1977 GL 1000 carb top question

[maintainer]

Are the plastic cap "buttons" on top of the carbs important?
Can they be purchased anywhere?
I have a weathered and broken one.

[dingdong]

Yes they are important. The slides won't work properly if broken. Check this link for repair info. http://www.wingovations.com/carburettor ... 4579471075

Tom

[maintainer]

Yes they are important. The slides won't work properly if broken. Check this link for repair info. http://www.wingovations.com/carburettor ... 4579471075

Tom

Yes thanks, I did a little online research and found this about the GL 1000 on Steve Saunders Goldwing Facts:

A particular issue is the plastic buttons in the carburetor tops; these were built in to the top of the vacuum chamber during manufacture and cannot be replaced. They do tend to fail, and the usual fix is to epoxy something on top. A good seal is vital for proper vacuum operation

[spiralout]

Yes they are important. The slides won't work properly if broken. Check this link for repair info. http://www.wingovations.com/carburettor ... 4579471075

Tom

I was under the impression that those are just dress up caps to be placed over the old uglied up original caps, not a repair for broken ones.

[WingAdmin]

Yes they are important. The slides won't work properly if broken. Check this link for repair info. http://www.wingovations.com/carburettor ... 4579471075

Tom

I was under the impression that those are just dress up caps to be placed over the old uglied up original caps, not a repair for broken ones.

Correct - the Wingovations products in the link above are cosmetic only.

As far as I know the only place offering true replacements is Pistol Pete's, at http://www.oldwings.com - you have to send the carb tops to them for them to be installed, and the price is $25.00 each or $80.00 for four.

[dingdong]

Well, learned something new today. I thought those were repair tops. Sorry!

Tom

[sfruechte]

There doesn't seem to be any vacuum leak when a carb top is compromised. How does it impact vacuum or function?

[spiralout]

There doesn't seem to be any vacuum leak when a carb top is compromised. How does it impact vacuum or function?

When a cap button is compromised, you lose vacuum to the top of the slide, which is what causes them to rise. There's a passage in the button that transfers the vac from the bore to the underside of the cap. This is the best pic example I have on this PC

[ct1500]

There doesn't seem to be any vacuum leak when a carb top is compromised. How does it impact vacuum or function?

Carb slides only move or open with a sufficient carb venturi vacuum and not a manifold vacuum at idle below the throttle plates.

[SnoBrdr]

There doesn't seem to be any vacuum leak when a carb top is compromised. How does it impact vacuum or function?

When a cap button is compromised, you lose vacuum to the top of the slide, which is what causes them to rise. There's a passage in the button that transfers the vac from the bore to the underside of the cap. This is the best pic example I have on this PC

carb_c.jpg

So they just degrade over time, become brittle ad break?

I had to replace one 2 years ago.

[TKM51]

Good morning
I saw a rack a good while ago with Molson Canadian beer caps epoxied on . The fellow said it was his fix for a broken button ,said they worked well and looked good---I am sure other caps would also do the trick
Terry

[RBGERSON]

You have to be careful there is a vacuum/air hole at the edge of the cap that must remain open