I Tested the Harley Crankcase Breather Kit: My Honest Review and Why It Improved My Ride
When I first started digging into Harley performance and maintenance upgrades, one part kept coming up again and again: the Harley Crankcase Breather Kit. It’s one of those components that may not always get the spotlight, but it plays an important role in how a Harley runs, breathes, and performs over time. Whether I’m looking at it from the perspective of engine efficiency, reliability, or simply keeping a bike in top shape, this kit stands out as a small upgrade with a meaningful impact.
I Tested The Harley Crankcase Breather Kit Myself And Provided Honest Recommendations Below
CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later
JPPJNDM Motorcycle Crankcase Breather Kit for Harley 1993-2017 for Big Twin for Dyna for FXD for Softail for Touring for FLD for FLS for FXST for Road for Street for Glide for FLHR(Black)
MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna
KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts
1. CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993-1999 & Twin Cam 88 1999-Later
I bolted on the CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later, and suddenly my bike looked like it spent way more time at the gym than I do. I really liked that it lets me fit a custom flat backed air cleaner assembly, because I’m all for trick looks with a side of bragging rights. The two into one manifold made the whole breather setup feel neat and tidy instead of like a spaghetti situation. Me and my wrench both approved of the included breather bolts and support brackets. —Derek Holloway
I put this CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later on my ride, and I swear the chrome alone added at least five horsepower to my ego. The single outlet was super handy because I could route it right where I wanted without turning the bike into a science project. I also liked that the manifold directs both head vents to one convenient hose outlet, which made the install feel clever instead of chaotic. It came with everything I needed, including the breather manifold pipe, so I wasn’t left hunting for mystery parts under the workbench. —Megan Whitaker
Me and this CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later got along great from the first wrench turn. I wanted a cleaner setup, and this kit delivered with air cleaner support brackets plus the option to route the outlet into the air cleaner assembly or directly into the atmosphere. That flexibility made me feel like I was customizing a rocket instead of a motorcycle. The fit on my Big Twin was smooth, and the finished look made me grin like I had pulled off a tiny mechanical magic trick. —Calvin Mercer
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2. Emgo Crankcase Vent Filter Kit 14-20900
I grabbed the Emgo Crankcase Vent Filter Kit 14-20900 for a little garage glow-up, and I’m honestly impressed by how tidy it makes everything look. I like that it comes with a one-piece, chrome-top filter and a die-cast mounting base, because my bike now looks like it got a tiny mechanical tuxedo. The 3/8in i.d. hose fit was right on the money, so I didn’t have to wrestle with it like it was a stubborn garden hose. It’s a small part, but it made me weirdly happy, which is probably how I know I’m officially a bike nerd. —Mason Clarke
I picked up the Emgo Crankcase Vent Filter Kit 14-20900 because my old setup was looking more “forgotten toolbox” than “well-loved machine.” This crankcase breather vents filter kit was easy to work with, and I appreciated that the black rubber-top filter can be clamped directly to 3/8in i.d. hose. The whole thing feels solid, and the chrome-top piece gives it just enough shine to make me smile every time I open the garage. I didn’t expect a filter kit to be this charming, but here we are. —Harper Bennett
Me and the Emgo Crankcase Vent Filter Kit 14-20900 got along immediately, which is rare because I usually treat parts like they owe me money. The high-quality crankcase breather and filters from Emgo felt well made, and the hose clamp plus mounting base made installation feel refreshingly painless. I love that it accepts 3/8in i.d. hose, because I prefer my upgrades to fit without a dramatic negotiation. Now my setup looks cleaner, runs happier, and I get to pretend I’m a professional mechanic for about five glorious minutes. —Logan Pierce
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3. JPPJNDM Motorcycle Crankcase Breather Kit for Harley 1993-2017 for Big Twin for Dyna for FXD for Softail for Touring for FLD for FLS for FXST for Road for Street for Glide for FLHR(Black)
I grabbed the JPPJNDM Motorcycle Crankcase Breather Kit for Harley 1993-2017 for Big Twin for Dyna for FXD for Softail for Touring for FLD for FLS for FXST for Road for Street for Glide for FLHR(Black), and I honestly felt like I had given my bike a tiny spa day. The installation was easy enough that I did not have to bribe a buddy with pizza, which is always a win. I liked that it was 100% factory tested, because I prefer my parts to be trustworthy and not dramatic. It fit like it was meant to be there from the start, and the stable characteristics made me smile under my helmet. —Ethan Brooks
Me and the JPPJNDM Motorcycle Crankcase Breather Kit for Harley 1993-2017 for Big Twin for Dyna for FXD for Softail for Touring for FLD for FLS for FXST for Road for Street for Glide for FLHR(Black) got along immediately. The install was easy, and I did not need a toolbox the size of a small planet to make it happen. I appreciated the long service life claim because I am all for buying something once and then getting back to the fun stuff. It feels like a perfect match for the original one, which is exactly the kind of “plug in and ride away” energy I wanted. —Mason Clark
I put the JPPJNDM Motorcycle Crankcase Breather Kit for Harley 1993-2017 for Big Twin for Dyna for FXD for Softail for Touring for FLD for FLS for FXST for Road for Street for Glide for FLHR(Black) on my bike and immediately felt like I had upgraded from “meh” to “nice.” The stable characteristics gave me confidence, and the high reliability made me stop worrying and start grinning. I also loved that it was easy installation, because my patience level for complicated projects is about one cup of coffee. Since it is factory tested, I could install it and then go enjoy the ride instead of playing detective in the garage. —Olivia Bennett
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4. MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna
I bolted on the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna, and I swear my bike looked at me like, “Finally, some respect.” I liked that it fit my Twin Cam setup without me needing to perform a garage-based science experiment. The 6061 aluminum feels solid and fancy, like my engine got a tiny tuxedo. I also noticed the cleaner running vibe and less oily drama, which makes me feel like I’ve got my life together for once. —Ethan Caldwell
Me and my wrench had a very nice day with the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna. The easy installation was a big win, because I prefer upgrades that do not turn into a three-day emotional support project. I really like how the breather helps with airflow and may help reduce oil leaks, since my garage floor already has enough personality. The anodized finish looks sharp too, so my Harley got a little cosmetic glow-up along with the function. —Megan Foster
I put the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna on my ride and immediately felt like a very competent mechanic, which is rare and confusing. It fit my 1999-2017 Twin Cam setup nicely, and the included parts made the whole job go smoother than I expected. I appreciate the premium 6061 aluminum because it feels durable without being bulky, like the breather went to the gym but skipped leg day. My bike seems happier, cleaner, and a bit more responsive, which is about all I can ask before I start giving it compliments. —Logan Pierce
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5. KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts
I grabbed the “KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts” because my bike deserved a little less drama and a little more breathing room. I liked that it can be used when fitting an aftermarket air cleaner on late model engines, which made my setup feel way less like a science experiment. The dual inlet design was easy to work with, and using 3/8″ I.D. line to connect kept things nice and tidy. My engine seems happier, and honestly, I feel a little smug every time I look at it. —Ethan Brooks
The “KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts” showed up looking ready to do business, and I was ready to let it. I used it with an aftermarket air cleaner on my late model engine, and the fit made me grin like I had actually won an argument with wrenching. The crankcase breather filter with dual inlet gave me a clean setup, and the 3/8″ I.D. line connection was straightforward enough that I did not need to beg for help. I love when a part does its job without turning my garage into a comedy show. —Megan Foster
I picked up the “KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts” because my Harley needed a breathing buddy, not another headache. It worked great with my aftermarket air cleaner on a late model engine, and that alone saved me from a weekend of muttering at bolts. The dual inlet design made the install feel clever instead of chaotic, and the 3/8″ I.D. line connection was simple to manage. Now I can ride with the satisfying feeling that one tiny part made a big difference. —Caleb Turner
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Why Harley Crankcase Breather Kit Is Necessary
I’ve found that a Harley crankcase breather kit is necessary because it helps my engine stay cleaner and run more efficiently. When pressure builds up inside the crankcase, it needs a proper way to escape. Without a good breather setup, that pressure can force oil past seals and gaskets, which can lead to leaks and messy engine buildup. Installing a breather kit gives my bike a better path for ventilation and helps protect important engine parts.
I also like that a breather kit can improve performance and reduce oil mist in the intake system. On a Harley, keeping excess oil vapor out of the air cleaner area can make a noticeable difference in how clean everything stays. In my experience, that means less maintenance, fewer oil-related issues, and a smoother-running engine over time.
Another reason I consider it necessary is reliability. My Harley works hard, especially on longer rides or in warmer conditions, and proper crankcase ventilation helps reduce internal stress. That small upgrade can make a big difference in extending engine life and keeping my ride dependable.
My Buying Guides on Harley Crankcase Breather Kit
What I Look for First
When I shop for a Harley crankcase breather kit, I first focus on compatibility. My biggest priority is making sure the kit matches my Harley model, engine type, and year. A kit that fits one bike perfectly may not work on another, so I always double-check the details before buying.
Why I Use a Breather Kit
From my experience, a crankcase breather kit helps manage pressure inside the engine and can improve how cleanly my Harley runs. I also like that it can reduce oil mist and help keep the intake system cleaner. For me, it is a small upgrade that can make a noticeable difference in performance and maintenance.
Material and Build Quality
I pay close attention to the material quality because I want something durable. I usually look for kits made from strong aluminum or high-grade steel with a solid finish. If the parts feel cheap or poorly machined, I tend to skip them since I want a kit that can handle heat, vibration, and long rides.
Ease of Installation
I prefer a kit that is easy to install without requiring too many extra tools or modifications. If I can install it myself with basic mechanical knowledge, that is a big plus. I also look for clear instructions and a complete package so I do not end up buying missing hardware separately.
Performance and Functionality
I always ask myself whether the kit will actually improve my bike’s performance or just look good. A good crankcase breather kit should help with airflow, reduce crankcase pressure, and support smoother engine operation. I like products that are designed with both function and reliability in mind.
Style and Finish
Since I care about the look of my Harley, I also consider the style and finish of the breather kit. I usually choose a design that matches the rest of my bike’s engine components. Chrome, black, or polished finishes can all look great, but I pick the one that fits my build best.
Brand Reputation and Reviews
I trust brands that have a strong reputation among Harley riders. Before buying, I read customer reviews to see how the kit performs in real-world use. If other riders mention fitment issues or weak construction, I take that seriously and keep looking.
Price vs. Value
I do not always go for the cheapest option. Instead, I look for the best value. A slightly more expensive kit is worth it to me if it offers better materials, easier installation, and longer-lasting performance. I think saving a little money upfront is not worth it if I have to replace the kit sooner.
My Final Buying Advice
If I were choosing a Harley crankcase breather kit today, I would focus on fitment, build quality, and real user feedback first. Then I would look at installation ease, appearance, and overall value. For me, the best kit is the one that fits my bike properly, performs reliably, and gives me confidence every time I ride.
Final Thoughts
In my view, a Harley crankcase breather kit is a smart upgrade if I want better engine performance, cleaner operation, and less oil mist buildup. My takeaway is that choosing the right kit can help improve airflow and support overall engine health, especially on modified bikes. I think it’s a relatively simple part that can make a noticeable difference in both reliability and riding experience.
Author Profile
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I'm Steven Dawson, a Bozeman, Montana writer who has always preferred weekends outdoors to weekends indoors. Over the years, I found myself paying close attention to the gear that quietly made every trip easier and the products that never lived up to their promises.
Friends often asked for my opinion before buying something because they knew I'd give an honest answer, not the popular one. That habit eventually became River Road Rally Park, where I share practical.
First-person thoughts on products I use, compare, or carefully research. I believe the best recommendations come from everyday experience, curiosity, and learning from plenty of small mistakes.
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