Makita PM7650H Technical Information page 19

R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-12. Carburetor section
REMOVING CARBURETOR
(1) Remove Air cleaner cover complete from
Air cleaner plate by unscrewing M5x25
Pan head screw. (Fig. 56)
(2) Remove Air cleaner element. (Fig. 58)
(3) Remove two M5x70 Pan head screws that
fasten Air cleaner plate and Carburetor to
Cylinder head complete.
Note: Completely remove the two screws
from Air cleaner plate or Carburetor cannot
be removed from Cylinder head complete.
(4) Remove two tubes from Carburetor,
then remove Carburetor from Cylinder head
complete.
DISASSEMBLING/CLEANING CARBURETOR
(1) Remove Metering diaphragm cover, Metering diaphragm and Metering diaphragm gasket by unscrewing four Screws.
(Fig. 58)
Note: If Metering diaphragm gasket is sticking on the adjacent part, remove it with care as it is easily broken.
(2) Check Metering diaphragm for shrinkage, hardening or breakage due to aged deterioration.
If any, replace it with new one.
(3) The inner parts of Pump body assembly can be removed by removing (+) M3x4 Screw.
(4) Before mounting the inner parts of Pump body assembly in place, make sure that the tip of Inlet needle is neither worn
nor deformed. (Fig. 59)
Note: The inner parts are not available individually. If you need some of the inner parts, order Pump body assembly.
(5) When mounting Control lever, make sure that the upper end of Spring is firmly held in place under the projection of
Control lever. (Fig. 60)
(6) Fully loosen Idle adjust screw, then remove two M3x10 Pan head screws.
(7) Make sure that Inlet screen is not clogged, then set it back in place.
(8) Spray carburetor cleaner in all the fuel lines of Carburetor, then after several minutes, wash out dirt and debris with
clean gasoline.
Fig. 58
M3x10 Pan head screw (2 pcs)
Throttle valve assembly
Pan head screw
Fig. 59
with good tip with worn tip
An Inlet needle with
worn tip can cause
a pressure leak.
Fig. 56
Pump diaphragm
Pump gasket Inlet screen
Inner parts of Pump body assembly
Pin
Inlet needle Spring
Fig. 60
Correct assembling
of the inner parts of
Pump body assembly
Metering diaphragm
Control lever
Spring
Inlet needle
Pump body assembly
Metering diaphragm gasket
Metering diaphragm
Control lever
Wrong examples
Debris in valve seat can
cause a pressure leak.
P 19/26
Fig. 57
Metering diaphragm cover
Screw (4 pcs)
Control lever is not
parallel to
Pump body assembly.
The upper end of Spring
is out of place.