Re-nikasil cylinder question? Who done it?

[RXMax]

I bought a 500 from a guy that had 2 cylinders rebuilt but not installed. They stamped the cylinders underneath the intake(where reed block goes) they read 6162 6163. Any idea which company might have re-done these? I know Eickoff's stamps theirs on the side.

US Chrome?
Millenium?
??


Any ideas?

Thanks!

 

[smokingcrater]

Didn't realize any of them stamp them...? I know i've had ones redone at uschrome, and they have no stamps.

 

[mtnmaxman600]

I think its Millenium

 

[musselman]

US Chrome stamped mine on the side.