2.8 TECHNICAL SPECIFICATIONS - SUPERMONO
2.8.1 Displacement capacities
Open to single cylinder motorcycles up to 800 cc.
Engines may operate on the four stroke principle only.
Engines must be naturally aspirated.
2.8.2 Minimum Weights
Supermono: Minimum weight 95 kg.
Ballast may be added to achieve the minimum weights, but it must be securely fixed
to the frame. In the final inspection at the end of the race, the machines chosen will be weighed
in the condition they finished the race. Nothing can be added to the machine
including water, oil, fuel or tyres.
A 1% tolerance in the weight of the machine at the post race control is accepted.
2.8.3 Number Plate
Racing numbers must be affixed to the front and the two sides of the motorcycle so
that they are clearly visible to the spectators and officials.
Number plates must be rectangular in shape with minimum measurements 285 mm x
235 mm (see diagram 0).
One plate must be fixed to the front inclined not more than 30o rearwards from the
vertical. The others must be placed, one on each side of the motorcycle. They must
be fixed in such a manner as to be clearly visible and they must not be masked by any
part of the motorcycle or by the rider when seated in the driving position. Holes can
be perforated between the numbers on a front number plate. However, under no
circumstances must the actual numbers be perforated.
In place of separate plates, a space of equivalent size in matt colours can be painted
or fixed on the bodywork or streamlining.
There must be a clear area around the numbers of at least 50 mm.
The background colours and figures for Supermono are black background with yellow
numbers. With the RAL colour table values being black 9005 and yellow being 1003
(See Art. 01.55).
In case of a dispute concerning the legibility of numbers, the decision of the Technical
Steward will be final.
2.8.5 Fuel
All Supermono engines must function on normal unleaded fuel with a maximum lead
content of 0.005 g/l (unleaded) and a maximum MON of 90 (see also Art. 01.63 for
full specification).
2.8.6 Machine Specifications
2.8.6.1 Main Frame Body
The use of titanium and/or magnesium in the construction of the frame is not
permitted.
2.8.6.2 Front Forks
The use of titanium in the construction of the front forks is not permitted. The surface
treatment is free.
There must be at least 15 degrees of movement of the steering each side of the
centre line.
Stops must be fitted to ensure a clearance of at least 30 mm between the handlebar
and the tank when at the extremes of lock.
The steering damper cannot act as a steering lock limiting device (See Art. 01.33).
2.8.6.3 Rear Fork (Swing arm)
The use of titanium, magnesium and composites in the construction of the rear fork
(swing arm) spindle is not permitted.
2.8.6.4 Suspension
No restrictions.
2.8.6.5 Wheels
Maximum front wheel rim width is 4.0 in.
Maximum rear wheel rim width is 6.25 in.
Minimum wheel diameter is 16 in.
The use of titanium or any other light alloy in the construction of the wheel spindles is
not permitted.
2.8.6.6 Brakes
Supermonos must have a minimum of one brake on each wheel that is independently
operated. The use of carbon fibre or carbon composite discs is not allowed.
2.8.6.7 Tyres
Racing tyres must be used.
2.8.6.8 Foot Rest/Foot Controls
Footrests may be of a folding type but in this case must be fitted with a device which
automatically returns them to the normal position, and an integral protection must be
provided at the end of the footrest.
Non folding metallic footrests must have an end (plug) which is permanently fixed,
made of plastic, Teflon or equivalent type of material (min. radius of 8mm).
2.8.6.9 Handlebars and Hand Controls
Handlebars must have a width of not less than 450 mm and their ends must be solid
or rubber covered. The width of the handlebar is defined as the width measured
between the outside of the handlebar grips or throttle twistgrips.
The use of titanium in the construction of handlebars is not permitted.
Throttle controls must be self closing when not held by the hand.
Levers must not be longer than 200 mm measured from the pivot point.
Engine stop switch must be located on the handlebars.
2.8.6.10 Fairing/Body Work
The front wheel with the exception of the tyre and the part hidden behind the
mudguard must be clearly visible from each side.
No part of the streamlining must be in front of a vertical line drawn 100 mm in front of
the front wheel axle. Mudguards shall not be considered as streamlining.
Mudguards are not compulsory. When fitted, front mudguards must not extend in
front of a line drawn upwards and forwards at 45 degrees from a horizontal line through
the front wheel spindle or below a line drawn horizontally and to the rear of the front
wheel spindle.
The windscreen edge and the edges of all other exposed parts of the streamlining
must be rounded.
The front inclination where the number plate is fixed must not exceed an angle of 30o
to the rear of the vertical (see diagram A).
Whatever the position of the handlebars, there must be a space of at least 20 mm
between the streamlining and the ends of the handlebars or other steering system,
including any attachments thereto.
The maximum width of bodywork must not exceed 600 mm. The width of the seat or
anything to its rear shall not be more than 450 mm, exhaust systems excepted.
The maximum height of the back of the riders seat is 150 mm. This will be measured
from the lowest point of the rigid base of seat to the uppermost part of the fairing
behind the rider.
No part of the streamlining (fairing) must be to the rear of a vertical line drawn
through the rear wheel axle.
The rim of the rear wheel must be clearly visible over 180o of its circumference to the
rear of this line.
There must be a clearance of at least 15 mm around the circumference of the tyre at
all positions of the motorcycle suspension and all positions of the rear wheel
adjustment.
No part of the motorcycle shall project to the rear of a vertical line drawn through the
exterior edge of the rear tyre.
The motorcycle, unloaded, must be capable of being leaned at an angle of 50
degrees from the vertical without touching the ground, other than the tyres.
Air foils or spoilers may only be fitted on solo machines when they are an integral
part of the fairing or seat. They must not exceed the width of the fairing nor the height of
the handlebar. Sharp edges must be rounded off with a minimum radius of 8 mm.
Moving aerodynamic devices are not permitted.
The rider in the normal driving position must be completely visible, with the exception
of his forearms, from either side, from the rear and from above. The minimum space
between the face of the rider, or his helmet and the streamlining (including the
windscreen) must be 100 mm. It is forbidden to use transparent materials to evade
these rules.
The fuel cap must be fitted in such a way that it does not protrude in relation to the
tank profile and cannot be torn off in a crash.
The lower fairing has to be constructed to hold, in case of an engine breakdown, at
least half of the total oil and engine coolant capacity used in the engine (min. 5 litres).
The lower fairing should incorporate a maximum of two holes of 25 mm. These holes
must remain closed in dry conditions and can only be open in wet race conditions as
declared by the Clerk of the Course.
All exposed edges must be rounded.
2.8.6.11 Fuel Tank
Fuel tank must be completely filled with a fire retardant material (i.e. "Explosafe").
Fuel tanks with tank breather pipes must be fitted with non-return valves that
discharge into a catch tank with a minimum volume of 250 cc made of a suitable material.
Fuel caps, when closed, must be leak proof. Additionally, they must be secured to
prevent accidental opening at any time.
The fuel cap must be fitted in such a way that it does not protrude in relation to the
tank profile and cannot be torn off in a crash.
2.8.6.12 Seat
The seat/rear cowl must allow for proper number display.
The width of the seat shall not be more than 450 mm.
The maximum height of the back of the riders seat is 150 mm. This will be measured
from the lowest point of the rigid base of seat to the uppermost part of the fairing
behind the rider.
All exposed edges must be rounded.
2.8.6.15 Radiator and Oil Coolers
Oil cooler must not be mounted on or above the rear mudguard.
2.8.6.16 Air Box
The air box is compulsory and must be completely closed around the induction bell
mouth and all engine breather tubes, with air ingress only above the lowest point of
the bell mouths lip (see diagram C). Carburation instruments may be entirely within the
airbox.
The air box drains must be sealed.
All Supermono motorcycles must have a closed breather system. The oil breather
line must be connected and discharge in the airbox.
The breather system (airbox 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.
2.8.6.17 Carburation instruments
No restrictions
2.8.6.18 Engine
Maximum capacity is 800 cc.
Engines may operate on the four stroke principle only.
Engines must be normally aspirated.
Cubic capacity of the engine will be defined by the swept volume of the cylinder, i.e.
the area of the bore of the cylinder multiplied by the stroke.
No tolerance on capacities is permitted.
Engine capacity must be measured at ambient temperature.
2.8.6.19 Fuel Supply
All fuel lines must be totally leak proof.
2.8.6.20 Oil Lines
Oil lines containing positive pressure must be of metal reinforced construction with
swaged or treaded connectors.
2.8.6.31 Transmission/Gearbox
The maximum number of gears is limited to six speeds.
2.8.6.35 Exhaust System
Maximum noise limit is 105 dB/A measured at a mean piston speed of 11 m/sec for
4-stroke engines.
The correct stroke must be marked on a clearly visible position of the crankcase.
The outlet of the exhaust must not extend behind a line drawn vertically through the
edge of the rear tyre.
The last 30 mm of the pipe must be horizontal and parallel to the centre line of the
motorcycle with a tolerance of +/- 10 degrees.
2.8.10 The following items MUST BE incorporated
Motorcycles must be equipped with a functional ignition kill switch or button mounted
on either side of the handlebar ( within reach of the hand while on the hand grips)
that is capable of stopping a running engine.
Throttle controls must be self closing when not held by the hand.
Electric fuel pumps must be wired through a circuit cut out which will operate
automatically in the event of an accident.
A test procedure for the circuit cut out must be incorporated in the design of
electrically operated fuel pumps for use upon inspection.
Safety bars, centre and side stands, if fitted, must be removed.
All drain plugs must be wired. External oil filter(s) screws and bolts that enter an oil
cavity must be safety wired.
All Supermono motorcycles must have a closed breather system. The oil breather
line must be connected and discharge in the airbox.
2.14.6.1 For Supermono class, the test RPM will continue to depend upon the
mean piston speed corresponding to the stroke of the engine, according to the
following table.
Stroke 2-stroke 4-stroke Stroke 2-stroke 4-stroke
in mm in mm
30 13,000 11,000 66 5,909 5,000
31 12,580 10,645 67 5,820 4,925
32 12,187 10,313 68 5,735 4,853
33 11,818 10,000 69 5,652 4,783
34 11,470 9,706 70 5,571 4,714
35 11,142 9,429 71 5,492 4,648
36 10,833 9,167 72 5,416 4,583
37 10,540 8,919 73 5,342 4,521
38 10,263 8,684 74 5,270 4,459
39 10,000 8,462 75 5,200 4,400
40 9,750 8,250 76 5,132 4,342
41 9,512 8,049 77 5,065 4,286
42 9,285 7,857 78 5,000 4,231
43 9,069 7,674 79 4,937 4,177
44 8,863 7,500 80 4,875 4,125
45 8,666 7,333 81 4,815 4,074
46 8,478 7,174 82 4,756 4,024
47 8,297 7,021 83 4,699 3,976
48 8,125 6,875 84 4,643 3,929
49 7,959 6,735 85 4,588 3,882
50 7,800 6,600 86 4,535 3,837
51 7,647 6,471 87 4,483 3,793
52 7,500 6,346 88 4,432 3,750
53 7,358 6,226 89 4,382 3,708
54 7,222 6,111 90 4,333 3,667
55 7,090 6,000 91 4,286 3,626
56 6,964 5,893 92 4,239 3,587
57 6,842 5,789 93 4,194 3,548
58 6,724 5,690 94 4,149 3,510
59 6,610 5,593 95 4,105 3,474
60 6,500 5,500 96 4,063 3,438
61 6,393 5,410 97 4,021 3,402
62 6,290 5,323 98 3,980 3,367
63 6,190 5,238 99 3,939 3,333
64 6,093 5,156 100 3,900 3,300
65 6,000 5,077
For Supermono class only, when presented for examination, the correct stroke must
be stamped in a clearly visible position on the crankcase.
