S&S, 3-7/16" diameter 9:1CR piston kit. Standard

The standard replacement was 8:1 (46cc dome); these come with a 9:1 compression ratio (57cc dome) for a little more power. Forged S&S pistons with advanced alloy and skirt profiles, resulting in a quiet, long-lasting engine, previously only achievable with cast pistons. Used as a replacement, with a higher compression ratio, for 1200cc (74") Shovel, Pan and Knucklehead models. 3-7/16" bore with standard 3-31/32" stroke. Pistons include wrist pins, pin locks and piston rings.
Note: S&S piston fitting recommendations: Tight fit .0030" to .0035", loose fit .004" to .005".
Note: In all applications, the technician must be able to assess the components to determine their suitability in combination with the other engine components, prior to installation. It is important that a skilled mechanic carries out the installation and any necessary adjustments. The rider must follow standard running-in and riding procedures for rebuilt engines.


Specifications


Brand
S&S


Application
41-78 1200cc/74" Knuckle, Pan, Shovel (NU)


Sales unit
Set


Material
Aluminium


Packaging weight
1.36 kg


HS Code
84099100


Motorcycle family
BIG TWIN, FX, TOURING


Original name
S&S, 3-7/16" bore 9:1CR piston kit. Std