At the heart of the 1990 Harley-Davidson FLSTC 1340 Heritage Softail Classic custom - cruiser motorcycle, Harley-Davidson utilizes a 1337 cc (81.6 cu in) air-cooled v2, four-stroke layout. In factory specification, peak output is rated at 49 HP (35.8 kW) at 5,000 rpm while maximum torque reaches 97 Nm (71.5 lb-ft) at 2,350 rpm, transferring power to the rear wheel through a 5-speed gearbox and belt final drive. With a specific output of 36.6 HP per liter and a 2,650 rpm working window between peak torque (2,350 rpm) and peak power (5,000 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the FLSTC 1340 Heritage Softail Classic measures 298 kg (657 lbs) wet (curb), translating to a power-to-weight ratio of 0.16 HP/kg (6.08 kg per horsepower). Rider ergonomics and chassis geometry center around a 673 mm (26.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,638 mm (64.5 in) wheelbase engineered for planted straight-line stability. The 13-liter (3.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Harley-Davidson archive, this model family spans 5 indexed model years from 1988 to 1992, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
36.6 HP/L
Power-to-Weight
0.16 HP/kg (6.08 kg/HP)
Power Band Window
2,350–5,000 rpm
Standover Height
673 mm (26.5 in)
Engine
Displacement1337.0 ccm (81.58 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsV2, four-stroke
Power49.0 HP (35.8 kW)) @ 5000 RPM
Torque97.0 Nm (9.9 kgf-m or 71.5 ft.lbs) @ 2350 RPM
Compression8.5:1
Bore x Stroke88.8 x 108.0 mm (3.5 x 4.3 inches)
Valves/Cylinder2
Fuel SystemCarburettor. Keihin, 38mm
Fuel ControlOverhead Valves (OHV)
IgnitionAnalogue CDI
LubricationDry sump
CoolingAir
Transmission
Gearbox5-speed
Final DriveBelt (final drive)
ClutchWet, multiple discs, cable operated
Chassis
Front SuspensionTelescopic forks
Rear SuspensionDual shocks
Wheelbase1638 mm (64.5 inches)
Wheels & Brakes
Front Tyre140/90-16
Rear Tyre140/90-16
Front BrakesSingle disc
Front Brake Ø292 mm (11.5 inches)
Rear BrakesSingle disc
Rear Brake Ø292 mm (11.5 inches)
Dimensions & Weight
Dry Weight317.0 kg (698.9 pounds)
Weight incl.298.0 kg (657.0 pounds)
Power/Weight0.1546 HP/kg
Seat Height673 mm (26.5 inches) If adjustable, lowest setting.
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
