S&S Cycle Breather Gear Kits — 1999-2017 Harley-Davidson

S&S Cycle billet head breathers for 1999-2017 Harley big twins, machined from 6061 aluminum and anodized in S&S blue. The proprietary Labyrinth internal design significantly reduces oil pass-through into the intake manifold, replacing ineffective stock mesh filters with a maintenance-free sealed unit.

Features

• Unique Labyrinth design reduces oil consumption
• 6061 aluminum billet construction
• Anodized S&S blue finish
• Maintenance-free sealed design
• Less oil carryover into intake versus stock breathers

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 900-1299
• Material: 6061 Aluminum
• Finish: Anodized S&S Blue
• Weight: 0.8 lb
• Category: Drivetrain / Final Drive Gears

Fitment

Fits 1999-2017 Harley-Davidson big twin models.

Frequently Asked Questions

Will these fit my Sportster?

No — these breathers are designed for 1999-2017 big twin engines. Sportster models require a different breather kit.

Do I need to service or replace a mesh filter?

No. The Labyrinth design is maintenance-free and sealed, eliminating the need to clean or replace mesh filters.

How much does this reduce oil carryover?

The Labyrinth design significantly reduces oil pass-through compared to stock plastic breathers, keeping your intake cleaner.

Will this require any carburetor or fuel injection changes?

Installation typically requires no tuning changes — these bolt in as a direct replacement for stock breathers.