Hi I just picked up a used OS max 46 a few months back for $80.00 buck wow what a nice running engine! I did notice the piston seems to be a little discolored but I don't see any flaking and this engine just purrs like my other brand new AX 35 and 25 and seems to have ample power for my purpose. I had a OS XZB blue head verson one that I ran about 3 gallons of fuel through before I sold it for a new version 2 which is mounted in my car and hasn't been fired yet!
Michael Johnston