Emission Control Caburetor Components (Dr350P/Sp) - Suzuki DR350 Service Manual

DR35DPISP ('93·MDDEl) 12·20
EMISSION CONTROL CARBURETOR COMPONENTS
DR350S motorcycles are equipped
with precision , manufactured carbu retors for emission level con-
trol. These carburetors require special mixture control components and other percision adjustments
to function properly.
There are several carburetor mixture control components in each carburetor assembly . Three (3) of
thses components are machined to much closer tolerances than standard machined carburetor jets.
These three (3) particular jets - MAIN JET. NEEDLE JET. PILOT JET - must not be repl aced by
stan-
dard jets. To aid in identifying these three (3) jets a different design of letter and number are used.
If replacement of these close tolerance jets becomes necessary, be sure to replace them with the same
type close tolerance jets marked as in the examples shown below .
The jet needle is also of special manufacture. Only one clip position is provided on the jet needle.
If replacement becomes necessary the jet needle may only be replaced with an equivalent performing
replacement component . Suzuki recommends that Genuine Suzuki Parts be utilized whenever possi-
ble for the best possible performance and durability.
Conventional Figures Used
1
2 3
4 5 6 7
8 9 0
on Standard Tolerance Jet
Components
Emission Type Figures
I 2 :3 if
5 5
'7
B
:3 0
Used On Close Tolerance
Jet Components
The carburetor specification for the emission-controlled DR350S are as follows .
Carburetor
Main
Needle
Jet
Pilot Pilot
1.0 . No.
Jet Jet
Needle Jet Screw
14EC
PRE-SET
(California model)
# Jc~.5 5CD16
#3 ~.5
DO NOT
D· G
14E9
ADJUST
(Other state models)
The pilot screw is pre-set by the factory utilizing specialized testing and adjusting procedures. The
pilot screw is not adustable as the idle circuit is " sealed" after factory adjustment. Adjusting , inter-
ferring with , improper replacement, or resetting of any of the carburetor components may adversely
affect carburetor performance and cause the motorcycle to exceed the exhaust emission level limits.
If persons , who are unaware of these special carburetor servicing requirements tamper with the car-
buretors
the Suzuki dealer should restore the carburetors to their original condition or if unable to ef-
fect repairs , contact the distributors representative for further technical information and assistance.