Re: NGK BP6HS-10 Spark Plug
the "recommended" 16:1 ratio is an outdated reference left over from the original instructions based on 30weight oil the germans used when they built these motors in the 50's. the chinese not only copied the engines, but the instruction manual, too, without taking into account the advances in oil after 60+ years.
many of us have run 24:1, 32:1, and even opti2 at 100:1 during break in with great results.
but if it works for you, go for it...