External breather systems
Grand HDF Member
Joined: Jun 2017
Posts: 4,685
Likes: 3,979
From: Near Yosemite
We'll see............
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,540
Likes: 30,870
From: Pennsylvania
@MotoJockey
It looks like they have one here, may want to give them a call and see if it can be transferred to your dealer:
Available
Iron Valley Harley-Davidson3091 Lebanon Rd.
Manheim, PA, USA
(717) 664-0888
34.21 mi away
It looks like they have one here, may want to give them a call and see if it can be transferred to your dealer:
Available
Iron Valley Harley-Davidson3091 Lebanon Rd.
Manheim, PA, USA
(717) 664-0888
34.21 mi away
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,004
From: Charleston, SC
The new HD part separates oil vapor much better than any of the aftermarket. It's cheap and worth waiting for.
Blends right in too - doesn't need to be a show piece... Working amazingly well on my 17.
Blends right in too - doesn't need to be a show piece... Working amazingly well on my 17.
Seasoned HDF Member
Joined: May 2008
Posts: 21,180
Likes: 12,757
From: South Carolina
That is the perfect way to get water into your oil, a really poor setup...
Last edited by Dan89FLSTC; Dec 7, 2025 at 03:56 PM.
Thread Starter
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Cruiser
Joined: Apr 2015
Posts: 111
Likes: 114
From: South Carolina
I thought of that too. If I were to go that route, I would run a hose off of the cover and vent it downwards to the atmosphere. This picture is just to show what's available.
Tourer
Joined: Nov 2021
Posts: 480
Likes: 321
From: FL winter, northern MI summer
I didn't want to wait for the factory cover. I ordered the NiceCNC, and it works just fine. It comes with a gasket, hose and fitting to put the filter on. It also has a reed valve under the vent hole. It's well made, only thing I don't like is the window, I might black it out, but you can't really see it unless you stick your head in there. I routed the hose up under the seat and back down.
Last edited by Kenelz; Dec 7, 2025 at 07:28 PM.
Grand HDF Member
Joined: Jun 2017
Posts: 4,685
Likes: 3,979
From: Near Yosemite
@MotoJockey
It looks like they have one here, may want to give them a call and see if it can be transferred to your dealer:
Available
Iron Valley Harley-Davidson3091 Lebanon Rd.
Manheim, PA, USA
(717) 664-0888
34.21 mi away
It looks like they have one here, may want to give them a call and see if it can be transferred to your dealer:
Available
Iron Valley Harley-Davidson3091 Lebanon Rd.
Manheim, PA, USA
(717) 664-0888
34.21 mi away
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Seasoned HDF Member
Joined: Sep 2008
Posts: 14,166
Likes: 11,263
From: San Diego, CA
I didn't want to wait for the factory cover. I ordered the NiceCNC, and it works just fine. It comes with a gasket, hose and fitting to put the filter on. It also has a reed valve under the vent hole. It's well made, only thing I don't like is the window, I might black it out, but you can't really see it unless you stick your head in there. I routed the hose up under the seat and back down.
The reed valve part would worry me.
You don't want anything to restrict the flow of crankcase pressure from the cases.
I don't believe the HD trans cover vent system has any valves.... I will surely be corrected if I am wrong.
I believe it is the design of the HD trans cover that completely coalesces the oil out of the crank case vapors, returning any oil back to the oil pan. That is how I believe you want a proper CCV system to function.
I've read many reports about the HD trans vent CCV cover saying how well it works. There are a couple riht here in this thread.
I've read too many good reports on the HD trans cover CCV system for me to want to experiment with an aftermarket company, with mixed reviews, making a gaggle of different parts from foot pegs to see-thru derby covers, and numerous racks and mounts for chassis pieces. Most of which look like knockoffs of other's stuff.
Thread Starter
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Cruiser
Joined: Apr 2015
Posts: 111
Likes: 114
From: South Carolina
Actually, according to Google anyway, the HD cover does incorporate a check valve built into the assembly.
But after thinking this through, and since winter is coming and I won't be doing a lot of riding, I'm inclined to wait for the factory cover and just run a hose to the atmosphere. I really like the way that Dan89FLSTC did his. Very simple and clean.
But after thinking this through, and since winter is coming and I won't be doing a lot of riding, I'm inclined to wait for the factory cover and just run a hose to the atmosphere. I really like the way that Dan89FLSTC did his. Very simple and clean.