This is the smallest 2-stroke engine of the Enduro range currently produced at Beta's factory in Italy. The result of a long process of design and development, carried out entirely by the Technical and R&D Departments with the focus being a proper engine layout designed to optimize the distribution of weight while paying close attention to the power delivery. The result of the engine's components including the crankshaft and gearbox, has created a compact engine that provides the optimum performance and reliability. The power delivery is smooth, yet powerful which is a feature not found in many models this size.
There are many distinctive features of this engine, including:
-Double piston rings (54 mm): piston designed to ensure high rigidity and reliability; the choice of double rings provides a better seal at the low and medium rpm ranges typical of off road riding.
-Beta progressive valve: the power valve system derived from the 250 and 300cc RR models, characterized by a particular relationship between the opening of the main flap and that of the side boosters. The delay in opening the boosters enables excellent progressiveness in performance throughout the rpm range of the engine.
-Crankshaft with polyamide inserts: favoring lightness and ensuring optimum filling of the crankcase to the benefit of performance and reliability.
-Cylinder: exhaust flange system that is a separate machined part like that on the larger 2018 RR models, enabling better control of the piston-flap-cylinder front tolerance. By keeping this value to a minimum it is possible to achieve a significant performance boost at low rpm, reducing the leakage of gases.