Im looking at buying a 400ex with blaster engine in it. What are some things i should look for before i decide to buy it?? I like the idea of a 400ex with a 2-stroker in it. has a trx 250r fmf pipe renthal chain and spockets pro taper bars, pro disign kill switch,18" rear kenda klaws and 19" makkis razrs in front and maire race scooped hood