Back to Bike FinderYears: 1979 · 1978 · 1977 · 1976 · 1975 · 1974
Hercules K 125 S
1976Classic

Hercules K 125 S

Key specifications

Engine
124 cc
Power
17 HP
Fuel type
petrol
Fuel capacity
2.9 L
Transmission
6-speed
Front brakes
Single disc
Rear brakes
Expanding brake

Overview

Introducing the 1976 Hercules K 125 S, a quintessential representation of the naked bike genre that emerged during the mid-1970s. Renowned for its minimalist design and spirited performance, the K 125 S carved a niche for itself among riders looking for a lightweight, agile motorcycle that didn’t compromise on style or functionality. With its iconic silhouette and classic retro aesthetics, this bike was positioned to appeal to both novice riders and seasoned enthusiasts who appreciate the blend of simplicity and performance in a motorcycle. At the heart of the K 125 S lies a spirited single-cylinder, two-stroke engine, boasting a displacement of 124cc. This compact powerhouse delivers a commendable 17 horsepower at 7,500 RPM, allowing the bike to reach a top speed of 117 km/h (72.7 mph). The 11.8:1 compression ratio and balanced bore and stroke dimensions of 54mm each contribute to its lively throttle response and engaging ride characteristics. Coupled with a smooth 6-speed gearbox and chain final drive, the K 125 S offers an exhilarating experience, making it an enjoyable companion for both city commutes and winding country roads. Riders will appreciate the lightweight design, tipping the scales at just 122 kg (269 pounds), which enhances maneuverability and confidence while navigating through traffic or on twisty backroads. The 1976 Hercules K 125 S not only impresses with its performance but also with its thoughtful features and technology. Equipped with a single disc brake at the front and an expanding brake at the rear, it provides reliable stopping power, allowing for precise control. The air-cooled engine design keeps maintenance straightforward, while the 11-litre fuel tank ensures ample range for those spirited rides. With its minimalist yet purposeful styling, the K 125 S captures the essence of classic motorcycling, making it a timeless piece for collectors and enthusiasts alike. **

Pros

  • Lightweight & Agile: Weighing only 122 kg, the K 125 S is easy to maneuver, perfect for both new riders and seasoned veterans looking for a quick and nimble ride.
  • Engaging Performance: The single-cylinder, two-stroke engine delivers a lively power band that makes for an exhilarating riding experience.
  • Classic Aesthetics: With its retro styling, the K 125 S stands out in a crowd, appealing to those who appreciate vintage motorcycle design.

Cons

  • Limited Power Output: With only 17 HP, it may struggle to keep up with modern bikes in terms of sheer power and speed.
  • Basic Suspension Setup: The suspension may not offer the same level of comfort or performance as more advanced systems found in contemporary models.
  • Two-Stroke Maintenance: The two-stroke engine requires more frequent maintenance and attention compared to four-stroke rivals, which may deter some riders.

Technical details

Source specification data

Make
Hercules
Model
K 125 S
Category
Naked bike
Power
17.00 HP (12.4 kW)) @ 7500 RPM
Gearbox
6-speed
Top Speed
117.0 km/h (72.7 mph)
Bore X Stroke
54.0 x 54.0 mm (2.1 x 2.1 inches)
Compression
11.8:1
Displacement
124.00 ccm (7.57 cubic inches)
Cooling System
Air
Engine Details
Single cylinder, two-stroke
Transmission Type Final Drive
Chain
Fuel Capacity
11.00 litres (2.91 gallons)
Weight Incl Oil Gas Etc
122.0 kg (269.0 pounds)
Rear Tyre
3.00-17
Front Tyre
2.75-17
Rear Brakes
Expanding brake
Front Brakes
Single disc