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| | .-| First look : APRILIA RXV 2008 |  Written: 10/09/2007 : 13:34. Read 20428 times (13/day). | Here is Aprilia RXV 4.5 / 5.5 model year 2008, designed on the basis of experience gained in the Enduro World Championship and improved by input from four times world champion Stefan Merriman. The new bike is presented to be even more powerful, agile and reliable (service intervals have almost doubled), to satisfy the demands of professionals and amateurs alike.
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Among the main developments is a new mapping system that lets you switch between two different mappings , with a "full power" setting for use in conditions of good grip, and a "soft" setting for smoother power delivery under more difficult riding conditions. Homologation is now to Euro 3 standard, and dry weight is down by 4 kilograms too.
Aesthetically, the 2008 RXV looks meaner than in the past thanks to new graphics, a two-tone black and red seat, new racing headlight, and a distinctly aggressive nose. Even the tail light is new. In conjunction with general refinements, these important new details have also led to a significant reduction in dry weight, down by 4 kg to only 113 kg.
The new fuel tank blends in better with the overall design of the bike, enabling the rider to shift his weight around more easily. The new handlebars have eliminated the cross-bar and feature more practical and race-oriented controls.
The suspension (featuring a 45 mm upside down fork at the front and a monoshock at the rear) also incorporates new settings suggested by the team official riders, for improved stability on fast sections and better damping over rough ground.
A perimeter frame envelops the powerful, yet reliable four stroke 77° V twin engine liquid cooled. Though now homologated to Euro 3 standard for both engine sizes, 449 cc (RXV 4.5) and 549 cc ( RXV 5.5).
The main improvements to the engine on the 2008 bike concern the electronic management system. This now lets you switch between two different mappings by pressing a button on the handlebars. This feature allows you to select "full power" for use under conditions of good grip or a "soft" setting for more controllable power over challenging surfaces. This riding aid has been appreciated by expert riders (the system was first tried out in the world championship), and enthusiasts in general. Both versions of the engine now boast extended service intervals, among the longest in the category.
The choke is new too, and has been moved from the handlebars to the filter box, which contains a new sponge filter derived from the official racing machines. The 2008 model year RXV also offers a choice of two types of exhaust silencer. The RXV 2008 is fitted as standard with under-seat tail pipes, however, brand new stainless steel side mounted silencers that can be fitted on racing circuits are also delivered along with the bike. These have been specially developed in conjunction with Arrow to deliver smoother power right across the useful engine speed range.
Completing the list of innovations are brand new, compact and light digital instruments, and restyled direction indicators.
Aprilia RXV Technical Specifications (specifications for the 550 engine appear in brackets)
Engine : 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 (80 x 55 mm)
Total displacement : 449 cc (549 cc).
Compression ratio : 12.5:1 (12:1).
Fuel system : Integrated engine management system controlling ignition and fuel injection.
Throttle body: 38 mm. (40 mm)
Ignition : Electronic.
Starting : Electric starting.
Alternator : 340 W.
Lubrication : Dry sump with external oil tank. Separate gearbox lubrication.
Gearbox : 5 speed. Enduro gear ratios:
1st 12/31
2nd 13/25
3rd 15/23
4th 19/24
5th 21/22
Clutch : Multi-plate in oil bath, cable operated.
Primary drive : Spur gears. Transmission ratio: 22/56.
Final drive : Chain. Transmission ratio: 15/48.
Frame :
Steel perimeter frame with alloy vertical members.
Front suspension : Ø 45 mm upside down fork, double adjustment.
Rear suspension : Box section aluminium swingarm with cast body.
Hydraulic monoshock with compression and rebound adjustment.
Brakes
Front: Ø 270 mm stainless steel disc with floating caliper.
Rear: Ø 240 mm stainless steel disc with floating caliper.
Wheels : Light alloy.
Front: 1.60 x 21”
Rear: 2.15 x 18”
Tyres :
Front: 90/90 x 21”
Rear: 140/80 x 18”
Dimensions :
Overall length: 2,222 mm
Overall width: 800 mm
Ground clearance: 396 mm
Seat height: 996 mm
Wheelbase: 1,495 mm
Fuel tank : Capacity 7.8 litres (12 litres on Rally version)
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