Adjusting The Throttle Stop Screw - Yamaha F25C Service Manual

FUEL
2. Install the needle valve 5, float 6, float
pin 7, and screw 8 as shown, and then
the check the float for smooth operation.
6
NOTE:
• Place the needle valve in the valve seat
when installing the float to the carburetor
body.
• Fit the float pin into the slit on the carbure-
tor body and lock it with the screw.
3. Install the pilot screw 9, turn it in until it
is lightly seated, then out the specified
number of turns.
Pilot screw setting:
1 5/8–2 5/8 turns out
4. Install the carburetor assembly.
5. Connect the throttle link rod to the carbu-
retor throttle lever.
6. Turn the throttle cam 0 clockwise until it
contacts the stopper A, and then hold it
in that position.
4-13
Fuel system
7
5
8
S6D54120
NOTE:
For remote control models, the throttle cam
cannot be turned unless the remote control
lever is shifted to forward.
7. Turn the throttle lever B clockwise so
that the throttle valve is fully open.
8. Tighten the screw C.
9. Operate the throttle cam to check that
the throttle valve fully opens and fully
closes.

Adjusting the throttle stop screw

1. Start the engine and warm it up for 5 min-
utes.
Engine idle speed: 925–1,025 r/min
2. Turn the throttle stop screw 1 in direc-
tion a or b until the specified engine
idle speed is obtained.
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