Pair mod - Chicagoland Sportbikes
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post #1 of 21 (permalink) Old 07-14-2011, 09:52 AM Thread Starter

 
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Pair mod

My friend has a 2K TL1000 and he was concerned about "backfiring" upon de-accel from around 7000rpm. The bike has 8900 miles and it is totally stock. I've heard and read that the pair mod kit would eliminate the problem.

A. Is there any harm doing this?
B. Blocking it off in the tube with a marble, really?
C. Have you done this to your bike? Any downside?

My understanding of the pair system is a solenoid controlled by the ECU that injects fresh air from the air box into the exhaust port of both cylinder heads. It helps to re-burn exhaust gases to aid in lower emissions.

The marble idea seems like the easiest way to do this. Please offer your pro's or con's either way.

Thank you for any advice you care to share!

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post #2 of 21 (permalink) Old 07-14-2011, 11:01 AM
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the valve is vacuum operated, if you disconnect the small vac line and cap it at the throttle body you will disable the PAIR valve
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post #3 of 21 (permalink) Old 07-14-2011, 11:11 AM Thread Starter

 
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Quote:
Originally Posted by elroy121 View Post
the valve is vacuum operated, if you disconnect the small vac line and cap it at the throttle body you will disable the PAIR valve
Help me a bit please. Do you mean leave the line off and cap the TB inlet?

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"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
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post #4 of 21 (permalink) Old 07-14-2011, 11:13 AM
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there is no harm in doing this, i dont recall there being a connection to the computer, there is a round metal valve attached to 1/2 in hoses, 1 to each head and one coming from the airbox, the marble solution plugs the airbox hose, my solution disables the valve, there are reed valved in the head to prevent the hot gas going backwards into the pair valve, if any of those valves wore out you may be getting fresh air in the exhaust causing the backfires, on gixxers ive seen folks remove the reeds and fill the passage in the valve cover with silicone
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post #5 of 21 (permalink) Old 07-14-2011, 11:17 AM
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Quote:
Originally Posted by butchf View Post
Help me a bit please. Do you mean leave the line off and cap the TB inlet?
there is a small vac line coming off the base of the throttle bodies, just like carbs have a line for the vacuum petcock, if you d/c it there would be a vacuum leak unless you cap the nipple on the TB or cut the line and shove a bb in it, once you do this there is no vacuum to the PAIR valve so it wont open and dump cold air into the exhaust port
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post #6 of 21 (permalink) Old 07-14-2011, 11:51 AM
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The pair valve only allows additional air into the exhaust stream off-throttle.

Disabling the valve causes no issue.

The valve is actuated by vaccum ... which if disconnected, needs to be plugged.


They sell PAIR block off plates so you can actually remove the valves as well.


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post #7 of 21 (permalink) Old 07-14-2011, 11:59 AM
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Read here ....

http://www.tlzone.net/forums/suzuki-...air-valve.html

Tom

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post #8 of 21 (permalink) Old 07-14-2011, 12:21 PM Thread Starter

 
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Quote:
Originally Posted by BLARNEY View Post
The pair valve only allows additional air into the exhaust stream off-throttle.

Disabling the valve causes no issue.

The valve is actuated by vaccum ... which if disconnected, needs to be plugged.


They sell PAIR block off plates so you can actually remove the valves as well.


Tom
Thanks Tom....
Looks like we should be able to just do the marble trick as a temporary test.

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

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post #9 of 21 (permalink) Old 07-14-2011, 12:29 PM Thread Starter

 
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found this too! interesting...http://www.gixxer.com/forums/showthread.php?t=255078

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

Ytrap #819, forever in my prayers.
Arch, this Bud is for you..
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post #10 of 21 (permalink) Old 07-14-2011, 12:51 PM
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Quote:
Originally Posted by butchf View Post
that info is for an 08 1000 and shows a PAIR valve made of plastic with an electrical connection, older ones are metal and rely on the high vacuum the engine creates on decel to open it, your TL will not have the electrical version, and i did the pair sucker mod ( one step further) to my 02 600 and never threw a code
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post #11 of 21 (permalink) Old 07-14-2011, 01:22 PM Thread Starter

 
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Quote:
Originally Posted by elroy121 View Post
that info is for an 08 1000 and shows a PAIR valve made of plastic with an electrical connection, older ones are metal and rely on the high vacuum the engine creates on decel to open it, your TL will not have the electrical version, and i did the pair sucker mod ( one step further) to my 02 600 and never threw a code
based upon what you said, the marble trick should be just fine then....?

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

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Arch, this Bud is for you..
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post #12 of 21 (permalink) Old 07-14-2011, 01:31 PM
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yes, that will stop air from passing through the valve no matter what, and you'll see if the backfiring stops
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post #13 of 21 (permalink) Old 07-14-2011, 01:43 PM Thread Starter

 
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thanks, that's what I needed to know.......so much conflicting info out there.....makes it hard to know the simplest path to start with .....

I don't mind doing this in stages, but the owner is a good friend and I would rather do too little than too much......baby steps

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

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Arch, this Bud is for you..
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post #14 of 21 (permalink) Old 07-14-2011, 01:44 PM Thread Starter

 
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oh, while I'm here.....are the valve adjustments real hard to do?

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

Ytrap #819, forever in my prayers.
Arch, this Bud is for you..
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post #15 of 21 (permalink) Old 07-14-2011, 02:29 PM
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THe TL has no idea if the pair valve is there.

As long as you keep the vacuum system closed you are good to go.

The marble prevents vacuum from opening the valve..... good.


Tom

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post #16 of 21 (permalink) Old 07-14-2011, 03:50 PM
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Quote:
Originally Posted by BLARNEY View Post
THe TL has no idea if the pair valve is there.

As long as you keep the vacuum system closed you are good to go.

The marble prevents vacuum from opening the valve..... good.


Tom
actually the marble ( large size for large hose) would keep the valve from drawing air from the airbox, no matter what position it is in, the small line that feeds vacuum to the valve can be blocked with a BB and that would stop its operation but if its seat were damaged and leaking it would still backfire

either way is fine
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post #17 of 21 (permalink) Old 07-14-2011, 04:20 PM
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post #18 of 21 (permalink) Old 07-14-2011, 05:03 PM
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Quote:
Originally Posted by butchf View Post
oh, while I'm here.....are the valve adjustments real hard to do?
its been a long time, but i think the hardest part is the rear cyl, and if you need to remove a cam the chains are not easy to deal with
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post #19 of 21 (permalink) Old 07-14-2011, 05:40 PM Thread Starter

 
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thanks guys....
I would have a beer now ,but jrock says to "lay off the booze".
so I'll listen for a bit..........

CCS race official
sold the track bike
too slow to ride

"Repairs end December 31. 2011."

OK, it was a tough day.....back open again!!!
Bring me your broken down machines.

Butch @ 630-777-0273

Ytrap #819, forever in my prayers.
Arch, this Bud is for you..
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post #20 of 21 (permalink) Old 07-18-2011, 11:20 AM
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I converted a 2nd Gen Injected SV motor to Carbs and put it in a 1st gen frame. The 2nd gen SV has those pair valves on each cyclinder head. They need to be capped off air tight on each cylinder head and the vacuum system needs to be completely closed off.

The valve clearance check is standard shim under bucket.

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post #21 of 21 (permalink) Old 07-18-2011, 11:34 AM
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http://www.bugmanweb.com/gsxr/gsxrindex.html

not sure if this will help? check it out. lots of suzuki info.
gl

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