60C5D11
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Technical tips
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Carburetor
Prime start
To facilitate the starting of a cold engine, an air-fuel mixture that is richer than normal is required.
For this reason, the Prime Start system has been adopted in the F100B and F100C. In the Prime
Start system, the thermo heater plunger is in a position that fully opens the fuel enrichment valve
while the engine is being started. Thus, fuel enrichment is achieved during the starting of the
engine, and continues while the engine is being warmed up. Once the engine is started, a signal is
sent from the pulser coil to the CDI, and from the CDI to the Prime Start to allow the wax to expand.
The expanded wax moves the thermo heater plunger in the direction to close the enrichment valve.
As a result, the volume of fuel that passes through the fuel enrichment valve decreases. A few min-
utes after the engine has started, the thermo heater plunger completely closes the fuel enrichment
valve, thus ending the fuel enrichment by the Prime Start system.
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Prime Start
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Carburetor #1/#3
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Carburetor #2/#4
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Fuel enrichment valve
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Thermo heater plunger
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Air
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Fuel
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Air-fuel mixture
Features and benefits
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