I expect someone will be along with an exact recommendation in due course but keep in mind a hi spec 125 will typically subject those small end washers to 5000 odd G's about 200 times a second so will destroy anything but a "tough" metal so that rules out copper , ally , and brass and possibly nickel silver (do you know the % of the mix? ). I know the last 1000rpm used to shorten the life of the hardened steel ones used in some of the 80's race bikes. what stroke and rpm are you looking at?
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