What is the purpose of the breather gear and shims in this kit?

The breather gear is part of your motorcycle's final drive system. The included shims allow you to precisely set the spacing of this gear, which is important for proper function and to prevent wear in the drivetrain.

Does this kit include everything needed for installation?

This kit includes the standard size breather gear and a set of shims. You will need to refer to the manufacturer's installation instructions for any additional components or tools required for installation.

What if the breather gear hole in my case has been modified?

This kit is designed for cases where the original breather gear hole has not been modified. If your case has been modified, this standard size replacement gear may not be suitable, and you should consult with a specialist.

S&S Cycle Breather Gear Kit 33-4250 for Big Twin

Name: S&S Cycle 77-99 BT Breather Gear Kit
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-77-99-bt-breather-gear-kit-t14-663074
Price: 169.95 USD
Availability: BackOrder

S&S Cycle 77-99 BT Breather Gear Kit

$169.95

On Backorder — Expected to ship by May 7, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

S&S Cycle 77-99 BT Breather Gear Kit for Big Twin motorcycles.

Key Features

Fits 1977-1999 Big Twin Harley-Davidson motorcycles.
Includes standard size breather gear for unmodified cases.
Comes with eight shims (.100" to .170") for precise gear spacing.
Designed to ensure proper breather gear function in the final drive.

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Will this fit your vehicle?

Product Details

This is the S&S Cycle breather gear kit, designed for 1977 through 1999 Big Twin Harley-Davidson motorcycles. If you're rebuilding the drivetrain on your bike and need to replace the breather gear, this kit offers a standard size replacement that works in cases where the original breather gear hole hasn't been modified. It's a solid option for ensuring proper function in your final drive.

What sets this kit apart is the inclusion of a full set of shims. You get one each of .100", .110", .120", .130", .140", .150", .160", and .170" shims. This allows you to precisely set the spacing for your breather gear, which is crucial for smooth operation and preventing premature wear. Getting this spacing just right is key, and having these options makes the job much more straightforward.

This kit is a direct fit for a wide range of Harley-Davidson models, including popular bikes like the FLHTC Electra Glide Classic, FLSTC Heritage Softail Classic, and FXDL Dyna Low Rider. Make sure to check the full fitment list to confirm it's the right part for your specific motorcycle.