On The Pegs July 2018 - Volume 3 - Issue 7 | Page 48

On The Pegs
2019 Beta 300 RR
livery due to the special timing of the
opening of the main flap and that of
the side boosters. The delayed opening
of the boosters enables excellent per-
formance and linear power throughout
the engine’s rpm range.
• Crankshaft with polyamide inserts:
favors lightness and ensures optimum
filling of the crankcase, boosting per-
formance and reliability.
• Cylinder: has an exhaust flange sys-
tem as on the bigger engines, enabling
better control of frontal piston-flap-
cylinder play. By keeping this value to
a minimum it is possible to achieve a
significant low-rev performance boost
by reducing exhaust gas leakage.
• Aluminum demountable cylinder
head dome: rigid and lightweight
solution made possible by shifting the
engine mount on to the cylinder. The
geometry of the combustion chamber
is designed to ensure a high-efficiency
thermodynamic cycle and obtain the
best compromise between responsive-
ness at low-to-medium revs and during
spurts. It also facilitates fine tuning and
replacement of the combustion cham-
ber.
• Die-cast crankcase in aluminum
alloy: the casing geometries were
designed according to an innovative
layout in terms of the relative posi-
tion of components and with a view
to maximize weight reduction without
compromising structural strength.
Considerable attention was focused on
the main bearing area to ensure correct
wall rigidity in order to withstand the
stresses transmitted by the crankshaft.