Recently me and friends have constructed a chopper with an Ultima 127 c.i. ( 2092.00 cc) engine. The muffler is self-made, polished and covered with copper-nickel-chrome protective and decorative electroplating coating.
The problem is that after the first starting the muffler changed its color. It became kinda of colors of the rainbow.
Have anyone ever seen something like that? What can be the reason?
Thank you a lot in advance.