Carb conundrum

[Savav2v1]

Apologies for long post, hope it makes sence, basically I'm checking valve clearance's on my GS1000, i noticed all the plugs are a light grey, although not done a plug chop my last ride was on track so was wondering if i needed to richen it up slightly so i checked main jet sizes

Cylinder 1 = 127.5

Cylinder 2 = 145

Cylinder 3= 127.5

Cylinder 4 =142.5

As i mentioned all plugs identical colour, bike starts on the button, crisp throttle response, very smooth from idle to redline, exhaust tip light grey, its only because I'll be doing more track time this year i was considering a richer mix but with all the different jet sizes maybe I'll leave it, any advice appriciated 

Cheers

 

[TonyGee]

them jets are all over the place !!!!!  generally the larger 2 jets are in carb 2 & 3  so they run slightly cooler.  what does the manual say the jets should be ?

[gs7_11]

Jet sizes should all be the same.....about 115 with stock airbox IIRC. Bigger if you've got no airbox of course.

Are those GS1000 carbs even? GS1000 has a cable operated choke.

[Savav2v1]

Sorry no manual, i never realised that the jets can be different sizes, and yes all over the place but running well

 

No your right, not standard carbs,and breathing pipercross airfilters, am hoping someone can tell me what there from

[Gixer1460]

That is a puzzle ! I've run different MJ's between 1/4 and 2/3 for reason mentioned above but only 4 points on the DJ jetting. Plug colour is difficult to monitor these days - porcelain colour is unrelable with unleaded fuels IMO - I go by the outer thread face . . . . . and it appears your 'weaker' jetted ones are richest ! ! ! Possibly someone has been in there and drilled out the jets so you can't depend on the numbers . . . . It may have been dyno'd with that as its corrected set-up, if its running good, I wouldn't touch it! 

Edited January 15, 2023 by Gixer1460

[cnap504]

Someone put those in for a reason but you have to wonder what was the reason.  If running without an air box put 140’s in all four, see how it runs and check the plugs.

[Savav2v1]

Thank you all for your great input and time,as mentioned above, as its running so well i shall leave it for now but i do have 4 x new 132.5 jets that i might fit just to see what happens,  i also now vaguely recall the previous owner saying he spent alot of time setting the carbs up, but shrugged it off as usual selling bike banter, but now i believe it could be true 

[ral]

I would be happy with the colour of them plugs, strange jetting set up I’ve not come across before, we live and learn, I would also confirm actual hole sizes as who knows if they’ve been drilled.

like you say though if it runs great why mess with it.

Deffo not std carbs though but would be interested to establish what they are off.

[Savav2v1]

7 hours ago, ral said:

Deffo not std carbs though but would be interested to establish what they are off.

Me to bud,still seaching, tend to end up going in circles though, thanks for your input 

[TonyGee]

12 minutes ago, Savav2v1 said:

Me to bud,still seaching, tend to end up going in circles though, thanks for your input 

they look like the same tops you get on the Z1000J ?  

[Fazz711]

Are all the jets the same make?

Think dyno jet  use different markings so ma have mix of jets

Edited January 15, 2023 by Fazz711
Fat fingers

[Savav2v1]

On 1/15/2023 at 7:39 PM, TonyGee said:

they look like the same tops you get on the Z1000J

Cheers fella, I'll have a search

 

On 1/15/2023 at 7:43 PM, Fazz711 said:

Are all the jets the same make?

Dunno bud, I'll check, cheers

[Savav2v1]

On 1/15/2023 at 7:39 PM, TonyGee said:

they look like the same tops you get on the Z1000J

Think your spot on, very similar if not the same as some up for aution on that site, thank you very much, very much appreciated