WILVO YAMAHA YZ250F
Wilvo Yamaha entrusts Rekluse and GYTR with getting power to the
ground. It’s a match made in heaven.
Test riders fell in love with Tonkov’s carbon fiber subframe. Unfortunately,
carbon subframes are illegal in AMA competition (except for Husqvarna).
The team cut slits in the front number plate and radiator shrouds to
promote airflow into the induction system.
WE RIDE BRENT VAN DONINCK’S
KEMEA YAMAHA YZ250F
Brent Van doninck has competed on the
world stage since 2015. Injuries and inconsistency have hindered his climb up the ladder,
but there’s no denying that Van doninck has
the necessary ingredients for future success.
Led by six-time Belgian National Champion
Marnicq Bervoets, the Kemea Yamaha team
believes in the 21-year-old.
The Kemea team spec’ed a GYTR Racing
engine-development setup similar to what
Cooper Webb relied on to win the AMA
National title. Additionally, Kemea used a
secondary GET injector, which was mounted
on the air-filter cage (a la Kawasaki). A GET
engine-control unit took care of the ignition,
timing and fuel control. To promote cooling
efficiency, the team found a larger radiator
with different flow to be most effective.
Other upgrades included Kayaba’s A-Kit
PSF- 2 air fork and shocks, a carbon fuel tank
and Neken SFS triple clamps. Before the
Valkenswaard GP, Van doninck switched to a
different Akrapovic factory exhaust for more
bottom-end power to help him get off the
gate. Nine rounds later, the team updated the
crankshaft, connecting rod and piston for better acceleration and top-end power.
MXA test riders were enamored by Brent
Van doninck’s YZ250F as they rode it around
the Maggiora, Italy, circuit. The bike had a
neutral setup, without oddities that caused
testers to make drastic changes in their riding styles. Van doninck’s engine demanded
respect, yet the broad power range allowed us
to carry a gear higher through most corners.
At high rpm, the engine never wavered. It was
a do-it-all powerband that would be well liked
by most skill-level racers.
Van doninck’s Kemea Yamaha YZ250F
offered performance consistent with the top-tier bikes found on the AMA National circuit,
aided by the usability of Brent’s Kayaba fork
and shock package. The suspension held up
well at high G-forces and maintained a fair
amount of plushness in low-speed situations. It
never did anything strange. Consistency is key
to going fast, and Brent Van doninck found
great balance with the Kemea YZ250F. ;