2011 Polaris Ranger RZR ATV Service Manual, Page 128Get this manual

2011 Polaris Ranger RZR ATV Service Manual, Page 128

ELECTRONIC FUEL INJECTION Upper Rear Gearcase Bolt FUEL INJECTORS Operation Overview NOTE: All EFI units utilize quick connect
the pressure in the fuel rail forces fuel down through the insideThe "director plate" at the tip of the injector contains
series of calibrated openings which directs the fuel into the intake port in cone-shaped spray patternThe amount of fuel
injected is controlled by the ECU and determined by the length of time the valve needle is held open, also referred to as
the "injection duration" or "pulse width"It may vary in length depending on the speed and load requirements of the engineThe
ECU gathers fuel injection timing information from the Crankshaft Position Sensor and Camshaft Phase Sensor to allow for
sequential fuel injection NOTE: multi-directional torque wrench is required in this application because of the limited access