Inspecting Crankcase Pulse Passage; Inspecting Metering Lever Height - Yamabiko ECHO PB-2520 Service Manual

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6-8 Inspecting crankcase pulse passage

A

6-9 Inspecting metering lever height

B
FUEL SYSTEM
1. Drop a little oil in pulse hole (A) on intake insula-
tor.
2. Remove spark plug and pull starter grip several
times. Oil should spit back from the hole.
3. If not, inspect whether pulse passage is clogged.
Repair or replace as required.
1. Remove carburetor.
2. Remove metering diaphragm cover, metering
A
diaphragm and gasket.
3. Inspect metering lever (A) height by slide gauge (B).
Metering lever height:0.1-0.25 mm (0.004-0.010 in)
D
lower than diaphragm seat (D)
4. If necessary, gently bend metering lever up or
down to set metering lever to proper position.
NOTE: When metering lever is:
Too high
Too low
Fuel ooding occurs
Fuel starvation / overheating occurs
PB-2520
EB252