Descrizione Technical Data Displacement: 3,49cc / 0.213 cu.in. Bore: 15,94 mm Stroke: 17,50 mm Weight: 350 gr. Head Diam. : 59,50 mm Operating range: 4.000 – 45.000 rpm Vacuum high pression injected Crankcase Lightened Crankshaft 5 Ports cilinder with antifriction HCP coating Sinterized alloy piston Rear Steel Ball Bearing Double adjustment Carburettor with Interchangeable venturi