The 2014 Yamaha YZ450F is the undisputed horsepower king of the 450 class. This pays huge dividends in motocross and Supercross
applications, but doesn’t always help pay the bills in off-road settings.
We decided to take the stock YZ450F from the Dirt Bike fleet of test
machines and, with a little help from Mike Gilstrap’s crew at Thousand
Oaks Powersports, see if we could hit pay dirt turning the Yamaha into
a tactical off-road-racing weapon.
With the YZ450F already producing big numbers in the horsepower
department, our main goal was to make it easier to transfer that power
to the ground without increasing the length of our arms in the process.
We turned to Wade Wilcox at Injectioneering to modify our stock throttle
body. Making a stock throttle better is a lot more complicated than getting
out the Dremel tool and grinding away. Wade does lots of super-secret
measurements and adjustments if needed, along with completely custom
hand-made butterflies. Our goal was to take away the jumpiness right off
the bottom and soften the hit through the mid-range in hopes that it would
help the cornering manners of the YZ.
Another change in the engine department was the addition of a Rekluse
3.0 complete auto-clutch system. The system includes an inner hub, pressure plate and drive-plate system. The stock clutch basket can be utilized, but in this case we opted for a Rekluse billet-aluminum basket just
because our stocker had quite a few hours on it. Samco silicone radiator
hoses were installed to improve coolant flow in hopes of making the bike
run cooler, and the blue color was definitely an improvement over the
stock black models.
Test rider Pete Murray enjoys his
time aboard our Thousand Oaks
Powersports’ MX “Dream Bikes”