Bean oil (as in Castrol R) was once the premium racing oil before synthetics came along, but as you said you are going for a riding weekend I'm assuming you are not racing. For trail riding, unless they've added some miracle ingredients, it may gum up the PV quickly and leave messy hard to clean carbon deposits, and plug up exhaust packing.
It used to really be meant for racing engines that are run hard, torn down regularly, and mixed fairly rich too.
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