Fuel System: 1G-8
Transient Enrichment System
The transient enrichment system is a device which keeps fuel/air mixture ratio constant in order not to generate
unstable combustion when the throttle grip is returned suddenly during high speed driving. For normal operation, sum
of the air (1) and (2) keeps proper fuel/air mixture ratio.
But when the throttle valve is closed suddenly, a large negative pressure generated on cylinder side works on to a
diaphragm (3). The valve (4) on the diaphragm closes the air (1), therefore, the fuel/air mixture becomes rich with fuel.
This system is to keep the combustion condition constant by varying the fuel/air mixture ratio by controlling air flow.
1
2
“C”
“A”
“B”
I827H1170043-01
“A”: Air “B”: Fuel/Air mixture “C”: Fuel
3
4
1
2
“C”
“A”
“B”
I827H1170044-01
“A”: Air “B”: Fuel/Air mixture “C”: Fuel
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