Big Bore Kits

The aluminum casting, 1200cc cylinder is cast iron sleeved with an external rib that locks it in place and makes for a great replacement for XL 1200 models, or basic start to upgrading your 883.

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal, and include just about everything you’ll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining.

S&S Cycle 107″ Big Bore Kit

Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt-in kits do not require machining, rebalancing or engine removal, and include just about everything you’ll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining.

This big bore cylinder and piston kit can be used as replacement for the cylinders and pistons for an S&S 124″ Hot Set Up Kit, a T124 T2 engine or as the basis for a new engine build. Kit contains S&S 4-1/8″ bore cylinders and forged flat dome pistons, rings, wrist pins, head and base gaskets. The cylinders are machined with the stock bolt pattern and are intended for use in stock crankcases of 2007-16 big twin engines. This kit must be used with 4-5/8″ flywheels resulting in 124″ displacement.

Maximize your M8 motor’s potential with the ultimate bore size upgrade that requires no case machining. This all-inclusive kit simplifies the pathway to significant power enhancement, ensuring a straightforward installation process.

Turn your 114 cubic inch Milwaukee Eight into a 132 cubic inch monster. S&S Cycle has done it again with their bolt-on big bore kit featuring a 4.32” bore and 11:1 compression ratio. This cylinder and piston kit will accommodate a high lift cam and keep your Harley-Davidson M8 happy on pump gas. No case mods, no engine removal; just a massive set of jugs, designed, tested, and manufactured here in the USA.

S&S Cycle 74″ Top End Kit

S&S Cycle 80″ Top End Kit

Maybe you need more power from your 883. Maybe you’re a handy type who realized he could buy an 883 and a big-bore kit cheaper than he could buy a 1200 Sportster. Whatever the reason you’re contemplating enlarging your engine, know that S&S has got you covered with a high-quality kit that makes the job a snap.

S&S Cycle 95″ Cylinder and Piston Kit For Harley Twin Cam

S&S 98″ Big Bore Kit For Harley Big Twin

The High-Compression 136 and 132 Big-Bore Kits enhance motorcycle performance significantly, providing increased torque and horsepower alongside a more aggressive throttle response. These kits represent the largest bolt-on options available and function seamlessly with standard crankcases, avoiding the need for machining and maintaining original engine serial numbers. The factory-matching powder coat finish contributes to a sleek appearance while ensuring simple installation through retaining the factory engine height. Each kit includes gaskets to facilitate the upgrade process. Designed for those looking to unlock additional performance and power, the 136 and 132 Big-Bore Kits deliver a thrilling riding experience.