Although Yamaha was tight-lipped about horsepower numbers, we know that Pourcel’s YZ250F engine was a rocket
ship. Best of all, engine builders Bob Oliver and Dan Rambert
managed to squeeze every ounce of power out without sacri-;cing reliability. Christophe and his mechanic, Scotty Adkins,
didn’t suffer one mechanical failure during the Nationals.
The 270mm oversize front rotor came from Yamaha Japan,
but the rest of the front-brake setup is available to the public.
All you need to do is order a front-brake caliper and master
cylinder for a 2007 Yamaha YZ450F. The larger pistons
provide better feel at the lever and improved stopping
power over the current iteration.
The MXA test riders loved the Kayaba kit forks. They gushed
about the plush feel in the beginning of the stroke and the
fork’s ability to remain comfortable the harder they twisted
the throttle. Pourcel runs softer settings than most Pro bikes
we have ever tested, because he has such unique line
choices. Instead of hammering through the bumps,
Christophe prefers to travel on the path less taken in
order to maintain traction and save energy.
Need power? Pourcel had it in spades. In fact, Christophe
had access to as much horsepower as he could ever want in
the Valli Motorsports YZ250F. However, the Frenchman
preferred a useable powerband in order to have the best
traction at the rear tire. This was an engine that demanded
respect, but wasn’t overwhelming. We loved it.