P 1
1
/ 1
6
See
Figs. 29 and 30
for the positions of Needle-idle (L)
and Needle-high speed (H) .
After tightening each Needle to the full;
•
unscrew Needle-idle (L) one and a half turns.
•
unscrew Needle-high speed (H) four turns.
Note
: Adjust the rpm from the above setting positions
with 1R070.
Fig. 29
Fig. 30
R
epair
Needle adjustment
Pressure test
General check
[2] DISASSEMBLY/ ASSEMBLY
[2]-10. Air filter, Carburetor, Intermediate flange (cont.)
Fig. 31
Fig. 32
(S)
L
H
(1) Connect 1R127 to Carburetor. (
Fig. 30
)
(2) Push up the air pressure until the pressure gauge indicates
0.05 Mpa.
(3) The carburetor is in order if the air pressure can be kept for
10 seconds.
Note
: If the air pressure drops, check the following conditions.
• V
alve-inlet needle: if necessary, Spring, Lever-metering,
Pin-metering lever, and Plug-welch have to be replaced
together. (
Fig. 31
)
•
Dirt/ deposits on the top of Valve-inlet needle: clean it.
•
Gasket pump and Diaphragm-pump: replace them
with the new ones.
•
Inlet screen should be clean.
•
Pulse hole should be clean.
Check around Valve-inlet needle and Lever-metering
Check Diaphragm-pump
Check Diaphragm assembly-metering
Refer to
Figs. 31
and
32
.
Check that the tip of
Valve-inlet needle is not worn.
Replace it the new one if it looks worn.
Check that Lever-metering is not worn and it is assembled
properly as drawn in
Fig
.
30
.
Note
: Low position of Control lever causes;
• Insufficient fuel circulation
• No maximum power
High position of Control lever causes;
• Carburetor flooding
• Starting problems
• Poor idling
•
Poor acceleration
If necessary, reassemble them properly / replace them with
the new ones.
•
When Diaphragm-pump is dented, torn, or creased,
•
When the valve flaps of Diaphragm-pump are bent,
replace Diaphragm-pump and Gasket-pump with new ones.
• (i)
When Diaphragm assembly-metering is dented, hardened,
or torn,
(ii) If there is a visible wear on the button of Diaphragm
assembly-metering
•
If Diaphragm assembly-metering lacks elasticity,
replace Diaphragm assembly-metering and Gasket-metering
diaphragm with the new ones.
Connect 1R127
to the fuel nipple.
1R127
Push
Carburetor
Spring
Plug-welch
Lever-metering
Pin-metering lever
Valve-inlet needle
Inlet screen
Diaphragm-pump
Gasket pump
Gasket-metering
diaphragm
Diaphragm
assembly-metering
Pulse hole
Screw-idle adjustment (S)
Needle-idle
L
Needle-high speed
H
Correct
Too high
Too low
(Position of Lever-metering)
