oil pump on a xr50

I got a used 2003 xr50 with a 88 big boar kit on it , and the guy I bought it from did not put in a better oil pump. I got a hi flow oil pump, and was woundering how hard was it to put on? how do I do it?

You have to pull the head and jug to drill a hole bigger. Two brothers was good directions on their site.

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