Need help identifying anomalous part.

[Guest]

Well I messed up. Hoping you guys could help me out. I'm reassembling my Mikuni BS34 carbs, and I cannot figure out where this little black rubber (or plastic, can't tell) washer goes. I checked all through my disassembly photos, as well as BassCliff's epic walkthrough found here with no luck.

This pesky washer is the exact same size as the little brass washer that sits below the main jet. Here are two pics of the two washers side-by-side, and on top of each other. Here is a picture of it seated in in the main jet pillar (is that the right term?).

If you need any more info I'm happy to assist!

[chuck hahn]

It goes on top of the metal plug thats there to fill the hole they made during manufacturing. The washer sits between the plug and the bowl gasket and it holds the plug up in there once the bowl is out on. There are no rubber washers anywhere else in CVcarbs. There are the rubber plugs that go into the pilot jet holes though..be sure they are there also. The brass ones go on the main jet and it holds the needle jets in place as you tighten in the mains.

[FLATout?]

Yes! Thanks, Chuck! I didn't even know that plug was movable. I poked at it, and it came out. Should this be a part that is able to move freely? Should I thoroughly clean it/lube it?

[chuck hahn]

No..the hole was made so they could get their tooling in to drill or mill whatever they needed..which then required a plug. Its just a plug and nothing else. The washer presses against it when the bowl is put on to keep it in snug, basically to keep it from rattling around and keep the bores integrity Other than that its useless. Doesnt need lubed or anything.

[FLATout?]

Ok, great, good to know. Thanks for your help!

FLATout signing out.