What kind of machining is required for this stroker kit?

The primary machining required is boring your stock 88 cubic inch cylinders from a 3-3/4 inch bore to a 3-7/8 inch bore to accommodate the S&S pistons. Alternatively, you can install a pre-fit S&S cylinder and piston kit.

Will I need to adjust my fuel system after installing this kit?

Yes, if your engine is fuel injected, you will need to recalibrate the fuel injection system after installing this stroker kit. This ensures the engine runs optimally with the increased displacement.

What crankcase configurations does this kit work with?

This stroker kit is intended for pre-2003 crankcases that feature a Timken right main bearing. It will also fit crankcases that have been upgraded with a Timken bearing kit.

Specifications

Brand: S&S Cycle
Part #: 320-0460
UPC: 320-0460

S&S Cycle 99-06 BT 106in Stock Bore Stroker Kit w/o Sprocket Bearing

Name: S&S Cycle 99-06 BT 106in Stock Bore Stroker Kit w/o Sprocket Bearing
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-99-06-bt-106in-stock-bore-stroker-kit-w-o-sprocket-bearing-t14-662868
Price: 1713.80 USD
Availability: BackOrder

$1713.80

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 99-06 BT 106in Stock Bore Stroker Kit w/o Sprocket Bearing. Increases engine displacement without special machining.

Key Features

This kit increases your engine's displacement to 106 cubic inches.
It allows stock 88 cubic inch cylinders to be bored from 3-3/4 inch bore to 3-7/8 inch to fit the S&S pistons.
The kit is designed for pre-2003 crankcases with Timken right main bearings or those upgraded with a Timken bearing.
S&S stroker pistons are available in all standard oversizes for a tailored fit.
Fuel injected engines will require recalibration of the fuel injection system after installation.
This kit can be used with either stock or S&S cylinder heads.

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About this part

Product Details

If you're looking to get more power out of your 1999-2006 Big Twin engine, this stock bore stroker kit from S&S Cycle is a solid option. It's designed to increase your engine's displacement to 106 cubic inches, giving you a noticeable boost in torque and horsepower without requiring extensive machining. The kit is built around S&S pistons, which are available in standard oversizes, meaning you can tailor the fit to your specific engine build. This kit is a great way to get more performance from your existing cylinders, as they can be bored out to accommodate the larger S&S pistons.

This stroker kit is engineered to work with pre-2003 crankcases that have a Timken right main bearing, or those that have been upgraded to a Timken bearing. You can use your stock cylinder heads or S&S cylinder heads with this kit. Keep in mind that if you have a fuel-injected engine, you'll need to recalibrate your fuel injection system after installation to ensure optimal performance. While this kit offers a significant performance improvement, it's important to note that it is not CARB approved and cannot be shipped to California.