15
8. Remove the primer bulb (if equipped) by
grasping with a pliers and pulling and twisting
out of the body. Remove the retainer by prying
and lifting out with a screwdriver. Do not re-
use old bulb or retainer (diag. 28).
9. Remove all welch plugs if cleaning the
carburetor. Secure the carburetor in a vise
equipped with protective jaws. Use a small
chisel sharpened to a 1/8" (3.175 mm) wide
wedge point. Drive the chisel into the plug to
pierce the metal and push down on the chisel
to pry the plug out of the hole (diag. 29).
32
1 - Body, Impluse
2 - Body, Pump
3 - Cover, Pump
4 - Bearing, Spring
5 - *Valve, Check (2)
6 - *Gasket, Pump Cover
7 - *Diaphragm, Pump (2)
9 - Screw, 1-1/4" (4)
10 - *Spring, Pressure
11 - *Filter, Air
NOTE: DO NOT REMOVE ANY BALL OR CUP PLUGS (diag. 29).
10. Note the direction of the inlet fitting. If necessary the inlet fitting can be removed by pulling with a pliers
or vise, do not twist. The fitting must be replaced. Tap a 1/4-20 thread inside the metal shank, use
1/4"-20 bolt and nut inserted into a 1/4" (6.350 mm) flat washer and 1/2" (12.700 mm) nut, thread the
bolt into the shank, and thread the nut down to pull out the shank.
11. The Walbro LMK carburetor main fuel jet can be removed only if the jet is damaged or if a high altitude
jet is needed to be installed. To remove place the carburetor firmly in a soft jawed vice. Using a punch
the same size or slightly smaller than the jet, drive the jet through and into the center leg. Insert the
high altitude jet in the same hole. Using a punch slightly larger than the diameter of the new jet, tap it
into place flush with the outside of the center leg casting (diag. 31).
28
30
31
29
WELCH PLUG TO
BE REMOVED
PIERCE PLUG
WITH TIP
DO NOT ALLOW
CHISEL POINT
TO STRIKE
CARBURETOR
BODY OR
CHANNEL
REDUCER
ABOUT 1/8"
(3.175 mm)
WIDE
BALL PLUG
IDLE FUEL PASSAGE
REDUCTION ROD INSIDE
BRASS OR BALL PLUG
DO NOT REMOVE PLUGS
HIGH SPEED JET
ATMOSPHERIC
VENT
WALBRO LMK SERIES
PRY OUT
PLUG
SMALL
CHISEL
SMALL CHISEL
Impulse Fuel Pump
The valve type impulse pump can be serviced using
the following procedure.
1. Remove the old filter on the back of the pump
body if applicable.
2. Note or mark the pump body alignment, remove
the four screws and disassemble the pump.
3. Remove the gaskets, diaphragms, old valves
and spring bearing from the spring.
4. Clean the body parts with solvent.
5. Install new valves with the face of the valve
facing the raised portion of the passage. After
installation, cut off the extended portion of the
valves.
6. Install the diaphragms against the center portion
of the body with the gaskets against the outside
covers. The parts can only can be assembled
one way without damage.
7. Install the spring bearing on the new spring and
place into position.
8. Assemble the body sections, install the retaining
screws, and torque the screws to 12 - 16 inch
pounds (1.36 - 1.81 Nm).
9. Install new filter in pump cavity if applicable.
9
3
6
8
11
5
2
11
1
10
7
4
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