The last thing you need to worry about
on a YZ450F is the suspension setup.
UPGRADING MY 2007 YZ450
I just got a bone-stock, like-new
2007 YZ450F, and I plan to do a
few local MX events here in Illinois.
I don’t want to drop big bucks
on mods of any kind, since my
talent and age are the real problem.
Any suspension-setting suggestions?
In 2007, the Yamaha YZ450F had
the best showroom stock forks in
the 450 class. The Yamaha still has
the same basic forks in 2017, and no
one has dethroned them. Your bike’s
forks have 0.47 kg/mm fork springs,
which should be adequate for your
weight and speed. We’d start with
the compression on 11 clicks out,
the rebound on 6 clicks out and the
forks slid up in the triple clamps
5mm. Yamaha shocks from a decade
ago worked best with 100mm of race
sag. Set the low-speed compression
at 10 clicks out, the rebound on 8
clicks out, and turn the high-speed
compression all the way in and then
back out 2-1/8th turns (stock high
speed setting is 1-1/2 turns out).
Apart from general wear and tear
on fork seals and other maintenance
items, you should not have to make
any serious modifications to your
YZ450F forks beyond clickers.