Hello,  I am a new forum member and just picked up a low mile 2006 F.  I have owned and ridden over 100 bikes and was looking for something cool to ride around the neighborhood.  I saw this on the side of the road, bought it because I wanted it AND it helped keep a family in their home for at least three more months.

I know it's politically incorrect to remove the emissions plumbing and devices from these bikes but once you get the crap removed and the bike PROPERLY tuned it should run better and not emit much more.  Riding the bike keeps the car off the road.

Looking for guidance on removing as much of the carb vacuum plumbing and PAIR system as possible.  Has anyone done the big time simplification on the F?

thanks

Removing emissions equipment will not make a lick of difference in how the bike runs. It is however a huge ego boost for fiddlers, and sometimes necessary in order to prep a race bike/perform certain suspension/bodywork mods.

Just curious- are you in California? I think that may be the only place that the emissions would be a problem.

Then again, I'm not from CA, so wouldn't really know.

Removing the PAIR system makes the metal around the exhaust valve run cooler on nearly every bike, and especially on aircooled bikes.  I like to get all the junk out of the way.  Who knows what block off plates fit the GS?

Also, who can explain what the extra valves do on the carb tops (the white plastic ones).

Thanks.

As soon as I recover from having my shiny new heart artery stent installed (last Monday) I'll do the clean up and simplification and post the how to.  Does anyone know if existing PAIR vlock off plates for another bike fit?  Thanks

AFAIK, The GS500 doesn't have a PAIR system. You may be mistaking the PCV outlet on top of the valve cover for a PAIR inlet. I'd advise against attempting to block it off.

With all due respect, sir,  I have been tinkering with this stuff for 45 years and I know a vacuum solenoid operated passive air injection system when I see one!  Thanks for trying to keep me out of trouble though.  I need all the help I can get.   

you are right the f models have a PAIR SYSTEM i have disconnected the hose on the PAIR SYSTEM by removing it completely and  the tee .The hose now comes directly from the vac pickup on the carburettor to the one way valve.I have not blanked off the ports below the exhaust yet am waiting till i need to remove exhaust system ,to make more room to get in there ,did this 5000 miles ago no difference in performance and removed another potential vacuum leak .Haven't removed other vac hoses as required to lift needle and slide as they are vacuum operated.Am going to fit another vacuum canister because i feel a slight hesitation between 6-7000 rpm in third gear only when i nail it ,small engines have less vacuum than larger engines even on constant velocity carburated engines.

There seems to be a need for someone to be able to explain accurately how the F model carbs work. The biggest question seems to be the function of the white plastic valves on the top of the carb.  These valves do NOT operate the slide.  A difference in pressure between the upper and lower chambers makes the slide operate, just like ALL CV carbs (do some reading on how CV carbs work).  The white valves MAY effect slide operation for emissions but vacuum applied to those valves is NOT what makes the slides rise.  My GUESS is that Suzuki had difficulty meeting the emission requirements and these valves lean out the mixture (drop the slides slightly) under certain conditions.  You can see the box Suzuki was probably in.  Late in development they could not meet the standards.  Add the white valves.  Woops, sometimes not enough vacuum.  Add the vac reservoir.  All still speculation on my part.  Has anyone ever disconnected and capped those valves.  The OTHER possibility is that the valves are actually a vacuum source like ported vacuum on an older car carb.


I will take a look at vacuum passages etc. while I have the carbs apart and I will post the function of these valves.

My mistake. It appears the newer bikes are equipped with a PAIR system. Sorry about the confusion/bad info.

easy test... take a temp tank and the air box off run the carbs see where vacuum comes from... and where it goes... disconnect what you can...

Quote from: burning1 on August 29, 2011, 10:26:22 AM
My mistake. It appears the newer bikes are equipped with a PAIR system. Sorry about the confusion/bad info.

No apology necessary!  Maybe with a few of us taking a close look at this we can clear up the uncertainty about the extra plumbing on the later bikes.