GSXR Pair Mod - Sportbike Addicts

***Cakes206*** · 05-18-2005, 08:48 PM

As most of you may know the crank case on a GSXR is vented through the air box. This is mainly for emissions control. The problem with venting the crank case into the air box is oil mist can/will travel into the air box, past the filter and into the air/fuel mixture, weakening the charge detonation. The Pair Mod bypasses the air box and vents though the exhaust. This will not only eliminate all chances of oil mist getting into and through the air box...but will also create negative pressure within the crank case...wich is always good for a pony or two...

This is how to do the pair mod on an 02 GSXR 750. The applications for the same generation 600 and 1K's is relatively the same.

Take off the tank. Take off the air box. Take off the hose that connects the crank case cover to the air box and cap off the opening left behind on the air box.

Pic 1 This is where the pair valve sits(removed in pic)
Pic 2 Size and part # of hose from Home Depot
Pic 3 "T" connector also from HD
Pic 4 Cap off the vacuume hose with a slightly larger screw. I don't recomend cutting the hose, just incase you want to turn it back to stock. You can see the hose comming out just by the #4 TB.
Pic 5 Crank case cover where hose connected to air box WAS.
Pic 6 Attach one end of NEW hose to crank case cover.
Pic 7 Connect other end to "T" connector...Your done.
Pic 8 Your end result should look like this...plain and simple. The clamps I had gotten were a tad to small so I used zip ties for now. But as tight as that hose is...it ain't goin nowhere...

DougZ · 05-26-2005, 03:39 PM

Joe, have you done this on the SV1K?? If so, is it basically the same procedure??

What do you think of "desnorkling"???

***Cakes206*** · 05-26-2005, 06:58 PM

Hey Doug, I haven't really been able to get down n dirty with the twins so to speak yet...I've only done this on my Gix when I had it.

JasonB · 06-02-2005, 04:00 PM

wait i dont get it :uh:

***Cakes206*** · 06-02-2005, 05:56 PM

Quote:

Originally Posted by Jase

wait i dont get it :uh:

What don't you get?

RacerGSX · 08-03-2005, 04:18 PM

Hey Joe is this MOD done the same way for a 04 GSXR 600? I have been looking but have not found anything on it.

Duff750 · 09-08-2007, 04:31 PM

NOTE: 3/8in fuel hose will NOT work... Went to home depot and they claimed the don't sell rubber hose, only vinyl hose. Went to Auto Zone and got some, and it turns out you need hose with a 3/8in hole, not 3/8 actual diameter of hose.

***Cakes206*** · 09-08-2007, 04:46 PM

Quote:

Originally Posted by Duff750

NOTE: 3/8in fuel hose will NOT work... Went to home depot and they claimed the don't sell rubber hose, only vinyl hose. Went to Auto Zone and got some, and it turns out you need hose with a 3/8in hole, not 3/8 actual diameter of hose.

Fuel hose? Air hose like for compressors was originally used. Home Depot might not carry it anymore as it was originally done 5 years ago. The pic showes 3/8" ID...Inner Diameter man

It is a tight fit though...just how I likes it

Duff750 · 09-08-2007, 04:47 PM

Yeah, I didn't know what ID meant, lol.

07gixxer750 · 10-31-2007, 07:57 PM

what about doing the mod on a bike newer than 05 that has a sensor hooked up 2 the pair valve? any sugestions? I tore my 07 750 apart and then realized that all the write ups are for bikes 05 and older. any help would greatly be appreciated.

High_Revs_17 · 10-31-2007, 09:00 PM

Providing the sensor's mounted in a similar location with the modified hosing I don't see why there should be any sensor trigger issues.

Quote:

Originally Posted by 07gixxer750

what about doing the mod on a bike newer than 05 that has a sensor hooked up 2 the pair valve? any sugestions? I tore my 07 750 apart and then realized that all the write ups are for bikes 05 and older. any help would greatly be appreciated.

CBRBob · 10-31-2007, 09:57 PM

Is it a sensor or is it a solenoid? On the Honda's, there is a solenoid valve that opens the air passage. On them you unplug it, remove the system and cap the airbox and 2 ports on the valve cover with rubber caps. I would assume the suzi would be the same.

07gixxer750 · 11-05-2007, 09:38 PM

So i had 2 find my own way 2 get it 2 work, so to speak. i used the same hoses from the pair valve, and put a 1/2" connector between the 2. As for the hose from the crank case to the air box, i eliminated the hose completely and put a breather on the crank case, and capped the hole in the air box. any questions pm me or email me at 07gixxer750@gmail.com

High_Revs_17 · 11-05-2007, 09:57 PM

Good move, can never go wrong with a crank case breather, they just need to be cleaned a few times a season, installed one on my bike and it worked great.

Quote:

Originally Posted by 07gixxer750

So i had 2 find my own way 2 get it 2 work, so to speak. i used the same hoses from the pair valve, and put a 1/2" connector between the 2. As for the hose from the crank case to the air box, i eliminated the hose completely and put a breather on the crank case, and capped the hole in the air box. any questions pm me or email me at 07gixxer750@gmail.com

CBRBob · 11-06-2007, 09:51 AM

Put the hose from the crankcase vent to the airbox back on. You want negative pressure in the engine as much as possible. You read about how 'improved crankcase design drops pumping losses'. All that means is they found a better way for the air to move from the underside of one piston to the other easier. If you make a vacuum in the crancase, there is less air for the bottom of the piston to push against, hence, less power lost, and no oil drool on the outside of the engine.

One trick you will find in dragracing is that they have several vacuum pumps on the crankcase to gain power. Keeping the hose to the airbox helps, there is nothing to be gained by removing it.

Leave the pair on a stock muffled bike. There is no performance gain by removing the pair. The only benefit is if you put an aftermarket exhaust on you will hear the popping on closed throttle decel, disabling it takes away the popping. Also if you have the bike dyno-tuned, it needs to be disabled.