Baph

The service schedule on the SV's is indeed every 4000miles. Expect to pay in the region of £160-200. It's a major service that includes a valve check. You'll pay more if the valves are out & need adjusting (though I don't really see why, the valves are half out to be checked anyway - but yes it is a pain to adjust them).

Chain & sprockets, I forget where I got mine from last time (B&C Express?). £104 for front 15t, rear 46t and a standard size chain. Tight fit, but it does fir on a point S.

HTH.