The fork in stock trim is dialable via air
increases, though Pro Circuit’s Bones
Bacon snared our Showas and valved
them with his magic potion. The shock
was the one facet that did need some
respringing, so Bones updated the valving spec to a modified version of what
he knew would work for our needs.
While the machine in no way lacks
power, we fit on a Pro Circuit T- 4 Ti
system with fairly low expectations. To
our surprise, the exhaust quelled some
of the miserable loudness of the stocker
and got the power to flow sooner,
smoother and longer. All in all, a big
win. The rest of our effort went into little
irritants that get to you after you spend
time on the bike. The stock Renthal
bars started squeaking and yearned for
a big-bar replacement. The entire driveline on the machine is weak—from the
chainguide and swingarm pads to the
rear sprocket and chain—so we gave
these areas some much-needed attention. Finally, the rubber and the brake
pads got a smattering of love from the
Dirt Bike staff. Here’s a look inside the
mods and our take on the performance.
Pro Circuit’s titanium Ti- 6 system uses their RC- 4 resonance chamber in the header
to help deflect noise sonics and boost bottom performance. The system is super
light and helps pave the way to power gains.
The Ti- 6 is full titanium with a carbon fiber end cap. The machine’s bracket hanger
is aluminum, and it passes AMA/FIM sound levels. The good news is that it broadens the powerband on the KX-F and knocks off some unwanted noise!
Pro Circuit’s suspension mods and rear link make up the suspension changes. We opted for Pro Taper bars and perches,
Dunlop 31s fore and aft, plus Dunlopad rear pucks to replace the stock pads.