Evaporative Emission Control Inspection; Rollover Valve Removal/Installation - Yamaha V star 1100 Owner's Manual

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9. Replace any component that is worn, damaged
or out of specification.
EVAPORATIVE EMISSION CONTROL
(CALIFORNIA MODELS)
All models sold in California are equipped with
an evaporative emission control (EVAP) system,
which reduces the amount of fuel vapors released
into the atmosphere. The system consists of a char-
coal canister, rollover valve, solenoid valve, as-
sorted hoses, and modified carburetors and fuel
tank. A schematic of the emission control system is
on a special label on the right frame downtube.
The EVAP system captures fumes that are created
in the fuel tank and stores them in a charcoal canis-
ter. See Figure 101. While the motorcycle is parked
or when it is operated at low engine speeds, the fuel
vapors remain in the charcoal canister. When the
motorcycle is ridden at high speed, the vapors pass
through a hose to the carburetor and are burned.
The rollover valve, which is installed in line be-
tween the fuel tank and charcoal canister, assures
that the fumes remain in the canister until they can
be safely burned. The gravity-operated rollover
valve is opened and closed by an internal weight.
During normal riding (when the motorcycle is up-
right), the weight keeps the valve open so fuel va-
pors can flow from the tank to the charcoal canister.
When the motorcycle is leaned over (like when it is
parked on the sidestand), the weight closes the
valve so vapors stored in the canister cannot flow
back into the fuel tank and escape into the atmo-
sphere.
Inspection
Maintenance to the evaporative emission control
system consists of inspecting the condition and
routing of the hoses, making sure the canister is se-
curely mounted to the engine mounting bracket, and
testing the EVAP solenoid valve. No attempt should
be made to modify or remove the emission control
system.
WARNING
Because the evaporative emission
control system stores fuel vapors,
make sure the work area is free of
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flames or sparks before working on
the EVAP system.
1. When servicing the evaporative system, make
sure the ignition switch is off.
2. Make sure all hoses are attached and are not
damaged or pinched.
3. Replace any worn or damaged parts immedi-
ately. Replacement parts must be specific to Cali-
fornia models.
4. The canister is capable of working through the
motorcycle's life without maintenance provided
that it is not damaged or contaminated.

Rollover Valve Removal/Installation

1. Remove the toolbox cover and the side cover
from the left side of the motorcycle.
2. The rollover valve sits in-line with the hose that
connects the fuel tank to the EVAP canister. The
rollover valve (A, Figure 102) is mounted on the
toolbox panel, just forward of the solenoid valve
(B).
NOTE
The toolbox panel has been removed
for photographic clarity. The rollover
valve can be serviced while the panel
is installed on the motorcycle.
3. Remove the screw (Figure 103) and release the
rollover valve from the clamp that secures it to the
toolbox panel.
4. Release the hose clamps, pull the hoses from the
valve fittings, and remove the rollover valve.
5. Installation is the reverse of removal. Make sure
the hose clamps are tight.
CHAPTER EIGHT