Suzuki VX800 1990-1993 Service Manual 10 Emission control system

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1 EMISSION CONTROL CARBURETOR COMPONENTS ..-..---.lO- 1

EVAPORATIVE EMISSION CONTROL SYSTEM . - - - - -a . -. . - - - -a - . lo- 2
CANISTER HOSE ROUTING

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10-l

EMISSION CONTROL INFORMATION

EMISSION CONTROL CARBURETOR COMPONENTS

VX800

These carburetors require special mixture control components and other precision adjustments to function
properly.

There are several carburetor mixture control components in each carburetor assembly. Three (3) of
these 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 replaced by Stan­dard 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 possible
for the best possible performance and durability.

Conventional Figures Used
on Standard Tolerance Jet
Components

Emission Type Figures
Used On Close Tolerance

jet Components

motorcycles are equipped with precision, manufactured carburetors for emission level control.

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The carburetor specification for the emission-controlled VX800 are as follows.

(California model)

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, interferring
with, improper replacement, or resetting of any of the carburetor components may adversely affect
carburetor performance and cause the motorycle to exceed the exhaust emission level limits. If per­sons, who are unaware of these special carburetor servicing requirements tamper with the carburetors
the Suzuki dealer should restore the carburetors to their original condition or if unable to effect repairs,
contact the distributors representative for further technical information and assistance.

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