Section05FUELSYSTEM
Subsection 01 (CARBURETOR)
1
F01F34B
2
LOW LEVER
1. Depress here
2. Pry up here
POP-OFF Pressure Test
Proceed as follows:
– Install the pump gauge tester (P/N 295 000 114)
on carburetor fuel inlet nipple.
– Obstruct fuel return nipple with a finger.
– Pump tester until inlet release pressure is
reached (seen by a sudden pressure drop).
F01F10A
1
2
3
TYPICAL
1. Pump gauge tester
2. Install on inlet nipple
3. Obstruct outlet nipple
Refer to the following table for pop-off pressure
specifications:
MODELS
POP OFF PRESSURE
min./max. kPa (PSI)
GTI 248/414 (36/40)
NOTE: Pressure test s
hould be performed three
times to obtain a v
alid reading.
If pop-off pressure is not within specification,
check control lever adjustment. Replace spring
no. 14 as necessary.
CAUTION: Do not stretch or cut spring.
Leak Test
Needle valve no. 3 must stand a pressure of
69 kPa (10 PSI) for 30 seconds. Otherwise, hold
carburetor 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.
Main Jet and Pilot Jet
Pilot jet no. 15 and main jet no. 16 are replaceable.
Different jet sizes are available to suit temperature
and altitude conditions. Refer to HIGH ALTITUDE
BULLETIN for more informations. Always inspect
spark plug tip condition when dealing with pilot jet
and main jet. Spark plug tip condition gives a good
indication of carburetor mixture setting.
CAUTION: Adjustments vary with temperature
and altitude. Always observe spark plug con-
dition for proper jetting.
NOTE: To have access to pilot jet no. 15 or main
jet no. 16, check valve housing must be removed.
smr2005-052 91
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