Look up specs on 8620. Good toughness and case hardening characteristics.
I don't know the reasoning for the cc shortening, but I hope you considered the effect on balance and harmonics. If this is a 2-stroke engine, the high engine rpm potential can put you into "shattering mode". Somewhere there is a bunch of clutch parts orbiting the earth. I've never determined where they landed or if they ever did. LOL
Dick Z
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