Std Dome Top Pistons with 10.5:1 Compression Ratio. Fits Twin Cam 1999-2006 with Big Bore 88ci to 95ci Conversion. - Keith Black Pistons Transmission Externals BT 4 spd era * All models require mirror

* All models require mirror extenders or mirrors to be run on controls

more durable

* Fits FXBR Breakout 2018up

* Includes throttle sleeves

Std Dome Top Pistons with 10.5:1 Compression Ratio. Fits Twin Cam 1999-2006 with Big Bore 88ci to 95ci Conversion. - Keith Black Pistons Transmission Externals BT 4 spd era * All models require mirrorFeatures & Benefits: * Bore=3. 875 * Stroke=4. 000 * Hypereutectic Alloy is a cast 16% silicon content material * Perfect for air cooled engines * Low thermal expansion rate = tighter piston to cylinder clearance * Complete kit includes: two pistons, rings, wrist pins and clips. Tech Tips: * 10. 5: 1 Compression Ratio with 85cc Head Chamber Volume. * Follow Ring End Gap & Piston to Cylinder Clearances as per the supplied Manufacturers Instructions. *