It wouldn't surprise me in the least to have some oil consumption when going 75 at higher rpms for a day , I've heard of that from all singles . The piston speed is high enough that more oil getting by the rings is normal . The usage should go down once running at low rpms and the amount used at high rpms varies quite a bit . Probably one of the #1 reason for cooked cam journal in these big single from lack of oil comes from a day of high rpm running , catches people off guard.
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