Yamaha E40J - Adjusting the Throttle Stop Screw; Assembling the Carburetor

FUEL
4-9
6F65G11
Fuel system
Assembling the carburetor
1. Install the main jet 1.
2. Install the pilot jet 2, and cover to the
carburetor body as shown.
3. Install the needle valve 3, float 4, and
float pin 5, as shown, and then the
check the float for smooth operation.
NOTE:
Place the needle valve in the valve seat when
installing the float to the carburetor.
4. Install the pilot screw, turn it in until it is
lightly seated, then out the specified
number of turns.
NOTE:
9 Adjust the throttle cable whenever the car-
buretor has been disassembled or the
engine idle speed has been adjusted.
9 For adjustment procedures, see Chapter3.
5. Install the carburetor assembly.
Adjusting the throttle stop screw
1. Start the engine and warm it up for 5 min-
utes.
2. Turn the throttle stop screw 1 in direc-
tion a or b until the specified engine idle
speed is obtained.
NOTE:
9 To increase the idle speed, turn the throttle
stop screw in direction a.
9 To decrease the idle speed, turn the throttle
stop screw in direction b.
6F640070
1
6F640080
2
6F640090
53
4
Pilot screw setting:
1 —1 1/2 turns out
Pilot screw setting:
(E40J For CHINA)
1/2 —1 turns out
6F640110
a
b
1
Engine idle speed:
1,100—1,200 r/min
Main jet:
4 N·m (0.4 kgf·m, 3.0 ft·lb)