2008 Manual of Motorcycle Sport - Motorcycling Australia

e) Optional race kit or aftermarket
wheels are permitted,
f) Carbon fibre composite wheels are
allowed unless OEM per model and
year.
15.9.2.10 Tyres:
a) May be slicks or treaded,
b) Must be DOT approved,
c) Must have a speed rating equal to or
above the OEM tyre,
d) Must be commercially available,
15.9.2.11 Bodywork must comply with the
following:
a) Silhouette as per OEM model and
year,
b) Carbon fibre or Kevlar body work is
permissible,
c) Seat unit, ducting and intakes may
be modified,
d) Non-genuine fairing brackets, but
replacements must be mounted in
the original position on the frame,
e) Fuel Tank- standard for the model
and year. No metal may be added or
removed,
f) Petrol tank cap - Standard and
operational for the model and year.
15.9.3 Pro-Twins- Engines
15.9.3.1 The following must be as OEM, per model
and year:
a) Stroke,
b) Valves, but polishing is permitted,
c) Connecting Rods, but shot peening
& balancing is permitted,
d) Crankshaft, but balancing is
permitted. Lightening is not
permitted,
e) Crankcases,
f) Cylinder Heads, but ports can be
modified, machining permitted, but
no added material,
g) Gearbox, but undercutting and
shimming permitted. No race kit,
close-ratio or aftermarket parts
permitted,
h) Carburettor(s), but jetting may be
modified, screw in jets may be fitted,
no material may be removed,
i) Fuel Injectors,
j) Closed breather system must be
retained and operational,
118 enjoy the ride
k) Clutch basket.
15.9.3.2 The following must be as OEM per
model:
a) Radiator(s),
b) Oil Cooler(s).
15.9.3.3 The following must be as OEM:
a) Oil Pickup and Sump pan – capacity
may be modified, but no race kit parts,
15.9.3.4 The following may be modified as
follows:
a) Air box may be modified or changed,
ducting to airbox permitted, Carbon
fibre is permitted
b) Engine covers, aftermarket heavy
duty metal covers permitted
c) Valve Springs – Manufacturer
optional,
d) Cam wheels may be slotted to alter
timing,
e) Piston- aftermarket or other OEM
pistons may be fitted, machining
permitted,
f) Valve Spring retainers- manufacturer
and material optional, titanium
permitted
g) Fuel Injection - remapping of fuel
and ignition curves permitted.
Manufacture of ECU optional,
h) Wiring Harness may be modified,
i) Ignition coils and spark plug leads
and caps may be changed,
15.9.3.5 The following is free:
a) Bore,
b) Camshaft,
c) Rev Limiter,
d) Igniter box,
e) Ignition trigger (mechanical only)
f) Exhaust system (but must not
exceed 95dB(A) measured as per
GCR 12.8)
g) Camshaft
h) Compression ratio,
15.9.3.6 It is recommended that an engine cut-out
operated by a lanyard connected to the
rider by a cord or cable is fitted.
15.9.3.7 If in any doubt as to the eligibility of any
parts, competitors are advised to contact
Formula Extreme Pty. Ltd on 02 49842488
or t_oneill@aus-superbikes.com.au to avoid
costly breaches of these Rules The Pro-
Twins © rules remain the intellectual
2008 MANUAL OF MOTORCYCLE SPORT