Flywheel Assembly - 4-5/8" Stroke - Full Wrist Pin - 131" M8 Perfect for gear drive camshafts, Consistent balance and precision machining, Balance gear is installed for easy installation, Strong assembly eliminates need to weld crankpin, Heat treated 4140 material is harder and twice as stong as stock, Connecting rods are designed with Finite Element Analysis (FEA) to eliminate weak spots , Includes flywheel, crankpin and connecting rods, Made in the USA, Not recommended for compression ratios higher that 10.0:1 for Tri Glide or other three wheel models (including conversion)., Displacement is with S&S cylinders and pistons.
This is the required flywheel assembly for the S&S 136" Big Bore Cylinder Kit. The stock Harley flywheel will not work with the 136" kit — you must use this S&S 4-5/8" stroker flywheel.
Made from heat-treated 4140 material that's over twice as strong as stock, this assembly includes the balancer gear installed, high-strength full wrist pin connecting rods, and a crankpin. No welding required on the crankpin. It's precision balanced and built for high RPM and maximum power.
Key specs: 4-5/8" stroke, full wrist pin rods, includes balancer gear. Made in the USA.
Important Notes:
- Required for S&S 136" cylinder kit (910-0849A)
- Not compatible with stock Harley-Davidson pistons
- Not recommended for Trike models
- Not legal for use on pollution-controlled vehicles in California
Fitment: 2017-up Harley-Davidson Milwaukee-Eight Touring and 2018-up Softail models (non-VVT).
