Hey guys I’m new to this forum. I just bought a 2004 400ex from a co worker. It has a blown motor. I believe it has a bent valve because the cam chain tensioner was messed up but I’m thinking of completely rebuilding with a 440 big bore kit. What additional upgrades will I need to do to acompany the bigger bore. The carburetor is also missing so I will need a whole new one. Thanks.