What is this lug on my frame for,gpz 550 h1/2?

there is a lug on the frame of my 550 h1/2 gpz,it it on the left hand down tube,and is approx 2 inches long and sticks up at about 50/60 degrees.on the end of it there is a black plastic cap and when removed you can put a wire down into the frame,it cant be oil in frame,cuz there is no drain plug,what is it cuz no one ive asked has got a clue,in fact no one has seen it before,is mine the only one,if so .why?,,,,ps it has not been added on later so it was factory fitted,but what for???

Answers:
Guardrail is correct.

I had a GPz550 H1 many years ago. The cable lock was not available in the UK, it was a USA only accessory. I purchased one when I was on holiday in Forida. Really useful accessory. The lock was shown in the owners handbook together with the part number. The same lock was used on most Kawasakis produced in the early '80s

It is a plastic covered steel rope with a fish-hook style barb on the end that pushed into frame. Other end was a steel D ring. To lock bike, you pulled cable out of frame, looped it through front wheel, the padlocked the D ring onto the cable.

If you want one, try ebay or emailing a Kawasaki dealer in USA.

Picture of lug and confirmation of answer here:
http://www.kzrider.com/forum/viewthread..
call the dealer and post the answer all the guys i ask do not know we can not all be dummys
Yours isn't the only bike to have that. Every GPZ550 from 84-86 has it. I can't say for sure, because I've never thought about it. Honda bikes of that era, had a similar set up. Offered with the bikes, was a "cable lock". The cable was the same diameter as the plug. When inserted into the hole, "claws" would spring out preventing the cable from being removed without the key. The other end of the cable had a loop. To lock your bike, wrap the cable around a pole, thread the end of the cable through the loop, then lock the cable into the frame of the bike. If you get a better answer, go with it.
Guardrail is correct-o.

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