Inspecting Crankcase Pulse Passage; Inspecting Metering Lever Height - Yamabiko ECHO SRM-420ES Service Manual

SRM-420ES, SRM-420TES
T410S, B410S
T410TS, B410TS

4-7 Inspecting crankcase pulse passage

A

4-8 Inspecting metering lever height

A
E
FUEL SYSTEM
1. Remove pulse pipe (A) from carburetor and drop
a little oil on the end of pulse pipe (A).
2. Remove spark plug and pull starter grip several
times. Oil should spit back from the end.
3. If not, remove oil residue clogging pulse passag-
es in cylinder.
NOTE: Place pulse pipe (A) horizontally to keep
dropped oil in the pulse pipe.
1. Remove carburetor.
B
2. Remove screws (A), metering diaphragm cover
(B), metering diaphragm (C) and gasket (D).
C
D
3. Inspect metering lever (E) height by Metering
lever gauge 897563-19830 (F).
Metering lever height: 1.65 mm (0.065 in) lower
F
than diaphragm seat (G).
1.65mm
E
G
4. If necessary, gently bend metering lever (E) up
or down to set metering lever to proper position.
NOTE: When metering lever is:
Too high → Fuel fl ooding occurs
Too low → Fuel starvation / overheating occurs
33 33
diaphragm seat (G)