Oops, I forgot to mention warm-up rpm shouldn't exceed about 3,000.
A few more thoughts... YS and OS have never used Chrome with the possible exception of some limited production racing engines by OS. The Italian engine manufacturers (Rossi, OPS, SuperTigre, etc.) did use chrome, I do not know if they still do.
Chrome is harder than Nikasil which is desirable in the very high rpm racing engines used in C/L speed, FF, and pylon racing. Chrome is more expensive and harder to apply than Nikasil and produces very EPA unfriendly byproducts. If I can find my notes I'll share any other pertinent tidbits.
happy Flying - low and fast!
Will