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

The '.010in' indicates that these rings are 0.010 inches larger than the standard size. This means they are intended for use in cylinders that have been bored out to this specific oversize dimension during an engine rebuild.

What is the primary function of piston rings?

Piston rings have three main jobs: they seal the combustion chamber to maintain compression, they scrape excess oil from the cylinder walls to prevent it from entering the combustion chamber, and they help transfer heat from the piston to the cylinder wall for cooling.

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Specifications

Brand: S&S Cycle
Part #: 94-1221X
UPC: 94-1221X

S&S Cycle 66-99 BT 3-5/8in Piston Ring Set - .010in

Name: S&S Cycle 66-99 BT 3-5/8in Piston Ring Set - .010in
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-66-99-bt-3-5-8in-piston-ring-set-010in-t14-662392
Price: 55.53 USD
Availability: BackOrder

$55.53

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S&S Cycle Big Twin piston ring set, .010 inch size. Direct fit for 66-99 Big Twin engines.

Key Features

Fits 1966-1999 Big Twin engines.
Piston ring set measures 3-5/8 inches in diameter.
This set is .010 inch oversize, intended for bored cylinders.
Made by S&S Cycle, a popular name in V-twin engine components.

This piston ring set is designed for 1966-1999 Big Twin engines. It is .010 inch oversize and intended for cylinders that have been bored to match this dimension.

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About this part

Product Details

This is a .010 inch piston ring set from S&S Cycle, made for 1966-1999 Big Twin engines. Piston rings are crucial for sealing the combustion chamber, controlling oil consumption, and transferring heat from the piston to the cylinder wall. When you're rebuilding or refreshing the top end of your Big Twin, a fresh set of rings ensures proper compression and oil control.

S&S Cycle is well-known for making solid engine components for Harley-Davidson and other V-twin applications. This set is specifically sized at .010 inch oversize, meaning it's intended for cylinders that have been bored out to match this dimension. Using the correct oversize rings is essential for achieving a good seal and preventing premature wear in a freshly bored engine.

Keep in mind that this part is not CARB approved and cannot be shipped to California. Always refer to your service manual for proper installation procedures and specifications.