If you remove the 4 bolts holding the plastic cover onto the front corner of the clutch cover (right side of the quad sitting on it). The oil pump is located under that cover.
The "poor man's" way of blocking off the oil injection system is to remove the clutch cover itself, pop the e-clip off the delrin gear, remove the drive pin and gear from the shaft, and reinstall the clutch cover. Once the oil pump is no longer connected to the crankshaft you can leave it under the cover (the plastic one with the 4 bolts in it) and it won't hurt a thing OR remove the pump from the clutch cover itself and install a blockoff plate. The blockoff plate simply takes the place of the pump after it is removed so that transmission fluid is retained in the bottom end.