| 449cc liquid-cooled, DOHC,
four-valve, four-stroke single |
- A lightweight forged piston reduces
reciprocating weight
- Triple piston rings and a 21mm
diameter piston pin help increase
durability and reduce necessary
maintenance
- Lightweight titanium valves and
aluminum valve spring retainers
reduce reciprocating weight and
boost high-rpm reliability
- Asymmetrical high-acceleration
cams yield high intake efficiency
- Lightweight high-performance
titanium exhaust header contributes
to low and mid-range throttle response
- Electric starting facilitates
quicker stall recovery and lowers
rider fatigue
- Large-volume airbox contributes
to both intake efficiency and sharp
engine response. An air duct fashioned
from polyethylene resists deformation
caused by intake pulses and helps
ensure stable engine performance
- Advanced engine tuning provides
a broad torque curve and an optimized
power delivery for quick acceleration
without excessive wheelspin
|
| Digital Fuel Injection |
- 32-bit digital fuel injection
system with a 42mm throttle body
- System measures coolant temperature,
air intake temperature, air intake
pressure, engine speed and throttle
position, then automatically delivers
the ideal amount of fuel to optimize
power delivery
- Crisp engine response is especially
advantageous for instant acceleration
after landing from jumps
- Promotes trouble-free starting
–a great benefit in races
with engine off starts
- Fuel injection allows the use
of a lighter throttle return spring,
which reduce rider fatigue
|
| Transmission |
- The five-speed (one-down, four-up) manual
transmission locates the reverse gear
below first. Actuating the reverse-lock
release lever when in first gear allows
you to shift “down” into reverse
- Compact reverse-lock release lever can
be activated with the right thumb, allowing
the reverse gear to be engaged while still
keeping the front brake lever depressed
- The combined weight of the reverse gear
system and the lightweight aluminium chassis
is no heavier than using a steel frame
without reverse
|
| Aluminum Chassis |
- Highly rigid aluminum frame contributes
to the KFX’s excellent handling
and traction. The frame’s high torsional
rigidity enhances stability in corners
and allows the suspension to be easily
set up to suit course conditions
- Designed for high corner speeds, the
KFX ATV sits low to the ground, helping
to reduce roll tendencies
- Mounting the battery and coolant tank
in front of the engine lowers the center
of gravity, and helps weight the front
wheels for increased traction when cornering
- Single box-tube lower frame contains
the front A-arm attachment points. This
design is narrower than the competition’s
frames and enables the use of longer lower
A-arms
|
| Advanced Suspension Design
|
- Dual-rate front springs deliver
progressive suspension travel for
excellent rough-terrain handling
- Extra-long lower front A-arms
minimize camber variations through
the suspension stroke, maximize
front wheel traction and boost stability
- Rear shock features both low-
and high-speed compression adjustability
and adjustable rebound damping
- The curved lines and rounded
edges of the cast aluminum rear
swingarm help disperse stress, which
along with its varied wall thicknesses
equal a design that is both light
and strong
- The swingarm’s high torsional
rigidity contributes to excellent
rear wheel traction
- The rear axle is tapered for less
unsprung weight
|
| Front and Rear Disc Brakes |
- Dual front hydraulic disc brakes offer
consistently strong stopping performance
- Petal-type rear brake rotor reduces
unsprung weight and helps clean the brake
pads for more efficient braking performance
in difficult conditions
- Integrated rear parking brake is designed
to be easily engaged and released
while wearing gloves. When engaged,
the parking brake lever also prevents
the clutch lever from being actuated
|
| Additional Features |
- Two-tone seat features a smooth top
surface for excellent rider mobility and
slip-resistant sides for good grip when
hanging off in corners
- Seat, tank and side covers are shaped
to allow excellent rider mobility and
to provide support when hanging off in
corners.
- Tapered Renthal Fatbar offers both strength
and light weight
- Handlebar mount designed to accommodate
other MX-type handlebars, enabling riders
to select from numerous after-market styles
- Specially designed rear wheels feature
reinforcing plates for the rims. Located
on the axle side of the rims, these plates
reinforce the rims where strength is most
needed while minimizing weight
- Wide front bumper, can be gripped with
two hands to push/pull the ATV
- Two-piece “lapped” front
and rear fenders can be replaced separately
in the event they are damaged
- Detachable front headlight assembly
can easily be removed to reduce weight
when racing
- Optional kick-start system is
available for MX-style (AMA Pro
ATV) races where light weight is
a priority
|
