I just ordered the parts to do the same thing to my bike, lunchbox, re-jet but keep stock can.  Getting a 44-t rear spkt too, already dropped a tooth in the front.  Hopefully within a couple weeks I"ll have everything in (ordered main jets from 140-147.5, just so I've got some room to tweak) and I'll be able to contribute.  Was glad to hear that you do get a performance gain without having to shell out for the exhaust!!

By the way, did you get this done?  How is it running??

I have a Cobra F1 exhaust the previous owner welded on ... the bike runs great (faster than any other 500cc'ers i've been around ... more acceleration than many stock 600cc'ers I've ridden with) . Should I assume they've rejetted ? It still has the stock airbox and i'm looking at the K&N filter , just not sure if I have to rejet . Keep in mind , i'm terrified of working on the carbs (never even worked on car carbs even) .... if it didn't HAVE to be rejetted with the new exhaust , how bad would it be to just try putting the K&N on ?
Anbother question ... in a previous thread , someone said that the K&N's just slip on in place of the boot to the airbox ... are the K&N filters the same as a "Lunchbox" I've seen referred to around here ?

Sorry to hijack , it just seems that the "people in the know" are responding here , and the info may be pertinant to your issues too 

^^

Quote from: smoker on April 29, 2007, 08:00:00 PM
By the way, did you get this done?  How is it running??

Actually, I just got the 140s the other day and haven't had time to swap the 147.5s out.  I'm also getting a used V&H exhaust in soon, so I'll have that to add on as well. 

I think I'll go ahead and rejet before I install the new exhaust, if for no other reason than to see what it would have been like had I not bought the exhaust.  Maybe in the next couple days I'll get the chance to swap the jets.  I'll let you folks know...

Yea, I'd like to hear the results too.  I want to pick up a lunchbox (not even for power, just so that I never have to wrestle the stock airbox back into position again) but uncertainty about the proper jetting w/ stock exhaust has kept me from doing it.

Does The New Airbox Increase Better Sound .. Eg I No With A Skyline , U Can Hear It Growling And Sucking In The Air... Im Sure Ive Just Answered My Own Question ....

Jay

Quote from: Jay_wolf on May 01, 2007, 05:06:20 PM
Does The New Airbox Increase Better Sound .. Eg I No With A Skyline , U Can Hear It Growling And Sucking In The Air... Im Sure Ive Just Answered My Own Question ....

Jay

Yeah, there is quite a bit of intake noise with the K&N Lunchbox.  It actually sounds really good IMO.

-Turd.

Any of you guys get this set up with the stock can since the thread started? How do the plugs look? Bike run good?

J

%%

Ok, I switched out the jets the other night and went for a ride.  Other than having to reset the idle speed, I didn't really notice much of a difference.  I'm pretty sure this is because it was only a short ride and I don't think it got fully warmed up.  I'll take it out again soon and see what happens.  Also, I might have to fool with the air mixture screws since I changed them while I had the carbs off (looking back, I should've just let them be). 

As far as the sound after removing the airbox - I think Turd and Wrecent both handled that question.  When I first revved her up after installing the Lunchbox, the snarl surprised the hell outta me and I couldn't keep from grinning like an idiot every time I twisted the throttle that week...

I'll report back once I have a better feel for the way the bike runs with the smaller jets and a proper setup.  Stay tuned

any one think there would be a benefit to an air feed system on the GS???  Dunno maybe something cannibalized off of a SRAD GSXR

Hey Wrecent,
What part of maryland are you in? If i was to meet you somewhere, could you walk me through the process of rejetting and replacing the lunchbox? (Also the best place to get it?) I am not mechanically inclined, and help never hurts
Thanks,
Chico 

Hey Guys,

So the last few weeks I started looking into the Lunchbox. After researching, I've decided to post various Jet setups from different members of the board. As far as I know all of the configurations below use a stock exhause with the exception of Galahs.

STOCK Airfilter
--------------------
Stock: 17.5/60/130

Meaning: main=130, mid=60, and pilot=17.5


K&N LUNCHBOX Airfilter
--------------------
Wiki: 20/62.5/142.5
Alphafire: 20/65/140 -- 22.5/65/137.5 (new)
LimaXray: 20/62.5/137.5
Turd Furguson: 22.5/65/140
Galahs: 20/65/145 (Jardine Exhaust)


Let me know if anything needs to be changed or is incorrect... Hopefully this helps someone in the future... hah


JG

^^

Quote from: badguy on May 03, 2007, 10:00:24 AM
Ok, I switched out the jets the other night and went for a ride.  Other than having to reset the idle speed, I didn't really notice much of a difference.  I'm pretty sure this is because it was only a short ride and I don't think it got fully warmed up.  I'll take it out again soon and see what happens.  Also, I might have to fool with the air mixture screws since I changed them while I had the carbs off (looking back, I should've just let them be). 

As far as the sound after removing the airbox - I think Turd and Wrecent both handled that question.  When I first revved her up after installing the Lunchbox, the snarl surprised the hell outta me and I couldn't keep from grinning like an idiot every time I twisted the throttle that week...

I'll report back once I have a better feel for the way the bike runs with the smaller jets and a proper setup.  Stay tuned

I'm looking to do the same thing and I'd be interested to know how it turned out 

Thanks

Ok, update:

I tried a plug chop a couple days ago, and found out that the 140s are a little lean.  At the time, i had the two washers on the needles, air mixture screws 2 3/4 turns out, and of course the 40/140 jets with lunchbox and stock (drilled) exhaust.  It definitely FELT good, nice power, pretty smooth (except for the transition between no throttle and cracked open just a little...that's still kinda abrupt).  however, I don't want to be overheating the bike. 

After I got back, I put my V&H exhaust on...I felt defeated - I thought the 140 would be perfect and that I had it really close.  I wanted to get the setup right for the stock exhaust, if for nothing else but GStwin posterity, but I realized that once I got it dialed in for the stock exhaust, I'd have to do it all over for the new one.  I wasn't really looking forward to that.  Sorry to all the folks that might have been looking to this thread for advice on setup, but if I had to guess, I'd say that 142.5s would be good to start out with. 

In case anyone cares, I'm gonna try 142.5s with the V&H and see what happens (they're the size most readily available to me at the moment).  Once I get it set up, I'll post in the rejetting thread.

Good luck folks!