Hello all new guy here and have an interesting question. I have a new to me YZ which one I hope you can tell me. The title says 2000 in one area and 2005 in another the nomenclature is MX480. I see a non-stock cylinder in there and gent I bought it from says a big bore was put on. My guess is it's an 05 YZ450 with a big bore to a 480. Is there any way to confirm this visually? Thanks.