A 2005 250 2x4 has an oil filter.
Make sure you get the right info before doing any work.
Don't trust everything you read here.
Purchase a shop manual before you do any damage.
http://www.motocom.com/motorcycles/|||There is an oil filter.
|||There is a drain bolt on the underside
It should have a 148cc next to the fill cap|||take it in to get it the oil change|||I hear you take old oil out and put new oil in the oil tank