Have a look at bagster tank covers and their bags.

I've used the dzeta 20liter for years on my super tenere with a full tank cover. Real easy just to unhook in 4 places to refuel.

http://www.baglux.co.uk/search/?keyword=xt660z&brand=0

http://www.bs-motoparts.com/Gepaeck/...n&currency=gbp

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2011 Yamaha XT660Z ABS T�n�r�.

• Puig +8cm dark screen, Garmin Zumo 220, Scottoiler eSystem v2
• Barkbusters Storm with external weights, Noname 30mm bar risers & EzMoto alu. levers
• Kev's O2 Controller, Mccoi stepless controller with Hein Gericke heated grips
• TT +4cm seat, Pivot Pegs, Altech stainless sprocket cover