Suzuki DF 50 Service Manual

3-19 ENGINE CONTROL SYSTEM
AIR INTAKE COMPONENTS
Air, after entering through the silencer, passes through the throttle body and flows into the surge tank where
it is then distributed to the cylinder intake manifold.
Intake manifold pressure, monitored by the MAP sensor, is an indirect measure of the intake air amount.
When the throttle is fully closed, the main supply of intake manifold air necessary to sustain engine idle
passes through the by-pass air passage.
To maintain engine idle speed at specification, the ECM controlled IAC valve supplies a regulated amount of
additional air through the IAC (idle air control) passage.
THROTTLE BODY
The throttle body assembly consists of the main bore, throttle
valve, air bypass / IAC passages, air by-pass adjustment screw
and CTP switch.
The throttle body adjusts the intake air amount with the throttle
valve which is connected to the throttle / linkage lever.
The CTP (closed throttle position) switch installed on the top
of throttle body informs of throttle valve position.
NOTE:
Do not try to adjust or remove any of the throttle body compo-
nent parts (CTP switch, throttle valve, throttle / linkage lever,
etc.).
These components have been factory adjusted to precise speci-
fications.
AIR FLOW
(Plunger)
IAC valve
Through passage
in flywheel cover
Silencer
IAC valve silencer
Frame arrester
By-pass air
passage
By-pass air
screw
Throttle body
Intake manifold
IAC passage
MAP sensor
Gas filter
(Surge tank)

Suzuki DF 50 Specifications

General

Engine Type	4-Stroke
Cylinders	3
Displacement	941 cc
Starting System	Electric
Steering	Remote
Engine Type Detail	DOHC 12-Valve
Maximum Output	50 HP
Ignition System	Digital CDI
Alternator	12V 19A
Gear Ratio	2.27:1
Exhaust	Through Prop Hub Exhaust
Trim Method	Power Trim and Tilt
Max Power	50 HP
Alternator Output	12V 19A
Fuel Delivery System	Sequential Multi Point Electronic Fuel Injection
Full Throttle Operating Range	5, 300 - 6, 300 rpm
Engine Oil Capacity	2.7 L
Full Throttle RPM Range	5300 - 6300 RPM
Oil Capacity	2.7 L
Bore x Stroke	72.5 x 76.0 mm (2.85 x 2.99 in.)