If you are going to,"Winterize" then read here,
http://www.acf-50.co.uk/motorcycle.htm
http://www.ebay.co.uk/itm/ACF-50-Mot...IAAOSwdjNZCEQT
but if at all possible still take the bike out once a month for a run.Engines and Electrics like to be used.
Also I add some Redx fuel treatment(Asda or Wilkos sell it) to my fuel.As I often work away for periods it helps prevent the fuel from going stale as well as keep the fuel system clean.
I also keep my SV on a Battery Tender,
http://www.ebay.co.uk/itm/Oxford-Oxi...gAAOSw~OdVVjk7
as I've fitted a fused SAE connector to my battery so can just plug it in when needed.It tucks up under the rear fairing,
Also I totally agree with the,"Engine Braking" and once added to your skills,especially on cornering,is an absolute joy