My 1999 curvy had 16k miles on it when I got it.It had a bit of a top-end chain rattle.It went as soon as I put fresh Motorcycle oil in(Motul Ma2),
http://www.ebay.co.uk/itm/1x-4L-MOTU...sAAOSwd~RZPvn2
I smoothed my engine more with a little Moly(MoS2) but some people don't want to do this and on such a low mileage engine you shouldn't need it.
I've got some,"Smith and Allen" 10w40 semi synthetic motorcycle oil to try(Read the reviews).
https://www.smithandallan.com/produc...emi-synthetic/
Around £19 inc delivery for 5 liters.
and will be doing an oil change soon as I've clocked over 3,000 miles now and like to do pre-emptive oil changes.