  A search for narrow resonances that decay into t-tbar pairs has been
performed using 130 pb^{-1} of data in the lepton+jets channel collected in
p-pbar collisions at \sqrt{s} = 1.8 TeV. There is no significant deviation
observed from the standard model, and upper limits at the 95 % confidence level
on the product of the production cross section and branching fraction to t-tbar
are presented for narrow resonances as a function of the resonance mass M_X.
These limits are used to exclude the existence of a leptophobic topcolor
particle with mass M_X < 560 GeV/c^2 and width \Gamma_X = 0.012 M_X.
