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We present the first results of a photometric survey of poorly studied novaremnants in the Northern Hemisphere. The main results are as follows: DM Gemshows a modulation at 0.123 d (probably linked to the orbit) and rapidvariations at ~22 min. A moderate resolution spectrum taken at the time of thephotometric observations shows intense HeII 4686 and Bowen emission,characteristic of an intermediate polar or a SW Sex star. Variability at 0.127d and intense flickering (or quasi-periodic oscillations) are the main featuresof the light curve of CP Lac. A 0.1-mag dip lasting for ~45 min is observed inGI Mon, which could be an eclipse. A clear modulation (probably related to theorbital motion) either at 0.179 d or 0.152 d is observed in the B-band lightcurve of V400 Per. The results for CT Ser point to an orbital period close to0.16 d. Intense flickering is also characteristic of this old nova. Finally, XXTau shows a possible periodic signal near 0.14 d and displays fast variabilityat ~24 min. Its brightness seems to be modulated at ~5 d. We relate this longperiodicity to the motion of an eccentric/tilted accretion disc in the binary.Comment: 9 pages, 15 figures, accepted for publication in Astronomy &  Astrophysics. The resolution of Figs. 4 and 6 has been degraded to fit  astro-ph file size limitation

Time-resolved photometry of the nova remnants DM Gem, CP Lac, GI Mon, V400 Per, CT Ser and XX Tau