S&S, long stroke 3-7/16" forged piston kit. +.070"

Forged piston set. For 41-78 1200cc (74") Knuckle, Panhead and Shovel engines, and 1340cc Shovel. Compatible with engines using long-stroke flywheels and standard 3-7/16" (1200cc) or 3-1/2" (1340cc) cylinders with a 5.330" length. The compression ratio will be approximately 8.4:1 with a 4-1/2" stroke, 9.4:1 with a 4-5/8" stroke and 10.8:1 with a 4-3/4" stroke. Piston dome volume: 50cc. Advanced alloy and piston skirt profile for low noise and long engine life. The pistons include wrist pins, pin retainers and piston rings.
Note: The 3-7/16" (+.060") bore of the 1200cc engine is identical to the 3-1/2" standard bore of the 1340cc engine.
Note: In all applications, the technician must be able to assess the suitability of the components in combination with the other engine components before installation. It is important that a qualified mechanic installs and carries out the necessary adjustments. The rider must follow standard running-in and riding procedures for rebuilt engines.


Specifications


Brand
S&S


Application
41-84 Big Twin with 84" (4-1/2" stroke), 86" (4-5/8" stroke) & 88" (4-3/4" stroke) engines (NU)


Sales unit
Set


Material
Aluminium


Packaging weight
1.355 kg


HS Code
84099100


Motorcycle family
BIG TWIN, FX, FXR, SOFTAIL, TOURING


Original name
S&S, 3-7/16" forged stroker piston kit. +.070"