Carb question

[Guest]

Will a 81 gs750 carb fit on my 80 gs850

[Crankthat]

If you have your carbs off your bike and go out and measure the inner diameter of intake and output bores I will check for you.
You may need to switch out a few of your jets.

[Crankthat]

Forgot to mention measure size of 850 carbs as opposed too 750 carbs.

[freelancesilver]

The carbs are still on the bike I have my old boots on engine side and they fit on them

[Crankthat]

Yes they will.
Check this out--1980-83 GS850 Carburetor Specs and Float Height Illustrations

From Basscliffs website.

[Crankthat]

The list shows the jet sizes you will need and the jet sizes installed on the 750 carbs.

What is wrong with the carbs on there now?

You will need to replace a few jets according to the chart.
Your recommended pilot screw settings are different also.
There is info for rebuilding your carbs on his site.
That will come in handy for pulling and replacing jets.
Some people use heat to help the process.
I have found that soaking the carbs for a short bit in carb dip helps in taking jets out for complete disassemble and proper dip.
Should help you as recommended that you check and rebuild carbs that are in need if the history on them is not known.
Saves you trouble down the road, or on the side of it.

[freelancesilver]

I broke the post for the fuel/air screw on number 4 carb it stays in there but don't seem to safe with the threads missing

[freelancesilver]

Is the fuel/air screw interchangeable on these

[JTGS850GL]

Both the 81 GS750 and the 80 GS850 used the same BS32SS carbs with the same size pressed in main air jet so they're a direct swap from a straight body standpoint. Some of the other jets (main jet, needle, needle jet and pilot) are a different size. You can swap out the body from the GS750 and replace all the jets and slide assembly from the damaged GS850 carb. All parts will swap straight out including the pilot screw. If you just need a replacement body, I have one of those. Just tell me which carb 1-4 from left to right (while sitting on the bike) is the damaged carb.