WHAT IS IT? There is always a rebel who refuses to
be trendy. Earl Shuler Racing (ESR) is run by an old
desert rat who knows more about bikes than 10 hotshot
newcomers. Earl does things differently. Thus, ESR KTM
4CS fork mods are crafted for men exactly like Earl: rebels
who don’t want the same fork valving as James Stewart—
because they aren’t James Stewart.
WHAT’S IT COST? $200.00 (4CS revalve), $100.00 (base
valves), $50.00 (fork oil).
CONTACT? (760) 949-0942.
WHAT STANDS OUT? Here’s a list of things that stand
out with the ESR KTM 4CS fork mods.
(1) Chambers. ESR modifies the 4CS design to allow
the fork oil to flow more freely from chamber to chamber
(4CS is an acronym for 4 Chamber System). ESR believes
that the stock 4CS fork’s restricted fluid dynamics are
good for Supercross but not for average riders who are
looking for more comfort. Giving the oil room to expand
makes the forks plusher in the mid-stroke.
( 2) Valving. ESR makes the low- and high-speed
compression damping more progressive and lightens
up the mid-speed compression. The rebound is freed up
so the forks can recharge quicker.
( 3) Base valve. The majority of aftermarket suspension
tuners install new base valves into the bottom of 4CS
forks. This puts the compression adjuster in the bottom
of both fork legs and makes both fork cap adjusters
into rebound clickers. The new base valves come with a
longer and more tapered adjustment needle, which offers
a much wider range of adjustment. Additionally, ESR
polishes the fork legs for less stiction. If they have to
change the seals, wipers, springs or bushings, there are
extra charges, but ESR says that most KTM 4CS forks
have good internals that don’t need to be replaced as
often as their competitors’.
( 4) Performance. In a paradox, every MXA test rider
came back and raved about how plush the ESR forks
were, but none of the faster test riders wanted to race
with them because they felt that they bottomed too
easily. The Vet and Novice test riders loved the ESR
forks. They were very absorbent and stayed connected
to the ground. ESR eliminated the jackhammer feel that
is the trademark of WP forks. MXA had ESR re-valve
our forks several times to firm them up at the end of
the stroke. Once we got them where we wanted them
to be, they worked great. These are not Supercross-stiff
forks; thus, they aren’t for tracks that consist of nothing
but jumps. They are plush forks that don’t beat you to
death in the braking bumps. We think that they are the
perfect Over- 40 racer’s forks. Is there a market for this
kind of setup? You bet. Most Vet riders who send their
forks out to be re-valved get forks back that are too stiff
for them. Not with ESR. If you want forks that work in
the rough, absorb consecutive braking bumps and allow
you to go faster later in the motos, call ESR. Ask for
WHAT’S THE SQUAWK? None.
These are four-star forks for riders
ESR SUSPENSION KTM 4CS FORK MOD
who know that they aren’t fast.
MXA TEAM TESTED