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Seven years of pulse time-of-arrival measurements have been collected fromobservations of the young pulsar PSR B2334+61 using the Nanshan radio telescopeof Urumqi Observatory. A phase-connected solution has been obtained over thewhole data span, 2002 August to 2009 August. This includes a very large glitchthat occurred between 2005 August 26 and September 8 (MJDs 53608 and 53621).The relative increase in rotational frequency for this glitch,$\Delta\nu_{g}/\nu~\sim~20.5\times10^{-6}$, is the largest ever seen. Althoughaccounting for less than 1\% of the glitch, there were two well-definedexponential decay terms with time constants of 21 and 147 days respectively.There was also a large long-term increase in the spindown rate with$\Delta\dot\nu_p/\dot\nu \sim 0.011$ at the time of the glitch. A highlysignificant oscillation with a period of close to one year is seen in thepost-glitch residuals. It is very unlikely that this can be accounted for by apulsar position error or proper motion -- it appears to result from effectsinterior to the neutron star. Implications of these results for pulsar glitchmodels are discussed.

A very large glitch in PSR B2334+61