FUEL SYSTEM 4-23
AUTO-ENRICHENER SYSTEM
Only the remote control model is equipped with an auto-enrichener system.
The automatic enrichener device consists of the PTC heater A, the thermo-wax B and the plunger/needle
1. When the thermo-wax B is cold, the plunger/needle 1 moves upward, fuel is drawn into the enrichener
circuit from the float chamber 2.
Enrichener jet 3 meters this fuel, which then flows into fuel pipe 4 and mixes with the air coming from the
upper part of the float chamber 5. The mixture, rich in fuel content, reaches upper part of the fuel pipe and
mixes again with the air coming through a passage extending from main bore 6.
The two successive mixings of fuel with air are such that proper fuel/air mixture for starting is produced
when the mixture is sprayed out through outlet port 7 into the main bore.
When the engine is cold:
The automatic enrichener passage is always open as the thermo-wax remains atmospheric temperature.
When the engine is started:
According to the PTC heater temperature, the thermo-wax gradually expands and closes enrichener pas-
sage by the needle of the plunger.
AIR
FUEL+AIR (MIXTURE)
FUEL
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