Harley-Davidson motorcycles are renowned for their iconic designs and powerful engines. One often-overlooked component that plays a crucial role in ensuring the optimal performance of these legendary machines is the breather bolts.

What are breather bolts?

Breather bolts are a necessary component when running a custom air cleaner on your Harley-Davidson Evolution or Twin Cam motorcycle. Their primary function is to allow the engine to expel excess pressure and gases while ensuring a steady supply of fresh air for combustion. This process plays a pivotal role in maintaining optimal engine performance.

Stock air cleaners typically have a support bracket integrated, which supports the carburetor and intake manifold and keeps the carburetor from rotating downward from bumps and vibration. Stock motorcycles also direct the air from the engine breathers into the intake tract of the carburetor.

Harley-Davidsons with custom air cleaners need a separate carburetor support bracket and a set of custom breather bolts, simplifying and streamlining the entire air cleaner assembly. This typically allows for a smaller air cleaner and allows all sorts of customization to make the motorcycle look much different than stock.

Benefits of Upgrading Breather Bolts

Improved Airflow and Ventilation

Upgrading your breather kit can significantly enhance the airflow and ventilation within your Harley-Davidson engine. This improved air circulation contributes to better combustion, leading to increased power and efficiency.

Enhanced Engine Efficiency

Efficiency is the key to a Harley-Davidson motorcycle's performance. Breather bolts Sportster, when upgraded, can play a pivotal role in boosting engine efficiency.

Reduction in Oil Leaks

Oil leaks can be a nuisance for Harley-Davidson owners. Upgraded breather bolts help maintain proper pressure, reducing the likelihood of oil leaks.

Extended Engine Lifespan

A well-maintained engine lasts longer, and breather bolts are no exception to this rule.

In the end, breather bolts are essential for maintaining and improving your Harley-Davidson motorcycle's performance. By choosing the best breather kit and keeping them in good condition, you can enhance the longevity and performance of your Harley-Davidson motorcycle. You can also have a more fun and efficient ride for years to come.

At Lowbrow Custom, we offer two different thread sizes for breather bolts depending on your motorcycle's engine. For Evolution Big Twin and Sportster engines, we have 1/2"-13 thread, and for Twin Cam, we have 3/8"-16 thread.