Just bought a used 400EX with WB E-Series exhaust 13 disks, WB Rev Kit and K&N Filter. Everything else is stock. What should proper jetting be? Also, What is best technique for cleaning rusted chain?

 

not sure what your jetting should be at(need to know your altitude and if your airbox is modded) just check your plug. as for a rusted chain i would go get a new one. or suok it in chain cleaner or something like that

 

Sea Level, no airbox mods. Everything else is stock.