← BSA

Naked bike · 1964

A 50 Royal Star

User Rating: /5 · No user ratings yet ✓ Your rating was saved

MotoLibrary Score

41 /100 Commuter

Power

33 HP

Engine

500 ccm

1970 1969 1968 1967 1966 1965 1964 1963

Technical Overview

1964 BSA A 50 Royal Star Technical Analysis & Specification Breakdown

Built around BSA's naked motorcycle platform, the 1964 BSA A 50 Royal Star pairs a 500 cc (30.5 cu in) air-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 33 HP (24.1 kW) at 5,800 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 66 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

Rider ergonomics and chassis geometry center around a 1,391 mm (54.8 in) wheelbase engineered for quick, flickable steering geometry. The 18-liter (4.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's BSA archive, this model family spans 8 indexed model years from 1963 to 1970, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.

Specific Output

66 HP/L

Engine

Displacement 500.0 ccm (30.51 cubic inches)

Engine Type Twin, four-stroke

Engine Details Twin, four-stroke

Power 33.0 HP (24.1 kW)) @ 5800 RPM

Compression 7.5:1

Bore x Stroke 65.5 x 74.0 mm (2.6 x 2.9 inches)

Fuel System Carburettor

Fuel Control Overhead Valves (OHV)

Cooling Air

Transmission

Final Drive Chain (final drive)

Clutch Wet multiplate

Chassis

Frame Type Single cradle

Front Suspension Hydralic telescopic forks

Rear Suspension Twin shock

Wheelbase 1391 mm (54.8 inches)

Wheels & Brakes

Front Tyre 3.25-18

Rear Tyre 3.25-18

Front Brakes Expanding brake (drum brake)

Rear Brakes Expanding brake (drum brake)

Dimensions & Weight

Fuel Capacity 18.00 litres (4.76 US gallons)

Before You Compare This Bike

Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.

Power

Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.

Fuel Capacity

Fuel capacity helps estimate touring range and how often you may need to stop.

Brakes

Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.

Suspension

Suspension details can matter for comfort, road feel and long-distance riding.

Rider Profile

Who Is This Bike For?

🟢

Beginner

A2 license compatible, manageable power.

🏍️

Best For

City & Weekend Rides

Find similar bikes for your profile →

Estimate

Ownership Cost Calculator

Annual km

Fuel Price ($/L)

Fuel Consumption (L/100km) — estimated

⛽ Fuel

per year

🔧 Maintenance

per year

🛡️ Insurance

per year

TOTAL

* Estimates only. Actual costs vary by country, riding habits, insurance provider and maintenance schedule.