Ariel KH 500 Fieldmaster
1957Allround

Ariel KH 500 Fieldmaster

Key specifications

Engine
498 cc
Power
28 HP
Weight
177 kg
Fuel type
petrol
Fuel capacity
4.5 L
Transmission
4-speed
Seat height
31 mm
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1957 Ariel KH 500 Fieldmaster: a classic motorcycle that effortlessly marries vintage charm with the rugged practicality of an all-rounder. Emerging from the prestigious British manufacturer Ariel, which had become a subsidiary of BSA in 1944, the KH 500 Fieldmaster was designed for those who craved the freedom of the open road while still being able to tackle rough terrain. This motorcycle captures the spirit of adventure, appealing to riders who appreciate both style and substance. With its iconic red finish and classic lines, the Fieldmaster stands out as a quintessential representative of mid-century motorcycling. At the heart of the KH 500 is its robust 498cc twin-cylinder, four-stroke engine, producing a spirited 28.03 horsepower at 6500 RPM. This powerplant not only delivers a top speed of 145 km/h (90.1 mph) but does so with a delightful character that resonates with riders. The compression ratio of 6.8:1, combined with a carburettor fuel system, ensures smooth throttle response and reliability. Whether cruising down the highway or navigating through winding rural roads, the 4-speed gearbox and dry plate clutch provide a satisfying shift experience, while the impressive fuel economy of 3.04 litres per 100 km (77.38 mpg) means you can enjoy longer rides without frequent stops at the pump. The KH 500 Fieldmaster is equipped with features that showcase the technological advancements of its time. Its duplex loop frame ensures a solid structure, contributing to both stability and agility. The front telescopic forks provide a comfortable ride over uneven surfaces, while the rear rigid suspension offers the classic feel that enthusiasts cherish. Both ends are equipped with expanding drum brakes that deliver reliable stopping power, echoing the motorcycle’s vintage ethos. With a seat height of 787 mm and a manageable weight of 177 kg (390.2 pounds), it’s designed to accommodate riders of various sizes, making it an accessible choice for many. In summary, the 1957 Ariel KH 500 Fieldmaster is a motorcycle that embodies the essence of classic British engineering, offering a unique blend of style, performance, and nostalgia. Whether you're a collector, a vintage enthusiast, or a rider seeking a unique machine, the Fieldmaster promises an engaging riding experience that stands the test of time.

Pros

  • Timeless Design: With its classic styling and vibrant red color, the KH 500 Fieldmaster is a head-turner that appeals to both vintage enthusiasts and casual riders alike.
  • Strong Performance: The combination of a powerful engine and excellent fuel economy makes this motorcycle a practical choice for both daily commuting and longer excursions.
  • Rider-Friendly Dimensions: The manageable weight and moderate seat height ensure comfort and confidence for a wide range of riders.

Cons

  • Limited Suspension: The rigid rear suspension may not provide the comfort needed for long-distance touring on rougher roads.
  • Drum Brakes: While reliable for the era, the expanding drum brakes may lack the stopping power and responsiveness of modern disc brakes.
  • Kick Start Only: The absence of an electric starter means that some riders may find it less convenient to start, particularly in less-than-ideal conditions.

Technical details

Source specification data

Make
Ariel
Model
KH 500 Fieldmaster
Category
Allround
Starter
Kick
Comments
Ariel was bought by BSA in 1944.
Color Options
Red
Power
28.03 HP (20.5 kW)) @ 6500 RPM
Clutch
dry plate
Gearbox
4-speed
Ignition
Lucas
Top Speed
145.0 km/h (90.1 mph)
Fuel System
Carburettor
Bore X Stroke
56.0 x 86.0 mm (2.2 x 3.4 inches)
Compression
6.8:1
Displacement
498.00 ccm (30.39 cubic inches)
Cooling System
Air
Engine Details
Twin, four-stroke
Exhaust System
2-into-2 pipes
Fuel Consumption
3.04 litres/100 km (32.9 km/l or 77.38 mpg)
Greenhouse Gases
O2
g/km. (
O2
-
Carbon
dioxide emission)
Lubrication System
Dry sump
Transmission Type Final Drive
Chain
Dry Weight
177.0 kg (390.2 pounds)
Seat Height
787 mm (31.0 inches) If adjustable, lowest setting.
Fuel Capacity
17.00 litres (4.49 gallons)
Overall Width
686 mm (27.0 inches)
Overall Length
2,184 mm (86.0 inches)
Ground Clearance
140 mm (5.5 inches)
Power Weight Ratio
0.1584 HP/kg
Seat
Solo seat with springs
Wheels
Wire spoked. Dunlop tyres.
Rear Tyre
3.50-19
Frame Type
Duplex loop
Front Tyre
3.00-20
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Rigid
Front Suspension
Telescopic forks

Available colors

Red