Flywheels

Darkhorse excusive line of parts, supports the ever-growing need for big horsepower and torque. Our H-Beam Chromoly connecting rods are second to none. Product options include our inexpensive competition rods (made with imported forgings), to our impressive “Made in the USA” forgings and Carrillo-made connecting rods.  Centerlines are machined to within .0003” of each other. They are the only rod that can provide you a true .001” stack-up tolerance which is quickly becoming industry standard. Darkhorse's innovative Pro-Plug System is often copied, but never duplicated. Our system far outperforms welding alone. It is is truly the cornerstone of our success and reputation.  All our proprietary bearings and races are now available exclusively through Darkhorse. Our precision balancing method has proved to our dealers, and their customers, the benefits of a properly balanced crankshaft from Darkhorse Crankworks. Since 1980, we have been perfecting our processes, constantly reviewing and improving. This method equates to the smoothest crankshafts in America. Since 1980, we have performed extensive testing on crankshaft balancing and conducted vibration analysis. We have concluded that the most important unit of measure is runout at each main bearing race. Runout measured at the end of each shaft is a byproduct of those measurements.

S&S Early Cases Features: Cast from A356 T-6 heat-treated aluminum alloy Include crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, top end oil screen spring and plug, sprocket shaft Timken® bearing assembly, oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump shaft bushings and installation instructions Use Timken style sprocket shaft bearings and 1958 and later pinion bearings (will not accept 1957 and earlier flywheels) Bearing races are all line honed and breather cavity is precision machined to optimize breather timing for maximum oil scavenging Machined for 3.4375" cylinders and tapped 1/4"-20 for gear covers, oil pump, tappet guides, timer and timer advance 65 models use 65 alloy inner primary Drilled for 5/16" generator mounting bolts 63-65 models with outside oil lines must use oil port to the rear of the tappet block or oil port in gear cover and use custom oil lines Generator crankcase gear kit (includes circuit breaker drive gear, idler gear, circuit breaker gear and shims) and shafts must be purchased separately Made in the U.S.A.

S&S Twin Cam Engine Cases Features: Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI) Feature greater overall strength than stock crankcases Strong, dependable Timken®-style sprocket shaft bearings Clearanced for strokes up to and including 5" All passages between the crankcase cam support plate are O-ring sealed Compatible with most stock components Cam chest has clearance for up to .675" lift cams Include S&S crankcase breather reed valve designed to eliminate oil carry-over and oil scavenging problems Rear motor mount bolts directly to the stock transmission; fully compatible with the stock primary, charging system, and other stock components Made in the U.S.A. This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.

S&S Flywheel Assembly For Harley Milwaukee 8 The flywheels are 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, the new cranks for the Milwaukee-Eight platform are the best of the best to build your high performance engine around. Features: Heat treated 4140 material is harder & more than twice as strong as stock Stronger assembly eliminates need to weld crankpin Capable of higher RPM - More available power S&S High strength connecting rods are designed with Finite Element Analysis to eliminate weak spots and handle more power Perfect for gear drive cams 4-1/2" Stroke (114 or 128ci) 4-3/8" Stroke (107 or 124ci) 4-5/8" Stroke - Use S&S 131 Kits Note: Full width wristpin connecting rods require performance pistons / Tapered wristpin connecting rods compatible with stock pistons

S&S Flywheel Assemblies for Twin Cam Motors The flywheels are 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. Available with tapered connecting rods for stock style pistons or with full width connecting rods for S&S performance pistons. Three piece design with integral main shafts made from 4140 steel. Features: Heavy duty connecting rods Pinion and sprocket shafts are forged as part of the flywheel CNC machined from heat-treated, closed die, steel forgings, which are 114% stronger than late style stock steel flywheels Dynamically balanced Trued to less than .0005" runout on pinion and sprocket shaft bearing surfaces Capable of higher rpm Fully compatible with gear drive cams Made in the USA