The Suzuki 250 uses the same aluminum frame and
bodywork as the RM-Z450, with slight differences in the
cradle around the motor. This is a common theme with
motocross bikes today, but in the case of Suzuki, it’s even
difficult to tell the two motors apart at a glance. The configuration that the RM-Z250 uses is straight forward: double
cams, a five-speed gearbox and Keihin fuel injection. When
you bring the bike home, you get two extra electrical couplers in a little bag. One gives the bike a richer fuel map,
and the other is leaner than standard. This isn’t to adjust
for altitude; the standard injection system already compensates for that, as well as temperature, through on-board
sensors. The couplers allow you to alter the power delivery.
The white (lean) one is more aggressive and the gray one
(rich) is softer.
Last year Suzuki put the Showa Separate Function Fork
(SFF) on both its motocross bikes, but tuned them very
differently. Word on the street was that Japan’s test riders came up with the 450’s settings, while the 250 was
developed here in the United States by guys like Chris
Wheeler. The SFF fork has only one fork spring that resides
in the right leg. Almost all the damping functions are in the
left leg. This is similar, but not identical, to the fork on the
Last year the bike got a surprisingly long list of other
changes to the cooling system, the processor, the gearbox
and even the frame. For 2014, the only real changes are
Kris Palm makes the 2014 RM-Z250 fly around a Perris turn.