What is the purpose of an exhaust valve seat?

An exhaust valve seat is a metal ring fitted into the cylinder head that the exhaust valve closes against. Its job is to create a tight seal when the valve is shut, which is essential for maintaining compression and preventing exhaust gases from leaking out.

What does the 1.575-inch diameter refer to?

The 1.575-inch diameter is the measurement of the sealing surface where the exhaust valve makes contact. This specific size is designed to match the original equipment specifications for 1999 and newer Big Twin Harley-Davidson engines.

Can this part be shipped to California?

No, this part is not CARB approved and cannot be shipped to California due to emissions regulations.

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Trusted Since 1957

Est. 1957

Specifications

Brand: S&S Cycle
Part #: 90-2028
UPC: 90-2028

S&S Cycle 1999+ BT 1.575in Exhaust Seat

Name: S&S Cycle 1999+ BT 1.575in Exhaust Seat
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-1999-bt-1-575in-exhaust-seat-t14-664607
Price: 28.24 USD
Availability: BackOrder

$28.24

On Backorder

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

Key Features

Fits 1999 and newer Big Twin Harley-Davidson models.
Exhaust valve seat with a 1.575-inch diameter.
Direct replacement for original equipment.
Helps maintain proper engine compression and prevent exhaust leaks.

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About this part

Product Details

S&S Cycle is well-known for making performance engine parts for Harley-Davidson motorcycles. This exhaust valve seat is a direct replacement part for 1999 and newer Big Twin models. It's designed to properly seal the exhaust port when the valve is closed, which is crucial for engine performance and efficiency.

This particular seat has a 1.575-inch diameter, matching the original equipment specifications for the intended applications. When rebuilding or repairing the cylinder head on your Big Twin, ensuring you have a well-made valve seat like this one helps maintain proper compression and prevents exhaust leaks. It's a small but important component for the overall health of your engine.