BST38 Float bowl drain screw o-ring?

[Crass]

There is a small o-ring with the Wemoto carb gasket kit for the BST38s that I can't match up to anything existing on the carbs. The only thing I can think it fits (which it does) is the float bowl drain screw but mine don't have any, nor does the parts fiche show one. Should an o-ring be present?

[Nick]

Never seen o rings on drain screws on thr float bowls.  You sure it isnt the vacuum port o ring for the top cap?  Or the mixture screw o ring?

[TonyGee]

if its tiny it'll be the mixture screws

[Crass]

Nope, it's neither of those. You get the pilot mixture screw o-ring in the pack, this isn't it. It's too thin to work as the o-ring on the carb cap sealing the carb balancing vacuum takeoff. The latter don't come with the set, I had to buy those separately.

See photo - the mystery o-ring at the top. Bottom left is a mixture screw o-ring (smaller) and bottom right is the o-ring for the cap.

Edited 5 hours ago by Crass

[TonyGee]

does the float valve seat pull out like a 1200 bandit 36's ? theirs an O ring round that

[Jaydee]

2 hours ago, Crass said:

There is a small o-ring with the Wemoto carb gasket kit for the BST38s that I can't match up to anything existing on the carbs. The only thing I can think it fits (which it does) is the float bowl drain screw but mine don't have any, nor does the parts fiche show one. Should an o-ring be present?

Hardly this o-ring location? (What TonyGee said)

Edited 5 hours ago by Jaydee

[Crass]

No, it's not that one it's too small and there's another o-ring supplied which fits the float bowl mounting stem.

I'm wondering whether perhaps this kit fits more than one bike / carb and as supplied for a GSXR750L there is an o-ring that is not used?