Only problem I had with mine was the power valves didnt work when I got it. Common problem on nsr's, powervalves get coked up and seize which burns out the power valve servo motor and fries the power valve circuit in the pgm. If yours has only done 5000km then it shouldnt be a problem, the first job i would be doing on it would be a power valve clean though just to be on the safe side.

I had the 21r for a couple of years, sold it to Dan (geckoracing) when I bought my 21sp. Also got another mc21r in bits and a mc28sp in bits.