With the adjustable offset Xtrig clamp, Martin prefers to run
20mm offset outdoors (stock is 22mm). Another useful feature
of the Xtrig clamp is the plethora of bar-mount positions with
the option of fixed- or rubber-mounted bars. Alex runs
rubber-mounted bar clamps. Notice how the fuel line has
been re-routed underneath the air filter cover. Very cool.
The JGR subframe adjuster is very unique. You turn the
threads in the subframe pivot to lower the subframe height.
It’s possible to lower the subframe by up to 10mm, which is
exactly what the short-statured Alex Martin prefers. The JGR
adjustable subframe is available to the public.
Suspension Direct (SDI) takes care of the rear shock
assembly. The longer pull rod and aftermarket bell crank
change the rising rate and geometry. At 5-foot- 4, Alex likes
the rear of the YZ250F to stay down to prevent the rear
end from kicking him in the rough. Martin runs taller JGR
footpegs to decrease the size of the cockpit. Alex prefers
low-profile Vortex handlebars with very little sweep.
JGR takes care of the suspension setup. Thanks to a
suspension simulator, JGR can make advancements in the
shop as well as on the track. Martin’s shock setup is rather
stiff, with very good resistance to bottoming. The rear end
tracked well across acceleration bumps and settled decently
Racing is the blue crew’s A-level squad, followed by Star
Racing, Valli Motorsports and Rock River. Thanks to their
commitment to Yamaha, Rock River is given free bikes
and discounted parts. Alex Martin’s bike is peppered with
GYTR accessories and other performance items, thanks
to a collaborative effort between Yamaha and several
aftermarket companies. It’s great that the Rock River
program is getting rewarded for its efforts.
TEST RIDE: THE MAIDEN VOYAGE
Getting to test Alex Martin’s CycleTrader.com Rock
River Yamaha YZ250F had been in the works for months.
MXA initially proposed the idea during the Supercross
series with the caveat that we were most interested in
testing Martin’s outdoor setup. The logistics proved
challenging, with the team located in Georgia and MXA
in SoCal, but we both cleared a window between the
Glen Helen and Hangtown Nationals.
We feel compelled to address the stipulations placed on
the test. There were three rules we couldn’t break during
our time on Martin’s YZ250F. (1) Rock River didn’t want
any big MXA test riders to ride the bike. Alex Martin tips
the scales at 135 pounds soaking wet. Denney wanted
to make sure that the MXA testers weren’t heavier than
Martin, because she feared that it would jeopardize
suspension performance and skew our opinion. We
benched the mesomorphs and sent our lightweight
riders to the test. ( 2) MXA didn’t want Alex’s practice
bike or some gussied-up stock YZ250F in team graphics.
We wanted the real deal. ( 3) Given that JGR rebuilds
Martin’s engine after every three Nationals, there was
an imaginary clock ticking down until the powerplant
needed servicing. Granting MXA a test of the bike would
shorten the engine’s life span by one full race—if we
spent all day pounding out laps. We agreed to an engine
time limit that was sufficient for our purposes. ❏