2012 Yamaha Grand Majesty 400 Technical Analysis & Specification Breakdown
Built around Yamaha's scooter motorcycle platform, the 2012 Yamaha Grand Majesty 400 utilizes a 395 cc (24.1 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 30.8 HP (22.5 kW) at 7,500 rpm while maximum torque reaches 33 Nm (24.3 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 78 HP per liter and a 1,500 rpm working window between peak torque (6,000 rpm) and peak power (7,500 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 Grand Majesty 400 measures 221 kg (487 lbs) wet (curb), translating to a power-to-weight ratio of 0.14 HP/kg (7.18 kg per horsepower). Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,565 mm (61.6 in) wheelbase engineered for planted straight-line stability. The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 3 indexed model years from 2011 to 2015, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
78 HP/L
Power-to-Weight
0.14 HP/kg (7.18 kg/HP)
Power Band Window
6,000–7,500 rpm
Standover Height
750 mm (29.5 in)
Engine
Displacement395.0 ccm (24.10 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power30.8 HP (22.5 kW)) @ 7500 RPM
Torque33.0 Nm (3.4 kgf-m or 24.3 ft.lbs) @ 6000 RPM
Compression10.6:1
Bore x Stroke83.0 x 73.0 mm (3.3 x 2.9 inches)
Fuel SystemInjection. EFI
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionTCI
LubricationWet sump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry, centrifugal automatic
Chassis
Frame TypeAluminum die-cast and steel tube backbone
Rake27.0°
Trail100 mm (3.9 inches)
Front SuspensionTelescopic forks
Rear SuspensionUnit swing
Wheelbase1565 mm (61.6 inches)
Ground Clearance120 mm (4.7 inches)
Wheels & Brakes
Front Tyre120/80-14
Rear Tyre150/70-13
Front BrakesDouble disc. Anti-lock braking
Rear BrakesSingle disc
Dimensions & Weight
Weight incl.221.0 kg (487.2 pounds)
Seat Height750 mm (29.5 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.
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.
