well, its the carbs again...

[gltriker]

that's not much help to be honest, especially when i've written 'its the carbs again' as a title...

Was that a successful Seafoam repair, 3 years ago?
viewtopic.php?t=77486

I'm glad your not a betting man Cliff. unfortunately it didn't and she's been sitting in a school workshop since where a work colleague has spent the time since 'tinkering' as in clean, rebuild etc but the problem persists... based on recent and past posts for my dilemma, i'm going to suggest he split the plenum and try replacing those seals

Perfect, ifm61!

Robin1731 has * Professionally * serviced GL1000 carburetors long before I joined this Club 13 years ago.
Robin 1731 is a Randakk approved Carb Rebuilder. Really knows his craft if authorized by Randakk.

In Post #4, Robin 1731 had questioned if the plenum seal and the 4 individual plenum -to - carburetor flange seals had been replaced. No? You didn't want to purchase the complete Randakk kit? Yes, you can source piece by piece the rubber components.
You can purchase the plenum seal (it incorporates 2 sealed fuel passages and 1 sealed clean air passage to the air cut valve assembly) https://www.randakks.com/improved-gl100 ... r-kit.html
and a set of 4 individual plenum-to-carburetor flange seals from Randakk https://www.randakks.com/gl1000-carb-to ... r-kit.html (and several other on-line vendors, as well)

In Post #5, I attached a link to my first-hand experience' photographic evidence of those 6 'hidden' locations of probable gasoline leakage points in an assembled carbs "rack" that are all positioned upstream in the fuel delivery circuits before the gasoline eventually reaches a float bowl; at least 2 points of probable gasoline leakage are present, upstream, from each individual carburetor body's float valve needle and seat.
Take note of the float valve seat filtering screen that is positioned on each float valve seat, too. If they are missing...even very fine debris in the gasoline supply circuits will eventually prevent the inlet needle, itself, from controlling the float bowl gasoline level.
viewtopic.php?p=815878#p815878

Yes, it's a Complete teardown. Removing only the individual float bowls doesn't expose any of those 6 'hidden' points of probable gasoline leakage.
Yes,
I'm that old man that presses guys to set their vacuum pump aside, flip the still assembled carburetors "rack" upside down, remove all 4 float bowls and pressurize its entire fuel delivery path(s) from the fuel inlet barb fitting with the very affordable thumb operated pressurizing leakage tester pump to visually/audibly/externally locate any of these 6 'hidden' points of possible gasoline leaks, prior to simply blaming a float valve needle and seat. viewtopic.php?p=829950#p829950 <<<<<< the air pump
viewtopic.php?p=815867#p815867<<<<the pressure test procedure AND video

Whew! Sounds like I'm preaching...

[Sidecar Bob]

I agree that’s it’s flooding the engine.
For gas to flood the plenum wouldn’t it have to come through one of the carbs?

That's what I thought when it happened to mine. I spent hours trying to figure it out before someone on the forum suggested it could be a bad carb to plenum seal.
Here's how it works: The pump pushes fuel through the fuel passages in the plenum casting. The carb to plenum seals seal the carbs to those passages and the seal between the plenum halves seals where the passages in the halves meet so if any of them is leaking that pressure can force the fuel past that seal and into the plenum where it pools on the bottom until it is deep enough to run through one of the carbs and flood the cylinder.

[CYBORG]

As I said in my first post. Re-building Goldwing carbs is not for whimps. I do my own, so I understand all the above comments. And agree with them. Spend the time, and money, on a steep learning curve, or send them to someone who has already put in the time, and knows how to do it correct. In my opinion Robin is your man. And on another note. These bike do not like to sit. Carbs are usually the first thing to complain. Fix it ... ride it....and enjoy it. I've had my 78 since 79. It has over Half a million miles on it. Only did the carbs once. And that was only to refresh the seals and gaskets. It runs fine..... every week

[redglbx]

,, the only things I’ll add to all the above comments is just spend the money and use factory Honda needles & seats and buy the Randakk Viton seal kit ,, the Viton is necessary due to the alcohol & other additives in today’s fuels. They can be a daunting task but can be done… if it seems like to much then just send them to Robin !

Keep in mind though that once they are installed on your bike they must be synchronized on your bike as everything affects that and is imperative to proper operation.

[CYBORG]

[Sidecar Bob]

Note that since Randakk retired and sold the business the new owners have started selling the inferior kits that he always warned us about through the Randakk's Cycle Shakk storefront. The good news is that (AFAIK) they are still producing the kits he put so much effort into developing so as long as you make sure to order the kit marked Randakk's Original you should be OK.
Note also that Randakk always told us that he felt that he could not buy aftermarket jets, needles &c that met his (& Honda's) exacting standards at prices that would allow him to include them in the kits AND they so seldom actually need to be replaced that he recommended getting them from a Honda dealer on those rare occasions. That is why the only metal parts in his kits are the ones you are like to actually need: screws for the float bowls, the aluminum pucks that are sometimes destroyed on removal, cotter pins and so on.

[DUGG]

Sidecar thanks for the explanation. I’ve never noticed how the fuel was delivered to the four carbs. Now that makes sense..

[ifm61]

i asked the guy 'tinkering' with these carbs for the last 2 years plus (there's no rush i told him...) and having read a number of replies indicating the plenum gasket/seal may be a contributary factor in this scenario i asked him if it/they had been changed in any of the procedures he's performed. his reply was that if the intake manifold gasket/seals are also known as plenum gasket/seals, then yes they had been changed... so my question is - are manifold gasket/seals the plenum gasket/seals referred to in other replies?

[Sidecar Bob]

The manifolds seal to the heads with o-rings. They are never referred to as plenum seals by anyone that knows what they are talking about.

The plenum seal (AKA Air Chamber Gasket) goes between the halves of the plenum. Again this would never be referred to as a manifold seal by anyone who knows what they are talking about. In addition to sealing the halves of the plenum from air intrusion they also seal where the fuel passages in the halves meet
It looks like this (scroll down for a picture of where it goes)
https://www.z1enterprises.com/improved- ... r-kit.html

The carb to plenum seals are deep D rings that sit in recesses in the carb bodies to seal the fuel passages between the plenum and the carbs. They look like this (again scroll down for a pic of where they go)
https://www.z1enterprises.com/improved- ... r-kit.html

BTW, these parts are included in the Randakk's Original Master Carb Kit.

[robin1731]

"two years plus"? Whether you told him no hurry or not that is unacceptable. I feel bad if I don't get them back out in 2 or 3 weeks. Which rarely happens.

[redglbx]

[Track T 2411]

"two years plus"? Whether you told him no hurry or not that is unacceptable. I feel bad if I don't get them back out in 2 or 3 weeks. Which rarely happens.

I have a hard time remembering where stuff goes after a few weeks!

[Lucien Harpress]

That's the first thing I learned about sending stuff out- you ALWAYS need it done ASAP. If you let the guy know "Just get it done whenever you are able to", it'll get set on the bench and left while all the other stuff that needs done ASAP is worked on instead.

Sincerely, somebody who had to wait over a year for a paint touch-up.

[gltriker]

i asked the guy 'tinkering' with these carbs for the last 2 years

The 'tinkerer' should immediately recognize these 'rubber' fuel passages sealing items

20221006_161000 - plenum halves separated.png

AND

20230723_123707 - - carburetor flange -to - air plenum fuel seals D ring.png

20221006_161000 - plenum halves separated.png