replacement petcock
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Joined: Sep 2008
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From: San Diego, CA
If you want the OEM vacuum petcock, you'll probably have to go OEM.... HD Part #61338-94D is around $110.00 for my 2001 softail w/carb
I got rid of the vacuum petcock, got a normal petcock ($20-$30), and just capped the vacuum port on the cv40 carb....
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Joined: Jun 2010
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From: Upstate New York
This! Cap the vacuum port, install a Pingle and remember to turn off the gas when you stop.
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Joined: Feb 2015
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From: Elyria
okay I think thats the plan. I actually suspect some vacuum issues. just re read the post and saw the vacuum line goes to the carb. many thanks
whats the thread size I should look for on the petcock? 22mm?
whats the thread size I should look for on the petcock? 22mm?
Last edited by ThrillKilla; Aug 16, 2022 at 11:02 AM.
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From: South Carolina
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
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From: San Diego, CA
If you suspect bad vacuum, it could be the diaphragm in the petcock, the line to the carb, or the line has spit at/separated from the carb...
On a CV40 carb, on the back side, top of the carb (towards the intake manifold), there is a nipple that the vacuum line goes to....
I bought a 2001 softail w/carb a couple years ago. When I got the bike home, I immediately pulled the carb for a good cleaning and rebuild.. The prior owner had removed the OEM petcock and plugged the carb.
Here is a pic of the carb, right after removal and before I cleaned/rebuilt it. The view is the back side where it fits into the intake manifold. You can see a weird, right angled cap with silicone at it's base (red arrow)... That is where the petcock plugs into the carb...
I can't say I like the way the PO plugged it... I just used a smaller, straight, proper fitting cap.... Like any vacuum line or plug/cap, they can dry out over time and heat cycles... so give them a check every once in awhile...
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Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
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From: San Diego, CA
Good point, I didn't ask what year the OP's bike is..... I forgot about the VOES because my 2001 doesn't have one...
IIRC..... On the older bikes that had a VOES, both the VOES and the petcock draw their vacuum from the same carb nipple. The vacuum line has a "T" in it. He would just need to isolate the VOES line and plug that straight into the carb, in place of capping that nipple..
On the newer bikes (like my 2001) the VOES was replaced by a MAP (Manifold Absolute Pressure) on the manifold.... It takes the place of the VOES and uses manifold pressure. It doesn't plug into the carb. Only the vacuum petcock plugs into the carb..
OP, I would check your specific year/model to see if you have the MAP or VOES.... Still doable, just need to isolate the vacuum line from the VOES if you have one, to ensure it's still connected to the carb nipple....
NOTE: I just checked and it appears the 2000+ softail model years with a carb, have the MAP instead of the VOES...
Last edited by hattitude; Aug 16, 2022 at 11:39 AM.
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Seasoned HDF Member
Joined: Sep 2008
Posts: 14,143
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From: San Diego, CA
So, you have three things plumbed into the carb vacuum line.. VOES switch, vacuum petcock, and Kuryakyn air cleaner (must be older hyper charger?)....
That leaves a lot of possible vacuum leak points... best check them all..
FWIW... I try to resist suggesting people change out things that are obviously a matter of personal opinion/taste.... BUT... I just gotta say it...
Lose that Hyper charger... the best thing I can say about it is that it's just plain silly looking....
Good luck and let us know the resolution...