Carburetors question

[andorragl]

Hello,
I am rebuilding my carburetors and I have some doubts. The # 4 carburetor hole is plugged, the other three are open. It is normal?
Looking from the other side it seems that it has always been like this, but it seems strange to me that it is blocked. I have seen many posts and many manuals on carburetors and it is something that nobody had mentioned.

[andorragl]

I carefully put a toothpick through the hole and almost loosely opened it. I would say this has always been blocked. Lighting from the other side is seen as if it was badly stamped. Is it possible this has been like this for 42 years? Will this motorcycle have ever worked 100% fine?
It's incredible!!!
I would appreciate any comment.
Here you are some pics.

[scootsx2]

Hmmm. Interesting. I suppose the hole may have become plugged over the course of time. I'm surprised one of the carburetor gurus on the board hasn't responded.

[robin1731]

There should be no through holes there. The only one that was correct is now bad too. If you look at the piece you knocked out it made of the same material as the carb bodies. If you look in the carb throat you can see the casting going to that spot.

Why is it there? Maybe a hole used for indexing when machining the carbs. But it was plugged when it was cast. Should be now.

.

[salukispeed]

I believe That hole is not tied to any fuel or air passages except the aircleaner side of the carb throat and is sealed off by the bowl gasket so would have no effect open or closed. Any vacuum would be only air filter restriction and not important. It is not uncommon to see such things in Zinc Castings like these. .

[robin1731]

That is a big hole. If it didn't matter I doubt Honda would have gone to the trouble to cast it with the plug in it. I wouldn't trust the gasket to seal that big of a hole. Your bike, do as you see fit.

.

[delling3]

I would expect that judicious use of some JB Weld or PC-7 epoxy could fill those holes. That way there wouldn't be any question about the gasket sealing it or not?

[andorragl]

There should be no through holes there. The only one that was correct is now bad too.

I had certainly thought about it

If you look at the piece you knocked out it made of the same material as the carb bodies.

Yes, is the same

But, in fact, the carburetor 4 was the one that worked worse, in the cold start without choke the cylinder 4 did not burn, instead with the choke or with engine hot, yes. The other three burned good in all conditions.
Other thing, The gasket have a hole there, the bowl is marked but closed.
I'm still un doubt. It would be nice to see a picture of a carburetor in good condition.
Thank you very much for your comments.

[robin1731]

I don't have any pics but I've seen a few GL1000 carbs.

.

[AussieGold]

here is the best pic i could find of a dismantled carb. unfortunately does not show the bottom of that hole.

1.jpg (46.16 KiB) Viewed 330 times

as has been suggested , i would use some JB weld or similar to fill all four holes.
a previous owner may have cleared them, perhaps,

[mcgovern61]

I am not sure if this would be an equivalent in the 1100 carbs, but in the same area on the 1100 carb, it appears the hole is filled and sealed with a brass ball?

Carb Cleaning 020.jpg (85.61 KiB) Viewed 322 times

Carb Cleaning 004.jpg (90.85 KiB) Viewed 322 times

[robin1731]

Went through all my 1000 parts carbs. 4 boxes worth. 20% had the hole through. But you could see that when Keihin cast the carbs it was plugged. Barely but plugged. That means the piece that was there fell out and went through the engine. (small and soft enough to not do any damage) Or at some point someone knocked it out while cleaning. At any point it was plugged when new. And when it falls out it changes nothing.

Saying that, the fact that the OP had troubles with the number four carb had nothing to do with that plug.

.

[andorragl]

I don't have any pics but I've seen a few GL1000 carbs.

I'm sorry. I didn't mean to offend or doubt you. Of course I trust what you say.

At any point it was plugged when new. And when it falls out it changes nothing.

I'm relieved to know this, it's the really important thing.

Saying that, the fact that the OP had troubles with the number four carb had nothing to do with that plug

In that case I'm sure when the rebuilding is finished it will work perfectly again. I will keep you informed.
Thanh's again.

[andorragl]

I'm sorry I completely forgot to report and close this thread.
I finally mounted the carburetors and to this day they are working perfectly.
I've no idea how can I close it.

[pidjones]

Your comment closes it for me. Glad to hear the problem is resolved.