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V7III has a six speed with an oil pump and holds 500cc as I recall.The V85 holds 700 cc and has no punp. I would assume that is the 6 spd in the V7-850.
75W-90 or 75W-140 should act/feel the same when cold or under normal operating conditions. Its doubtful the transmission gets anywhere hot enough to warrant the need for the thermal protection 140 oil offers.