Question about rejetting, K&N RU-2970, my left cylinder not firing.

[The Jedi]

Ok Here is a picture first.
http://i.imgur.com/wBNV9PH.jpg

My first question is about what i think is called the 2nd air valve assembly. I only know that from looking up the part. I'm not familiar with the part itself. Anyway normally it would have a hose connecting it to the air box. But the PO did away with all that. Does it matter that the orifice is open like that?

2:Same question as up top but for the black tube in the center.

3: the black Tee connecting the carbs right above the air filter. Part of the tee is open. Is that bad?

4: I read somewhere a rejet is required if you are running with this filter. Is there a way to know if the PO did the rejet?

5: I don't think my left cylinder is firing. I know it gets a spark. But the reason i have doubts is because I can pull the plug wire off the left plug start the bike up and it runs just as fine as it ever has. which also makes me wonder if i have been riding it like this for a while. Anyway if i leave it running with only the right side spark plug connected and connect the left spark plug nothing happens. The idle rpms dont change or anything.

If I connect the left plug and disconnect the right plug the bike wont run. Well it will run but only if I keep on the throttle.  Is that normal? I wouldn't even have noticed but I was changing the exhaust back to stock from what the PO had installed. Well i started the bike and noticed the left side exhaust coming out of the engine wasn't hot compared to the right side.

Thanks for your help. This is my first bike. Pardon my ignorance.

2007 gs500f

[radodrill]

1) Not sure; I haven't removed the PAIR system on my 2009 GS.  Normally the pair will draw fresh air from the box and inject it in the exhaust manifold so that any uncombusted fuel has oxygen to burn resulting in lower emissions.

2) that vents vapors from the top end of the engine and should be near the air intake so they can be drawn in the engine.

3) that is a vent from the carbs.  From the factory there is a tube that goes over the airbox and ends near the battery tray (open to the atmosphere).

4) rejets are particularly helpful with free flowing filters and exhausts.  Probably the easiest way to check is to open the float bowls and look at the jets.  The jets will have the size stamped on them; stock is 17.5/60/130.

5) possibly the carbs need cleaned or they may not be jetted correctly so they aren't metering enough fuel.  Also be sure to check that the plugs themselves are good.

[The Jedi]

Anywhere I look for jets they are only referred to as stage 1 stage 2 etc. Is there somewhere specific users of this forum get there jets?

Also I am not sure which rebuild kit I need. Could you tell me if this is the correct one? I know if it is I Will need 2.

http://www.ebay.com/itm/NEW-SUZUKI-CARBURETOR-REPAIR-KIT-GS500-GS-500-2004-2006-/360627178707?pt=Motorcycles_Parts_Accessories&hash=item53f70e0cd3&vxp=mtr

Thanks.

TJ

[The Buddha]

That kit is the last thing you need.
RU2970 is lunch box. you are running the stock pipe ?
It probably was rejetted unless it would run like crap. How does it run.

Cool.
Buddha.

[The Jedi]

Yes stock pipe. Well It seems to run fine but being my first bike if it wasn't running right i'm not sure I would notice. and like I mentioned above my left cylinder doesn't seem to be firing. The plugs are new. They both produce a spark. Other than that I don't know what else to check. I don't mind getting my hands dirty I just need a little guidance on what to do.

As far as the rejetting goes how crappy would it run? Only reason I have to be skeptical if it was rejetted is mostly just because I don't trust people to do things right. I could imagine someone wanting to throw a new filter on all willy nilly thinking it will add some insane amount of  hp without actually following up with the important part of rejetting.

Thanks

TJ

[The Jedi]

Ok I fixed the left cylinder issue. It was either a clogged jet or an open vacuum port.

It was rejetted. The current jet specs are 22.5/65/147.5

I have a picture showing the washers that are being used. and showing the vacuum port that was open.

http://imgur.com/a/SmF9O

Here are 2 pictures of the exhaust the PO installed. maybe you guys can tell me if it is any good. Yes that is a crack

http://imgur.com/a/5Gex4

Thanks
TJ

[The Buddha]

Oh yea that cap missing= bad. Wont run on that cyl, cos it sucking outside air via that hole and as we all know, just air wont burn, else we're all dead.
That exhaust - I do t see a crack, the pic was too small, but that looks like someone slapped a ricer car can on the GS header. Fugly, but that is no stock ppipe, prolly flows more than the V&H or yoshi for a bike.

And 22.5, 65, 147.5 may be the perfect jetting for that WFO can and your K&N .. you should be golden, or is that dark choclatey ... either way, fix that little cap, and enjoy, and report other issues. You are in the ball park, we can finesse it from here.

Cool.
Buddha.

[The Jedi]

Well that is the exhaust the PO installed. I removed it and installed a factory one for the time being. Do you think I should put the old one back on? I did fix the cap and that cylinder runs better now.

Whats the process for adjusting pilot air screws? Right now one of them is at 5 out and the other is at 2 1/2. Thats not my doing.

Thanks
TJ

[The Buddha]

Well that is the exhaust the PO installed. I removed it and installed a factory one for the time being. Do you think I should put the old one back on? I did fix the cap and that cylinder runs better now.

Whats the process for adjusting pilot air screws? Right now one of them is at 5 out and the other is at 2 1/2. Thats not my doing.

Thanks
TJ

Your jetting needs a WFO can and the K&N. I'd go to that pipe.
You can just turn the screws in, I'd set em both equal, they tried to compensate for a vacuul port being open by opening the air screws ... another turn or 2 and it have fallen out while riding.
Cool.
Buddha.