S&S 1250 Big Bore Kit For Harley Sportster 1986-2018
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  • S&S 1250 Big Bore Kit For Harley Sportster 1986-2018 - 10.3:1 Compression Ratio
  • S&S 1250 Big Bore Kit For Harley Sportster 1986-2018 - 10.3:1 Compression Ratio
  • S&S 1250 Big Bore Kit For Harley Sportster 1986-2018 - 11.2:1 Compression Ratio
  • S&S 1250 Big Bore Kit For Harley Sportster 1986-2018 - 11.2:1 Compression Ratio

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Video Reviews (2)

S&S 1250 Big Bore Kit For Harley Sportster 1986-2018 Videos

S&S 1250 Big Bore Kit For Harley Sportster 

This kit converts 1200cc HD Sportster models to 1250cc displacement. No machining or rebalancing is required. Forged pistons have larger than stock valve pockets and accept up to 2.00" valves. 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.

Features:

  • 10.3:1 Flat Top Pistons
  • 11.2:1 5.5cc Domed Pistons
  • Available in silver powder coat or wrinkle black powder coat finish
  • Made in the USA

Fitment Notes & Exceptions

  • Will also fit 883 models with the use of XL1200 cylinder heads to achieve correct compression ratios
This Product Fits:
Harley Davidson
Sportster Custom XL1200C 19962018
Sportster Forty-Eight XL1200X 20102018
Sportster Low XL1200L 20062011
Sportster Nightster XL1200N 20072012
Sportster Roadster XL1200CX 2016, 2017, 2018
Sportster Roadster XL1200R 2004, 2005, 2006, 2007, 2008
Sportster Seventy-Two XL1200V 2012, 2013, 2014, 2015, 2016
Sportster Sport XL1200S 19962003
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Sportster XLH1200 19882003
XR1200/XR1200X 2009, 2010, 2011, 2012
Product Style RevZilla Item # Manufacturer Product # Availability
10.3:1 Compression Ratio / Black 1181564 910-0443 Available: Requires 1-3 business days lead time prior to shipment
10.3:1 Compression Ratio / Silver 1181565 910-0433 Only 3 Left: Ships within 24 hours
11.2:1 Compression Ratio / Black 1181566 910-0446 In Stock: Ships within 24 hours
11.2:1 Compression Ratio / Silver 1181567 910-0436 Only 1 Left: Ships within 24 hours

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