V-Twin 1270cc Cylinder and Piston Conversion Kit for Harley-Davidson XL

Upgrade your Harley-Davidson XL from 1200cc to 1270cc with a no-machining big-bore kit that includes two pre-fitted, silver-finished cylinders and forged pistons with moly rings. A compression ratio of 10.1:1 is designed to balance power and reliability, and a head gasket is included for a complete upgrade.

The cylinders are precision honed to a bore of approximately 3.5995 to 3.6005 inches, delivering a precise fit and improved combustion efficiency thanks to pistons with Teflon-coated tops.

Designed specifically for converting 1200cc models to 1270cc, with a flat piston set tailored explicitly for 1200cc models to maintain compatibility and reliability. No machining required—pre-fitted cylinders and a complete hardware kit streamline installation. Crafted in Taiwan for Harley-Davidson XL models listed in the product data.

Compatibility and fitment

Fitment: Harley Davidson XL 1986 through 1995. The product data also lists compatibility with XL models through 2003 in the official specifications.

• Includes two silver-finished cylinders
• Forged pistons with moly rings
• Compression ratio: 10.1:1
• Bore size: approximately 3.5995–3.6005 inches
• Pistons with Teflon-coated tops
• No machining required; pre-fitted cylinders
• Flat piston set tailored for 1200cc models
• Made in Taiwan
• Recommended pairing: cylinder head gasket set, piston ring set

Big bore cylinder kit for 1200-1270cc conversion on Sportster models. Kit includes head gasket and has a compression ratio of 10.1.

Enhance your Harley-Davidson XL engine performance with the V-Twin 1270cc Cylinder and Piston Conversion Kit. This comprehensive kit includes two pre-fitted silver-finished cylinders, forged pistons with moly rings, and all necessary components for an easy upgrade. Designed specifically for converting 1200cc models to 1270cc, the kit ensures a seamless installation without the need for machining. The cylinders are finished with precision on our specialized honing machine, providing a bore size of approximately 3.5995 to 3.6005 inches, ensuring optimal fit and performance. The forged pistons feature Teflon-coated tops to promote more complete combustion, contributing to increased horsepower and efficiency. The included flat piston set is tailored explicitly for 1200cc models, making this kit ideal for riders looking to boost their engine's power while maintaining reliable performance. Whether you're restoring an older model or seeking a performance upgrade, this kit offers a straightforward solution to achieve higher displacement and improved engine output. Crafted in Taiwan, this high-quality conversion kit is compatible with Harley-Davidson XL models from 1986 to 1995, providing a durable and precise fit for your motorcycle. Pair it with our recommended accessories, such as the cylinder head gasket set and piston ring set, for a complete upgrade experience. Invest in the V-Twin 1270cc Cylinder and Piston Conversion Kit to unlock your motorcycle's full potential and enjoy enhanced riding performance.

Features:

• Includes two silver-finished cylinders, forged pistons, and moly rings for a complete upgrade

• Designed specifically for converting 1200cc Harley-Davidson XL models to 1270cc

• No machining required; cylinders are pre-fitted and finished on a precision honing machine

• Forged pistons with Teflon-coated tops for improved combustion efficiency

• Compatible with Harley-Davidson XL models from 1986 to 1995

Fitment:
Harley Davidson XL 1986
Harley Davidson XL 1987
Harley Davidson XL 1988
Harley Davidson XL 1989
Harley Davidson XL 1990
Harley Davidson XL 1991
Harley Davidson XL 1992
Harley Davidson XL 1993
Harley Davidson XL 1994
Harley Davidson XL 1995
Harley Davidson XL 1996
Harley Davidson XL 1997
Harley Davidson XL 1998
Harley Davidson XL 1999
Harley Davidson XL 2000
Harley Davidson XL 2001
Harley Davidson XL 2002
Harley Davidson XL 2003