Dark horse flywheel 4.3

Dark horse flywheel 4.3 Online – Harley Davidson Bike Store is a high-strength crankshaft assembly designed for Harley-Davidson Twin Cam engines, specifically 2007–2016 A-Model Twin Cams.

Key Specifications

• Stroke: 4.375″ (4-3/8”)

• Material: Hot-forged 4140 steel, precision-machined and heat-treated

• Connecting Rods: Chromoly competition rods, crankpin, and bearing kit

• Balance: Dynamically balanced for 103” – 117” big bore builds (approx. 1035g rod weight ± 20g)

• Build Type: Built-to-order (2–6 weeks lead time after ordering and build form submission)

• Pro-Plug System: Proprietary weld system to prevent crank twisting or scissoring

Rider Feedback & Community Experience

• V‑Twin Forum discussions highlight turn times around 2–3 weeks

• On Reddit/r/Harley, one user emphasized:

  “Without a doubt if you plan on big hp and sketchy riding. You’ll get bearing upgrades as well.”

  Why Choose the 4‑3/8″ Man O’ War?

• Rock-solid construction: Designed for high-stress applications; no known failures due to the Pro‑Plug system

• Precision balancing: Optimized for larger bore pistons, ensuring smooth RPMs and peak performance

• Gear-cam ready: Ideal if you’re running gear-drive camshafts without compromising integrity

• Proven rider satisfaction: Notable improvements in clutch feel, shifting smoothness, and noise reduction.

Ideal If You’re

• Building a 103″–117″ big-bore TwinCam machine

• Running a gear-driven cam system

• Seeking durability for racing or aggressive street use

• Looking to improve clutch/compensator refinement

Next Steps

• Order Preparation: Complete your build specs and rod/piston details via the Darkhorse build form

• Estimated Delivery: Typically 2–6 weeks turnaround

• Installation Tips: Use recommended Timken main bearings, verify bearing race fitment, and ensure precise compensator alignment

  Build Summary

  Specification	Detail
  Stroke	4.375″
  Material	Heated 4140 steel
  Rod/Bearing Kit	Chromoly Competition, ~1035 g ± 20 g
  Build Method	Custom-built, dynamically balanced
  Pro-Plug System	Proprietary weld, prevents crankpin twist
  Gear-Cam Ready	Yes
  Bearing Setup	Timken or OEM-compatible
  Warranty	2 years, unlimited miles
  Price Range	$1,599.95 – $1,710.95
  Lead Time	2–6 weeks post-order

   Next Steps for Installation

  • Complete Build Form: Required at Darkhorse before crank is built.

  • Choose Bearing Type: Decide between Timken main bearings or OEM style with sprocket shaft race.

  • Plan Machining: H-D piston kits may require small-end clearancing for the full-width competition rod.

  • Installation: Use precise compensator alignment and adhere to torque specs; consider professional dyno tuning especially if running gear cams.