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MotoLibrary Score
34/100Commuter
Power/Weight
0.09 hp/kg
Torque
6 Nm
Engine
89 ccm
Technical Overview
2004 Yamaha TT-R90 E Technical Analysis & Specification Breakdown
Positioned in Yamaha's minibike, cross motorcycle lineup, the 2004 Yamaha TT-R90 E features a 89 cc (5.4 cu in) liquid-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 5.5 HP (4 kW) at 5,600 rpm while maximum torque reaches 6.1 Nm (4.5 lb-ft) at 6,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 61.8 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the TT-R90 E measures 60 kg (132 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (10.91 kg per horsepower). Rider ergonomics and chassis geometry center around a 625 mm (24.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,040 mm (40.9 in) wheelbase engineered for quick, flickable steering geometry.
Specific Output
61.8 HP/L
Power-to-Weight
0.09 HP/kg (10.91 kg/HP)
Standover Height
625 mm (24.6 in)
Engine
Displacement89.0 ccm (5.43 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power5.5 HP (4.0 kW)) @ 5600 RPM
Torque6.1 Nm (0.6 kgf-m or 4.5 ft.lbs) @ 6500 RPM
Compression8.5:1
Bore x Stroke47.0 x 51.8 mm (1.9 x 2.0 inches)
Fuel ControlSingle Overhead Cams (SOHC)
CoolingLiquid
Transmission
Final DriveChain (final drive)
Chassis
Front SuspensionTelescopic fork
Front Travel110 mm (4.3 inches)
Rear SuspensionSwinging arm (monocross)
Rear Travel95 mm (3.7 inches)
Wheelbase1040 mm (40.9 inches)
Ground Clearance172 mm (6.8 inches)
Wheels & Brakes
Front BrakesExpanding brake (drum brake)
Front Brake Ø95 mm (3.7 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø110 mm (4.3 inches)
Dimensions & Weight
Dry Weight60.0 kg (132.3 pounds)
Power/Weight0.0915 HP/kg
Seat Height625 mm (24.6 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.
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.
