2015 Yamaha SR400, DIMENSIONS Length 82.1 in. Height 43.1 in. Width 29.5 in. Weight 384 lbs. wet Wheelbase 55.5 in. Seat Height 30.9 in. ENGINE Engine SOHC, 2-valves Displacement 399 cc Bore x Stroke 87 x 62.7 mm Compression Ratio 8.5:1 Carburetion Fuel injection Fuel Tank Capacity 3.2 gal. MPG Rating 66.2 mpg Ignition TCI: Transistor Controlled Ignition Clutch Multi-plate wet Cooling Air DRIVETRAIN Transmission 5-speed Final Drive Chain BRAKES/WHEELS/TIRES Brakes Front: 268 mm hydraulic discRear: 150 mm drum Tires Front: 900/100-18M/C 54SRear: 110/90-18M/C 61S