S&S, 3-5/8". +.060" forged big bore piston kit

Compatible with all 3-5/8" big bore 36-84 B.T. models with flywheels from 4-1/4" to 5" stroke and the correct 8-1/2 diameter. Note that 4-3/4" and 5" strokes require small 8-1/4 diameter flywheels, all in combination with the correct cylinder length as indicated below. Advanced alloy and piston skirt profile used for low noise and long engine life. Piston dome volume 30cc, piston deck height 1.260".
88" (4-1/4" stroke, 8-1/2" flywheel diameter, 8.5:1 compression ratio, 5.330" cylinder length).
93" (4-1/2" stroke, 8-1/2" flywheel diameter, 8.5:1 compression ratio, 5.405" cylinder length).
93" HC (4-1/2" stroke, 8-1/2" flywheel diameter, 9.1:1 compression ratio, 5.363" cylinder length).
96" (4-5/8" stroke, 8-1/2" flywheel diameter, 9.1:1 compression ratio, 5.440" cylinder length).
98" (4-3/4" stroke, 8-1/4" flywheel diameter, 8.9:1 compression ratio, 5.530" cylinder length).
103" (5" stroke, 8-1/4" flywheel diameter, 9.7:1 compression ratio, 5.630" cylinder length).
The pistons include wrist pin, pin retainers and piston rings.
Note: For a higher compression ratio, S&S recommends shortening the cylinders. Shortening the cylinder by .060" will produce an approximate 1 point increase in the compression ratio.
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
36-84 88", 93", 93"HC, 96", 98" and 103" Big Twin with appropriate cylinders and flywheel stroke (NU)


Sales unit
Set


Material
Steel


Packaging weight
1.4 kg


HS Code
84099100


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


Original name
S&S, forged 3-5/8" big bore piston kit. +.060"