I just picked up a 2002 YZ426 with a seized engine. The seller said that he changed the oil prior to the last ride, and lo and behold- criiick- the engine stops running after every last drop of oil runs out of the oil tank through the hole that used to have a plug in it. I confirmed that the engine is stuck by trying to depress the kick lever, and nothing happened. I will be attempting to turn the crank later today, but I know that I need to rebuild the engine so what's the hurry, right? Right now every bearing and the oil pump are suspect and will be replaced. I assume that the piston, cylinder and cams need some attention, just because no oil= plenty of heat= friction welding of incompatible materials. The transmission and clutch seem to work, as I can shift into gear with the clutch lever pulled in and the bike will roll with minimal drag while in gear and lever pulled in. But I am not an expert (by any stretch of the imagination), so here are my questions: Besides the above mentioned items, what else should I look at? Is there a "Kit" oil pump available? If so, is it worth it? Aftermarket bearings or OEM? What about gaskets? Any vendor out their better than OEM? If the piston and cylinder are toast, are the big bore kits any good? I have no problem going OEM for parts, I prefer that over taking my chances with aftermarket items if possible. Since I don't know how many hours are on this engine, what else should I be looking at doing while the cases are open? I understand that I have Ti valves, should I replace? If I do replace, should I install steel valves? Thanks for your attention on this, and sorry for the amount of questions first thing out of the gate. And, I'm in Seattle so if anyone knows of local shops to do work like replating the cylinder or doing some crank work, let me know.