Hello, so I recently bought a 1993 Sportsman 400 off marketplace and I was wondering if it was a 2-stroke or a 4-stroke? On the gas cap it does not say that it needs mixed fuel and then on the front of it, it has an oil Tank. The last owner said he did not remember if it was 2 or 4 stroke because he didn’t use it for a couple years.... I was thinking it was a 4-stroke because it has the separate oil tank at the front. I just want to check before I put straight gas in it.