1981 GS G Cafe Build

[Kenneth_G_Rogers]

So im going to have to split the carbs see if its a o-ring inside there that perished. Put it back together then have fun syncing the carbs again...

[Nessism]

What kind of carburetors are those? They are different from the 850 carbs used in the USA.

[Kenneth_G_Rogers]

What kind of carburetors are those? They are different from the 850 carbs used in the USA.

As far as I know its the original carbs mikuni carbs... my 79 gs750 also has the mikuni carbs. If not the original its the carbs i gotvwith the bike and they work... I put them on my 750 to check for leaks and well i found some leaks...idled great and reved clean... until it started *@%^$*@%^$*@%^$*@%^$ing out petrol.

[Kenneth_G_Rogers]

IMG_20230227_121708.jpg this is the carbs for the 850. Dont have a picture of the 750s carbs but almost identical

[Nessism]

Those carbs are assembled incorrectly. The air screw bosses are supposed to face the outside of the bike, not inside like shown.

Secondly, Suzuki GS carbs use a center feed fuel inlet, between carbs 2 and 3. The fuel feed as shown is like that of Kawasaki KZ carbs.

Do these carbs have both pilot air screws and pilot fuel screws? If so, they are GS carbs. If they are either air or fuel, but not both, then they are KZ carbs.

Oh, and those carbs use the tiny little fuel Tee's like KZ carbs. They are made from rubber coated zinc. You will need to get a new set, since there are no O-rings on them.

[Kenneth_G_Rogers]

Those carbs are assembled incorrectly. The air screw bosses are supposed to face the outside of the bike, not inside like shown.

Secondly, Suzuki GS carbs use a center feed fuel inlet, between carbs 2 and 3. The fuel feed as shown is like that of Kawasaki KZ carbs.

Do these carbs have both pilot air screws and pilot fuel screws? If so, they are GS carbs. If they are either air or fuel, but not both, then they are KZ carbs.

Oh, and those carbs use the tiny little fuel Tee's like KZ carbs. They are made from rubber coated zinc. You will need to get a new set, since there are no O-rings on them.

Carbs laying in the garage for now ill examine them on my next off day and add more pictures. Thanks alot for the information this will help alot for when i split them and order the parts. Those are the carbs i got with the bike. Like i said as assembled in the pictures they ran good idled smooth reved clean. Just the leak that came up... the carbs have been standing a solid few years. Thats why i thought maybe it could be a O-ring. Ill uplpad pictures when i split it.

[Kenneth_G_Rogers]

IMG-20230227-WA0003.jpg by the looks of it the carbs have been through a rough time

[Kenneth_G_Rogers]

IMG-20230227-WA0001.jpg all the screws have some bad wear and tear

[Nessism]

The photos show the fuel screw, but what about an air screw? Do the carbs have those too?

[Kenneth_G_Rogers]

I dont see a air screw on the carbs no. I am wondering what these are for. I havent seen it yet. My 750 also has them. Screenshot_20230314-150801.jpg

[Kenneth_G_Rogers]

And this is the inside Screenshot_20230314-150757.jpg

[Kenneth_G_Rogers]

The 750 amd the 850 are my first bikes with more than 1 cylinder.

[Rich82GS750TZ]

I dont see a air screw on the carbs no. I am wondering what these are for. I havent seen it yet. My 750 also has them. Screenshot_20230314-150801.jpg

Those ports are for carb syncing with a gauge. While this video doesn't exactly get the job done, Urban Monk give a good idea of how it's supposed to work.

go to 3:44 in the video:

I'm sure you can find better videos of how this works if you dig around youtube just a bit.

[Kenneth_G_Rogers]

So i finally got a quick moment to split the carbs and get the seal out This is what poped out on the other side the leaking side didnt have anything left. So when it comes to a replacement part. Do i get a o-ring or wont that work.

[Kenneth_G_Rogers]

Will that o ring go over this item or inside the carb. I havent opened the other side IMG_20230316_182953.jpg