The bike now comes fitted with Xtrig
Flexfix elastomer handlebar mounts that
squelch vibration, and you can swap out
inserts to get that perfect vibe feel.
There's a new rear-brake master cylin-
der with a larger volume and a new rear
muffler with
a removable spark arrestor.
Traction control and map switch are now
integrated into the handlebar pad, and a
new 200-watt high-output stator powers
an LED headlight and taillight.
Beta's familiar Trail Tech Voyager me
-
ter system has been updated to include
a GPS
system that lets you share your
route with friends and vice versa. Overall,
the Voyager meter has 40-plus functions.
There is also a push-button release seat.
The 390 RS shares the same 88mm
bore as the 350, but the 390 has a longer
63.4mm stroke than the 350's 57.4mm, re
-
sulting in a larger displacement of 385.6cc
versus the
350's 349.1cc. The 390's com-
pression ratio is slightly lower at 12.48:1
compared
to the 350's 13.19:1. The 430, in
comparison, has a shorter stroke than the
390 but has a 7mm larger bore, coming
in at 430.9cc. The 430 also has a slightly
lower compression ratio at 12.33:1.
Like all RS models, the 390 has a fuel
injection system with a 42mm throttle
body and dual injectors.
The 390 has a six-speed transmission
with a wet, diaphragm-spring clutch.
The engine is carried in a molybdenum-
steel double-cradle frame, providing
quick, toolless access to the airbox.
The RS is fitted with the same Sachs
suspension components as the RR X-Pro
models, with external hand-operated
adjusters on the upper fork tubes for pre
-
load, rebound and compression damping.
(The RR Race
models get the higher-end,
pricier KYB suspension.)
According to Beta's specs, the 390 has
the same 36.8-inch seat height as the
other RSs and shares the same 237-pound
dry weight as the 350, which is just two
pounds less than the 430 and 500.
P102
RIDE REVIEW I 2026 BETA 390 RS
