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Harley-Davidson V-twin motorcycle engine
Harley-Davidson V-twin motorcycle engine - Image 2
Harley-Davidson V-twin motorcycle engine - Image 3
Harley-Davidson V-twin motorcycle engine - Image 4
Harley-Davidson V-twin motorcycle engine - Image 5

Harley-Davidson V-twin motorcycle engine

$7,700.00 Original price was: $7,700.00.$6,999.00Current price is: $6,999.00.
In Stock

Common Harley-Davidson Engine Capacities (Milwaukee-Eight Era)

  • 107ci (1750cc) — Entry-level stock (e.g., many Touring models; ~80–90 hp / ~100–110 ft-lb torque stock).
  • 114ci (1868cc) — Common high-output stock (e.g., most modern Softails/Tourings; ~90–100 hp / ~110–120 ft-lb torque stock).
  • 117ci (1923cc) — Factory high-performance stock (e.g., CVO models or later upgrades; ~100–110 hp / ~120–125 ft-lb torque).
  • 121ci / 122ci — Aftermarket/Stage kits (e.g., some high-output variants or early big-bore builds; ~110–125 hp).
  • 128ci — Advanced Stage kits (e.g., 4.31″ bore × 4.375″ stroke combos; 120+ hp potential).
  • 131ci (2151cc) — The top-tier shown here (4.31″ bore × 4.5″ stroke; 121–124 hp / 130–135 ft-lb standard, up to 140–150+ hp with custom tuning/exhaust in some builds).

These larger displacements come from bigger bores, longer strokes, high-compr

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Description

is is a high-performance Harley-Davidson V-twin motorcycle engine, specifically a 131 cubic inch (2151cc) displacement crate engine or heavily modified/staged big-bore build.

It’s a Milwaukee-Eight based (M8) engine upgraded to 131ci, most likely the official Screamin’ Eagle® Milwaukee-Eight 131 Performance Crate Engine (or a very close equivalent custom build using similar components). These are popular bolt-in replacement/power upgrades for 2017+ Harley-Davidson models (especially Touring and Softail platforms originally equipped with smaller Milwaukee-Eight engines like 107ci, 114ci, or 117ci).

Key visual and technical details from the image:

  • Overall appearance: A classic 45-degree V-twin layout with two large cylinders (front and rear) angled outward. The finish is predominantly gloss black (powder-coated or painted) on the cylinders, crankcase, and most covers, giving it a sleek, aggressive “blacked-out” custom look.
  • Chrome accents: Polished chrome highlights on the rocker boxes (top covers), pushrod tubes, cylinder base fins (some areas), exhaust valve spring retainers, and other small details — creating strong contrast against the black.
  • Branding & badging:
    • Prominent “STAGE” lettering visible (likely part of “STAGE IV” or similar high-performance designation).
    • “131” prominently displayed on the center timing cover or primary area, indicating the displacement.
  • Other features: Deep black cylinder fins for heat dissipation, exposed pushrods, heavy-duty rocker arms, and a performance-oriented top end (suggesting CNC-ported heads, high-compression forged pistons, larger valves, and upgraded cam). The engine sits on a workbench in a garage/shop setting, surrounded by tools and parts — clearly in a build or display context.

Performance context

This isn’t a stock Harley engine. The 131ci upgrade (often called a “Stage IV” level package) typically delivers massive torque (around 130–135 ft-lb at the rear wheel) and horsepower in the 120–125+ hp range, depending on tuning, exhaust, and intake setup. It’s designed for serious street performance — instant low-end grunt for quick acceleration and strong mid-to-high RPM pull — while remaining street-legal in many configurations.

Harley-Davidson offers this as a factory crate engine in black/chrome or full black finishes, while aftermarket builders (like S&S Cycle big-bore kits) achieve similar looks and specs with stroker cranks, larger cylinders (e.g., 4.25″ bore + longer stroke), and custom finishes.

In short: This is a beast of a big-bore Harley V-twin — blacked-out, chromed in the right places, badged as a 131 Stage performance motor — built for riders who want way more power than a factory 114ci or 117ci setup. Perfect for a custom bagger, Softail, or Touring bike looking to dominate the road! 🏍️💨