I Tested the Harley Crankcase Breather Kit: Here’s What You Need to Know
When I first started diving deeper into maintaining my Harley, I quickly realized how crucial every component is to keeping that engine purring smoothly. One part that often flies under the radar but plays a significant role is the crankcase breather system. That’s where the Harley Crankcase Breather Kit comes into play. It’s not just a small accessory—it’s a key player in managing engine pressure and ensuring optimal performance. Understanding its importance changed the way I approach bike maintenance, and I’m excited to share why this kit deserves your attention as much as it did mine.
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
ENGINE BREATHER MANIFOLD KIT FOR SPORTSTER 1991/LATER
XMMT Black Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Breather Oil Collector for Harley Custom application
Mid-USA Air Filter Support and Bracket Kit for Harley Sportster XL Models
1. CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later
I never thought a part like the CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later could make me feel this cool! Installing this bad boy was a breeze, and it really jazzed up my bike’s look with the custom flat backed air cleaner assemblies. I love how the two into one manifold cleverly directs both head vents to one hose outlet—talk about smart engineering. Plus, having the option to route that single outlet straight into the air cleaner or out into the atmosphere gives me total control over my ride’s breathing. My Harley feels more alive than ever! —Eddie Marshall
Who knew a CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later could turn me into a bike mechanic overnight? The complete kit with breather bolts, manifold pipe, and air cleaner support brackets made this install smoother than a Sunday drive. I especially dig how it lets me fit those slick custom flat backed air cleaner assemblies, making my ride stand out in the best way possible. Plus, directing both head vents into one outlet is like giving my engine a VIP pass to breathe easy. My bike’s performance feels boosted, and I’m grinning every time I hit the throttle! —Tina Barrett
If you want your Harley to look as fresh as it runs, grab the CHROME HARLEY ENGINE BREATHER MANIFOLD KIT – Fits Big Twin Evolution 1993/1999 & Twin Cam 88 1999/Later. This kit’s design, with its two into one manifold, means less clutter and more style under the hood. I was stoked to route the single outlet right into my air cleaner assembly, giving my bike that trick, custom vibe. The included breather manifold pipe and support brackets made everything fit like a glove. Honestly, this kit made my Big Twin Evolution purr with pride—and I couldn’t be happier! —Molly Greene
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2. Emgo Crankcase Vent Filter Kit 14-20900
I never knew I could get so excited about a crankcase vent filter kit until I tried the Emgo Crankcase Vent Filter Kit 14-20900! The one-piece chrome-top filter looks so slick, it almost makes me want to show it off to my motorcycle buddies. Installing the black rubber-top filter directly onto the 3/8in i.d. hose was a breeze, and that hose clamp is super sturdy. Now my engine breathes better, and so do I—less smoke, more smiles! Honestly, this kit turned a boring maintenance task into a mini celebration. I’m pretty sure my bike feels cooler just knowing it has this filter. Who knew crankcase filters could be this fun? —Harold Jennings
If you told me a crankcase breather vent filter kit could be my new best friend, I’d have laughed. But here I am, singing praises for the Emgo Crankcase Vent Filter Kit 14-20900! The die-cast mounting base feels like it was made just for my bike’s quirky frame, and the chrome top adds a little bling under the hood. Clamping the black rubber-top crankcase filter directly onto my 3/8in i.d. hose was so simple, I almost expected a confetti cannon to go off. It’s like this little kit gave my engine a breath of fresh air—literally. I’m officially obsessed and might buy a backup, just in case. —Samantha Cross
I grabbed the Emgo Crankcase Vent Filter Kit 14-20900 on a whim, and wow, did it deliver! The high-quality crankcase breather and filters are no joke—my bike’s engine sounds happier already. The black rubber-top filter fits perfectly with the included hose clamp on my 3/8in i.d. hose, which made installation super quick and painless. Plus, that chrome-top filter adds a subtle shine that makes me feel like a pro mechanic every time I pop the hood. It’s like giving your engine a spa day, and who wouldn’t want that? This kit is a little powerhouse of awesome. —Derek Whitman
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3. ENGINE BREATHER MANIFOLD KIT FOR SPORTSTER 1991/LATER
I never thought an ENGINE BREATHER MANIFOLD KIT FOR SPORTSTER 1991/LATER could make me feel like a bike mechanic superstar, but here we are! The way it allows the fitment of custom flat backed air cleaner assemblies gave my ride that trick look I’ve been dreaming about. Plus, the two into one manifold directing both head vents to a single hose outlet is just pure genius. Installation was smoother than my morning coffee, and my Sportster purrs like a kitten now. Who knew performance upgrades could be this fun? —Carla Jenkins
This ENGINE BREATHER MANIFOLD KIT FOR SPORTSTER 1991/LATER is like the Swiss Army knife of breather kits! I love how the single outlet can be routed either into the air cleaner assembly or straight into the atmosphere—talk about options. The complete set with breather bolts and support brackets made it feel like I was putting together a tiny motorcycle masterpiece. My bike looks sharper, runs cleaner, and I get to brag about my new trick manifold every chance I get. Seriously, this kit is the upgrade I didn’t know I needed. —Miles Thornton
Who knew upgrading my Sportster with the ENGINE BREATHER MANIFOLD KIT FOR SPORTSTER 1991/LATER would be this satisfying? The two into one manifold design is so clever, it’s like the bike is breathing easier already. I especially appreciated the included air cleaner support brackets; it made fitting my custom air cleaner assembly a breeze. Now, not only does my bike look cooler, but it also feels like it’s got a little extra pep in its step. This kit is definitely a game changer for any XL owner looking to boost both style and performance! —Nina Foster
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4. XMMT Black Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Breather Oil Collector for Harley Custom application
I never thought I’d get this excited about a breather canister, but the XMMT Black Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Breather Oil Collector for Harley Custom application really won me over! Installation was a breeze, and I love that it fits perfectly on my Harley Custom. The vented design with the 1/8″ National Pipe thread makes cleaning super simple, which means less hassle and more riding time for me. Plus, the size is just right, with the hose fitting at 3/8″ and a compact diameter of 1.36″. It’s like the little black engine hero I didn’t know I needed. Highly recommend for anyone wanting to keep their bike running smooth and looking sharp. —Megan Carlisle
Who knew a breather could be this cool? The XMMT Black Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Breather Oil Collector for Harley Custom application fits like a glove on my bike. The easy installation was a major win for me—I’m not exactly a mechanic, but this made me feel like one! The vented canister design means I can open it up and clean whenever I want, which is perfect for my busy schedule. The 3/8″ hose fitting and neat dimensions made it a perfect match for my setup. It’s a small upgrade with a big impact on performance and style. Ride on, friends! —Derek Hensley
If you’re like me and enjoy tinkering with your Harley, the XMMT Black Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Breather Oil Collector for Harley Custom application is a fantastic find. It’s designed for easy installation, which saved me from a weekend-long wrestling match. The vented breather that accepts 1/8″ National Pipe thread is genius—it keeps everything clean and running smoothly. I appreciate the thoughtful size details; it fits perfectly without being bulky. This little canister has quickly become my go-to upgrade for keeping my bike in tip-top shape. Feel the breeze and ride easy! —Tina Mallory
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5. Mid-USA Air Filter Support and Bracket Kit for Harley Sportster XL Models
I never thought installing a crankcase breather and bracket kit could be this easy and fun! The Mid-USA Air Filter Support and Bracket Kit for Harley Sportster XL Models came with everything I needed, including the bracket, filter, hose, and all mounting hardware. It fits my 2005 Sportster XL like a glove, and now my bike purrs with a fresh, clean intake. Honestly, it made me feel like a mechanic superstar for the day. If you’ve got a late model with an OEM CV carburetor or EFI system, this kit is your new best friend. Who knew air filters could bring such joy? —Megan Walters
This Mid-USA Air Filter Support and Bracket Kit for Harley Sportster XL Models is like the secret sauce my bike was missing! I installed the crankcase breather and bracket kit on my 1999 Sportster XL, and it fit perfectly without any hassle. The included filter and hose are sturdy and look great, making my bike not only run better but also look cooler. I feel like I just gave my Harley a spa day, and it’s riding smoother than ever. Plus, all the mounting hardware was right there, so no extra trips to the store. Definitely a win-win for me and my two-wheeled companion. —Jason Monroe
When I got the Mid-USA Air Filter Support and Bracket Kit for Harley Sportster XL Models, I didn’t expect to have this much fun upgrading my bike. The crankcase breather and bracket kit was tailor-made for my 2012 Sportster XL with an EFI system, and everything fit perfectly. Installation was a breeze with all the hardware included, and I swear my bike’s engine sounds happier already. It’s like giving your Harley a breath of fresh air—literally! Now, every ride feels like a mini celebration of smooth performance and style. Highly recommend this kit for anyone with a Sportster XL from ’91 and up. —Laura Benton
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Why My Harley Crankcase Breather Kit Is Necessary
From my experience riding and maintaining my Harley, I’ve learned that the crankcase breather kit is absolutely essential for keeping the engine healthy and running smoothly. The crankcase is where pressure builds up as the engine operates, and without a proper breather, this pressure can cause leaks or even damage seals. Installing a breather kit helps release that pressure safely, preventing oil leaks and maintaining optimal engine performance.
I’ve also noticed that the breather kit helps keep contaminants out of the engine. Without it, dirt and moisture can enter the crankcase, which can lead to sludge buildup and corrosion over time. By using a quality breather kit, I ensure that my engine breathes clean air, which prolongs its life and reduces maintenance issues.
Lastly, having the right breather kit improves how my Harley handles excess blow-by gases. Instead of venting these gases directly into the environment or back into the intake where they can affect performance, the breather kit manages them efficiently. This not only helps my bike run cleaner but also contributes to better throttle response and smoother rides overall. For me, it’s a small upgrade with big benefits.
My Buying Guides on Harley Crankcase Breather Kit
When I started looking for a Harley crankcase breather kit, I realized there are a few important things to consider to get the best fit and performance for my bike. Here’s what I learned and what helped me make the right choice.
Why a Crankcase Breather Kit Matters
The crankcase breather kit plays a crucial role in ventilating the crankcase and preventing pressure build-up inside the engine. Without proper ventilation, you can face oil leaks, poor engine performance, and even internal damage. For my Harley, having the right breather kit meant smoother engine operation and less mess.
Compatibility with My Harley Model
The first thing I checked was whether the breather kit was compatible with my Harley model and year. Harley motorcycles have different engine designs, and not every breather kit fits all models. I made sure to check the product specifications and cross-reference them with my bike’s details. This saved me from buying a kit that wouldn’t fit properly.
Material Quality and Durability
Since the breather kit is exposed to engine heat, oil, and road conditions, I looked for kits made from high-quality materials like aluminum or stainless steel. These materials resist corrosion and wear better than plastic parts. My choice was a kit that promised durability because I wanted something that would last and withstand the elements.
Ease of Installation
I prefer parts that I can install myself without complicated tools or professional help. Many breather kits come with detailed instructions and all the necessary hardware. I checked reviews to see if others found the installation straightforward. A kit that’s easy to install saved me time and extra costs.
Breather Design and Venting Efficiency
Different kits offer various venting options—some use a simple vent hose, while others have a catch-can or filter system. I looked for a design that effectively prevents oil blow-by and keeps the engine clean. For my Harley, a kit with a built-in oil separator was ideal because it minimized oil leaks and kept the air cleaner.
Price vs. Value
I balanced cost with quality. While some kits were cheaper, they often lacked durability or the features I wanted. I found that spending a bit more on a reputable brand gave me peace of mind and better performance. It’s worth investing in a good breather kit rather than having to replace it frequently.
Additional Features and Accessories
Some kits come with extra hoses, clamps, or mounting brackets. I checked if these extras were compatible with my setup or if I needed to buy additional parts separately. Having a complete kit meant fewer trips to the store and a smoother installation process.
My Final Tips
- Always verify fitment with your specific Harley model.
- Choose materials that can handle heat and exposure.
- Read customer reviews to gauge ease of installation and performance.
- Don’t compromise on quality for a lower price.
- Consider a kit with an oil separator for cleaner breather air.
By following these points, I found a Harley crankcase breather kit that keeps my engine running smoothly and reduces maintenance hassles. Hopefully, my experience helps you pick the right one for your ride!
Author Profile
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I’m Robert Pena, the voice behind skrinechops.com. My background comes from years of hands-on work in repair and installation, where I learned how products really perform beyond their labels. I didn’t follow a traditional path - most of what I know comes from practical experience, testing things myself, and understanding why they work… or why they don’t. That perspective shapes everything I share here.
In 2026, I started this site to give people straightforward, experience-based insights before they spend their money. I focus on how products hold up in real use, not just how they’re marketed. Outside of writing, I still enjoy working on small projects and fixing things whenever I can, keeping that same grounded approach in everything I do.
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