All design solutions on the uncompromising MXV 450 have been dictated by the need to achieve the highest possible level of performance while extending the bike’s range of use.
The under-seat exhaust, for example, features a brand new path for better motocross performance with more torque at lower revs.
Valve gear based on a single overhead cam and four titanium valves per cylinder gives the best possible compromise between compactness, light weight and performance.
Thanks to its advanced technology the 45.2 engine is extremely civilised and silent running even in this motocross version, and complies easily with FIM rules for noise emissions (94 dB threshold).
The MXV 450 affords beautifully easy access for maintenance (plugs, oil filter, air filter), and boasts extended maintenance intervals, far above the average.
The engine has a dry sump lubrication system with the oil tank integrated inside the crankcase. Elimination of the external oil tank and its connecting pipes has led to a further reduction in weight.
The starter motor has been eliminated for the same reason. Starting is by kick-start only in order to minimise weight.
The salient specifications of the 45.2 engine on the new MXV:
Electronic fuel injection.
Dry sump lubrication with the oil tank integrated inside the crankcase. Separate lubrication for gearbox and engine to keep oil efficient for longer.
Single overhead cam, titanium valves.
Single-piece crankshaft.
Cylinders integrated in crankcase, wet liners.
Choice of “Big Bang” and “Screamer” ignition settings.
“Hard/soft” mappings selectable from the handlebars.
Electronic stepper motor idling control.
Maximum engine speed 12,500 rpm.
CHASSIS: LIGHTER THAN EVER
The dimensions of the perimeter frame have been optimised for motocross use, and the entire frame has been developed to complement the engine. Its design is unique among motocross frames. A tubular steel trellis is interference fitted to pressed aluminium side plates to form a single structure. The engine also forms an integral part of the chassis, acting as a load-bearing element and contributing to exceptional overall rigidity.
Particular care has been taken over weight distribution. Weight has been centralised as far as possible to improve agility under all conditions.
Weight reduction (one of the most important aspects of any motocross bike) was central to the design of every part of the MXV, from disc brake to frame.
The swingarm has been designed for maximum lightness and elasticity and incorporates hydroformed members. The rising rate linkage system is damped by a fully adjustable Sachs racing monoshock with two damping settings for high and low speed riding.
The Marzocchi upside down fork has 50 mm stanchions and is also calibrated for motocross. The fork is fully adjustable, so that you can set up your own suspension action exactly as you want it.
The fuel tank has been redesigned to keep the bike’s centre of gravity as near as possible to the physical centre of the machine. Attention has also been given to eliminating protruding parts to reduce width and improve ergonomics.
The centralisation of weight has also influenced the design of the filter box. The filter is now located at the front of the bike, leaving the fuel tank more space to extend back over the rear shock absorber.
The filter box also holds the throttle bodies and facilitates filter changing.
The ECU and all the components of the electrical system are also housed securely inside the filter box.
The exhaust system, under-seat silencer and twin tail pipes are made entirely from titanium (pipes and silencer).
The minimal electrical system is batteryless, and fully integrated inside the filter box. Engine and electrical system therefore form a single block.
The two-tone stepped seat helps the rider hold his position at all times.
BRAKES
The unrivalled technology and performance of the chassis are supported by a fantastic braking system. The MXV is equipped with Nissin floating calipers and super-lightweight wavy discs (270 mm at the front), for unrivalled braking control in even the most challenging conditions.
A 240 mm rear disc with single piston Nissin caliper provides the perfect balance between stopping power and ease of control.
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