Emission Control Ca Rburetor Components - Suzuki DR350 Service Manual

EM ISSION CONTROL CARBU RETOR C O M PO N ENTS
DR350S motorcycles are equipped with precision, m a nufactured carburetors for emission level con­
tro l . These carburetors require special mixture control components a nd other percision adjustments
to function properly .
There are several carburetor m ixture control components in each carburetor assembly. Three (3) of
thses components are machined to much c loser tolerances than standard machined carburetor jets.
These three (3) particular jets - MA I N J ET, N EEDLE J ET, PI LOT J ET - must not be replaced by stan­
dard jets. To aid in identifying these three (3) jets a d ifferent design of letter and n u m ber a re u sed .
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 shoVVn below.
The jet needle is a lso of special m anufacture . Only one clip position is provided on the jet needle.
If replacement becomes necessary the jet needle m ay only be replaced with a n equivalent performing
replacement component. Suzuki recommends that Genuine Suzuki Parts be utilized whenever possi­
ble for the best possible performance and d urability .
Conventional Figu res Used
on Standard Tolerance J et
Components
Emission Type Figu res
U sed On Close Tolerance
Jet Components
The carburetor specification for the emission-control led D R 3 50S are as follows.
Carburetor
I . D. No.
1 4EC
(California model)
1 4E 9
(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 Suzu ki dealer should restore the carburetors to their original condition or if unable to ef­
fect repairs, contact the d istri butors representative for further technical information al"ld assistance .
1 2
3
I 3
2
Main Needle
Jet Jet
# / 2'7.5 0 - 5
DR350 P/SP ('93·M O D E L) 1 2·20
4 5 7
6
Lf 5 5 r-,
Jet Pilot
N eedle Jet
# 3 '7. 5
5 C D 1 6
8 9 0
B 0
9
Pilot
Screw
PRE-SET
D O NOT
ADJ U ST