2000 Suzuki RMs
,
Both the 2000 Suzuki
RM125 shown here (and the RM250)
feature many refinements to both the engines
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piston-ring locating pin has been moved to the
rear of the piston and Is now on the intake side
of the cylinder. In this position, the pin gets
additional support from a new bridge that
divides the third scavenging port. The first and
second scavenging ports have been reshaped
for smoother flow, and the exhaust-port width
has been narrowed 1mm . The port has also been
reshaped, with an improved chamfer to prevent
the piston ring from catching the bridge. To
improve low-end to midrange power. the
exhaust-valve shape has been altered and the
control system has been changed from a direct
type to an L-arm type for more precise control,
particularly at low rpm . Other engine changes
include increased crankshaft inertia, with an
increase in primary compression; carbon-tiber
reed valves; a new race-team-replica exhaust
pipe (designed to improve mid· to high-range
. performance); the same Keihin PWK38PWJ
carburetor but with a bypass starter circuit (as
does the 250) tei improve low-rpm throttle
response and power; and new ignition timing.
The COl box has also been moved from the
steering head to the airbox. Suzuki also tinkered
with the transmission's gearshift cam plate so
that neutral-gear position is easier to find.
