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.
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.
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 ??
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
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 ru-vid.comsAVJ4bgi8cs?si=kO5fUAl7T2Q43cSt
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?
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?
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?
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
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.
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 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.
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?
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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HLrtlLSEdRo.html
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!
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
@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.
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.
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.
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
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.
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
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.
