Lunchbox and Jetting, Quick questions!

[Jayke]

Well I'm going to be buying the jets in about an hour. I'm not educated at all on the whole carb situation. I'm just going by what you guys say! D:

Now I'm worried again lol!

I'm at right now, a
22.5 pilot
142.5 main
62.5 mid main

Which is what I'll be buying soon. So eh! Any last minute suggestions? On a bit of a budget right now and don't really wanna throw any away on wrong jets if I can help it

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[BockinBboy]

As far as I know, The Buddha would be able to tell you best as he has worked on the most GS500 carbs out of the active members on this forum... not sure of anyone in particular that would know more about UK carb/needles specifically. 

I am not discounting rado at all, as he likely has more experience than myself in his carbs for sure... only wanted to point out the different needles using different jetting - but details as to how, why, etc... my limited knowledge on them, I won't comment my thoughts toward it lol, I'll just accept I don't really know (YET!)

- Bboy

Edit: Overall, I'm suggesting the difference in your needles and motad might be great enough to use smaller jets than the U.S. versions of your setup using our needles and even less restrictive exhausts than motad. 

[Jayke]

 I'll drop Buddha a pm or something asking him if he could give his opinion. And well , i think I'll be getting the delkevic exhaust within 2-3 weeks so it'd only run rich (if so) for a week or so. Even so, I think it'll run a ton better regardless, as right now it's super lean.

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[Crasm]

Interesting. May be the same case with motad, maybe thats why it's running so lean now. It has the motad system on and it's never been jetted as far as I know.

I will try the suggested jets, which I'm just about to go and buy(hopefully) or order. Then see how it is. Once I've had the bike apart once, I'll be fine with tearing it down. This is my first time when I do it soon so yeah! :p

Just out of curiosity,  which delkevic system did you go for? I'm looking at the 350mm one as that's road legal. I tried finding a good video but there was only one!

With baffle in its quiet noise and personally i feel power restricted.
On the other hand with baffle removed the noise created is more than impressive and gasses are freer flowing. Delkavic with baffle removed IS a race system no restrictions at all.

I have the 350mm oval end can on there headers and keep the baffle out perminantly

[Jayke]

That's what I plan on doing I guess, I'm looking for a deeper and louder exhaust than my current motad.

Local shop had the jets but they were like £15 each. So I'll be ringing motorcarb tomorrow. Not sure what to go now. Hmm! Hopefully Buddha will come and shed light on the situation.

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[Crasm]

 ive been in talks with buddha myself over the last few days over the same thing.
He advised me to go 20/65/147.5 , 1 washer on jet and 3 turns out on air screws
Delkavic with out baffle is loud . Motad sounds like a standard exhausy compared to it
Honestly you will be impressed with the sound.

Im just waiting for my jets to arrive . Ive had to take off my lunch box and put airbox back on until  they arrive it was almost unrideable

[Jayke]

Oh right cool!!  What do you mean by a washer on it? Any certain kind of washer?

Can't wait, honestly lol!

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[Crasm]

According to buddha theres a washer above the needles e clip.
That washer needs to be put under the e clip unless the e clip is moveable and then
The clup can be moved 1 position.

He assures me its self explanitory when your looking at it.

Im in the same boat as you are but i already have the delkevic
And im in the uk and ive not took my carbs apart on this bike yet either lol

What year is your gs?? Mines an 05

[Jayke]

Oh right sounds alright I guess. It's scary isn't it! My gs is a 2001 model so first one I believe with the new carbs with the mid mains.

Only had the bike under a month, it came with the motad system on it, if it were my choice I would've gone for the delkevic

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[Crasm]

Ive had mine just about a year and had the exhaust around 9 months.
As for the carbs in doin the exact set up buddha has recommended and if its not right ill play with it and take it from there.
Ive also got ngk irridium plugs k and n high flow oil filter with castrol oil.

Once its set up im taking it for a dyno test . Theres one in a place called cradley heith in the west midlands which is not far from me as im in west bromwich 

[Jayke]

Ive had mine just about a year and had the exhaust around 9 months.
As for the carbs in doin the exact set up buddha has recommended and if its not right ill play with it and take it from there.
Ive also got ngk irridium plugs k and n high flow oil filter with castrol oil.

Once its set up im taking it for a dyno test . Theres one in a place called cradley heith in the west midlands which is not far from me as im in west bromwich 

Nice nice, just got in touch with motocarbs, he emailed back within like 5 minutes even at 8:30pm!

Almost the same setup as me then, I just have a stock oil filter in though, may upgrade at a later date, never know!

West Brom is about 35miles from me, just down the road heh! Hope you share the dyno results with us, though!   

[Crasm]

Yea motocarbs are really good . Is it steve your speaking to?

Ill defo put the power results up once ive had it done in about 2 or 3 weeks time hopefully

And yea with all the americans , canadians and aussies on here and you find some one kinda local to you on this tiny island called britain lol 

[Jayke]

Yea motocarbs are really good . Is it steve your speaking to?

Ill defo put the power results up once ive had it done in about 2 or 3 weeks time hopefully

And yea with all the americans , canadians and aussies on here and you find some one kinda local to you on this tiny island called britain lol 

Was very supirsed! Props to them and yes its Steve I'm talking to

Look forward to seeing them!

And yes! Very local, quite strange. :p

Off topic - Dont happen to know of any groups of riders and such near us, do you? I'd love to do group rides soon as I've never actually been on one before. 

[radodrill]

I am not discounting rado at all, as he likely has more experience than myself in his carbs for sure... only wanted to point out the different needles using different jetting - but details as to how, why, etc... my limited knowledge on them, I won't comment my thoughts toward it lol, I'll just accept I don't really know (YET!)

- Bboy

Edit: Overall, I'm suggesting the difference in your needles and motad might be great enough to use smaller jets than the U.S. versions of your setup using our needles and even less restrictive exhausts than motad. 

I had indeed touched on the fact that the UK spec bikes have different needles.  Based on the datasheet in the Suzuki service manual, there were 4 variants of the 01/02 GS for the EU market; 2 with a 115 main (one is the UK spec), 1 with a 130 main, and 1 with a 135 main.  From the needle part numbers (5DH42 for US with 130 main, 5DH41-2nd for EU/UK with 115 main, and 5DH41-3rd for EU with 130/135 main); it looks like the EU bikes have an adjustable needle with the e-clip at a different position for the 115 main.
I'm presuming the e-clip positions are counted from the bottom as this would make sense to have the needle higher to allow more fuel to be metered by the smaller jets during part throttle operation.  The other effect of the smaller main is that the max amount of fuel it can meter (slide all the way up) is less resulting in less power and lower emissions.

Regardless of what needles are actually in the carbs, it should be possible to raise/lower them as needed to tune the carbs for a smooth power curve across the whole RPM range.

You could even check if motocarb carries the 5DH42 needles that were used on all 01/02 GSes sold outside the EU and UK.

[Jayke]

Well I'm all out of money now I ordered the jets, so I guess I'll just have to wait! 
Have someone interested in my other bike so hopefully it will sell so I can get everything done soon

Thanks everyone for the input.

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[BockinBboy]

Thanks for that info rado. Also just realized I flubbed saying 115 pilot but meant mains or something off like that in a previous post- probably made it a little confusing what I meant but hopefully it got translated haha... Just seemed odd to me the stock jetting was so much smaller for UK model carb, cause if you put those UK size stock jets in US carbs, you'd be lean outta this world.

- Bboy

[radodrill]

Just seemed odd to me the stock jetting was so much smaller for UK model carb, cause if you put those UK size stock jets in US carbs, you'd be lean outta this world.

The carb bodies are the same for all variants of the 01+ GS

Stock jetting on the US model is already lean; the 115 is lean out of the world, but they've set up the needle to mask that and get decent behavior.

Notice how all variants with the 3-jet carbs come stock with a 17.5 pilot, this is so that you don't have trouble starting/idling the bike; the differences in the mains you'll really only notice out on the road or on a dyno.

Once you know (have experienced) what the bike can do when jetted correctly, you really wonder about the super lean factory settings and emissions laws.  Granted at idle it's using a bit more fuel, but under load you may be using equal or less fuel as you need less throttle to get the same power output.  Though most of us will be enjoying the additional power on tap and putting it to use

Edit: Jayke, when you open up your carbs, could you also take out the needles and post a pic of them with and without the plastic/metal washers (leave the e-clip on)?  This would be interesting to see the difference between the EU/UK and rest of the world needles.  That pic and one of the US needles would be good in the wiki as well and I may create a new thread with the carb jet tuning info (hopefully to be stickied) in case people don't see this thread.

[Jayke]

Yes I will do that for you. Step by step with my dslr just for you

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[radodrill]

Yes I will do that for you. Step by step with my dslr just for you

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Thank you very much.

I guess from my TLDR you can tell why the wiki says "Unfortunately Re-Jetting is a black art (so many variables including humidity, altitude, engine condition etc etc) so often much tweaking of jet sizes is needed to find the perfect combination;" at least with a sense of what each adjustment does you can get it right

[Jayke]

Yes I will do that for you. Step by step with my dslr just for you

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Thank you very much.

I guess from my TLDR you can tell why the wiki says "Unfortunately Re-Jetting is a black art (so many variables including humidity, altitude, engine condition etc etc) so often much tweaking of jet sizes is needed to find the perfect combination;" at least with a sense of what each adjustment does you can get it right

Yeah I see that - I will just start from these suggestions and go from there I suppose, guess my spark plugs are going to become my friends and I'll become a pro mechanic lol!