My 2001 WR426 bit off a few valve heads and seized the piston to the cylinder. What do you think would be the best rebuild route? Buy a used 2000 WR 400 engine and install it in the bike? Buy a used 2000 YZ 426 and sell off the rest of the parts besides the engine and install the flywheel, etc off the WR for lighting on the bike? Or should I send the cylinder to be renikasiled and the crankshaft to be rebuilt with a new rod and get a used head? Any advice would be greatly appreciated.