Checking Crankcase Pulse Passage; Checking Metering Lever - Echo PB-251 Service Manual

32

5-7 Checking crankcase pulse passage

5-8 Checking metering lever

FUEL SYSTEM
(A)
1. Remove carburetor and drop a little oil in pulse
hole (A) on intake insulator.
2. Remove spark plug and pull starter grip several
times. Oil should spit back from the hole.
3. If not, remove intake insulator and gasket from
cylinder. Check gasket for misassembly or remove
oil residue clogging pulse passsages in intake insu-
lator and cylinder.
4. Install gasket, intake insulator and other remain-
ing parts to cylinder.
1. Remove metering diaphragm cover, metering dia-
phragm and gasket.
2. Check metering lever height.
Metering lever height: 0.1 to 0.25 mm (0.004 to 0.010
in) lower than diaphragm.
3. If necessary, gently bend metering lever up or
down to set the metering lever to proper position.
NOTE: When metering lever is:
Too high → Fuel flooding
Too low → Fuel starvation
PB-251