Suzuki DF250SS - Manual (Page 6)

5
Alumite coating
Piston
Resin coating
T
O
R
Q
U
E
(5
0
N
•
m
)
LOW MID
ENGINE SPEED (rpm)
HIGH
without Multi-Stage Induction
with Multi-Stage Induction
Torque Curve
Multi-Stage Induction Module
Air Flow in Multi-Stage Induction Module
Lower rpm High rpm
Close Open
Forged Pistons
The upper portion of each piston used in the DF250SS is treated
with an alumite coating that increases heat resistance. A resin
coating applied to the piston skirt improves resistance to wear and
reduces friction.
Fuel Cooler
The cooler the fuel the denser it is, and the denser it is, the
more performance it delivers. The DF250SS incorporates a water -
cooled fuel rail in the fuel delivery system. The fuel is cooled before
it is injected into the cylinder resulting in better combustion and
better performance.
O
Multi-Stage Induction
Suzuki engineers also utilized Suzuki’s Multi-Stage Induction,
which changes intake manifold pipe length according to engine rpm
to enhance engine performance. The DF250SS utilizes two intake
manifold pipes per cylinder; one operates at low engine rpm and
the other takes over at higher rpm. During low engine rpm, air
enters the combustion chamber through the longer, curved mani-
fold pipe. The particular length of this pipe allows just the right
amount of fresh air into the chamber to improve combustion and
boost low-end torque.
As engine rpm increases, a valve on the intake manifold opens,
letting air enter directly
into the combustion
chamber through the
short, straight intake pipe.
This allows a greater
volume of air into the
chamber, increasing the
engine’s ability to breathe
at high rpm, thus
improving high-end
power output.
T