Webb’s engine is full of factory secrets. We did learn that
GYTR plays a big part in development and performance.
The radiators have been drawn in for a narrower cockpit.
Additionally, the Raptor footpegs are 5mm higher.
they shave down the frame where the radiators mount
to draw the radiators in 5mm on each side. It narrows
the cockpit, particularly by Webb’s knees when he is in a
WHAT ARE WEBB’S BIKE SETUP
PREFERENCES? At 5-foot- 7, Cooper Webb is slightly
below the average height for a racer, though his
stature in no way hinders his performance. He proved
as much every time he blitzed the whoops and blew
away the competition in the 250 West. The beauty of
modern machinery is that a bike like the YZ250F can be
custom tailored to Cooper. His mechanic, Eric Gass, cuts
10mm off the subframe to lower the rear end. The Raptor
titanium footpegs are 5mm taller, while the Pro Taper
Carmichael-bend handlebars are low, sweeping and rolled
back. In Supercross, Cooper preferred the same handlebar
bend, only Gass cut 5mm off each end. The positioning
of the Pro Taper medium-compound half-waffle grips is
also unique. The clutch-side waffle is set in the standard
position, while the throttle-side grip is rolled forward. The
reasoning? When Cooper re-grips the throttle, the waffle
is in the right spot. He also runs his ARC levers low.
WHAT ARE THE SERVICE INTERVALS ON
WEBB’S BIKE? Replacing parts before reaching service
interval limits safeguards against potential disaster. That’s
why every few hours Eric Gass routinely round-files parts
that would last years for most riders. Want examples?
Every 10 hours the titanium shock linkage bolts, engine
cases, as well as the linkage and swingarm bearings are
replaced. Gass tears down Webb’s engine after every
National (the team would go through the engine every
two rounds in Supercross), and replaces anything that is
out of spec. Having said that, it’s possible for the frame
and swingarm to last an entire year. These parts are only
replaced if they get tweaked during a massive crash.
WHO BUILDS WEBB’S YZ250F ENGINE? The Star
Racing powerplant is a blend of aftermarket and factory
components. It’s understandable that Gass was tight-
lipped about the intimate details of Webb’s engine, given
that the powerplant is the bread and butter of any race
bike; however, it was easy to notice the GYTR
cylinder head. As Yamaha’s official aftermarket entity,
GYTR has extensive knowledge of all things YZ250F.
GYTR also took care of the valve train and porting,
as well as a sturdy ignition cover that holds more oil.
They also provided a clutch basket. Note that the internal
clutch hub, pressure plate, clutch plates and fibers are
stock, while Webb prefers to run YZ450F clutch springs.
A GET ignition allows the team to tune the engine and
customize the power from track to track. Cooper general-
ly doesn’t deviate from his chosen map setting, but there
are options available. CWI trues and balances the cranks,
and Xceldyne titanium valves are installed. Star Racing
feeds VP Racing MR-Pro 6 fuel into the fire-breathing
engine. To combat a rampant problem with late-model
YZ250Fs, the team made a spark plug cap holder that
ensures the cap doesn’t dislodge from the spark plug.
We can’t overlook the transmission, which uses the
stock gear ratios (even though the transmission is far
from stock). The gears undergo a special treatment
process, not only for durability but also to promote
lubrication. Webb sticks with a 13/47 final drive train.
FMF works closely with the team to develop exhaust sys-
tems that meet the demands of their riders. The Factory
4.1 wraparound exhaust, complete with MegaBomb head-
er, is specifically designed for Cooper Webb. That’s just
one of the perks of being on the Star Racing team.
WHICH OF WEBB’S PERFORMANCE MODS
COULD YOU MAKE TO YOUR YZ250F? Yamaha
YZ250F owners should rejoice, because while Webb’s