Technical SpecificationsEngine: 77° V twin four stroke. Liquid cooled. Single overhead cam with rocker operated exhaust valves, chain timing drive, 4 valve heads, titanium valves.
Fuel: Lead-free petrol.
Bore x Stroke: 76 x 49.5 mm
Total displacement: 449 cm3
Compression ratio: 13 :1
Fuel system: Integrated engine management system controlling ignition and fuel injection. Throttle body: 38 mm. Hard and soft mappings selectable from the handlebars.
Ignition: Electronic digital (batteryless).
Starting: Kick-start.
Exhaust: Conforming to FIM standards for 2009.
Generator: 220 W
Lubrification: Dry sump. Separate gearbox lubrication.
Gear box: 4 speed. Motocross gear ratios: 1st 14/29 2nd 15/26 3rd 17/25 4th 19/24
Clutch: Multi-plate in oil bath, cable operated.
Primary drive: Spur gears. Transmission ratio: 23/65.
Final drive: Chain. Transmission ratio: 14/49.
Frame: Cr-Mo steel perimeter frame with aluminium alloy vertical members. Headstock rake angle 26.2°. Lightweight rear frame section.
Front suspension: 50 mm Marzocchi upside down fork with adjustments for compression and rebound.
Rear suspension: Pro-Link with Sachs monoshock, adjustable in compression and rebound.
Brakes: Front: 270 mm lightweight stainless steel floating disc with Nissin floating caliper. Rear: 240 mm lightweight stainless steel disc with Nissin floating caliper.
Wheels: Black anodized aluminum alloy. Front: 1.60 x 21”. Rear: 2.15 x 19".
Tires: Front: Dunlop 80/100-21 51M. Rear: Dunlop 110/90-19 62M.
Source:
http://www.apriliausa.com