Fuel Level; Pilot Screw Removal/Installation - Yamaha V star 1100 Owner's Manual

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222
14. If removed, inspect the pilot screw (Figure 70)
for wear or damage that may have occurred during
removal. Replace the pilot screw in both carbure-
tors even if only one requires replacement. This is
necessary for correct pilot screw adjustment as de-
scribed in this chapter.
15. Replace all O-rings during assembly. O-rings
tend to harden after prolonged use and exposure to
heat, which reduces their ability to seal properly.
PILOT SCREW
Removal/Installation
The pilot screw is sealed. A plug has been in-
stalled at the top of the pilot screw bore. A pilot
screw does not require adjustment unless the carbu-
retor is overhauled, the pilot screw has been incor-
rectly adjusted, or the pilot screw was replaced.
NOTE
An exhaust gas analyzer is needed to
precisely set the air/fuel mixture with
the pilot screws. If a pilot screw must
be removed, perform the procedure as
described, then have a Yamaha deal
ership perfom the final adjustment.
1. Set a stop 6 mm from the end of a 1/8 in. drill bit.
See Figure 71.
2. Carefully drill a hole in the plug at the top of the
pilot screw bore on the carburetor body as shown in
Figure 71. Do not drill too deeply. The pilot screw
will be difficult to remove if the head is damaged.
3. Screw a sheet metal screw into the plug and pull
the plug from the bore.
4. Screw the pilot screw clockwise until it lightly
seats in the bore while counting and recording the
number of turns. The pilot screw must be reinstalled
to this same position during assembly.
5. Remove the pilot screw, spring, washer and
O-ring from the carburetor body (Figure 72).
6. Inspect the O-ring and the end the pilot screw.
Replace the screw and/or O-ring if damaged or
worn (grooved).
7. Install the pilot screw assembly and turn the pilot
screw until it lightly seats in the bore. Turn the pilot
screw counterclockwise and back it out the number
of turns noted during removal.
8. Install a new plug by tapping it into place with a
punch.
70
71
9. Repeat this procedure for the other carburetor, if
necessary. Make sure to keep each carburetor's
parts separate.

FUEL LEVEL

The fuel level in the carburetor float bowls is crit-
ical to proper performance. The fuel flow rate from
the bowl up to the carburetor bore depends not only
on the vacuum in the throttle bore and the size of the
jets, but also on the fuel level in the float bowl. Ta-
CHAPTER EIGHT
Drill stop
Plug
Pilot
screw

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