[Water Warrior 2]

It is best to have the engine warmed a bit to thin out the oil so it drains more readily. In your case I would just change it regardless of temp. That said.....when you add the new oil, fill it to the full mark with the bike upright. After you do get it started and running the level may go down. Check it after the bike has been shut off for a couple minutes to see where the actual level is.
Did you get moto specific oil? A regular car oil will not do the bike any good. Shell Rotella(diesel) will work wonderfully and one of the cheapest on the market. It has no mollifiers in it to mess up the clutch plates just like a moto specific oil. Great success in 2 of our bikes. Carry on Iffy.