Section 05 FUEL SYSTEM
Sub-Section 04 (CARBURETORS)
05-04-7
NOTE:
Pressure test should be performed three
times to obtain a valid reading.
If pop-off pressure is not within specification,
check control lever adjustment. Replace spring as
necessary.
LEAK TEST
Needle valve must stand a pressure of 69 kPa
(10 PSI) for 30 seconds. Otherwise, hold carbure-
tor upside down, pour oil over needle valve and
apply pressure.
Check for bubbles. If they come from seat or
O-ring, bubbles will exit around seat. Retighten as
necessary.
If it still leaks remove needle and seat and replace
O-ring.
If bubbles come from needle, replace needle and
seat.
9,10, Main Jet and Pilot Jet
Pilot jet and main jet are replaceable. Different jet
sizes are available to suit temperature and altitude
conditions. Always inspect spark plug tip condi-
tion when dealing with pilot jet and main jet. Spark
plug tip condition gives a good indication of carbu-
retor mixture setting.
NOTE:
To have access to pilot jet or main jet,
check valve housing must be removed.
TYPICAL
1. Pilot jet
2. Gasket
3. Main jet
4. Check valve housing removed
11, Check Valve Assembly
The check valve is needed if a back pressure oc-
curs into carburetor. It will prevent fuel from flow-
ing back into carburetor lower portion.
Inspect check valve, it should be free of holes,
tears or imperfections. Replace as needed.
1. Check valve
NOTE:
Prior to check valve assembly installation,
remember to set gasket.
3,12, Diaphragm and Cover
Install diaphragm with its integrated O-ring into
carburetor groove. Make sure that the tab of cov-
er is inserted into carburetor notch.
-
CAUTION
Do not stretch or cut spring.
-
CAUTION
Adjustments vary with temperature and alti-
tude. Always observe spark plug condition
for proper jetting.
1
F01F11A
2
3
4
F01F12A
1
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