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Main Area => General GS500 Discussion => Topic started by: anoopb on April 04, 2013, 10:56:21 PM

Title: K&N Lunchbox with stock exhaust
Post by: anoopb on April 04, 2013, 10:56:21 PM
I was contemplating putting a lunchbox on my GS but leaving the stock exhaust in place.

has anyone done this?

The advantages are obviously better performance and a faster bike. Does it sound better with a lunchbox? I know my car used to make a kickass whirring sound with a k&n filter and a CAI.

As far as the carbs, I'm reading that I have to have it rejetted. Saying as I can take my bike apart now and take the carbs off, i'm wondering how hard the rejetting process is. Is it as simple as replacing the pilot and main jet and adjusting the pilot mixture screws?

What size jets are recommended for this setup?

Also, i'm thinking about painting my stock exhaust and making it all black. I read that grill paint was fairly durable. Anyone have any experience with it?
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:23:26 PM
I painted my exhaust black with the HRT paint?
Worked a treat.
Title: Re: K&N Lunchbox with stock exhaust
Post by: anoopb on April 04, 2013, 11:24:02 PM
Quote from: codajastal on April 04, 2013, 11:23:26 PM
I painted my exhaust black with the HRT paint?
Worked a treat.
what's HRT paint? pics?

btw. your avatar is really bizarre looking. it's freaks me out.
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:25:55 PM
Sorry I meant VHT paint doh!!
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:27:34 PM
My avatar is a pic of me that Yama modified



(http://www.nfauto.co.uk/images/march/exhaust_paint%20_cans.jpg)
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:29:40 PM
Heres a photo of my Black GS with the can painted with VHT Black

(http://m.ak.fbcdn.net/sphotos-c.ak/hphotos-ak-ash3/575904_10150913348743596_1160633391_n.jpg)
Title: Re: K&N Lunchbox with stock exhaust
Post by: anoopb on April 04, 2013, 11:33:05 PM
looks like it has a bit of a shine to it...

i was thinking of going matte black.

did you just paint the can or the whole things including headers?

did you take the chrome piece off or just paint over that as well?
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:44:00 PM
The paint comes in Matte Black as well as many other colours
I painted the headers as well as the exhaust.
Paint straight over chrome as they are there to deflect heat so should not be removed.
Title: Re: K&N Lunchbox with stock exhaust
Post by: codajastal on April 04, 2013, 11:45:31 PM


I painted over the matte black with high gloss that is why the shine
Title: Re: K&N Lunchbox with stock exhaust
Post by: weedahoe on April 05, 2013, 07:32:52 AM
I ran with with lunchbox and stock exh with stock jets for a long time
Title: Re: K&N Lunchbox with stock exhaust
Post by: PatheticPuma on April 05, 2013, 07:50:35 AM
Rejetting is simple. Pull carbs, remove float bowls, inspect o-rings and replace if necessary, unscrew old jets, insert new jets, replace o-ring and attach float bowls.

After that you need to remove the brass plug to get access to the mixture screws. There is a chart on the wiki with suggested turns.
Title: Re: K&N Lunchbox with stock exhaust
Post by: anoopb on April 05, 2013, 08:37:23 AM
Quote from: weedahoe on April 05, 2013, 07:32:52 AM
I ran with with lunchbox and stock exh with stock jets for a long time

Thanks weeds. Did you rejet with the new exhaust then?

If I don't need to rejet, then that makes the lunchbox decision even easier.

Title: Re: K&N Lunchbox with stock exhaust
Post by: anoopb on April 05, 2013, 06:19:56 PM
Quote from: PatheticPuma on April 05, 2013, 07:50:35 AM
Rejetting is simple. Pull carbs, remove float bowls, inspect o-rings and replace if necessary, unscrew old jets, insert new jets, replace o-ring and attach float bowls.

After that you need to remove the brass plug to get access to the mixture screws. There is a chart on the wiki with suggested turns.
Oh i'm not worried about rejetting. I'm wondering what size jets i would need. Fortunately, the pilot mixture screws are already accessible.
Title: Re: K&N Lunchbox with stock exhaust
Post by: mr. happy on April 05, 2013, 07:41:02 PM
Definitely a change in sound, especially when under load.  THe engine can finally breath.

I also got a 14 inch drill bit and drilled through the first plate in the stock can.  It opened the exhaust up a teensy bit,  made a noticeable difference.  Not huge, but noticeable.

I've got dynojet 128 mains, and the rest of the dynojet guts in mine. 
Title: Re: K&N Lunchbox with stock exhaust
Post by: weedahoe on April 05, 2013, 08:54:14 PM
Quote from: anoopb on April 05, 2013, 08:37:23 AM
Quote from: weedahoe on April 05, 2013, 07:32:52 AM
I ran with with lunchbox and stock exh with stock jets for a long time

Thanks weeds. Did you rejet with the new exhaust then?

If I don't need to rejet, then that makes the lunchbox decision even easier.

I did not actually. I only rejetted later because I wanted a bit more power and it made sense to do it sense I had made other changes.
Title: Re: K&N Lunchbox with stock exhaust
Post by: anoopb on April 05, 2013, 11:50:47 PM
Thanks Weeds.

so if i wanted to rejet after installing the lunchbox, how do i go about figuring out what size jets i need?

i'm assuming that performance is better even without a rejet?

does it sound different with a lot more air going in?

did you get a breather valve too like the wiki?

http://wiki.gstwins.com/index.php?n=Upgrades.AirFilter