Thanks for the advice Fred,
I took the tensioner off today, to find that,
instead of adjusting the tensioner manually as you suggested or replacing the cam chain, the previous owner had tack-welded a nut to the end of the tensioner shaft, giving it an extra 7mm in length.
So I guess this means replacing the cam chain tensioner and the chain.
I'm surprised at what seems like premature wear of the cam chain though.
The bike's odo says it has only done 18000km and the rest of the bike seems to echo this:
No play in the swing arm or other bearings, no scratches/dings on the bash plates/side covers, no oil leaks, no wear showing on the rockers/valve stem tops and the whole bike is relatively clean as well.
Geoff
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