Bigmitch

Just see this on IOMTT forum.

Dear TT Teams and Competitors



Please find the first draft of the technical regulations being proposed for the inaugural Lightweight TT Race for Supertwin machines due to be introduced at TT 2012. Please review the information below and come back to me with any comments no later than Friday 30th of September. Any comments or proposals received after this date will not be considered for 2012.



I must stress that this document is a draft, put together by our partners ACU Events Ltd, race organisers of the TT Races, in line with the Department of Economic Development’s direction on containing costs, encouraging a significant entry and producing close and exciting racing in keeping with the rest of the TT Programme.



Yours sincerely



Paul Phillips





Lightweight TT Race – Technical Regulations Draft 1



Machines must comply with general technical rules as per ACU Standing Regulations.



Any four-stroke twin cylinder motorcycle originally sold for road use with a water cooled engine of up to 650cc may be used provided it adheres to the following regulations.

Eligible machines must be from models homolagated 2005 or later.



1. Frame and Swing Arm:



Frame must remain as originally produced by the manufacturer for the homologated machine. Nothing may be added or removed from the frame body. Rear sub frame may be replaced or modified.



Swing arm may be replaced from a model of the same Manufacturer, provided the original attachment to frame and rear suspension remains as homologated.



2. Suspension:



Forks may be replaced from a model of the same Manufacturer. Original internal parts of the fork may be modified or replaced. Aftermarket damper kits or valves may be installed.



Fork springs may be replaced. Fork caps may be modified or replaced beyond the homologated standard to allow external adjustments.



Steering damper may be added or changed.



Rear suspension unit can be changed or modified, the original attachment to the frame and swing arm must remain as homologated.



3.Brakes:



Front and rear brake discs may be changed. Only ferrous materials are allowed for brake discs.



Front and rear brake calipers may be changed. Front and rear brake pads may be changed.



Front and rear master cylinders may be changed.



Front and rear hydraulic brake lines may be changed. The split of the front brake lines for both front brake calipers must be made above the lower fork bridge (bottom yoke).



4. Wheels and Tyres:



Wheels must remain as homologated except for bearings, spacers and spindles.



All tyres must be treaded. Slick tyres are not permitted.



5. Controls:



Footrest and foot controls may be replaced or relocated but brackets must be mounted to the frame at the original mounting points.



Handlebars, hand controls and cables may be altered or replaced. Engine starter switch and kill switch must be located on the handlebars and must be operational at post race technical checks.



6. Bodywork, tank, fairing and seat unit:



Fairing, mudguards and seat unit may be altered or replaced.



Windscreen, if fitted, may be replaced with transparent material only.



The original instruments and fairing brackets may be removed or replaced.



The petrol tank must remain as originally produced by the manufacturer for the homologated machine. The position of the tank mounting points on the frame must remain as standard.



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 (minimum 5 litres). The lower edge of openings in the fairing must be positioned at least 50 mm above the bottom of the fairing.



7. Battery:



The size and type of the battery may be changed and relocated.



8. Engine:



Cylinder head, rods, pistons, valves, cylinders may be modified but the capacity must not exceed 650cc. Stroke must remain as standard. Crankshaft must remain as homologated



Camshaft timing may be changed by the slotting of cam sprockets. Cam lift must remain as homologated.



Polishing and lightening of engine parts is permitted. Balancing or gas flow modifications normally associated with individual tuning is permitted. Compression ratio of the engine maybe changed. The thermostat may be removed from the housing to aid cooling, if required.



Engine fuel/ignition ECU must remain as homologated or as homologated with addition of “power commander” type device plugged in to the existing wiring loom, to alter fuelling only.



9. Transmission:



Additions to the gearbox or selector mechanism, such as quick shift systems are permitted.



Clutch springs, friction and drive plates may be replaced.



The use of slipper clutches is permitted.



Front and rear external drive sprockets, chain pitch, width and length can be changed.



10. Electrics:



The alternator, starting system, starter crank gear and starter shaft may not be altered, replaced or removed from those fitted to the homologated motorcycle.



11. Exhaust System;



Exhaust pipe and silencers may be altered or replaced from those fitted to the homologated motorcycle.



The number of final exit(s) to the exhaust may be altered from that of the homologated machine.



12. Fasteners:



Standard fasteners may be replaced with fasteners of any material and design. The strength and design must be equal to or exceed the strength of the standard fastener it is replacing for structural applications.



The use of titanium in the swing arm spindles and the wheels spindles is forbidden. For wheel spindles the use of light alloys is also forbidden. The use of titanium alloy nuts and bolts is allowed. Aluminium fasteners may only be used in non-structural locations.



13. The Following Items MUST BE Removed:



Headlamp, rear lamp and turn signal indicators. Rear view mirrors, horn, license plate bracket, tool box, helmet hooks and luggage carrier hooks, passenger foot rests, passenger grab rails, safety bars, centre and side stands must be removed (fixed brackets must remain).



14.The following items MAY BE removed:

Instruments, instrument bracket and associated cables, horn, license plate brackets, tool kit, tachometer, speedometer and wheel spacers, radiator fan and wiring, passenger foot rests, passenger grab rails and upper chain guard.



15. Chain Guards:



A guard must be fitted in such a way as to prevent trapping between the lower drive chain run and the final drive sprocket at the rear wheel.



16. Fuel:



Only Unleaded fuel as specified in the 2012 IOM TT regulations is permitted. The use of fuel additives is strictly prohibited.



17. Radiator and Oil Cooler:



The original radiator or oil cooler must not be modified. The use of coolants is prohibited, water only to be used.