What does the '.010in' designation mean for these piston rings?

The '.010in' indicates that these rings are designed for a cylinder bore that has been machined 0.010 inches larger than its original factory size. This is common when rebuilding an engine to account for wear or to achieve a specific performance setup.

Why are these rings described as 'thin'?

These are a thinner profile than standard factory piston rings. This design choice is often made in performance engine builds for various reasons, such as reducing friction or fitting into specific piston ring land depths.

Can these piston rings be shipped to California?

No, these piston rings are 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 #: 940-0012
UPC: 940-0012

S&S Cycle 1984+ BT 4-1/8in .010in - 2 Pack

Name: S&S Cycle 1984+ BT 4-1/8in .010in - 2 Pack
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-1984-bt-4-1-8in-010in-2-pack-t14-661731
Price: 85.84 USD
Availability: BackOrder

$85.84

On Backorder

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

S&S Cycle .010in piston rings for 1984+ Big Twin engines. A solid option for engine rebuilds.

Key Features

Fits 1984 and newer Big Twin engines.
Designed for a 4-1/8 inch bore that is 0.010 inches oversize.
Thin ring profile for updated engine builds.
Comes as a two-pack, enough for two pistons.
Not CARB approved; cannot ship to California.

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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 thin ring pack is designed for 1984 and newer Big Twin engines, specifically for a 4-1/8 inch bore that's been machined to be 0.010 inches oversize. If you're rebuilding the top end of your engine and need to replace worn piston rings, this set is a practical choice.

These rings are a thinner profile than stock, which can be part of an updated engine build. They come in a two-pack, meaning you get enough rings for two pistons. It's important to note that these are not CARB approved, so they cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly.