450 carb vacume port

[Charlie G]

Reciently, while reinstalling the vacume line to the left hand carb I noticed that the vacume port, which consists of a casted elbow, pressed into the carb, rotated as I reinstalled the vacume line. I haven't tried to remove this elbow and before I do I wanted to ask if anyone could recomend anything to reaseal it with once I remove it? I've checked the parts diagram and my manual and it appears as it's not intended to be a removable, servicable part, but could be a source for a vacume leak. Thanks for your help!


Charlie G.

[Nessism]

I've never seen a "casted elbow" vacuum port. Can you post a photo?

[Charlie G]

The elbow the black vacume line attaches to, will rotate, front to back and I'm concerned it is a possable source for a leak. Thanks!

cg

[Dave8338]

If it rotates, I would think that the only way to seal it would be with an
o-ring. That setup is new to me, as well.

[terrylee]

I have a 450 and I'll check when I get home, but I don't think mine moves. If is not suppose to I could see it causing a leak. terrylee

[Charlie G]

If it rotates, I would think that the only way to seal it would be with an
o-ring. That setup is new to me, as well.

That was my thought, but the parts diagram dosen't show it removable, let alone with and o-ring.

cg

[terrylee]

Checked mine on the 450, and it does not! move. If your does I say it's broken. Might be able to fix with some jb weld. Could affect the vacuam to petcock? terrylee

[Charlie G]

I pulled it off. Does anyone know what I might use to seal this pressed in piece? Thanks or your help.

Charlie G.

[djg42]

Mine moves too, thats the fuel line for the ON/RES setting right? I did notice my bike runs better on PRIME, maybe its becuase thats loose?

[Nessism]

You could try JB Weld or one of those gas tank sealing products.

BTW, have you ever changed the intake boot O-rings on that bike? Looks like the stock phillips screws attaching the boots so looks like no.

[Charlie G]

Mine moves too, thats the fuel line for the ON/RES setting right? I did notice my bike runs better on PRIME, maybe its becuase thats loose?

The picture I have shown is the vavcume line , which operates the petcock. The petcock on my 1980 450e has no prime function. If you have a prime function and the bike runs (better) with the petcock set there, I suspect there is something wrong. This connection needs to be tight. I'm looking for a recomendation from someone as to what I might use to re-seal this loose elbow vacume connection.

Let me know if you want more of my 2 cents on petcock failure. I've been through it once.

Charlie G.

[Charlie G]

You could try JB Weld or one of those gas tank sealing products.

BTW, have you ever changed the intake boot O-rings on that bike? Looks like the stock phillips screws attaching the boots so looks like no.

Ed.

Good catch there! I have the o-rings and have been busy getting the 650 reliable. That done, I'm starting on the 450.

Just reassembled the bike after doing the valves ( holy cr*p!, what a difference) and noticed this elbow was loose. I'm thinking I should tear down the carbs, replace boots and such, and then address this fitting.

JB weld, ya think?

Thanks for posting back.

Charlie G.

[Macguyver]

You could use JB Weld, or 2 part epoxy, just make sure to use a scotch-brite pad or some fine sand paper and clean up both surfaces so you will get best adhesion. Oh, and make sure none of the sanding/cleaning dust gets in there, or is cleaned out nicely.

I would likely stick a q-tip in the hole before sanding the inside of the hole, so when you pull out the q-tip, it cleans the hole for you.

Best of luck and let us know how it goes.

[thevillaindylan]

I have a '81 Gs450T, this part pivots and comes out the same way. The micro fiche doesn't show this as a seperate part from the carb body. I believe this is supposed to be removable because the idle mixture screw is behind this "elbow" and being able to pivot this piece allows access to the screw.

[bgmart450]

I've pulled mine out and it still rotates freely once I put it back. I haven't had any issue with it this way.