Yamabiko ECHO SRM-420ES - Replacing Welch Plug; Replacing Purge Bulb

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SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS
FUEL SYSTEM
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4-11 Replacing welch plug
If engine does not run smoothly even after read-
justing carburetor and inspecting carburetor parts,
inspect low speed ports on carburetor as follows:
1. Remove metering lever and related parts to pro-
tect them from damage.
2. To remove welch plug (A), punch the remover
tool (B) through welch plug at low angle and pry it
out.
NOTE:
Remover tool (B) is included in welch plug
tool 500-500.
3. Clean low speed ports with compressed air.
4. Place a new welch plug over the opening and
gently tap it until fl ush using welch plug installer (C).
5. Install all removed parts to carburetor body.
4-12 Replacing purge bulb
1. Remove carburetor. Disconnect fuel return line
(A) from purge bulb.
2. Remove purge bulb (B) with insulator plate (C),
(D) and cable holder (E).
3. Remove purge bulb (B) from insulator plate (C).
4. Install new purge bulb to insulator plate (C) en-
gaging notch (b1) with groove (c1) as shown.
5. Connect fuel return line (A) to purge bulb.
6. Reinstall removed parts.
A
B
C
B
C
b1
c1
B
D
A
C
E