Apart from the Cylinder Works 269cc kit, FMF Factory 4.1
exhaust system, Injectioneering throttle body mod and stiffer
clutch springs, we left the YZ250F engine alone. We did run
a Vortex ignition, but didn’t think it added anything that we
couldn’t have gotten with the GYTR Power Tuner. The
big-bore kit retails for $650.
Off the showroom floor the 2014 Yamaha YZ250F is stiff. If
you are fast or close to 170 pounds, you will be thrilled. But,
smaller and slower riders will find it too firm. Enzo revalved
the forks and shock to fit our test rider weight and speed.
The coolest thing we did was to reroute the gas cap vent
hose out the front of the cover.
an accurate picture of who would
like it and who wouldn’t. But,
from that point on, everything we
did was icing on the cake—and
sometimes icing on the icing. Here
is the kudzu list:
Fuel injection. Since we went
big on the engine, we felt that we
might be able to get more power
and better throttle response with
an Injectioneering throttle body
and Vortex programmable ignition.
We have always had good luck
with Injectioneering’s unique but-
terfly design. The Vortex wasn’t
as necessary, since the Yamaha’s
ignition is easily programmable
with the GYTR Power Tuner.
Airbox. We are not fans of
Yamaha’s convoluted double-wall
air intake system for the YZ250F
and YZ450F. Cycra makes a very
unique set of radiator shrouds that
combine single-wall shrouds with
air ducts to not only get more air
into the airbox, but to make the
YZ250F feel lighter and narrower.
While we were in the airbox, we
tossed the stock air filter for a
$269 Twin Air PowerFlow kit.
Yellow plastic. You can buy
stock YZ250Fs with blue or white
plastic, which means that Cycra’s
bright-yellow plastic package is
the cool way to go. Cycra’s kit
includes all the parts you need;
all you have to do is add the
graphics of your choice.
Exhaust system. Even though
the 2014 Yamaha YZ250F has one
of the best production exhaust
pipes we’ve ever tested, it is
possible to get a little more power
from an aftermarket exhaust.
Plus, a Ti system saves a couple
pounds. Our pipe of choice was
a FMF Factory 4.1 RCT Ti
Clutch. More power. More
torque. More air. That means
more pressure on the clutch.