Excuse the stupid question however have just bought my first zx11 and cant seem to open the fuel cap. Bofore you give me the standard answer of use the key I have. Are there two keys for the zx11 one for ignition and one for fuel.
They are the same key for both, unless one of them have been replaced on your bike. While turning the key, try pushing on the cap with ther other hand; this removes a lot of friction in the mechanism. I always do this when opening mine (ZX-11 too).