Auto-Enrichener System
Remote models are equipped with an auto-enrichener system.
FUEL SYSTEM
CARBURETOR OPERATION
The automatic enrichener device consists
of
the PTC heater, the thermo-wax, and the plunger/needle.
When the thermo-wax is cold, the plunger/needle moves upward, and fuel is drawn into the enrichener
circuit from the
float chamber.
Enrichener jet meters this
fuel, which then flows into fuel pipe and mixes with the air coming from the
upper part of the float chamber. The mixture, rich
in
fuel content, reaches upper part of the fuel pipe and
mixes again with air coming through a passage extending from main bore.
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 into the main bore.
When the engine is
cold:
•
The auto-enrichener passage is open when the thermo-wax is at atmospheric temperature.
When the engine is started:
• As PTC heater temperature increases, the thermo-wax gradually expands and closes enrichener pas-
sage with the
needle of the plunger.
A
PTe
heater
B Thermo-wax
1. Plunger/needle
2. Float chamber
3. Enrichener jet
4. Fuel pipe
5.
Upper float chamber
6. Main bore
7. Starter outlet port
..
FUEL +AIR (MIXTURE)
..
FUEL
111
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