01 Jetting starting point?

I am cleaning out the carb on my ridding buddies 01 yz250f and wondered if the stock jetting is a good starting point for riding in Portland, Oregon. It is like 55 deg, rain and elevation is around 400-1000 feet depending on where we ride. Anyone have good sttings in this area I can start at or should I put it to stock and go from there? He's running pump gas.

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