S&S Cycle 86-21 Sportster Models 1250cc Conversion Kit - Wrinkle Black

This kit converts 1986-'21 883cc and 1200cc HD Sportster models to 1250cc displacement. No machining or rebalancing is required. Kit contains forged flat topped 3-9/16" bore pistons with coated piston skirts, S&S 3-9/16" bore cylinders, MLS head gaskets, base gaskets, exhaust gaskets, assembly lube, and instructions. 883 cylinder heads may not be used with this kit. For the best performance CNC head porting, performance cams, exhaust and intake upgrades are recommended.

Upgrade compatible 1986-2021 Harley-Davidson Sportster 883cc and 1200cc models with the S&S Cycle 910-0691 1250cc Conversion Kit. Designed to increase engine displacement without machining or crankshaft rebalancing, this kit provides a practical foundation for improved torque and overall engine performance.

The kit includes forged flat-top 3-9/16-inch-bore pistons with coated skirts, S&S 3-9/16-inch-bore cylinders, MLS head gaskets, base gaskets, exhaust gaskets, assembly lube, and installation instructions. The supplied components are designed to support a complete conversion while helping simplify installation. This kit is finished in wrinkle black for a distinctive appearance that complements many Sportster engine builds.

For optimal results, S&S Cycle recommends combining the conversion with CNC head porting, performance camshafts, exhaust upgrades, and intake improvements. The original 883 cylinder heads are not compatible with this kit, so verify cylinder head compatibility and all supporting engine components before installation. The kit is intended for powersports applications and is not emissions compliant for use on pollution-controlled motor vehicles. Check applicable regulations and confirm vehicle fitment before purchase.

Fitment includes select Harley-Davidson Sportster models such as the XL883N Iron 883, XL1200X Forty-Eight, XL1200V Seventy-Two, and XL883L SuperLow. Always verify the exact model year, engine configuration, and required supporting components before ordering or beginning installation.

Features:

• 1250cc displacement conversion for compatible 1986-2021 Harley-Davidson Sportster 883cc and 1200cc models
• No machining or engine rebalancing required for installation
• Forged flat-top 3-9/16-inch-bore pistons with coated piston skirts
• S&S 3-9/16-inch-bore wrinkle-black cylinders
• Includes MLS head gaskets, base gaskets, exhaust gaskets, assembly lube, and instructions
• 883 cylinder heads are not compatible with this conversion kit
• Performance upgrades such as CNC head porting, cams, exhaust, and intake components are recommended
• Not emissions compliant for use on pollution-controlled motor vehicles

Fitment:
Harley Davidson XL1200V Seventy-Two Base 2012
Harley Davidson XL1200V Seventy-Two Base 2013
Harley Davidson XL1200V Seventy-Two Base 2014
Harley Davidson XL1200V Seventy-Two Base 2015
Harley Davidson XL1200V Seventy-Two Base 2016
Harley Davidson XL1200X Forty-Eight Base 2010
Harley Davidson XL1200X Forty-Eight Base 2011
Harley Davidson XL1200X Forty-Eight Base 2012
Harley Davidson XL1200X Forty-Eight Base 2013
Harley Davidson XL1200X Forty-Eight Base 2014
Harley Davidson XL1200X Forty-Eight Base 2015
Harley Davidson XL1200X Forty-Eight Base 2016
Harley Davidson XL1200X Forty-Eight Base 2017
Harley Davidson XL1200X Forty-Eight Base 2018
Harley Davidson XL1200X Forty-Eight Base 2019
Harley Davidson XL1200X Forty-Eight Base 2020
Harley Davidson XL883L SuperLow Base 2012
Harley Davidson XL883L SuperLow Base 2013
Harley Davidson XL883L SuperLow Base 2014
Harley Davidson XL883L SuperLow Base 2015
Harley Davidson XL883L SuperLow Base 2016
Harley Davidson XL883L SuperLow Base 2017
Harley Davidson XL883L SuperLow Base 2018
Harley Davidson XL883L SuperLow Base 2019
Harley Davidson XL883N Iron 883 Base 2009
Harley Davidson XL883N Iron 883 Base 2010
Harley Davidson XL883N Iron 883 Base 2011
Harley Davidson XL883N Iron 883 Base 2012
Harley Davidson XL883N Iron 883 Base 2013
Harley Davidson XL883N Iron 883 Base 2014
Harley Davidson XL883N Iron 883 Base 2015
Harley Davidson XL883N Iron 883 Base 2016
Harley Davidson XL883N Iron 883 Base 2017
Harley Davidson XL883N Iron 883 Base 2018
Harley Davidson XL883N Iron 883 Base 2019
Harley Davidson XL883N Iron 883 Base 2020
Harley Davidson XLH1100 Base 1986
Harley Davidson XLH1100 Base 1987
Harley Davidson XLH1200 Base 1988
Harley Davidson XLH1200 Base 1989
Harley Davidson XLH1200 Base 1990
Harley Davidson XLH1200 Base 1991
Harley Davidson XLH1200 Base 1992
Harley Davidson XLH1200 Base 1993
Harley Davidson XLH1200 Base 1994
Harley Davidson XLH1200 Base 1995
Harley Davidson XLH1200 Base 1996
Harley Davidson XLH1200 Base 1997
Harley Davidson XLH1200 Base 1998
Harley Davidson XLH1200 Base 1999
Harley Davidson XLH1200 Base 2000
Harley Davidson XLH1200 Base 2001
Harley Davidson XLH1200 Base 2002
Harley Davidson XLH1200 Base 2003
Harley Davidson XLH883 Base 1986
Harley Davidson XLH883 Base 1987
Harley Davidson XLH883 Base 1988
Harley Davidson XLH883 Base 1989
Harley Davidson XLH883 Base 1990
Harley Davidson XLH883 Base 1991
Harley Davidson XLH883 Base 1992
Harley Davidson XLH883 Base 1993
Harley Davidson XLH883 Base 1994
Harley Davidson XLH883 Base 1995
Harley Davidson XLH883 Base 1996
Harley Davidson XLH883 Base 1997
Harley Davidson XLH883 Base 1998
Harley Davidson XLH883 Base 1999
Harley Davidson XLH883 Base 2000
Harley Davidson XLH883 Base 2001
Harley Davidson XLH883 Base 2002
Harley Davidson XLH883 Base 2003
Harley Davidson XLH883 Base 2004