KB Article #3 - PAIR Removal
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Joined: Dec 2017
Posts: 179
From: Quincy Mass
What was the pair control valve used for?
My understanding is that Honda introduced the pair control valve to eliminate afterburn and backfiring on the original exhaust that came with the bike. Honda's techs designed this method for this purpose. So, there is no value in removing this pair control valve.
Let's look at why you are now having backfiring and afterburn. You've changed the exhaust system from the original (so it now has less back pressure), and so you are getting these issues of afterburn, etc. If you change the exhaust system, you must make the appropriate changes to the carb set-up.
The original pair control valve was done by HRC for the original exhaust system. In fact, the pair control valve aids in cooling the intake temperature, which would give you a more efficient performance.
One of the forum members, ACE VenTRa, wrote in about this a while back. You should check it out.
In the service manual, the pair control valve is under the topic of Exhaust Emission Control System, but it's main purpose was to stop backfiring. People putting block-off plates on the pair check valve are wasting their time and money. In my opinion, if you want to get rid of the backfiring, spend your time making the appropriate adjustments to the carburetors.
My understanding is that Honda introduced the pair control valve to eliminate afterburn and backfiring on the original exhaust that came with the bike. Honda's techs designed this method for this purpose. So, there is no value in removing this pair control valve.
Let's look at why you are now having backfiring and afterburn. You've changed the exhaust system from the original (so it now has less back pressure), and so you are getting these issues of afterburn, etc. If you change the exhaust system, you must make the appropriate changes to the carb set-up.
The original pair control valve was done by HRC for the original exhaust system. In fact, the pair control valve aids in cooling the intake temperature, which would give you a more efficient performance.
One of the forum members, ACE VenTRa, wrote in about this a while back. You should check it out.
In the service manual, the pair control valve is under the topic of Exhaust Emission Control System, but it's main purpose was to stop backfiring. People putting block-off plates on the pair check valve are wasting their time and money. In my opinion, if you want to get rid of the backfiring, spend your time making the appropriate adjustments to the carburetors.
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MotoGP
Joined: Jul 2007
Posts: 5,213
From: Gettysburg, Pa
What was the pair control valve used for?
My understanding is that Honda introduced the pair control valve to eliminate afterburn and backfiring on the original exhaust that came with the bike. Honda's techs designed this method for this purpose. So, there is no value in removing this pair control valve.
Let's look at why you are now having backfiring and afterburn. You've changed the exhaust system from the original (so it now has less back pressure), and so you are getting these issues of afterburn, etc. If you change the exhaust system, you must make the appropriate changes to the carb set-up.
The original pair control valve was done by HRC for the original exhaust system. In fact, the pair control valve aids in cooling the intake temperature, which would give you a more efficient performance.
One of the forum members, ACE VenTRa, wrote in about this a while back. You should check it out.
In the service manual, the pair control valve is under the topic of Exhaust Emission Control System, but it's main purpose was to stop backfiring. People putting block-off plates on the pair check valve are wasting their time and money. In my opinion, if you want to get rid of the backfiring, spend your time making the appropriate adjustments to the carburetors.
My understanding is that Honda introduced the pair control valve to eliminate afterburn and backfiring on the original exhaust that came with the bike. Honda's techs designed this method for this purpose. So, there is no value in removing this pair control valve.
Let's look at why you are now having backfiring and afterburn. You've changed the exhaust system from the original (so it now has less back pressure), and so you are getting these issues of afterburn, etc. If you change the exhaust system, you must make the appropriate changes to the carb set-up.
The original pair control valve was done by HRC for the original exhaust system. In fact, the pair control valve aids in cooling the intake temperature, which would give you a more efficient performance.
One of the forum members, ACE VenTRa, wrote in about this a while back. You should check it out.
In the service manual, the pair control valve is under the topic of Exhaust Emission Control System, but it's main purpose was to stop backfiring. People putting block-off plates on the pair check valve are wasting their time and money. In my opinion, if you want to get rid of the backfiring, spend your time making the appropriate adjustments to the carburetors.
Adrenalin Junkie
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Joined: Aug 2020
Posts: 123
From: Gulf Coast MS
PAIR is there to inject air to burn up unburned fuel in the exhaust system. It's an emissions related system. The value in removing it is simplicity during dis and re assembly and cutting down on decel popping. Air would get injected, lilting off unburnt fuel, hence the pop.
https://youtu.be/_xMykbzJWiQ
https://youtu.be/_xMykbzJWiQ
It's a weight saver as well once the air pump is removed from the system.
I've already done this on my VTR but have a lot to do to get it all back together again.
I look forward to riding it once more.
Senior Member
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Joined: Dec 2017
Posts: 179
From: Quincy Mass
Great Video.....BUT, the VTR 1000 does not have fuel injection or a mapping system to be concerned about....Just two BIG *** carburetors that have to be manually adjusted.
There is a great section on this in the forum that should be read.
There is a great section on this in the forum that should be read.
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