Carburetor Vacuum Bulk Hose - Not low speed jets

[DarkSideR]

After much research as to why my Valkyrie was running rough at low RPM's, and having trouble starting. I decided to clean the Carbs. To my surprise the inside of the Carbs were in great shape. However while in the process of disassembling the Carbs I notices a 2.5" Vacuum line on the side of each Carb. All 6 of these Bulk Hose Vacuum lines were cracked at their ends. I simply replaced all 6 damaged vacuum lines, and now the bike runs like new. In all my research I never heard mention of these, nor anything about these being a problem.

FYI - These Bulk Hose Vacuum lines can be easily replaced. You do not have to remove the Carbs to replace the tubes. I would suggest removing the chrome linkage covers to inspect your Bulk Hose Vacuum lines, and replace if needed.

[Ricky-D]

Those are the air cut valve hoses.

Thanks for posting that.

It's been mentioned a few times in past postings.

Those particular hoses are overlooked frequently.  They can be the cause of poor idle characteristics and popping & gurgling.

***

[old2soon]

One more item to add to the list of do for my honey.  Unlike a honey do-this i look forward to.  RIDE SAFE.

[longrider]

did you take a few pictures of the location of the hoses?

warren

[DarkSideR]

@Warren. I did not. They however are attached to the side of each Carb. Remove the chrome linkage cover, and peer between each carb. You are looking for a little black tube only 2.5" long.

I used my fingers, a flat head screw driver, and needle nose pliers to remove and replace the lines.

[miscott]

Glad I found this post today.
My Valk has ben running rough for a couple weeks. Almost sounded like a V-Twin.  
From what I'd read previously in these threads, I was thinking that it must be a vacuum line.
Yesterday, I finally got around to checking the plugs. They all looked really good, except for the #6 plug. While I was down there, I got to looking around and noticed what I assumed was a vacuum line connected to a nipple on the side of the #6 carb. There was about a half inch split in the end where it connected to that nipple. Pulled off the split end, wrapped tightly with black electrical tape, slipped the end back on the nipple, and WOW. Purring like a Kitten! Took it out for a ride to blow out the cobwebs and she's running like a top!
 My question is, what size ID is that tubing?
Don't really like the idea of "patching" a problem as I'd rather replace the tubing.
Thinking that when winter finally sets in and the Valk has some down time, I may go ahead and do the de-smog thing.
 Are those tubes connected to the sides of the carbs part of the Vacuum tubing system that is eliminated by the de-smog kit?

[sugerbear]

Glad I found this post today.
My Valk has ben running rough for a couple weeks. Almost sounded like a V-Twin.  
From what I'd read previously in these threads, I was thinking that it must be a vacuum line.
Yesterday, I finally got around to checking the plugs. They all looked really good, except for the #6 plug. While I was down there, I got to looking around and noticed what I assumed was a vacuum line connected to a nipple on the side of the #6 carb. There was about a half inch split in the end where it connected to that nipple. Pulled off the split end, wrapped tightly with black electrical tape, slipped the end back on the nipple, and WOW. Purring like a Kitten! Took it out for a ride to blow out the cobwebs and she's running like a top!
 My question is, what size ID is that tubing?
Don't really like the idea of "patching" a problem as I'd rather replace the tubing.
Thinking that when winter finally sets in and the Valk has some down time, I may go ahead and do the de-smog thing.
 Are those tubes connected to the sides of the carbs part of the Vacuum tubing system that is eliminated by the de-smog kit?

no they are not, but are included in the rebuild kit from redeyetech on e-bay
not sure the size

[Valkyr01]

Glad I found this post today.
My Valk has ben running rough for a couple weeks. Almost sounded like a V-Twin.  
From what I'd read previously in these threads, I was thinking that it must be a vacuum line.
Yesterday, I finally got around to checking the plugs. They all looked really good, except for the #6 plug. While I was down there, I got to looking around and noticed what I assumed was a vacuum line connected to a nipple on the side of the #6 carb. There was about a half inch split in the end where it connected to that nipple. Pulled off the split end, wrapped tightly with black electrical tape, slipped the end back on the nipple, and WOW. Purring like a Kitten! Took it out for a ride to blow out the cobwebs and she's running like a top!
 My question is, what size ID is that tubing?
Don't really like the idea of "patching" a problem as I'd rather replace the tubing.
Thinking that when winter finally sets in and the Valk has some down time, I may go ahead and do the de-smog thing.
 Are those tubes connected to the sides of the carbs part of the Vacuum tubing system that is eliminated by the de-smog kit?

The tubing on the Air Cutoff Valve attached to the carb is not eliminated by de-smog kit.
I'm in the middle of a carb overhaul now. Already did de-smog.
I got new parts (o-rings, gaskets, and this tubing) in the kit from Redeye.
Don't know if you can replace tubing without unscrewing and popping out the Cut Valve. Watch for o-rings if you do take it out. Refer to top of page 5-9 in Honda Manual (which you can find here -http://www.valkyrienorway.com/Tech%20tips%20(links).html I can't find any reference to size of tubing in the manual.

update: just measured tubing - about 1/8" I.D. Easy enought to put on Air Cutoff Valve, a bit harder to slip back onto carburetor.

[sandy]

OEM tubing is 3.5 mm. Lots of folks use 5/32 tubing. 1/8 is too small.

[9Ball]

per the parts fiche, these air cut off lines are in fact 3.5 mm hose, part #28 in carb components diagram and are sold as bulk tubing.

28 BULK HOSE (3.5X1000)
95005-35001-20M 

[Bone]

(3.5 x 1000) 1000 what ? anyone know ?

[Blackduck]

1000 mm= 1metre, (3.5 x 1000 would suggest they sell bulk by the metre )
5/32" =.1563 thou = 3.97 mm
1/8" = .125 thou = 3.175
3.5mm = .138 thou
For pressure lines the 1/8 would be the choice biut for vacuum cannot see a problem with 5/32

[9Ball]

(3.5 x 1000) 1000 what ? anyone know ?

mm (millimeters)

we have metric bikes...

[miscott]

  Ordered the 6 Air Cutoff Valve tubes from Redeye this evening. Less than $6.00, shipping included. Should be here in a few days.  
 Turns out that everything thats in the carb re-build kit, he does sell seperately.
 A hearty Thanks to everyone for the info in this thread. 

[DarkSideR]

I am so glad this post helped someone. It's actually quite an easy fix compared to a carb cleaning/rebuild.