izontally and 15 percent torsionally.
9. The triple-clamp offset has
switched back from 25mm to 22mm.
The steering stem has been moved
forward 6mm, which, combined with
the triple-clamp offset changes, results
in a 3mm increase in trail.
10. The engine motor mounts are
lower and more compact, plus the
mounting brackets are aluminum rather than steel. Also, the cylinder is
more vertical; it’s tilted back 6. 2
degrees compared to 8. 2 degrees last
11. The Kayaba Speed Sensitive
System (SSS) fork gets a 1mm-larg-
er damping piston and a mid-speed
damping valve with a leaf spring rather than a coil spring. The shock spring
is thinner, stiffer and 7 ounces lighter.
12. The 2018 seat is flatter and
lower than before, with the rear of the
seat 20mm lower. The grips are now
5mm higher and 6mm farther forward.
13. There is all-new plastic on the
2018 YZ450F. The gas tank is 1.4
quarts smaller. The frame is 1 inch
narrower at the seat/tank junction and
the radiator shrouds. The radiators are
more vertically mounted and closer to
the center of the frame. The radiators
have a 4.5-percent-larger core.
14. The air filter cover is held on
by only one Dzus fastener. Air-filter
intake volume is up 29 percent.
15. The 2018 Yamaha YZ450F’s mapping can be tuned with the Yamaha
Smartphone Power Tuner app.
16. The manufacturer’s suggested
retail price is $9199.
(Top) The rear of the
seat is 20mm lower
than it was last year.
The overall bike is
much sleeker and
easier to move around
on. Best of all, the 2018
YZ450F is one inch
narrower at the radiator
(Left) The starter motor
is tucked in behind
the cylinder in the
same location as the
KTM, Husqvarna and
Honda starter motors.
It is powered by a lithium-ion battery. This
leaves Kawasaki and
Suzuki as the last of the