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Author Topic: What tube is this?  (Read 354 times)

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Offline Sething

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What tube is this?
« on: November 02, 2018, 08:46:42 pm »
Could someone please identify this tube? It’s semi-clear and has a plastic connection. I know it ran down below the swing arm along with the carburetor exhaust tubes. I forgot to label it. Please assist. (And it’s not a snake)


Honda 1977 CB750K

Offline Don R

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Re: What tube is this?
« Reply #1 on: November 02, 2018, 08:55:14 pm »
 battery drain?
If the things you own end up owning you, it's better to be owned by some cool things.

Offline 754

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Re: What tube is this?
« Reply #2 on: November 02, 2018, 09:06:08 pm »
Gas tank overflow I think.. for a F model with door over gas cap.
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73 836cc.. Green, had it for 3 decades!!
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Offline Sething

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Re: What tube is this?
« Reply #3 on: November 02, 2018, 09:06:22 pm »
Thanks Don. I think you nailed it. I changed to a lithium battery so I don’t need it, which is why I probably didn’t label it.
Thank you!


Honda 1977 CB750K

Offline Bankerdanny

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Re: What tube is this?
« Reply #4 on: November 02, 2018, 10:02:46 pm »
No, Frank is right, that is the back half of the tank overflow drain tube. The front half runs along the inside of the fuel tank saddle and the plastic connector pipe at the top of the photo should plug into the back of the hose under the tank where it emerges between the tank and seat.
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Offline seanbarney41

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Re: What tube is this?
« Reply #5 on: November 02, 2018, 11:50:05 pm »
battery drain?
absolutely nothing to do with the battery
If it works good, it looks good...

Offline madmtnmotors

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Re: What tube is this?
« Reply #6 on: November 03, 2018, 10:04:41 am »
No, Frank is right, that is the back half of the tank overflow drain tube. The front half runs along the inside of the fuel tank saddle and the plastic connector pipe at the top of the photo should plug into the back of the hose under the tank where it emerges between the tank and seat.

+1

This fuel overflow drain was used on the later models with the fuel door, i.e. CB750A, F, K7/K8 to route spillage into the fuel cap "sump" to the ground instead of onto the top of a hot engine.
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Offline Sething

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Re: What tube is this?
« Reply #7 on: November 03, 2018, 10:14:26 am »
Thanks everybody. I’m going to check on both. Really appreciate this forum!


Honda 1977 CB750K

Offline Don R

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Re: What tube is this?
« Reply #8 on: November 03, 2018, 04:16:12 pm »
 They are probably correct. I'm K oriented.
If the things you own end up owning you, it's better to be owned by some cool things.

Offline 754

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Re: What tube is this?
« Reply #9 on: November 03, 2018, 04:36:13 pm »
You are disKOriented, 77 and 78 K have them..

Are you 392 and 410 intolerant ?
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Tracksnblades1

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Re: What tube is this?
« Reply #10 on: November 03, 2018, 06:49:24 pm »
On my F1 750, it's the bottom half of the Tank vent hose as Frank said.
When removing the tank on mine that line and fitting is left standing vertically near the battery vent hose. My new battery doesn't require a vent hose either but I had to leave it in there.
Age Quod Agis

Offline Don R

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Re: What tube is this?
« Reply #11 on: November 03, 2018, 07:20:59 pm »
You are disKOriented, 77 and 78 K have them..

Are you 392 and 410 intolerant ?

 Actually I'm a big F model fan. I even still own the F'nK I built for my brother. It was a 77K and has it's 392 engine, I have a 78 410 engine waiting for it's APE backcut trans. K top end and an 1124 rotating assembly.
If the things you own end up owning you, it's better to be owned by some cool things.

Offline Sething

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Re: What tube is this?
« Reply #12 on: November 03, 2018, 09:46:26 pm »
Hi guys. You guys crack me up!
The plastic attachment on the line fits perfectly with the old battery. I think we’ve got a winner.
I apologize for not making it clear that this is a Honda 1977 CB750K, not F. This is my first build.
Thanks again for the quick replies.





Honda 1977 CB750K

Offline 754

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Re: What tube is this?
« Reply #13 on: November 03, 2018, 09:56:55 pm »
Ok in the future you have to tell us the outside size..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline ekpent

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Re: What tube is this?
« Reply #14 on: November 04, 2018, 05:03:31 am »
 Usually a battery hose does not connect with a hard plastic fitting. I'm sticking with the rest of the guys and going with the gas tank overflow/water drain hose. That hard fitting is made to easily disconnect it when you remove the tank.

Offline Little_Phil

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Re: What tube is this?
« Reply #15 on: November 04, 2018, 05:20:08 am »
If the hard black pipe has a ridge on the o/d at both ends (to aid the grip of the pipe that is pushed over) and a bump in the middle then it was the fuel overflow drain. Even if someone has used it on the battery.

Offline Vintageguy

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Re: What tube is this?
« Reply #16 on: November 04, 2018, 06:04:26 am »
It is the gas tank overflow which will work beautifully with bike on the side stand with a full tank.
 

Offline flybox1

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Re: What tube is this?
« Reply #17 on: November 04, 2018, 06:18:30 am »
+1 for gas tank overflow.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Sething

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Re: What tube is this?
« Reply #18 on: November 04, 2018, 07:25:22 am »
After inspecting the bottom of the tank and the Clymer manual, there is a tube that is supposed to run from the bottom of the tank to another connection, then runs below the bike as an overflow. I have a feeling this was not connected when I bought the bike and started to disassemble it, and may have been attached to the battery by the previous owner.
Now I need to replace the tubing cuz that thing has definitely seen better days! Then I’ll attach it to where it is supposed to be.



Honda 1977 CB750K

Offline Stev-o

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Re: What tube is this?
« Reply #19 on: November 04, 2018, 07:27:36 am »
You are disKOriented...

Need to enter that in the SOHC Dikshunary, Frank!
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Offline flybox1

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Re: What tube is this?
« Reply #20 on: November 05, 2018, 10:59:28 am »
That hose nipple on the underside of the tank is to drain any spillage from the tank filler lid area, straight to ground. No stops.
This is an important safety item.  If no hose here, your gas falls right on a hot engine.   
Thats kindofa bad thing  ;)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Sething

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Re: What tube is this?
« Reply #21 on: November 05, 2018, 11:10:45 am »
Thank you. I just ordered a hose and will be installing for any overflow to be directed under the bike.


Honda 1977 CB750K

 

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