Carb ID 1978 GS1000

[ljjeeper]

I bought the bike used and all the previous owner could say is that they are aftermarket carbs with a stage 3 jet kit. The bike is running rich.

They are marked mikuni kogyo.
On the left side of the bike the markings on the carb are
4-90
20

On the right side of the bike they are
b8

Both those markings are on the flange for the intake manifold.

I would like to know what kind of carbs they are so that i can get it jetted properly.

[7981GS]

If you post a picture or two, I am 100% certain that someone here will know exactly what they are.

Daniel

[SqDancerLynn1]

During that time period The VM29's were the performance carb to use Idetified by a large nut on the float bowl to access jet changes

[BassCliff]

Greetings and Salutations!!

Hi Mr. ljjeeper,

Yes, probably some kind of VM carb. Pictures would be nice. Otherwise look at my little website for general carb information and manuals.

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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

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Thank you for your indulgence,

BassCliff

[Octain]

Air box or pods?
Bet they're stockers!

[rustybronco]

1979 GS1000 (E)

carb#1 p/n 13201-49020

carb#2 p/n 13202-49020

carb#3 p/n 13203-49020

carb#4 p/n 13204-49020

It looks like those are stockers

[ljjeeper]

i will get pictures when i get home.

I recieved a text from the guy that sold it to me last night claiming that they are 50 mm mikuni. Then another one this morning correcting him self saying they are gs1100 carbs.

Air box or pods?
Bet they're stockers!

It has pods. And a 4 into 1 exhaust.

[SVSooke]

These are stock ones.



They look better after a through cleaning

[Agemax]

hey mr svsooke, i think you got your float bowls on wrong! lol

[hampshirehog]

hey mr svsooke, i think you got your float bowls on wrong! lol

Only 2 of 'em are wrong.......

(Bloody 'ell - you're eagle eyed Adrian).

[tkent02]

(Bloody 'ell - you're eagle eyed Adrian).

Any relation to Eddie the Eagle?

[SVSooke]

OK didn't notice that.A few screws and all will be right.

[hampshirehog]

Any relation to Eddie the Eagle?

He was as blind as a bat. And (seemingly) as daft as one too.

[ljjeeper]

These are stock ones.



They look better after a through cleaning

That looks exacly like them. Those are the vm29's?

What would be a good starting point on tuning for the 4-1 exhaust and the pods? Or is there something else that would cause it to run rich?

[hampshirehog]

That looks exacly like them. Those are the vm29's?

What would be a good starting point on tuning for the 4-1 exhaust and the pods? Or is there something else that would cause it to run rich?

No - they are standard VM26s. You need to strip them right down, clean them properly (there's cleaning and there's cleaning) and look at what jets you have in there already before doing anything else