2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 44Get this manual
6Install two O-rings, one alignment pin, and the oil pump on the right-side crankcse half; then secure with three cap screws tightened to specifications 8Install the right-side crankcase cover seal with seal driver or socketApply light coat of grease around the oil seal lip
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! CAUTION
Take care that the locating pin (small pin) and the alignment pin (larger bushing) engage the oil pump and crankcase properly or damage to the engine will occur
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9Install new gasket and two dowel pins on the right-side crankcase halfNOTE: The two contact surfaces must be clean before installing the gasket
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7Install the oil pump gear with the flange nutTighten the nut to specifications