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1.0 Engine Description Nominal Capacity..................................................248.4cm3 Original Bore...........................................................58.0mm Theoretical Maximum Bore.....................................58.01mm Stroke........................................................................47mm Volume of Combustion Chamber...............................12cm3   (Repair Limit of 0.6cm3) Compression Ratio................................................11.35 : 1 Cooling System..........................................................Water

2.0 Carburetor DELL'ORTO carburetor...................................1 per cylinder. Carburetor Diameter...................................................22mm. The carburetor body, slide, needle, atomizer tube and atomizer insert is to remain as originally supplied and cannot be subject to any modification. No additions or additional machining, filing, drilling or polishing etc is permitted to these items, this includes the bore/throat. "PHBL 22" cast in the housing of the carburetor "BD" or "BS" stamped in the housing of the carburetor Atomizer Tube stamped with "266DA" or "264DA" Needle Stamped with D31 or others as nominated in the future Slide Marked #30 Only Other settings in the carburetor are free.

3.0 Camshaft Camshaft Drive Type...........................................SOHC Belt Intake Lift..................................................................7.5mm Intake Opening Duration....................................268 Degree Intake Timing Opens..................................25 Degree BTDC Closes.......................................................63 Degree ABDC Exhaust Lift...............................................................7.5mm Exhaust Opening Duration.................................268 Degree Exhaust Timing Opens...............................65 Degree BBDC Closes........................................................23 Degree ATDC

4.0 Inlet Valve Must be genuine item Maximum of 1 per cylinder according to the following specification. Weight...........................................................................24g Diameter of Valve Stem................................................5mm Diameter of Valve Head...........................................26.5mm Diameter of Seat......................................................23.5mm Diameter of Duct.........................................................21mm

5.0 Exhaust Valve Must be genuine item Maximum 1 per cylinder according to the following specification. Weight............................................................................21g Diameter of Valve Stem.................................................5mm Diameter of Valve Head...............................................24mm Diameter of Seat..........................................................21mm Diameter of Duct...........................................................23mm

6.0 Crankshaft and Conrods Length between axes of Conrod................................84.5mm Weight of Conrod...........................................................185 g Diameter of Big End......................................................35mm Diameter of Small End...................................................16mm Weight of Crankshaft....................................................1720 g A1.................................................................................93mm A2.................................................................................93mm B1.................................................................................32mm B2.................................................................................32mm C1.................................................................................20mm C2.................................................................................32mm

7.0 Piston Weight of Piston............................................................145 g Complete Number of Rings per Piston..................................3

8.0 Engine Neither the engine nor any of it's ancillaries may be modified in any way. "Modified" is defined as any change in form, content or function that represents a condition of difference from that originally designed. This is to include the addition and/or omission of parts and or material from the engine package assembly unless specifically allowed within these rules. The adjustment of elements specifically designed for that purpose shall not be classified as modifications, IE carburetor and exhaust adjustment screws

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