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Hi!
So I got a Z650 D4 /SR 1981 and I just noticed the gas tank is leaking or atleast is about to very soon. It's slightly moist. The tank currently on doesn't look like the SR tank but more like the LTD one, is this the same model used on z550 z750 and so on?

So it looks just like there used to be a petcock
on the right side of the tank and someone moved the petcock to the left side and filled that hole up with epoxy or something that started melting. Did the LTD have the petcock on the right side for some reason?

Any chance to remedy this, any tip on how to? Or if a new tank is a better option, what could be a good option?

Thanks!

Ops, wrong forum section, sorry about that!

Assuming it is a KZ fuel tank, the petcock would have always been on the left side. What you are seeing on the right side was most likely the port for the fuel gauge. If that is the only place that is leaking and you don't plan to install a fuel gauge you may be able to replace the epoxy with a bolt and gasket or just have that hole welded shut. Ed

The right side hole would be for a fuel level sender. You could fab up an aluminum plate to replace the missing (I presume) sender. Install it with a new gasket and be done. Don't ride it before fixing this. The epoxy may suddenly let go completely and the result could be disastrous.

I don't believe that model was sold in the U.S., so maybe some our European friends can help identify the tank.

Thanks guys!
Great info and that really does make sense that there is supposed to be or can be a fuel gauge there and that is what has been plugged up.
The tank is not a SR / D4 standard so might be a LTD one but I have no idea really.
Anyway I'll be careful and try the steps mentioned by you and hope I can fix it soon enough.

Thanks again, really appreciate it!

I would try to find an SR fuel tank as it will probably have a greater capacity, although probably not by much.
An Ltd tank probably only holds just over 3 gallons or about 12 liters of fuel, while the SR capacity is 14 L.
The SR coffin tank is kind of neat & certainly distinctive.

Fuel Level Switch & Brake light outage switch.

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Thanks Martin,
So the CSR and LTD tank are pretty much the same correct?

So what does the Fuel Level Switch hook up to? And is that connected to the Brake light outage switch?
Sorry but I have never heard of this before
Thanks!

The KZ750H Ltd fuel tank is the same capacity as my 81 KZ650-CSR, about 12.4 L.

The fuel level switch & outage indicator switch plug into the wire harness at 2 different connectors. The fuel level switch is fairly simple >> when the fuel level drops below the little can, the sensor or thermistor in the can warms up then allows current to flow & illuminates the warning light. I guess that's how it works.

The outage indicator switch flashes the stop lamp when there's a problem with the brake light circuit, such as a bad bulb. The owner's manual should describe what sort of warning or indicator lights your bike should have & how they function. On my bike the low fuel warning & stop lamp share the same warning light.
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Thanks!
I'll try to fix the tank for now and if I run into those parts maybe I'll swap them in down the line. Thanks for the info, I'll check the user manual for more info!

Just curious. Does your fuel tank have a bolt that secures the rear of the tank to the frame? That's what my CSR & the 750H Ltd have. Some models have a tab that fits into a frame grommet (but no bolt).


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So this is how it looks on the bike now. Through that hole goes a long bolt that has been welded on to the tank and is secured by a nut.
Managed to dropped the tank trying to drain it so now it's even uglier haha. Good excuse to get it repainted I guess.
To me the frame looks untouched, so an SR tank should just bolt on right?
Thanks!

Thanks. It sounds like the fuel tank has been rigged to fit the motorcycle & I doubt the stock SR tank will install in the same manner. Instead of a round damper, an oblong damper is supposed to fit into that large opening in the frame & the tank tab drops into the damper. The 750H Ltd & 650-CSR fuel tanks have a bolt that threads into a threaded hole in the frame & the bolt is installed horizontally or parallel to the ground.


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