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In the title salt (2S,4S,8R)-1-butyl-2-[(R)-(hydroxy)(6-methoxyquinolin-4-yl)methyl]-8-vinylquinuclidin-1-ium tetrafluoroborate, C24H33N2O2+·BF4−, the butyl substituent at the 1-position is in an equatorial conformation with respect to the unsubstituted six-membered ring and the four butyl C atoms are almost coplanar with the ring N and vinyl C atoms (r.m.s. deviation = 0.046 Å). In the crystal, the cations are linked by O—H...N hydrogen bonds. The F atoms of the tetrafluoroborate group are disordered over two sets of site with an occupancy raitio of 0.552 (8):0.448 (8).