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The appearance from the front, rear and profile of the motorcycle must in
principle conform to the homologated shape after the addition of additional
radiators or oil coolers.
2.4.8.16 Air box
The following air box rule only applies to motorcycles homologated before
the 31 st of December 2009:
• The air box may be altered or replaced from those fitted to the
homologated motorcycle (a special design for racing is allowed). If
fuel injectors are attached to the cover of the air box, their position with
reference to the throttle body must remain as original.
• The air filter element may be removed.
• The air box must be completely closed around the induction bell mouth and
all engine breather tubes. The fuel injection system may be entirely within
the air box.
• The air box drains must be sealed.
• All motorcycles must have a closed breather system. All the oil breather
lines must be connected and discharge in the air box.
• The breather system (air box plus any breather oil collector box) must be
capable in the event of drain pipe blockage, of retaining a minimum of 1000
cc of discharged fluid.
For motorcycles homologated after the 1 st of January 2010:
• The air box must remain as originally produced by the manufacturer on the
homologated motorcycle.
• If the homologated air box is used to mount top type fuel injectors or
variable intake tract devices, then the air box and the attached systems
must remain as homologated and function in the same way.
• Air filters, internal flap type valve, sensors and vacuum fittings may be
removed, modified, or replaced with aftermarket parts.
• Any holes in the air box to the outside atmosphere resulting from the
removal of components must be completely sealed from incoming air.
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