Breather system
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Tourer
Joined: Oct 2013
Posts: 275
Likes: 3
From: MD suburb of our Nation's Capital
Breather system
I just installed the new DK Breather System for stock ACs on my 2013 Street Bob.
I originally planned to route the tube to the rear breather through a hole right next to the bolt.
However, I didn't like how much the tube was crimped, so I drilled a second hole that allowed for a gentler curve in the tube. I'm plugging the first hole.
The front breather is outside the AC cover, so no hole needed there.
I ran the tube almost straight down and back a little and tied it off on the brake rod making sure that nothing was going to rub or bind.
Weather and having the bike torn apart for various mods mean I can't try it out any time soon, but I'm looking forward to seeing how it affects performance and changes my tune.
Easy install, great product.
Edit: Added fourth photo for clarity of tube routing.
I originally planned to route the tube to the rear breather through a hole right next to the bolt.
However, I didn't like how much the tube was crimped, so I drilled a second hole that allowed for a gentler curve in the tube. I'm plugging the first hole.
The front breather is outside the AC cover, so no hole needed there.
I ran the tube almost straight down and back a little and tied it off on the brake rod making sure that nothing was going to rub or bind.
Weather and having the bike torn apart for various mods mean I can't try it out any time soon, but I'm looking forward to seeing how it affects performance and changes my tune.
Easy install, great product.
Edit: Added fourth photo for clarity of tube routing.
Last edited by Silvio; Feb 20, 2014 at 04:47 PM.
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
I think it is a very healthy mod to do for your engine, but if everything was running well before, I don't think you will notice anything or need to change your tune. I am in the middle of an engine build and plan on running a tube from both breathers into a small filter.
Great pics of how to use the discrete breather system on a non-round A/C. 
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Thread Starter
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Tourer
Joined: Oct 2013
Posts: 275
Likes: 3
From: MD suburb of our Nation's Capital
The rear bolt is just inside the filter, so a hole had to be drilled.
I didn't like the placement of my first choice, right next to the bolt so I plugged that one and drilled a second hole far enough away from the bolt so the curve of the tube would not crimp it.
The filter is about as straight down from the breather as I could get and a little back. It's to the side so not inline with the back tire.
If you see a problem I'm missing, I would appreciate you pointing it out.
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Tourer
Joined: Jun 2008
Posts: 306
Likes: 7
From: Somewhere, PA
If you do this, make sure you check the filter regularly. They tend to get oil-soaked and then just become a collection area for dirt and grime, drip oil, and end up clogging up. This means that they're not doing what they're supposed to do in the first place - which is to provide a place for the engine to breathe.
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