Engineered by Yamaha for the naked motorcycle segment, the 1986 Yamaha YX 600 Radian pairs a 599 cc (36.6 cu in) air-cooled in-line four, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 52.4 HP (38.3 kW) at 9,000 rpm while maximum torque reaches 35.6 Nm (26.3 lb-ft) at 7,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 87.5 HP per liter and a 1,500 rpm working window between peak torque (7,500 rpm) and peak power (9,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the YX 600 Radian measures 197.8 kg (436 lbs) wet (curb), translating to a power-to-weight ratio of 0.26 HP/kg (3.77 kg per horsepower). Rider ergonomics and chassis geometry center around a 765 mm (30.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,385 mm (54.5 in) wheelbase engineered for quick, flickable steering geometry. The 12-liter (3.2 US gal) fuel tank paired with a rated consumption of 5.1 L/100 km provides an estimated theoretical range of roughly 235 km (146 miles) between fill-ups, while factory top speed is listed at 125 km/h (78 mph).
Specific Output
87.5 HP/L
Power-to-Weight
0.26 HP/kg (3.77 kg/HP)
Power Band Window
7,500–9,000 rpm
Theoretical Range
~235 km (146 mi)
Engine
Displacement599.0 ccm (36.55 cubic inches)
Engine TypeIn-line four, four-stroke
Engine DetailsIn-line four, four-stroke
Power52.4 HP (38.3 kW)) @ 9000 RPM
Torque35.6 Nm (3.6 kgf-m or 26.3 ft.lbs) @ 7500 RPM
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.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
