General Emission Information; Carbon Monoxide; Carburetion Malfunction; Engine Malfunctions - Suzuki GS850G Service Manual

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EMfLYSION CONTROL
R
HEGULATJONS
GENERAL
EMISSION INFORMATION
There are three different
types
of emissions. They
are:
Hydrocarbons (HC)
Carbon Monoxide (GO)
Oxides of
Nitrogen (NOx)
Automobiles
must meet
specific emission standards for all three of these pollutants. Motorcycles
must
only
meet the requirements for the following:
Hydrocarbons (HC)
Carbon Monoxide (C0)
HC exhaust emissions ate basically unburned fuel vapors which have passed through the engine
and escaped the combustion process.
CO exhaust emissions
are formed during an incomplete
combustion cycle
as
a
result
of
a rich air
fuel mixture. The only way thal CO
can
be produced is by
the combustion cycle.
Total NOx emissions from all motorcycles is considered negligible. The EPA
states
that total NOx
emission from motorcycles by 1990 will only amount
to
approximately 0.5%. NOx is formed
during the combustion process at
high combustion chamber
temperatures.
CARBON MONOXIDE
Carbon monoxide is a product of an incomplete combustion cycle. CO is measured in grams per
mile or kilometer and also in percentage (Vn)
r h e most
common
causc
o F
CO is rich
carburetion.
As
the mixture is richened excessively. the CO
amount increases proportionntcly. Engine oil
i 5
also a hyrlrocnrhon. so engine prohlenls which lead
to oil
tlurning increasc carhon
monoxide.
CARRURETION MALFUNCTION
1.
Air Cleaner-Dirty or over
oiletl.
2. Idle Mixture-Adjusted incorrectly.
3. Idle Speed-Too high or low.
4.
Fuel Level-Sticking float. leaking needle. incorrect
setting.
5.
Choke-leaking o r linkage sticking.
6. Svnchronization- I mpropcr halance
of
mu1 ti cylinders.
ENGINE MALFUNCTIONS
1. Valve
Seals-Leaking or torn.
2.
Valve
Guide-Worn and leaking
excessive
oil.
3.
Gaskets-Leaking oiI into combustion chamber.