Suzuki GS1100G 1982 Service Manual page 314

GENERAL EMISSION INFORMATION
There are three different types of regulatd exhaust emissions. They
are:
Hydrocarbons (HC)
Carbon Monoxide
(CO)
Oxides of
Nitrogen
I 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
(CO)
HC exhaust ernisions are basically unburned fuel
vapors which have passed through the engine
and es-
caped the combustion process.
CO exhaust emissions are formed during an incomplete combustion cycle as a result of a rich aidfuel
mix-
ture. The only way that CO can be produced is by the combustion cyde.
Total NOx emissions from all motorcycles is considered negligible. The EPA states that total NOx emis-
sion from motorcycles by 1990 will only amount to approximately 0.5%. NOx is formed during the com-
bustion 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
I%).
f he most common cause of CO is rich carburetion. As the mixture is rfchened excessively, the CO amount
increases proportionately. Engine oil is also a hydrocarbon, so engine problems which lead t o oil burning
increase carbon monoxide.
CARBURETION MALFUNCTION
1. Air Cleaner- Dirty oroveroiled.
2.
ldle Mixture
-
Adjusted incorrectly.
3. ldle Speed
-
Too high
or
low.
4. Fuel Level
-
Sticking float, leaking needle, incorrect setting.
5. Choke
-
Leaking or linkage sticking,
6.
Synchronization
-
Improper balance on multi cylinders.
ENGINE MALFUNCTION
1. ValveSeals-
Leaking
or
torn.
2.
Valve Guide
-
Worn and leaking excess oil.
3. Gaskets - Leaking
oil into combustion chamber.