Newb carburetor question.

[GTOJohnny67]

Hi every one. I just finish rebuilding the carbs on my 81 CB650. There is a rubber T fitting that connects each carb to the next. I was told it is a vacuum hose that keeps the fuel level even across the carbs. Mine are ripped and dry rotted. I'm trying to fined the proper name for this fitting so I can order new ones. I already used the search button and didn't find anything.
Thanks for any help you can give me.

 

[Big R]

I'm not familiar with the CB650 at all, so take this with a grain of salt:

But usually there are 2 smaller hoses on carbs: one is the overflow hose and the other is the vacuum/breather hose. That vacuum/breather hose is usually just to let the fuel pressure be relieved as gas is sucked out of the carb into the motor. So it can point anywhere - as long as water and insects don't clog it up.

 

[MotorbikeBruno]

If it's the breather hose, I usually leave em off :

If you put gas in, and it pours out of it, it's not the breather hose, it's the fuel line "T" that connects for fuel between the carbs. That is not something you can leave off

Get a picture and post it up, that's the best way to get anything solved on here. Hopefully you can get your bike up and running quickly.

 

[GTOJohnny67]

Heres what I've found. The part/s I'm missing are the tee's on 10 and 11.Tthey want 35 bucks a piece for vacuum hose tee's any one have a good parts web sight I could try first. Thanks for your time.

 

[MotorbikeBruno]

Yeah, at $70 you might be able to find another carb on Ebay.... It looks like those are just breathers though, so theoretically you could just leave them off. If the carbs overflow you might get some gas out the holes, but it shouldn't affect how the bike runs. And if they overflow...well you have a stuck float or a float needle not shutting gas off! (Can anyone verify this...I'm only going from experience with bikes Ive had)

 

[GTOJohnny67]

Thanks Bruno, I'll just leave them off for now and see what happens.

 

[MotorbikeBruno]

No problem. I figure that air is air, whether there is a tube there or not. It just makes it "cleaner" to vent them together and have 2 lines instead of 4 lines and if any gas were to come up, it would be moved away from the engine with the tubes. Toss the carbs on the bike and see what you get. I bet it runs just fine (as long as you did the rest right!)

 

[GTOJohnny67]

Well I hooked up my carbs the other day. Got the bike running, and those tee's are dumping fuel every where. So at this point I ordered the Haynes manual so I could figure out whats going on. No help what so ever. There exploded view of the carbs shows the tee's. Yet does not mention them any where in the carb rebuild section. On top of that it doesn't name them in the parts list for the carbs. Haynes manuals are now on my do not buy list. Guess I'll try down loading a Chiltons next and hope they have more detail.

 

[MotorbikeBruno]

If those are the breathers, your floats aren't shutting fuel off, so you need to make sure your float valves aren't all crummy, and that your needles are seating well. I always polish my valves out with brasso, or toothpaste on a cotten swab(both work very well) and if they are metal tipped float needles that have a "ring" around the end, it's time to replace them as they are worn. If they are rubber, some local places have some. I picked up 4 of them at my local shop for $4.50 each. Cheap investment to stop leaks. And also make sure your floats themselves are set to the right height if they are adjustable. I am attaching a pic of the non-adjustable type just in case you have those.

 

[GTOJohnny67]

Thanks again, I did just pay to have then rebuilt so I'm hoping I'm just an idiot and don't know what I'm doing. So the guy who rebuilt them is come over to take a look. Hopefully I can reconcile the situation and get the rest of this bike finished. I'm ready to go riding.