with how the bike runs. It simply injects air into the exhaust pipe, after the combustion process, to help the cat work correctly. The chances of bad OEM components causing the problem are near zero. Sounds like you need a proper flash and tune. Get with Chris Moore at mooremafia.
When is the pair valve commanded closed by the ecu? 2016 zx14r here. Keen air still unblocked. The '16's O2 sensor is installed in an aftermarket pipe. Ecu re flashed and dyno tuned. Only slight pop, just on decell. Bike responds well . Fuel consumption remains or is better than stock exhaust during light throttle cruising. J
Can you please do a video on oxygen sensors and whether you need them or not when you go from an OEM system to an aftermarket full system with a power commander ? Thanx.
Hello Brock, Thanks for the very informative video. My question is what is happening if you trying to tuning the fuel with secondary pair valves connected but also enabled the pair valve system as it is working as a stock? Will you see wrong AFR in the wideband gauge? I did a dyno test on my injection Honda Hornet 600 (about the same engine as a cbr600rr 07-12) and the afr was 12.5-12.6:1 at WOT from 3000rpm to 9500rpm and then 13-13.4:1 from 9500rpm to the rev limiter . The oem enabled secondary pair valve valve blocking the fresh air at WOT conditions? Thanks
@@BrockDavidson sorry for mis-understanding. I meant the pair valve system to be fuctional and connected as it works from oem and in the Fi code you choose the option enabled. In that case the AFR your receiving from a wide band controller is it correct? Does the option (enable pair valve in Fi code), makes the valve system to close the path of the fresh air from the airbox to the exhaust ports in high load conditions?
"enabled" means the light shines. "Disabled" means it doesn't. It's nothing but a nucince light eliminator...just a bit cleaner than a piece of electrical tape on the dash. Functionally speaking, the PAIR still works unless it's blocked or removed.
@@BrockDavidson So if you connect a wideband gauge on a dyno to a complete standard bike as for example a gsxr 1000 '17 model, in the pull up time of accelaration from low to mid rpm's the afr readings will be incorrect? Does the pair valve system have a function controlled from the ECU to engaged or disengange the free air path, depending the conditions of the engine load?
The PAIR's job is the help heat the cat under cruising speeds....some stop working in high rev's, some try, but are stuck....some stay open. This is why they MUST be blocked when reading AFR, by any means.
Hi Brock, I love the vid. I have a 2005 Gsxr 1000 with a bmc filter and a yoshi slip on. My bike is going in for an ecu flash and dyno tune in Jan. I love popping sound on decel but obviously I'd choose performance over it lol. Should I order block off plates and install them before doing the flash and tune ?
@Irsha -There is no need to for you to disconnect the PAIR if you like the popping sound. Your dyno operator will have the ability to temporarily block the PAIR for tuning (plastic cap, hemostats or even a simple piece of tape) and then remove the temporary block after the tune.
G'day Brock. Great video thank you.I have a 2023 GSXS750 that has a slip on muffler but stock headers with the Cat. It has just been tuned. It was tuned with the pair blocked of course. I have removed the plug in the Pair line and it idles a bit smoother and I am getting bangs and pops on decel. The decel fuel cut is also switched off. Should it still do this with the Cat not removed? Will it damage anything? Thanks.
@D3P D3P we cover exhaust theory in 3 parts of Episode 4 earlier in the series - here is the exhaust butterfly, otherwise known as EXUP valve: th-cam.com/video/MzhlPRSoMho/w-d-xo.html
Mr. Brock I am about to buy a 2024 hayabusa. I plan on having the pentacarbon full exhaust, sprint air filter, and a moore mafia tune. I love the pops and bangs on decel, so do I still need to have the pair valves disabled but not blocked off to achieve that?
Chris builds those into the tune, regardless of if the PAIR is blocked or not. He can guide you to the best settings. I must warn you...those pops can damage any carbon tipped muffler.
Couldn't a deletion of the PAIR system help keep those vacuum pulses in the exhaust which helps with cylinder evacuation? Seems like that could help free up some power there but maybe minimal.
The gains noted from removing the intentional injection of burnt/O2 free air directly in the the inlet track are measurable. Any increase in exhaust scavenging is not.
THANK YOU Brock for very informative video, but you didn't answer one last question - If Pair valve not relevant to combustion and only relevant to exhaust why does the bike change its running "note" and sounds better when PAIR is blocked with paper???
@trying - it doesn't. You are hearing the change in pitch from the PAIR when blocking the hose as well as unnatural intake noise (airbox removed). These sounds are masked when the airbox is installed and the hose is connected to the air box. Please remember - Injecting air downsteam of the combustion process... does not affect the combustion process.
@@BrockDavidson WOW, THX for fast reply but that doesn't make sense, im playing with my 09 Gsxr 1k with straight exhaust and if i block Pair it does seems to run more smoothly, to myself and after watching this video im thinking that once i block Pair A/F ratios becomes somewhat in line with what my stock ecu has in mind...
Hi My Suzuki m109r has high flow air intakes and aftermarket straight pipe exhaust , I took it to a tuner to flash the ECU he tried 2 times getting rid of the backfire obviously he doesn’t know anything, now I know and I’m going to block the valve myself. Thanks
@iceman Lol - not to cut your tuner any slack...but straight pipes have a tendency to backfire more. That said, if the PAIR isn't properly blocked, the popping will be even more severe.
Just bought a used track K7 GSXR 1000. I was making it street legal again and while going over the bike I noticed the aftermarket block off plates on the head. No idea what they where for. The bike has the exhaust O2 sensor port blocked as well. I'm guessing with knowledge bombs you so skillfully dropped in this vid this was done to accurately tune the bikes ECU? Is there any other was to verify that the bikes ECU has been modified? (there is no power commander installed, and no F1 light) Thank you so much for explaining the PAIR system!
The items you list are purely for emissions removal. The k7, are not highly restricted in the ECU and can be ECU tuned with a yosh clicker box. You should be fine. You would need to have your ECU read by an ECU tuner to know for certain.
on a bike with ram air it seems like some of the ram effect would be lost by air bleeding out through this port. Is that true or maybe not significant enough of an amount of pressure lost?
Hey Brock. That's a great video but raises a question I don't know the answer to. Could you explain please.... Assuming an after-market exhaust is fitted to my bike and I block off the PAIR valve, but leave the O2 sensor in place - if the O2 sensor's input to the ECU is trying to keep the fuelling in a certain range based on its fuel map and the ECU is expecting the PAIR valve to be injecting air into the exhaust (and so I guess richening the mixture to compensate for the air being let in by the PAIR valve) , if you block the PAIR valve it would make sense that there will be less air in the exhaust so the exhaust gasses would appear richer than they really are. Does the ECU see this then lean back the mixture even more? If so, is the best option when blocking the PAIR valve to also eliminate the O2 sensor? Thanks Rich
The stock O2 sensor (narrow band) only knows if it's reading Rich or Lean and will adjust to 14.7-1 (in the cruising areas of the map) regardless if the PAIR is removed or in place. Note: If a PCV and map are installed with the stock O2 sensor in place, the ECM will continue to work in the same manner, disrupting the functioning of a known good PCV map. The O2 sensors and PAIR are only for emissions and must be removed for race use. The only exception to this would be bikes with Bosch ECU's which work more like a car to adjust fueling all of the time.
Good explanation - succinct. Question: when disconnecting the PAIR solenoid control connector is it safe to NOT terminate with a dummy load? Can it be an open circuit and the ECU won't mind or should it have a load as it would if connected?? Best
@@BrockDavidson Thanks for your reply! Okay. Reason I ask, I did this on CB900F-5 (Honda 919) and they sent a 10k resistor in the HM090 blanking plug for the harness. (Can't flash a Honda ECU (well not that I'm aware of in UK)) HOWEVER, I hated the muffled sound, so I just put the PAIR back. (I use Akrapovičs with the baffle removed and they sound great) One more question related - if one likes the snap-crackle-pop of the roll-off when PAIR installed, why not just remove the control solenoid (heaviest bit) and leave the hoses connected, via a "Y" (or a "T"), back to the airbox and just let the reed valves control the flow of air? (I think they are 14mm hoses on the CB900F). Thanks for your reply!
@H Some older style bike work fine with a dummy resistor. You can remove the solenoid, but would have to confirm the external plumbing is configured so that the reeds continue to draw air from the airbox - if you want the pop.
did i get it right measuring exhaust gas emission on a stock bike will result ok but on a bike with blocked pair with stock parts measurement will show rich mixture ? if thats the case what will the result be on a blocked pair valve with an aftermarket air filter and exhaust ?
Great one! Just wondering, does pair valve mod & flapper mod work on the bike with the stock exhaust? Or only for with aftermarket exhaust? Please let me know. Thank you.
The cat in the stock exhaust can get clogged if the pair is blocked. flapper mod does not care what exhaust is on the bike. That said, if your exhaust can't flow enough - defeating the mod will not gain any additional power.
hello i put a 750 engine into my gsr 600 after that engine broke down . the bike sparks but it backfires or misfires alot . please any help i have changed the downcoil, pulse generator but still misfiring
So refreshing to see a guy that really knows his profession. Thanks Brock
YES & likes to share it!!👍👍
Very rare someone gives me the feeling they've forgotten more than I'll ever know, but man you can tell this fella has spent years and years on, under, inside, and next to bikes.
Thanks!
Do you think I would have to worry about any buildup at the cat on 23 ZX6r if I do the pair valve block off and have factory headers and cat with an m4 slip on
@@bicycless211 No, you'll be fine
@@MoswenMedia will the slip-on make it run slightly leaner if no tune or flash is done?
@bicycless211 Unless you get a full catless system, you won't run lean enough to necessitate an ECU flash
Don't be afraid to be "technical" it's interesting,not boring at all.
This is why i watch your channel,you explain pretty well.
There is a similar system on cars,it's just an air injection pump ,pumping air to the exhaust manifold to reduce emission during the closed loop period.
michaelovitch those pumps are mechanically driven, help seal rings and prevent pumping losses. They also run for seconds at a time. Ever try one on a street bike? The oil pressure light glows in seconds?! Is it starvation, our just tricking the switch?...how many engines are YOU willing to kill to find out?
michaelovitch ill get technical in my replies ;)
I don't understand what the oil pressure light have to do.
I miss something ?
I just said there is a similar system on cars,except it's an air pump,mostly electric,it's not a venturi system like here.
Brock Davidson hey Brock love your videos man . So I have a 2014 gsxr750 and I’m blocking off my pair valve , there are 3 hoses I’m blocking . 2 of them come from the valve itself and the other hose is connected into the pair valve solenoid . My question is do I block the hoses themselves or the ports coming from the valves and the other one going into the solenoid
Thanks for taking the time to make this video Brock. It makes total sense now about what the PAIR valve does and how it affects the motorcycle. Great comment at the end about how the valve will give a false 02 reading.
Absolutely. Could be why some people don’t get the performance out of their aftermarket exhaust too. If they don’t take into account the false o2 reading with out the block off.
Found a marble as mentioned on my K5 gixxer 1000. Removed it and heard that pop, didnt like it. Blocked with marble again. Now i understand the workings and why. Thanks for your awesome videos.. Keep them coming.
Thanks Brock! I almost sold my bike that I bought with an auto tuner already installed bc it did not have the pair valve blocked off and was running poorly. This video really helped. You are the man!
Glad to help. Lol, keep accepting the recommended map changes and watch your bike drink fuel and run worse and worse after every change ;)
@@BrockDavidsonWhat are you getting at with this comment? A blanket statement of auto tuners make bikes run worse?
Mate that's awesome, very informative. I've read a lot of BS on forums about the PAIR valve and what it does etc but you cleared up any blurry bits and un-truths. Thank you.
I happen to like the decel popping, you sometimes even get a little bit of flame, especially on certain bikes like the FZ-09.
Thank you, Last year i bought a 21 R1 and ive been planning on getting it flashed and tuned. I bought some block off plates and soon to be sprint filter, I did not have any idea what the block off plates do and was debating on even putting them on. Thank you for taking your time and explaining this
Excellent explanation Brock even for a old timer who's been riding and racing since the 70's. Yes I still miss playing with carbs on bikes. Thanks
Thanks for the video. I just bought a 05 gsxr 600 and I had to go through all the wiring because they had it all messed up from adding led lights through the years so I cut it all out and had to properly fix all the connections right and make it look OEM and put new spark plugs air filter and oil change, radiator flush just normal stuff you would do when buying a bike that was ran hard it's whole life. Man does it run good. I also ordered brand new fairings but they won't be here untill end of summer so imma have to run older ones that don't look to good untill they come..
Thanks for taking the time to explain what the system is and how it works.
Glad it was helpful!
I had my tuner turn off PAIR VALVE. I came back next day to turn it back on!!!!!!!
FLAMES, POPS, BANGS and exhaust note is so much better
An oldie but goodie.
Cant believe this video is 5 years old!
Working on my SV650, this video was super interesting.
Thanks!
Glad you liked it!
Best explanation yet of a pair valve. I'm leaving mine because it sounds awesome
Thanks Brock. I used a bolt to block my PAIR before sending my Gixxer to the tuner.
Why?
Brock u need a lab coat with ur logo on it!!! Luv theese vids
Thanks for posting, this is something I've looked through forums "researching" and I learned a lot. I like how simple your cap is, but I think I would love the pop too 😅
Some guys love the pop and just don't block it.
just wanted to say that this was very helpful and informative. Thank you
I can't wait to see the bike fully tuned.
Thank you. That was so easy to understand the way explained it. I have a 21 zx10r , installed the woolich hardware and software. I have the auto tune. I ran the bike without deleting my pair valve and my AFR is super lean , or so it says . When I tune it and add fuel where it says it make the bike run like shat . So I got the pair valve block off plates ( Brock’s) sprint air filter, clutch springs, clutch mod, and I also got the supercharger gear cover for my H2. Im installing all parts today or tomorrow. I have your parts in all my bikes . Thanks again.
Thanks for the video because I got auto tune but I didn’t know that I needed to remove the pair valve. Now I know why my bike is running a lil rich. You learn something new everyday. Am waiting for my block off plates to come from you guys it’s in mail. I can’t wait to put it in and take my bike out for a ride. I also got the termination plug in the mail so I don’t get a code.
@Pascal - glad to help!
Brock Davidson thanks keep the video coming.
You have to love and trust this dude.
Thanks for a really great, informative series of videos. I don't own a 2017 but tons of useful info.
still waiting for other episode. it looks like im watching game of thrones in a different way
Great explanation of what to do with PAIRS. My old SV1000s pops like hell but I kind of like it.
So leaving the pair valve connected will make the bike pop or blocking it?
Functioning = pop
@@BrockDavidson
I have since removed mine. No popping whatsoever.
You have a new subsciber all the way from Canada! Love the videos I've learned more in 10 minutes then I ever did in school lol.
On all 3 of my Busa’s we unhooked the pair valve from the air box and hooked it up to the crankcase. Free vacuum pump=free hp
We proved, undeniably, the gen 1 Busa pair valve mod slowed the bike down.
Brocks can we say, blocking pair port will prevent vacuum on port so inlet air pressure on airbox will be higher, which is a good thing if you want to get hp by tuning.
Great explanation! I consider my self proper schooled (as far as knowing what this is about, and what the ups and downs are). Thank you for smacking some knowledge on the community :-)
so for tuning purposes, you need to block the pair valve so you don't make the bike run too rich but when the tune is done you can unblock the pair valve again to get the sweet decell pops and not lose any power?
Yes. But, if you want to run an auto-tune or something like that, you will want to use block-off plates. Your autotune sensor will identify false A/F ratios if your AIS has a part in the output data. You want to eliminate that noise from reaching the sensor so when you open up your auto-tune tables and apply adjustments, they will be true values. If your auto-tune is reading data off the AIS system, your adjustments values will be fake & likely reduce power for fuel economy... who needs that! xD
GREAT VIDEO. I've seen lots of vidoes, but only you were able to give a clear description what a PAIR Valve is and how it works. Thanks
Glad it helped
I had an old '95 vn750 that popped like crazy. I just marbled the reed valves. No more popping. I'd fun to see a more thorough explanation though.
Best PAIR valve explaination online
Cashing in my GME and AMC!! I'm sold to these vids!!!
Lol dumb
Thanks for your prompt response Brock, I like your videos, they are so easy to understand and very informative too.
Great vid about pair valves. 4 into 1 exhaust & popping off throttle. I blanked off valve cover for easier removal as well. Disconnected wiring.
Brock videos are great but to far in between we need more please. And what you said at the end about you need to block the pair valve when you tune the bike can you show us exactly what you mean when you get to the part where you are going to fit the power commander Thanks
I have done this mod to my bikes before getting dyno tuned so to get correct AFR. Saves a little weight too. Use a jumper mod plug to stop fault or disable fault code with flashtune/woolich racing. Great videos BTW.
kornboy22 could you explain the jump mod?
I bought this one on ebay "PAIR Valve Eliminator with SMOG block off plates Kawasaki ZX10R 2004-2010"
search that on ebay. costs a little bit more but comes with the the plug that stops the error code. i am not advertising for them its what I bought for myself and it works.
Thanks Brock . I've never learnt about these or seen one until I got my latest bike a few years ago . Thanks for explaining it so well . I will definitely stay tuned to your page
Learned me something good today. Thank you!
awesome, thanks for sharing the info, together we're all a little bit smarter
Thank you help me out a lot. I’m trying to figure out the wiring for my CBR 250r on a project. I’m putting the motor in a go kart. Could definitely use more help. Trying to find out what I need for the motor to run and run correctly.
Awesome video I feel like I'm watching drag bike tuner school love the videos as always great job to Brock and the brocks team
Awesome explanation clarified all my questions
Thank you for that nugget of information. I've recently acquired a 1999 Suzuki VZ800 Marauder that has Cobra exhaust...if I get the dreaded excessive and annoying pops I now know what to do. Again thank you, and wonderful video sir.
Great video! Wish you were in my state. I'd have you tune all my motorcycles
blog.brocksperformance.com/ufaqs/do-i-need-to-physically-bring-my-bike-to-brocks-performance-in-ohio-for-a-performance-tune/
Thank you Brock, I learned a lot from your videos.
Glad you like!
Thanks Brock, amazing how easy it is to overlook the seemingly small things :-)
Thanks for the tutorial. Your name is part of my Z900RS now (block off plates) Ha!
This is a real knowledge.thank you
Great video. Thanks for taking the time to make these. Keep them coming Brock!
I did enjoy the video and I did learn something...thanks Brock!
One of the great video, thank you sir.
Great info. Thanks for putting the video together.
i read somewhere when you block PAIR from the intake box, its frees up more air pressure in the airbox for the engine to use...perhaps only during the low and mid range because as you showed it doesnt do anything in high rpm..
Don't believe everything you read on the Internet ;)
Everytime I'm learning something new :-)
Any updates yet??? im excited, just ordered a sprint filter from ya for my bike.
Great video. Very informative. Keep up the great work
Thanks again for doing these Brock.
Very good video. Informative. Thanks.
Glad you enjoyed it!
Hey Brock, I really enjoy your videos and how you take the scary out of all the new high tech wizardry in engines now. Can I pick your mind regarding the PAIR system. In the old days, you could put your hand over the exhaust and determine if your bike is running lean or rich. I kept testing my bike's carburetor and assumed it was running decent; however, my mileage dropped and I noticed this. My fuel range was so off, I could not figure out why I did not diagnose or notice a rich powerband. My question to you is, do you know of any other method other than a diagnostic tool that can quickly and accurately tell a tuner if the carburetors are set in the sweet spot through the powerband? I did notice extra heat through the pipes. Another source of this heat is the headers; such as rust or what happened to me, the previous owner did not bother to use any header cones, thus, producing a leak and a drop in engine performance overall. The natural thing when you have this power drop is to turn up your fuel-air mix exacerbating the situation even more. So my question is, do you know of any method when you put something over the exhaust and do a sniff test for running rich? The scope of your knowledge and the process you use to simplify the understanding of the topic speak beyond the science of it.
on my carbed SV i disabled the PAIR system by plugging it, because test showed 2 heads one with disabled and one with enabled PAIR, enabled PAIR was burning the valves and valve seats away earlier than disabled one
I'm having idle surging at warm idle on my 2013 gsxr750, full exhaust system with flashed ecu. Going to unblock my pair hose to see if that smoothes things out. Thanks!
Idle surge is typically caused / corrected by the flash. Also check throttle body sync.
@@BrockDavidson Hey Brock thanks for the reply. My tuner from out in Washington area told me that idle surge is normal on gsxrs because of the lack of back pressure. Did not offer any other solutions. When you did that paper suction test, the increased rpm seems like it could help my situation. Will be giving it a go this evening after work. Figure trying the least expensive fixes first 👍🏼
Amazing content, thank you for explaining !
Hey Brock,
Thanks for putting this together. Very informative. I bought a bike that has a full exhaust, however the pair value (electrical wire) was simply unplugged. No cap on the vacuum line itself. Bikes developed a surging issue, changed rectifier ignition coils and spark plugs. Do you think the pair valve can be causing a surging issue at idle? When I drained the oil I smelt fuel. Maybe not enough air to combust the fuel causing it to leak down into my crankcase?
No. The pair valve has zero to do with how the bike runs. It simply injects air into the exhaust pipe, after the combustion process, to help the cat work correctly. The chances of bad OEM components causing the problem are near zero. Sounds like you need a proper flash and tune. Get with Chris Moore at mooremafia.
@Brock Davidson thanks for the quick response Brock. Appreciate the help!
Brock where are you we need to see what you got up to waking up every morning hopeing for a notification for a new video.
Very good content . Thanks 👍
When is the pair valve commanded closed by the ecu?
2016 zx14r here. Keen air still unblocked. The '16's O2 sensor is installed in an aftermarket pipe. Ecu re flashed and dyno tuned. Only slight pop, just on decell.
Bike responds well . Fuel consumption remains or is better than stock exhaust during light throttle cruising.
J
Can you please do a video on oxygen sensors and whether you need them or not when you go from an OEM system to an aftermarket full system with a power commander ? Thanx.
ROMEO Please use the long description in the stock to Brock series to find a complete explanation of your question.
I just watched a video where big kountry said he wasn’t sure what these are, but Chris said he needs them . What a difference here 😂
Lol, Kountry is hilarious 😂
great video explaining sir
Hello Brock, Thanks for the very informative video. My question is what is happening if you trying to tuning the fuel with secondary pair valves connected but also enabled the pair valve system as it is working as a stock? Will you see wrong AFR in the wideband gauge? I did a dyno test on my injection Honda Hornet 600 (about the same engine as a cbr600rr 07-12) and the afr was 12.5-12.6:1 at WOT from 3000rpm to 9500rpm and then 13-13.4:1 from 9500rpm to the rev limiter . The oem enabled secondary pair valve valve blocking the fresh air at WOT conditions? Thanks
I don't understand your question? Please explain secondary pair valve vs. pair valve system.
@@BrockDavidson sorry for mis-understanding. I meant the pair valve system to be fuctional and connected as it works from oem and in the Fi code you choose the option enabled. In that case the AFR your receiving from a wide band controller is it correct? Does the option (enable pair valve in Fi code), makes the valve system to close the path of the fresh air from the airbox to the exhaust ports in high load conditions?
"enabled" means the light shines. "Disabled" means it doesn't. It's nothing but a nucince light eliminator...just a bit cleaner than a piece of electrical tape on the dash. Functionally speaking, the PAIR still works unless it's blocked or removed.
@@BrockDavidson So if you connect a wideband gauge on a dyno to a complete standard bike as for example a gsxr 1000 '17 model, in the pull up time of accelaration from low to mid rpm's the afr readings will be incorrect? Does the pair valve system have a function controlled from the ECU to engaged or disengange the free air path, depending the conditions of the engine load?
The PAIR's job is the help heat the cat under cruising speeds....some stop working in high rev's, some try, but are stuck....some stay open.
This is why they MUST be blocked when reading AFR, by any means.
Great video sir
Great explanation.
Great info ! Thanks!
awesome video. Thanks Brock!
Hi Brock, I love the vid. I have a 2005 Gsxr 1000 with a bmc filter and a yoshi slip on. My bike is going in for an ecu flash and dyno tune in Jan. I love popping sound on decel but obviously I'd choose performance over it lol. Should I order block off plates and install them before doing the flash and tune ?
@Irsha -There is no need to for you to disconnect the PAIR if you like the popping sound. Your dyno operator will have the ability to temporarily block the PAIR for tuning (plastic cap, hemostats or even a simple piece of tape) and then remove the temporary block after the tune.
Brock Davidson thanks Brock, really appreciate it
Great video!
G'day Brock. Great video thank you.I have a 2023 GSXS750 that has a slip on muffler but stock headers with the Cat. It has just been tuned. It was tuned with the pair blocked of course. I have removed the plug in the Pair line and it idles a bit smoother and I am getting bangs and pops on decel. The decel fuel cut is also switched off. Should it still do this with the Cat not removed? Will it damage anything? Thanks.
No engine damage, but the popping could damage your slip-on. Hope this helps.
Good stuff B, keep em coming.
If you wanted the bangs and pops but not as much could you use blank plug but drill tiny hole in so still draws some air in would that work thank you
On tuning with a catalytic do most tuner tune leaner or richer.
If possible would it be better to have a standalone wide band o2 before the cat.
Can you do a video on the exhaust butterfly valve? Thanks.
@D3P D3P we cover exhaust theory in 3 parts of Episode 4 earlier in the series - here is the exhaust butterfly, otherwise known as EXUP valve: th-cam.com/video/MzhlPRSoMho/w-d-xo.html
Mr. Brock I am about to buy a 2024 hayabusa. I plan on having the pentacarbon full exhaust, sprint air filter, and a moore mafia tune. I love the pops and bangs on decel, so do I still need to have the pair valves disabled but not blocked off to achieve that?
Chris builds those into the tune, regardless of if the PAIR is blocked or not. He can guide you to the best settings. I must warn you...those pops can damage any carbon tipped muffler.
@@BrockDavidson may not do the pops and bangs then.
Very informative thank you.
Couldn't a deletion of the PAIR system help keep those vacuum pulses in the exhaust which helps with cylinder evacuation? Seems like that could help free up some power there but maybe minimal.
The gains noted from removing the intentional injection of burnt/O2 free air directly in the the inlet track are measurable. Any increase in exhaust scavenging is not.
@BrockDavidson thanks for the reply, I realized later that these valves don't operate at higher rpms anyways so it wouldn't create any difference.
THANK YOU Brock for very informative video, but you didn't answer one last question - If Pair valve not relevant to combustion and only relevant to exhaust why does the bike change its running "note" and sounds better when PAIR is blocked with paper???
@trying - it doesn't. You are hearing the change in pitch from the PAIR when blocking the hose as well as unnatural intake noise (airbox removed). These sounds are masked when the airbox is installed and the hose is connected to the air box. Please remember - Injecting air downsteam of the combustion process... does not affect the combustion process.
@@BrockDavidson
WOW, THX for fast reply but that doesn't make sense, im playing with my 09 Gsxr 1k with straight exhaust and if i block Pair it does seems to run more smoothly, to myself and after watching this video im thinking that once i block Pair A/F ratios becomes somewhat in line with what my stock ecu has in mind...
Good info, thank you
Hi
My Suzuki m109r has high flow air intakes and aftermarket straight pipe exhaust , I took it to a tuner to flash the ECU he tried 2 times getting rid of the backfire obviously he doesn’t know anything, now I know and I’m going to block the valve myself. Thanks
@iceman Lol - not to cut your tuner any slack...but straight pipes have a tendency to backfire more. That said, if the PAIR isn't properly blocked, the popping will be even more severe.
Just bought a used track K7 GSXR 1000. I was making it street legal again and while going over the bike I noticed the aftermarket block off plates on the head. No idea what they where for. The bike has the exhaust O2 sensor port blocked as well. I'm guessing with knowledge bombs you so skillfully dropped in this vid this was done to accurately tune the bikes ECU? Is there any other was to verify that the bikes ECU has been modified? (there is no power commander installed, and no F1 light) Thank you so much for explaining the PAIR system!
The items you list are purely for emissions removal. The k7, are not highly restricted in the ECU and can be ECU tuned with a yosh clicker box. You should be fine. You would need to have your ECU read by an ECU tuner to know for certain.
@@BrockDavidson Right on thanks for the info!
on a bike with ram air it seems like some of the ram effect would be lost by air bleeding out through this port. Is that true or maybe not significant enough of an amount of pressure lost?
If it does, we don't have the ability to measure it.
Hey Brock. That's a great video but raises a question I don't know the answer to. Could you explain please.... Assuming an after-market exhaust is fitted to my bike and I block off the PAIR valve, but leave the O2 sensor in place - if the O2 sensor's input to the ECU is trying to keep the fuelling in a certain range based on its fuel map and the ECU is expecting the PAIR valve to be injecting air into the exhaust (and so I guess richening the mixture to compensate for the air being let in by the PAIR valve) , if you block the PAIR valve it would make sense that there will be less air in the exhaust so the exhaust gasses would appear richer than they really are. Does the ECU see this then lean back the mixture even more? If so, is the best option when blocking the PAIR valve to also eliminate the O2 sensor? Thanks Rich
The stock O2 sensor (narrow band) only knows if it's reading Rich or Lean and will adjust to 14.7-1 (in the cruising areas of the map) regardless if the PAIR is removed or in place. Note: If a PCV and map are installed with the stock O2 sensor in place, the ECM will continue to work in the same manner, disrupting the functioning of a known good PCV map. The O2 sensors and PAIR are only for emissions and must be removed for race use. The only exception to this would be bikes with Bosch ECU's which work more like a car to adjust fueling all of the time.
Thank you Brock.
Good explanation - succinct.
Question: when disconnecting the PAIR solenoid control connector is it safe to NOT terminate with a dummy load? Can it be an open circuit and the ECU won't mind or should it have a load as it would if connected??
Best
Some bikes will allow it, some won't. Even a flash just turns out the nuisance light in most cased.
@@BrockDavidson
Thanks for your reply!
Okay. Reason I ask, I did this on CB900F-5 (Honda 919) and they sent a 10k resistor in the HM090 blanking plug for the harness. (Can't flash a Honda ECU (well not that I'm aware of in UK))
HOWEVER, I hated the muffled sound, so I just put the PAIR back. (I use Akrapovičs with the baffle removed and they sound great)
One more question related - if one likes the snap-crackle-pop of the roll-off when PAIR installed, why not just remove the control solenoid (heaviest bit) and leave the hoses connected, via a "Y" (or a "T"), back to the airbox and just let the reed valves control the flow of air? (I think they are 14mm hoses on the CB900F).
Thanks for your reply!
@H Some older style bike work fine with a dummy resistor. You can remove the solenoid, but would have to confirm the external plumbing is configured so that the reeds continue to draw air from the airbox - if you want the pop.
So blocking the inlet to the valve from the airbox is all i need, no block off platses or resistor dummy? I want to autotune it
Plates only reduce weight. Once the system is disconnected from the airbox it can be replaced with plates to reduce clutter and save a few ounces...
did i get it right measuring exhaust gas emission on a stock bike will result ok but on a bike with blocked pair with stock parts measurement will show rich mixture ?
if thats the case what will the result be on a blocked pair valve with an aftermarket air filter and exhaust ?
Great one! Just wondering, does pair valve mod & flapper mod work on the bike with the stock exhaust? Or only for with aftermarket exhaust? Please let me know. Thank you.
The cat in the stock exhaust can get clogged if the pair is blocked. flapper mod does not care what exhaust is on the bike. That said, if your exhaust can't flow enough - defeating the mod will not gain any additional power.
Thanks for replying me. My honda stock exhaust has no cat. Will pair valve mod do any other harm?
Appreciate these...
yo... can you guys make some parts for the b1250? have most of my parts from Dale Walker, but stuff like wheels or master cylinders are hard to find.
hello i put a 750 engine into my gsr 600 after that engine broke down . the bike sparks but it backfires or misfires alot . please any help i have changed the downcoil, pulse generator but still misfiring