MACHINE SPECIFICATION FOR 115cc (UNDERBONE) (4-stroke horizontal layout engine)

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Filed Under (Tips and Review) by admin on 12-12-2010

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(This is for clarification only. Other parts not listed in Art. 2.5 & 2.6 can be altered or replaced. Change of specification means modification, changes or removal of the parts.) 2.6.1 Change of compression ratio is allowed. 2.6.2 Setting of carburetor, attachment or size change of air funnel. 2.6.3 Inlet opening of fuel tank for fuel charge may be modified but cannot be relocated. 2.6.4 Change of fuel pipe and fuel cork. 2.6.5 Change of exhaust pipe and muffler, but must have silencer. 2.6.6 Material of clutch discs and specifications of spring. Hand clutch is allowed. 2.6.7 Gear ratios are free. 2.6.8 Starting device and parts relative to this device may be removed. 2.6.9 Modification or removal of air cleaner box, wire harness and control wires. 2.6.10 Removal of speedometer (including meter gearbox and cable.) 2.6.11 Removal of drive chain case and cover. Change of drive chain is allowed. 2.6.12 Change of final gear ratio is allowed. 2.6.13 Attachment of bead stopper and balance weight to tyre. 2.6.14 Modification and change of rear brake part is allowed. 2.6.15 Frame body may be strengthened. 2.6.16 Modification and change to brackets and pedals including footrest. 2.6.17 Front suspension unit must remain as originally produced by the manufacturer. However, the following internal parts of the fork can be modified: Shims, hydraulic piston, oil passages, springs and spacers. 2.6.18 Attachment of stabilizer to strengthen or reinforcing rear swing arm is allowed. 2.6.19 Removal of dust seals. 2.6.20 Rear suspension unit must remain as originally produced by the manufacturer. However rear suspension unit is free. The rear linkage must remain as originally produced by the manufacturer. 2.6.21 Handle bars, clutch and front brake lever may be changed by an after market copy. Clutch springs may be changed. 2.6.22 Steering dampers may be fitted. They must not act in any way as a steering lock limiting device. 2.6.23 Materials of streamlining and material of seat cowling. (However, expensive materials such as carbon fibre and kevlar are not allowed). 2.6.24 Removal of rear mudguard and side cover. Front mudguard may be cut but not less than 6 inches from the front fork on original part. 2.6.25 All lubricants are free 2.6.26 Adjusting and polishing any parts are allowed. Adjusting is defined as : “To select each part or assembly complete with-in the limit of single or total tolerance” (i.e. that of valve clearance, ignition timing etc.) 2.6.27 Cutting unnecessary stays is

2008 APRILIA RS125 TECHNICAL SPECIFICATIONS

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Filed Under (Aprilia) by admin on 06-11-2010

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specified in the ACU regulations. The appearance from both front, rear and profile of machines must (except when otherwise stated) conform to the homologated shape. The appearance of the exhaust system is excluded from this rule. 2. DISPLACEMENT CAPACITY The displacement must remain at 124.9cc and the bore and stroke (54 x 54.5) must remain as originally produced. 3. MINIMUM WEIGHT The minimum weight at post race control must not be less than 102kg , this includes oil and water but excludes fuel. At any time during the event, the weight of the whole machine (including the tank) must not be less than the minimum weight, with a tolerance of 1kg. 4. NUMBER PLATE COLOURS The background colours and figures for Aprilia Superteens are: FRONT Red background with white numbers – Nitro Newcomers Class White background with black numbers – J&S Championship Class REAR White background with black numbers – Both Classes Placed in accordance with the ACU regulations. 5. CARBURATION INSTRUMENTS Carburation instruments must remain as homologated. Carburettor jets and needles may be replaced. No modification, polishing or cutting is allowed. Only the 28mm bodied standard carburettor is permitted. Electronic or mechanical enriching devices must remain installed and active (If the carburettor is changed from one model to another, the appropriate wiring loom must also be installed and be operative). Bell mouths must be as originally produced by the manufacturer for the homologated machine. Throttle must be standard, quick action throttles are not permitted.
6. FUEL All machines must function on normal unleaded fuel with a maximum lead content of 0.005 g/l (unleaded) and a maximum MON of 90 (RON 102 max) and be readily available from roadside service stations nationwide. 7. FRAME BODY AND REAR SUBFRAME Frame must remain as originally produced by the manufacturer. The sides of the frame body may be covered by a protective part made of composite material. Nothing can be added by welding or removed by machining from the frame body. Engine mounting brackets or plates must remain as originally produced by the manufacturer. Rear sub-frame may be replaced by the later type sub-frame to accept new style bodywork on pre-2006 models, this unit must use the original mounting points. Bolt on accessories to the rear sub-frame may be removed. Front fairing bracket may be altered or replaced on pre-2006 models to accept later bodywork. 8. FRONT FORKS Forks structure (spindle, stanchions, bridges, stem etc) must remain as originally produced by the manufacturer. Standard original internal parts of the forks may be modified. After market damper kits or valves may be installed. The fork caps can be modified or changed to add spring preload/compression and damping adjusters. Dust seals can be modified, changed or removed providing the fork remains totally oil sealed. Any quantity or quality of oil can be used in the front forks. The height and position of the front fork in relation to the fork crowns is free. A steering damper may be added but may not act as a steering lock device. 9. REAR FORK (Swing Arm) Every part of the rear fork must remain as originally produced (including rear fork pivot bolt and rear axle adjuster). Rear wheel stand positioning (support) brackets may be added by welding or bolts. Brackets must have rounded edges viewed from all sides. Fastening screws must be recessed. 10. REAR SUSPENSION UNIT