Silverbird2

This actually turned out to be one of the better PAIR threads

Here's one that i have not heard before: This seems to be a popular set of questions over here at Graves Motorsports. Most people tell me “they don’t make any horsepower so why should I spend the $35 and take the time to install them”. Here is a quick but complete explanation on the benefits of using the pair valve block off plates on just about every model motorcycle. *This is for off road racing applications and not meant to be used on the street. If you have something to add please feel free. From the factory most motorcycles will come with a pair valve system on them. This is basically an air pump that pulls fresh air from your air box and through a bunch of hoses and fittings it pumps that fresh air into your exhaust ports on your cylinder head and sends it through your exhaust There is unburned fuel that makes it through the combustion stroke, exits the cylinder head, and makes its way down the exhaust system to finally exit into the atmosphere. The pair valve system adds fresh O2 to the exhaust so that as the unburned fuel come into contact with the extremely hot catalytic converter, the additional fresh air will cool the exhaust and aerate the fuel for a more efficient burn. This equals less emissions being released. Plus the additional O2 in the exhaust the lower the emissions reading. I have heard a number of reasons this is done but I will stick with the basic theories that I am aware of. (1) This requires a catalytic converter to really complete its job. Once you have installed a full race system and have removed the cat, all this fresh air will do it create the popping and back firing that throws those incredibly cool but damaging flames out of your exhaust .Great for night riding, but terrible for tail sections and leg hairs. To eliminate this add the smog block off plates. (2) If you decide to have your bike dyno tuned then you cannot run the pair valve system because as it adds oxygen to the exhaust. The dyno “sniffer” is picking up false readings from the additional O2 added after combustion. When it reads the extra O2 it thinks the bike is running lean and will compensate by adding fuel to the fuel map. Now you have a map that is much fat (too much fuel) and the bike will run terrible. The person that is tuning the bike will have to pinch these off every time you dyno the bike. To eliminate this add the smog block off plates. (3) The tubes, pump, and wires that are included in the pair valve smog system add unnecessary clutter and weight to the motorcycle. To eliminate this add the smog block off plates. (4) This is the last reason I have found to run the plates but it is NOT A FACT. It seems only I have noticed this and nobody has proven it right or wrong so do not take this as absolute. It could very well be just by brain acting up. I believe I felt it help my engine breaking a little. Before I installed them I felt like the bike (08 R6) had a really strong engine breaking and would pop and back fire a lot on de-acceleration. When I installed the plates I would swear that the engine breaking became more suitable. It was not as abrupt and not nearly as strong. Again this was only a guess and has no proof to it, however I did talk amongst a few tech savvy buddies and we worked out a somewhat scientific theory. Possibly as the hot engine gases are pouring smoothly out of the cylinder head like melted butter this cold fresh oxygen is forced into the exhaust ports. This could very well slow those gases down and create more back pressure which in theory could possibly cause stronger engine breaking. So…..maybe Im not crazy.

Damn that sucks! Sorry to hear that i just finished doing the pair valve removal also. I will look around and see if i can find something that will help on the net. I think i remember seeing something that helps get broken bolts out.

Very interesting, I am glad i asked.

That's not part of the PAIR system, that's just a vent for the valve cover. Hook it back up. It's purpose is to remove any gasoline fumes that get by the valves/etc from the oil, to keep your oil from thinning out. I realize that it is not part of the PAIR system but i read where some people said to hook it back and some said don't. By the way Hobie thank for the prompt responce and delivery of the block off plates. I got them much faster than i had expected. Anyone needing a set Hobie is your man. Painless transaction. :icon_thumbsup:

Okay, I know that this has been done to death but I have searched and read different opinions on how this should be done. I have mine apart and plates on. I have all the unTT-necessary plumbing remove and the stub in the airbox plugged. The question is what to do with the one going from the top of the valve cover to the airbox? Remove and plug, re-route and plug airbox, or hook it back up?

On the other end of the hose connected to the PAIR valve. Thanks

According to Warchild - Pre 2001 Platinum - CR9EHVX-9 Iridiums - Pre-2001: NGK CR9EHIX-9. 2001-2002: NGK IMR9A-9H. 2003: NGK IMR9C-9H. Also HERE Thanks, that is what i read as well. I thought it was the NGK CR9EHIX-9 but as you said it is the NGK IMR9A-9H. I don't know the difference but that is what i am going with. Appriciate the help

I agree, I put those in about 10K ago as they were given to me from a former owner, at that point I had over 50K on the set that came with my Bird, swapped them out because I had them but saw no ill effects from the plugs and they looked great (the old ones) when I threw them out. Thanks, for the help

Really? No one knows what spark plug?

Tell him your weight, planned use of the bike (sport riding, touring, combo, ect...) and an honest assessment of your skill level- as in how hard you'll be pushing it. IIRC correctly, you're the guy who walked around the outside of me at OzarXX last year like I was standing still, so I'd say go with "aggressive". Questions you should ask him- anything you want to know. You're paying him and he knows considerably more about suspension than anyone here. Thanks man, and I have no idea what you are talking about . Hope to see you there again this year

I am about to change my plugs. Which plugs do you run? I saw somewhere that NGK CR9EHIX-9 was the one. Anyone agree or disagree?

I am getting ready to send my front forks off to Dan Kyle to be reworked. I have been reading a lot of the old suspension post but still know relatively little about the inner workings. I am not looking for an explanation but would however like to know what i should be asking him and what i should be telling him i want. He is wanting to put in Ohlins springs and that is about all i know at this point.

I have them. http://www.cyclefarkle.com PM sent

So on a fuel injected bike where should i look for the vacuum supply that is shown connected together on the carbs?

I tried to contact the guy on the website above and the site is temporarily down. I will keep trying, in the mean time does anyone know another place to get a set? i have the bike apart to do some suspension mods and would love to take care of this while i have it broken down. Thanks ahead of time for any help i can get.

Let me know what you go with and how you like it. i have been looking also.

NICE find!

I bought mine from More Power Racing.com for 840, that was the cheaptest price I seen, also with free shipping, then I sent it back to ohlins in NC for an upgrade. They changed out the shock body, re sprung it, and made it ride height adjustable for another 230 bucks. So for 1070 I have a FULLY adjustable ohlins. And for another 2300 dollars call dan kyle up and you can get some ohlins fully adjustable R&T forks! Just checked MPR and they are asking $920.00.

I bought mine from More Power Racing.com for 840, that was the cheaptest price I seen, also with free shipping, then I sent it back to ohlins in NC for an upgrade. They changed out the shock body, re sprung it, and made it ride height adjustable for another 230 bucks. So for 1070 I have a FULLY adjustable ohlins. And for another 2300 dollars call dan kyle up and you can get some ohlins fully adjustable R&T forks! I was actually thinking of sending the forks to DK. I don't think 2300.00 is going to be spent on them but i feel after talking to him he will get me where i want to be with them. He is not a big race tech fan.

They are great for framing. I am not sure how you are going to use it to install a drop ceiling?

They do have some nice looking hardware

where to get one that is resonably priced (I know there is no such thing, you know what i mean). It is time to do the suspension on mine. The front is worn out and i need to do them both.

What did you make of the post that i was talking about?

I will try later today if i get time