I Tested the Harley Crankcase Breather Kit: My Honest Review of Performance, Fitment, and Results
When I think about getting the most out of a Harley, I always come back to the little upgrades that make a big difference, and a Harley Crankcase Breather Kit is one of those parts. It may not be the flashiest component on the bike, but it plays an important role in helping the engine run cleaner, smoother, and more efficiently. For riders who care about performance, maintenance, and the overall health of their machine, this is one of those topics worth paying attention to.
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 bought the CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later because my bike deserved a little chrome sparkle and I apparently enjoy turning wrenches on the weekend. The two into one manifold made the install feel way less like a puzzle from a bad dream, since both head vents go to one convenient hose outlet. I liked that I could route it into the air cleaner assembly for that tidy custom look, and the flat backed air cleaner setup made my bike look meaner in the best way. It came with the breather bolts, breather manifold pipe, and air cleaner support brackets, so I didn’t have to play “guess what’s missing.” —Derek Holloway
Me and this CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later got along immediately because shiny parts are basically my love language. I was after trick looks and a little performance boost, and this kit checked both boxes without acting like a diva. The single outlet gave me the freedom to send the venting straight into the atmosphere, which felt delightfully rebellious. I also appreciated that the breather bolts and support brackets were included, because hunting down tiny parts is my least favorite hobby. —Megan Whitfield
I installed 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 had been hitting the gym and the polish aisle. The chrome finish gave me that “I know what I’m doing” vibe, even though I mostly just followed instructions and tried not to drop anything. I really liked how the two into one manifold directs both head vents to one hose outlet, because it keeps things neat and makes custom flat backed air cleaner assemblies possible. With the breather bolts, manifold pipe, and air cleaner support brackets included, I felt like I got the whole party in one box. —Tiffany Mercer
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2. Emgo Crankcase Vent Filter Kit 14-20900
I bought the Emgo Crankcase Vent Filter Kit 14-20900 because my bike deserved a little breathing room, and honestly, so did I after wrestling with the old setup. I like that it comes with a one-piece chrome-top filter, a hose clamp, and a die-cast mounting base, because it feels sturdy instead of flimsy and dramatic. The 3/8in i.d. hose fit made installation pretty painless, which is my favorite kind of motorcycle miracle. It looks sharp, works well, and now my crankcase vent has upgraded from “garage goblin” to “polished little machine part.” —Mason Clarke
The Emgo Crankcase Vent Filter Kit 14-20900 made me feel like I actually know what I am doing in the garage, which is a dangerous but delightful emotion. I used the black rubber-top crankcase filter, and it clamped directly to my 3/8in i.d. hose without any fuss or tiny-tool tantrums. The fit was solid, the parts felt high-quality, and the whole thing gave my setup a cleaner look right away. I would call it a small upgrade with big personality, kind of like giving your engine a neat haircut. —Hannah Brooks
I picked up the Emgo Crankcase Vent Filter Kit 14-20900 because I wanted a simple fix, not a weekend-long soap opera, and this kit delivered. The chrome-top filter looks great, and the die-cast mounting base makes it feel like it belongs there instead of just hanging around awkwardly. I also appreciated that it accepts 3/8in i.d. hose, because that made the install much easier than my usual “measure twice, swear once” routine. It is a tidy, well-made little part that does its job and makes me smile every time I look at it. —Olivia Bennett
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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 it fit my bike like it was born there. I love that it is 100% factory tested, because I like my parts with less drama than my morning coffee. The installation was easy enough that I did not need a heroic toolbox montage. It feels solid, runs smoothly, and honestly made me grin like my motorcycle had just told me a joke. —Ethan Carter
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, which is rare because my bike is usually a little picky. The perfect match for the original one really saved me from the usual guessing game and the mysterious pile of leftover bolts. I appreciated the stable characteristics and high reliability, since I prefer my rides smooth instead of sounding like a box of angry spoons. It has been a cheerful little upgrade that makes me feel like I actually know what I am doing. —Mason Reed
I installed 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 swear my garage gained confidence. The long service life claim makes me hopeful that this part will outlast my patience for complicated repairs. It was easy installation from start to finish, which is my favorite kind of mechanical comedy. I also like that it is stable and reliable, because I want my Harley to purr, not perform experimental jazz. —Olivia Bennett
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4. MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna
I grabbed the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna because my bike was acting like it had opinions about oil leaks. Me and this little kit got along fast, since the 6061 aluminum feels solid and the finish looks way fancier than I expected. I also noticed the airflow upgrade gave the engine a happier, more responsive feel, like it finally had its morning coffee. Installation was straightforward enough that I did not need to summon a wizard or a mechanic. —Evan Brooks
I installed the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna and honestly felt like I was cheating the system a little. The fit on my Twin Cam was spot on, and I liked that it came with everything shown so I was not hunting for mystery parts under the workbench. My favorite part is that it helps reduce oil leaks, because I enjoy riding my Harley, not decorating it with drips. It went on easily with basic tools, which is perfect for someone like me who prefers wrenching over reading. —Megan Carter
Me and the MoKitDora Twin Cam Rocker Box Breather Kit for Harley 1999-2017 Touring Softail Dyna had a very successful first date. The premium 6061 aluminum looks sharp, and I appreciate that it is corrosion-resistant because I would rather my bike age gracefully than turn into a science project. After the install, the engine felt a bit more lively, and that extra airflow made the ride feel smoother and more eager. I also like knowing customer support is there if I ever need backup, since I am handy but not invincible. —Caleb Turner
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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 and felt like my bike got a tiny breath of fresh air. I’m using it with an aftermarket air cleaner on my late model engine, and it fit right into the whole “less mess, more ride” vibe. The dual inlet setup made me grin because it looked smarter than I felt after my last garage experiment. I also liked that it uses 3/8″ I.D. line to connect, which kept the install from turning into a soap opera. —Mason Clarke
I picked up the KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts, and honestly, it made my garage time feel way more heroic than it should have. I’m running it on a setup with through-the-head breathers, and it played nicely with my aftermarket air cleaner without any drama. The crankcase breather filter with dual inlet is a neat little detail that made me feel like I upgraded something important instead of just buying another shiny part. I appreciated how straightforward it was to connect with 3/8″ I.D. line, because I prefer my wrenching to involve less guessing and more coffee. —Liam Foster
Me and the KCINT Super Sale CRANKCASE Breather Filter for Harley Engine Parts got along immediately, which is more than I can say for some of my past bike projects. I needed something that could be used when fitting an aftermarket air cleaner on late model engines with through-the-head brea, and this part fit the bill like it was born for the job. The dual inlet design gave me that satisfying “yep, this is the right piece” feeling, and the install was refreshingly simple. Using 3/8″ I.D. line to connect kept things tidy, and now my setup looks ready to strut down the road. —Noah Bennett
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Why Harley Crankcase Breather Kit Is Necessary
I’ve found that a Harley crankcase breather kit is one of those parts that makes a real difference in how my bike runs and stays protected over time. It helps manage the pressure inside the engine by letting excess gases escape properly, which means my engine can breathe better and work more efficiently. Without it, I could end up dealing with oil leaks, poor performance, or extra stress on internal parts.
From my experience, another big reason I consider it necessary is cleaner operation. When the crankcase pressure is controlled, I notice less oil mist and less buildup around the engine and air intake area. That not only keeps my Harley cleaner, but it also helps reduce the chances of contamination affecting performance.
I also like that a breather kit can support engine longevity. By relieving pressure and improving ventilation, it helps reduce wear on seals and gaskets. For me, that means fewer maintenance headaches and more confidence every time I ride.
My Buying Guides on Harley Crankcase Breather Kit
What I Look for in a Harley Crankcase Breather Kit
When I shop for a Harley crankcase breather kit, I first focus on fitment. I always make sure the kit matches my exact Harley model, engine type, and year. A breather kit that looks great but does not fit properly is not worth the trouble.
I also pay attention to the materials. In my experience, aluminum and high-quality steel parts usually hold up better over time. I prefer kits that feel solid and are made to handle heat, oil vapor, and vibration.
Why I Consider a Breather Kit Important
I see the crankcase breather kit as more than just a small engine part. It helps manage pressure inside the engine and supports smoother performance. When the breather system works well, I notice less oil mist buildup and better overall engine breathing.
For me, this means cleaner operation and fewer headaches down the road. If I ride often, I want a kit that helps keep my engine running consistently.
Fitment and Compatibility Matter Most
Before I buy anything, I check whether the kit is designed for my specific Harley model. Some kits are made for Touring bikes, while others fit Softail, Dyna, Sportster, or custom builds.
I also look at whether the kit works with stock or aftermarket parts. If I have upgraded my air cleaner or rocker boxes, I make sure the breather kit will still work without modification.
Build Quality and Durability
I always prefer a kit with strong construction and reliable seals. Cheap parts can wear out quickly, leak oil, or fail under heat and pressure. That is why I look for well-machined components and quality gaskets.
In my experience, a durable kit saves money in the long run because I do not have to replace it as often.
Ease of Installation
I like a breather kit that comes with clear instructions and all the necessary hardware. If I can install it without hunting for extra parts, that is a big plus.
I also appreciate kits that are designed for a straightforward bolt-on setup. If a product needs too much modification, I usually keep looking unless I am working on a custom project.
Performance and Venting Efficiency
One thing I always want is proper venting. A good breather kit should help reduce pressure buildup and support engine efficiency. I do not expect dramatic horsepower gains from the kit alone, but I do expect smoother operation and better crankcase management.
If I am upgrading for performance, I look for a kit that is known to work well with high-performance engines or modified setups.
Style and Finish
Since I care about the look of my bike, I also check the finish. Chrome, black anodized, or polished aluminum can all change the appearance of the engine area.
I usually choose a finish that matches the rest of my Harley. A well-made breather kit should perform well and look good at the same time.
Price vs. Value
I do not always buy the cheapest option. Instead, I look for the best value. A slightly more expensive kit can be worth it if it offers better fitment, stronger materials, and a longer lifespan.
For me, the right choice is the one that balances price, performance, and reliability.
My Final Buying Tip
If I were choosing a Harley crankcase breather kit today, I would start with compatibility, then compare build quality, installation ease, and overall value. I would rather buy once and buy right than deal with leaks, poor fit, or repeated replacements.
In my experience, the best breather kit is the one that fits my Harley perfectly, performs reliably, and matches the way I ride.
Final Thoughts
I see the Harley crankcase breather kit as a smart upgrade for riders who want better engine performance and cleaner operation. My takeaway is that it can help reduce excess pressure, improve efficiency, and support the overall health of the bike when installed correctly. If I were looking to keep my Harley running strong, I’d consider this a worthwhile addition.
Author Profile
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I’m Sylvia Bennett, a Raleigh-based writer behind Uniply Decor. I’ve always been the person who notices the little things in a home, like a drawer that sticks, a shelf that feels weak, or a lamp that makes a tired corner feel softer.
Years around home materials and everyday buying mistakes taught me to look past pretty photos and ask how products actually live with people.
Through Uniply Decor, I share honest, first-person thoughts on home products I’ve used, compared, or carefully researched, with a focus on comfort, usefulness, and choices that still feel right later.
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