KTM came out with the XC-4 500cc motor in 2008, characterized by separating the engine and gearbox oiling chambers. There were a lot of running changes to the motor in the subsequent years, thus 2011 parts for the same XC-4 motor are desirable improvements on a 2008.
The oil pump shaft, gears, and main oiling jet can be upgraded with new OEM parts.
New oil pump shaft is longer
Main oiling jet steps up from 100 to 125
new oil pump gears, OEM plastic
new oil pump seal
Manolo al Sol 
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