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GENERAL INFORMATION 1-15
Technical Information – KAWASAKI LOW EXHAUST EMISSION SYSTEM
Since the emission regulations become more severe, Kawasaki has adopted a type of simplified
KAWASAKI LOW EXHAUST EMISSION SYS TEM (KLEEN), which have no catalyst protection sys-
tem, according to each regulation of different countries.
The muffler with built-in catalyst has the same durability as the conventional muffler, however, do
not use l eaded gasoline and do not coast with the ignition system OFF. Running the engine without
ignition damages catalyst.
Refer to the ZX900E Service Manual (Part No. 99924–1255) for more information about the K LEEN
(theory, maintenance, and handling precautions), including the secondary air injection system.
Honeycomb Type Catalytic Converter
○
The converter is a three-way catalytic converter, and its surface is covered with alumina upon which
platinum and rhodium are applied, and has a cylindrical metallic honeycomb structure made by
bending a corrugated sheet and a flat sheet of stainless steel into a spiral of increasing diameter.
The honeycomb structure is convenient for t he catalytic converter because it has a l arge surface
area but small size to react effectively and has low exhaust resistance. In addition, its inherent
strength helps resist vibration, and has simple structure welded directly on the silencer.
○
Generally, the temperature of the exhaust gas must be higher than activation temperature, so the
converters are installed in the exhaust manifold rear end where the temperature of exhaust gas is
still high. And, the converters will be activated even under low load conditions.
○
After the exhaust gas is diluted with the secondary air injection, the catalytic converter works well
because of rich oxygen to reduce CO, HC, and NO
x. Accordingly, we can keep the exhaust gas
emission within regulation.
○
This type of converter works more efficiently as a three-way catalytic converter to r educe CO, HC,
and NO
x than the pipe type catalytic converter because of its more and denser catalysts.
1. Manifold
2. Silencer
3. Honeycomb Type Catalyst
4. Mark for Manifold
5. Mark for Silencer