VOES Vacuum Source
Thread Starter
|
Intermediate
Joined: Apr 2020
Posts: 30
Likes: 4
From: Glen Allen, Virginia
VOES Vacuum Source
Still working on assembly of my 2002 883 Sportster that was bought disassembled completely with virtually no labelling of the loose parts. I have made a lot of progress but am currently, after much searching online, hung up on where the VOES is connected to vacuum. My CV40 carb has a vacuum port on top which is capped off and appears to lead to a point outside the throttle plate. Seems like it should be a source of manifold vacuum. Should my intake manifold have a port on it?
Thanks in advance.
Thanks in advance.
HDF Community Team
Joined: Dec 2011
Posts: 8,550
Likes: 3,975
From: San Diego, CA
There's a vacuum port on the top of the stock Keihin CV40 carb, near the manifold side of the carb. You will need to "T" it off to the vacuum petcock if you have one, they use the same port. You want the port outside the throttle plate to get true engine vacuum. 3/16" vacuum/gas line works
If you also have a port on the side of the carb near the fuel inlet, plug it, as it is just a carbon canister vacuum port to purge the carbon can. Probably found only on CA model carbs.
John
If you also have a port on the side of the carb near the fuel inlet, plug it, as it is just a carbon canister vacuum port to purge the carbon can. Probably found only on CA model carbs.
John
Last edited by John Harper; Oct 2, 2020 at 06:13 PM.
Thread Starter
|
Intermediate
Joined: Apr 2020
Posts: 30
Likes: 4
From: Glen Allen, Virginia
When you refer to the port "outside the throttle plate" are you referring to the air cleaner side of the throttle plate?
Last edited by Motonewbie; Oct 2, 2020 at 06:39 PM. Reason: Answered my own question. Thanks for the help.
Extreme HDF Member
Joined: Aug 2013
Posts: 16,271
Likes: 15,108
From: Somewhere SW
If you want engine vacuum you need the back side of the throttle plate, the engine side.
Years ago I drilled out a zerk fitting, removed the ball and spring and then I drilled a hole in the manifold. The gutted zerk fitting was self tapping so I screwed it into the manifold making my own vacuum port. It worked out real well.
Years ago I drilled out a zerk fitting, removed the ball and spring and then I drilled a hole in the manifold. The gutted zerk fitting was self tapping so I screwed it into the manifold making my own vacuum port. It worked out real well.
Extreme HDF Member
Joined: Aug 2013
Posts: 16,271
Likes: 15,108
From: Somewhere SW
Those parts you have may not be original.
HDF Community Team
Joined: Dec 2011
Posts: 8,550
Likes: 3,975
From: San Diego, CA
John
Trending Topics
HDF Community Team
Joined: Dec 2011
Posts: 8,550
Likes: 3,975
From: San Diego, CA
John
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Extreme HDF Member
Joined: Aug 2013
Posts: 16,271
Likes: 15,108
From: Somewhere SW
The CV diagrams that I'm looking at show a port
HDF Community Team
Joined: Dec 2011
Posts: 8,550
Likes: 3,975
From: San Diego, CA
After they put on a MAP sensor, that carb port was just used to operate the vacuum petcock, AFIK.
John
John