FUEL SYSTEM / CARBURETION
4.11
Float Chamber Venting
Fuel flows through a carburetor by creating a pressure difference between the venturi and the float bowl. The
greater the pressure difference, the greater the fuel flow. On some models the float bowl is vented to the handle-
bars. This provides consistent atmospheric pressure for a consistent fuel flow. If the vent lines become kinked,
plugged, or exposed to fluctuating pressures (under hood) the pressure difference will change, causing erratic
fuel flow.
Polaris has airbox venting on some models. The vent lines are connected to a baffle inside the airbox. This pro-
vides a more consistent pressure difference between the carburetor venturi and the float bowl as the vacuum
inside the airbox changes. For example, if the airbox foam filter becomes restricted with snow when riding in pow-
der, the airbox vacuum increases. Without airbox venting, the pressure difference would increase substantially,
choking or flooding the engine. With airbox venting, the pressure difference remains the same, creating a slightly
leaner mixture to compensate for reduced air flow.
Vent Line Routing
(Opposite Carb to Handlebar)
Atmospheric
Pressure
Fuel
Some Models Have
Interconnecting Lines Between each Carb
Flow
Direction
Through
Valve
Tee Fitting
One Way
Check Valve
Drain Hose
Carb.
Carb.
Air Box
Some models have airbox venting
Tee Fittings Are
Orientated Vertically
Baffle Tube
Содержание 600 EDGE RMK
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Страница 273: ...SUSPENSIONS 7 12 EDGE RMK Exploded view Front Torque Arm Rear Torque ARm ...
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