The fuel tank cap for the 78 KZ650 SR was 51048-1001 and it was used on the following models
KZ650-D1 (SR) (1978)
KZ650-D1A (SR) (1978)
KZ650-D2 (SR) (1979)
KZ650-E1 (LTD) (1980)
there is also a gasket part# 11009-1053 the the cap uses.
I am also looking for this type of gas cap. I bought a project bike from a guy and the gas cap was missing. Guy told we it was a kz650 tank from early 80's. Did my research and found a replacement cap (which I thought was 51048-1001). Long story short, gas cap came in over the weekend and it is too small. It measures about 1-1/2" diameter and my gas tank opening is 2". Which gas cap model should i be looking for? Please help.
The Lucas guy obviously got the wrong fuel cap & was just guessing about the part number for the one he got.
Try searching the part number on eebbaayy >> there's 1 nos fuel cap listed. Or search the models listed above plus add fuel cap to the search or gas cap or whatever other terms you can think of. Dimecitycycles has a universal fit fuel cap, but it's probably too small. you could measure your tank to see if it might fit. the dimensions for it are listed.
identical ... it's gorgeous!
but the one found has no cover on the lock ... do you have one to sell? if yes let me see it as soon as possible and give me a price before I can no longer withdraw the order ...