The excited vibrational states of gaseous cyclopentene 3-HC5D7 have been measured up to Delta v = 7. The second overtone presents essentially two main absorptions corresponding to two distinct conformers. The higher overtones are much perturbed by Fermi resonances with low-energy modes. The contribution of two types of couplings to the ring-puckering motion and to isoenergetic states involving low-energy modes are analyzed and modeled. Through the reconstruction of the spectra, the predominant pathways of the intramolecular vibrational redistribution of the energy (IVR) are discussed,