How do you tell if your kfx 400 is a 2 stroke or 4 storke?

first of all learn how to spell.

Anyone with half a brain could tell it is a four stroke. A two stroke mixes the oil and the gas and a 4 stroke keeps them separate. A four stroke sounds much deeper than a two stroke. you should know this. Ever heard a banshee? that's what a two stroke sounds like.