S&S Cycle - S&S Performance Parts 2025 L - Volume 67

2017-UP

Phone: 608-627-1497

1 2017-UP 2 -2007-'17 3 -1999-'06 4 -1984-'99 5 -1936-'84 6 -XL-RA1250 7 -BELTS & GASKETS 8 -TOOLS 9 -WARRANTY 10 -APPENDIX

The crankshaft is the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades Stronger, more durable, and trued to a spec others can only dream of, our new crankshaft assemblies for the Milwaukee-Eight® platform are the best of the best to build your high performance engine around

Features And Benefits: • Available in 43/8”, 41/2” & 45/8” Stroke • Comes with balance gear installed for easy installation • Heat Treated 4140 Material is harder & more than twice as strong as stock • Stronger assembly eliminates need to weld crankpin • S&S High Strength Forged Connecting Rods are designed with Finite Element Analysis to eliminate weak spots and handle more power! • Full width connecting rods have more material to handle higher stress • Perfect for Gear Drive Cams • Consistent balance & precision machining • Capable of higher RPM — More available power!

S&S does not recommend compression ratios higher than 10:1 for Tri Glide® or other three wheel models (including conversions) due to extra loads caused by the lugging nature of these bikes Detonation and subsequent engine damage may result

Flywheel Assemblies For 2017–Up M8 Models Displacement (with S&S cylinders & pistons) Stroke

Connecting Rod Length

Balanced to Total Piston Weight (gms)

Compression Ratio

Part #

†

107 or 124” 114 or 128”

4 3/8” 4 ”

9 9

1060 1060

8 015 8 015

320-0601 (tapered rods) 320-0598 (tapered rods)

10 3

107 or 124" †† 114 or 128" †† 131" or 136” ††

4 3/8" 4 " 4 5/8"

10 8 10 8 10 8

1213 1213 1213

8 015 8 015 7 953

320-0604 (full wristpin rods) 320-0603 (full wristpin rods) 320-0605 (full wristpin rods)

†† Will Not Work With Stock HD® Pistons NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. NOT LEGAL FOR SALE OR USE NATIONWIDE ON ANY FEDERAL POLLUTION CONTROLLED MOTOR VEHICLE UNDER THE CLEAN AIR ACT

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