S&S Cycle Bore Big Twin Stroker Kit 1936–1999 3 7/16 - 3 1/2 - Manual (Page 3)

3
S&S® FLYWHEEL ASSEMBLY TORQUE SPECIFICATIONS
Stock Harley-Davidson®
Shafts
S&S Shafts (Street) S&S Shafts (Racing)
Big Twin
Sprocket Shaft
290-320 400-450 450-500
Pinion Shaft 140-170 275-300 275-300
Crankpin Nut 180-210 350-400 450-500
Sportster® Model
Sprocket Shaft
100-120 340-360 350-400
Pinion Shaft—pre-1985
Sportster® Models
100-120 180-200 200-250
Pinion Shaft—1985-up
Sportster® Models
100-120 340-360 350-400
Crankpin Nut 150-175 290-310 350-400*
*Using S&S sprocket shaft nut on crankpin
S&S® Flywheel identiFication codeS For 1936-up big twin
Stroke code Stroke year code engine year Sprocket Shaft pinion Shaft crankpin type diameter code Flywheel diameter
1 43⁄8" E 1936-'54 Stock Stock 1941-'81 None 81⁄2" (Stock)
2 41⁄2" L 1955-'71 Stock Stock 1941-'81 A 83⁄8"
3 43⁄4" AL 1972-Early '81 Stock Stock 1941-'81 X 81⁄4"
4 5" SE 1955-Early '81 S&S Stock 1941-'81
5 41⁄4" (Stock 80") BL Late 1981-'99 Stock Stock 1981-'99
6 45⁄8" SL Late 1981-'99 S&S Stock 1981-'99
9 Special order SF 1999-up Press In Press In Press In
12 51⁄4" SG S&S 41⁄8" Bore Press In Press In Press In
13 31⁄2" (Stock 61") SM 1995-'99 EFI Press In S&S 1981-'99
14 331⁄32" (Stock 74") Y 74/80 Indian® Stock Stock Stock
16 51⁄8"
17 4"
18 35⁄8"
19 41⁄8"
TA 37⁄8"
Titan Special
TB 4.450"
FLYWHEEL IDENTIFICATION
Style, stroke, and diameter of S&S® flywheels can be determined by examining the serial number which is stamped on the rim of both flywheels
in the set. Usually the flywheel serial number can be read through the timing plug hole of an assembled engine. Press-together flywheel serial
numbers are stamped on the inside rim of S&S flywheels. A cylinder must be removed in order to read serial number.
S1234-3 SLX
Year of
Manufacture
Engine Style Flywheel
Diameter
Serial Number Flywheel Stroke
All reference to Harley-Davidson® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s products are origi-
nal equipment parts or that they are equivalent to the corresponding Harley-Davidson® part number shown.