Std Pistons with 9.5:1 Compression Ratio. Fits Big Twin 1999-2006 with 88ci to 98ci Big Bore Twin Cam Engine. - CP Carrillo Pistons Transmission - BT 6 spd era * Replaces OEM # 31553-90

* Replaces OEM # 31553-90

XL883N 2009up

use # KM-KUS11600

* 2006 Dyna can be upgraded to 2007 Specifications by using the 2007 Stator CE-8010-07 plus the 2007 Rotor CE-0700

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Std Pistons with 9.5:1 Compression Ratio. Fits Big Twin 1999-2006 with 88ci to 98ci Big Bore Twin Cam Engine. - CP Carrillo Pistons Transmission - BT 6 spd era * Replaces OEM # 31553-90Features & Benefits: * Bore = 3. 937 * Stroke = 4. 000 * Fully CNC machined * Balanced to + 1 gram * Double forced pin oilers * Forged from high strength 2618 alloy * Designed for maximum performance, horsepower and reliability * Complete kit includes two pistons, ring sets, wrist pins and clips Tech Tips: * Suggested additional purchase head gaskets # CG C10083 045 * Follow ring end gap and piston to cylinder clearances as per the supplied