S&S large capacity piston kit, M8 114" to 128". Standard

Compression ratio 11.1:1. The piston kit includes forged pistons, rings, pins and retainers. The crankcases do not require boring. 4.250" big bore cylinders are required; OEM cylinders cannot be bored to 4.250". The 117" to 128" pistons come with a 1.0805" deck height and are compatible with the OEM 4.500" stroke.
Note: See S&S 574121 (textured black) or 547122 (textured black with highlighted fins) for 4.250" big bore cylinders only.
Note: Gaskets are sold separately as head gaskets 591055, base gaskets 591054 or head and base gasket kit 591056.
Note: S&S recommends an S&S 550 series cam, available with either chain or gear drive.
Note: In all applications, the technician must be able to evaluate the components to determine their suitability in combination with the other engine components, prior to installation. It is important that a qualified mechanic installs and makes the necessary adjustments. The rider must follow standard running-in and riding procedures for rebuilt engines.


Specifications


Brand
S&S


Application
18-24 114"/117" Softail; 17-25 114" FLT/Touring/117" FLT/Touring (excl. 23-25 CVO; 24-25 FLTRX; 24-25 FLHX; 2025 FLHXU) (NU)


Sales unit
Kit


Material
Steel


Packaging weight
1.461 kg


HS Code
84099100


Motorcycle family
SOFTAIL, TOURING, TRIKE


Original name
S&S, M8 114" to 128" big bore piston kit. Std