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The following engine specifications and components may not be altered from the homologated motorcycle except as noted:
Engine
The homologated engine design model cannot be changed.
Homologated materials and castings for the crankcase, cylinder, cylinder head and gear-box housing must be used.
The method of cam drive must remain as homologated.
The method of valve retention must remain as the homologated model. No pneumatic valve retention devices are allowed unless fitted to the homologated model.
The sequence in which the cylinders are ignited (i.e. 1-2-4-3), must remain as originally designed on the homologated model. Simultaneous (*) firing of 2 cylinders is also forbidden if not adopted on the homologated motorcycle. *up to 5 degrees firing difference in 2 cylinders is regarded as “simultaneous” firing.

Fuel injection system
“Fuel injection system” refers to throttle bodies, fuel injectors, fuel pump and fuel pressure regulator and variable length intake tract devices.
The original homologated throttle body must be used.
Electronically controlled throttle valves, known as ‘ride-by-wire’, may be added or changed.
Modifications are allowed to the throttle body exterior to add or change the “ride-by-wire”. Sensors, bell cranks, pulleys, shaft mounts or clamps may be added changed or removed. However the safety systems and procedures must always be present and fully functional and must include spring closing and/or ignition cut.
The ride-by-wire kit (to modify the standard throttle bodies) must be approved and at least 50 units must be available (if ordered). Only the machine manufacturer or one approved partner can submit a system for approval. The throttle grip position sensor must be included in this kit. The maximum price for the kit is € 2500 (excluding taxes). The maximum lead time is 8 weeks. The approved supplier may optionally charge up to € 500 to fit the system to the throttle bodies.
The use of an optional homologated throttle body is not allowed.
Fuel Injectors must be stock, in the homologated position and unaltered from the original specification and manufacture.
If the homologated air box is used to mount top type fuel injectors then the air box and the attached systems must remain as homologated.
Variable intake tract devices cannot be added if they are not present on the homologated motorcycle.
If the homologated air box is used to mount variable intake tract devices, then the air box and the attached systems must remain as homologated.
Variable intake tract devices must function with the same mechanical system as the homologated system.
The throttle body intake insulators may be modified.
Bell mouths (including their fixing points) may be altered or replaced. Vacuum slides may be fixed in the open position.
Secondary throttle valves and shafts may be removed or fixed in the open position and the electronics may be disconnected or removed.
Air and air/fuel mixture can go to the combustion chamber exclusively through the throttle body butterflies.
“Fuel injection systems” refers to throttle bodies, fuel injectors, variable length intake tract devices, fuel-pump and fuel pressure regulator.
a) The original homologated fuel injection system must be used without any modification.
b) The fuel injectors must be stock and unaltered from the original specification and manufacture.
c) Bell mouths may be altered or replaced.
d) Primary throttle valves cannot be changed or modified.
e) Secondary throttle valves and shafts may be removed or fixed in the open position and the electronics may be disconnected or removed.
f) Variable intake tract devices cannot be added if they are not present on the homologated motorcycle and they must remain identical and operate in the same way as the homologated system. All the parts of the variable intake tract device must remain exactly as homologated (excepting the bellmouths)
g) Air and air/fuel mixture must go to the combustion chamber exclusively through the throttle body valves.
h) Electronically controlled throttle valves, known as “ride-by-wire”, may be only used if the homologated model is equipped with the same system.
Cylinder Head
The homologated cylinder head may be modified as follows:
The cylinder head must begin as a finished production part using
homologated materials and castings. Material may only be added by epoxy or removed by machining. No machining or modification is allowed in the cam box/valve mechanism area.
The induction and exhaust system including the number of valves and or ports (intake and exhaust) must be as homologated.
Porting and polishing of the cylinder head normally associated with individual tuning such as gas flowing of the cylinder head, including the combustion chamber is allowed. Epoxy may be used to shape the ports.
The compression ratio is free.
The combustion chamber may be modified.
Valves must remain as homologated.
Valve seats can be modified or replaced for repair. The material must remain as homologated.
Valve guides must remain as homologated. Modifications in the port area are allowed by machining.
Valve springs may be altered or replaced, their material must remain as homologated. An additional spring may be added or the spring may be removed.
Valve spring retainers, collets, spring seats may be altered or replaced.
Valves must remain in the homologated location and at the same angle as the homologated valves.
Rocker arms (if any) must remain as homologated.
The exhaust air bleed system must be blocked and the external fittings on the cam cover(s) may be replaced by plates.
The shim buckets/tappets may be replaced but must be the same height, diameter, material type, surface finish and shim to top surface dimension as the homologated part. The weight must be equal to or greater than the homologated part.
The homologated cylinder head/cam cover may be replaced by a cosmetic replica of higher specific weight material (i.e. replace magnesium part with aluminium)
Camshaft
Camshafts may be altered or replaced from those fitted to the homologated motorcycle (see also Art. 2.4.8).
Offsetting the camshaft is not allowed. The camshaft must remain in the homologated location.
Cam sprockets or cam gears
Camshaft sprockets, pulleys or gears may be altered or replaced to
allow degreeing of the camshafts (see also Art. 2.4.8).
The cam chain or cam belt tensioning device(s) can be modified or changed.
The cam chain may be altered or replaced but must remain the same type.
Pistons
No modifications are allowed (including polishing and lightening). No “oversize” pistons may be used.
Piston rings
No modifications are allowed.
Piston pins and clips No modifications are allowed.
Connecting rods
Connecting rod may be altered or replaced from those fitted to the homologated motorcycle. The weight must be the same or greater than the original homologated part.
The material must be the same type as the homologated item (i.e. steel, titanium, alloy) or steel.
If the original connecting rod is fitted with a little end insert then the replacement connecting rods may also have an insert of the same material as fitted in the original homologated connecting rod.
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