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| | | 2007 APRILIA RXV |  Written: 31/10/2006 : 12:02. Read 9150 times (5/day). | 2006 was a great year for Aprilia in off-road racing, with the rider’s and manufacturer’s titles in the S2 class of the Supermotard World Championship as well as excellent results in the Enduro World Championship. Evolution continues on one of the most revolutionnary off-road motorcycle of recent years.
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The RXV gets some new graphics for a more exclusive, racing look, but the most important is in the engine.
The V2 engine is the natural centrepiece of the RXV and its sister bike, the SXV. Aprilia was the first manufacturer in the world to believe in the potential of V twin engines in a market segment where nobody has ever had the courage to try. Impressive results in top level racing in 2005 and 2006 have shown that Aprilia was right. Totally reliable on the racetrack, the V2 engine (entirely made by Aprilia) has not been deprived of any of its technology or performance by homologation for road use.
The 77° V angle between the cylinders is the result of innumerable tests aimed at maximising performance and minimising vibrations. The new engine vibrates far less than any single without even requiring a balancer shaft. It is also a compact engine, smaller than many singles of similar displacement.
On the 2007 RXV the fuel injection system features 38 mm throttle bodies (40 mm on the 550) and is controlled by a programmable ECU. For 2007, the ECU has been given a new, race-developed mapping that improves throttle control and makes power delivery more progressive. The control cams for the throttle butterflies have been given a new profile for the same reason. As a result, the 2007 bike is easier to handle under all conditions, especially on difficult terrain and mud.
About weight reduction, the engine sets a new record for a V twin, even with its starter motor fitted! This has been achieved by an abundant use of super-lightweight prestige materials. The central crankcase sections, for example, are made from aluminium silicon alloy. All covers are in magnesium; the valves are in titanium; and the entire gear train has been made lighter than ever before.
The engine is specially tuned to suit the use of motorcycle. The gear ratios are also precisely calculated for supermotard use in the case of the SXV or enduro use on the RXV. Even the injection and ignition mapping have been modified to give the two engines the right character and performance for the bike; higher revving on the supermotard, smoother and torquier at low to medium revs on the enduro.
Improvements for 2007
- New piston profile
- New piston rings
- New ECU mapping
- New starter motor gearing ratio
- Extended service intervals
Chassis: lighter than ever
The perimeter frame was developed in conjunction with the engine and features a tubular steel trellis structure, interference fitted to pressed aluminium side plates to form an extremely rigid assembly. The engine also forms an integral part of the chassis, acting as a load-bearing element and contributing to exceptional overall rigidity. For 2007, this frame has lost a further 500 grams in weight to become one of the lightest enduro frames around.
The variable section aluminium swingarm is not just an element of style, it is the most rigid swingarm on any motorcycle of this type. Rising rate linkages operate a Sachs multi-adjustable monoshock with piggy-back cylinder and double high/low speed settings. The 2007 RXV has a new suspension setup to improve stability and control over rough ground. A new linkage has also been fitted to make suspension action more progressive and give increased traction and control.
The 45 mm upside down fork is specially calibrated for enduro use. The fork is also fully adjustable, so that you can set up your own suspension action exactly as you want it. The 2007 bike has improved fork calibration designed with the help of Aprilia’s official enduro racing team to improve high speed stability and damping action over stony ground.
The RXV features Nissin calipers with lightweight 270mm wavy discs at the front and a 240 mm rear disc and single piston.
Racing KIT
A new racing kit comes with the bike and allows you to transform it into a virtually race-ready machine. The kit includes a lightweight front light with simplified wiring to eliminate the ignition switch and instruments, number holders, a LED tail light and rear mini-number holder, lightweight throttle control with no starter and with a more gradual cam. Installation of this racing component kit takes another 2 kg off the overall weight of the bike.
Accessories: more race oriented
Aprilia’s engineers, working closely with Akrapovic technicians, have boosted exhaust performance. 
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: 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
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