Optical spectroscopy of the X-ray transient, GS2000 + 25 during its 1988 outburst shows that this system is similar to A0620 - 00 but at a greater distance (greater than 2 kpc). Photometry from La Palma and Russia is presented that reveals a 0.1-mag modulation at a period of 8.33 hr, associated with the orbital period. It is proposed that the modulation, which is in the form of a 'hump' in the light curve, is analogous to the mechanism of an eccentric, precessing accretion disk used by Whitehurst (1988) to account for superhumps in SU UMa systems. If confirmed, this would strengthen the relationship between the outburst behavior of low mass X-ray binaries and cataclysmic variables.