'81 KZ550 LTD leaky petcock bolts - Page 5 - Kawasaki Motorcycle Forums
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post #41 of 43 (permalink) Old 06-01-2017, 12:43 PM
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The inside of your tank is rusted. Water tends to collect at the bottom You'll need to treat the rust & you probably need to use a liner coating, such as Kreem, Por-15, Red Kote, KBS, etc. West System at West Marine is supposed to be a good one. Preparation is key, as is proper use of the product. any complaints you may find about any of the products are most likely from user error, not a poor product.


1981 KZ650-CSR. Competition, Sports & Road.
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post #42 of 43 (permalink) Old 06-02-2017, 08:58 AM Thread Starter
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I agree and hard to think it's not rusted. It seems like a good place for residue to build up back there at the bottom of the tank in that small space between the petcock and tank wall, especially since it amounts to a little trough almost designed to trap debris. But the underside of the cap is still nice and although you can see a few light spots of surface rust when you look in there, it doesn't seem to
be even remotely enough to worry about especially when thinking back on some of the horrendous rust piles I've seen in past tanks and they didn't even leak. Heck even when I poked the hole and expected it to just break away in an avalanche of flakes, it didn't, and the point on the pick didn't show any signs of rust but I still bet you're right and will order a kit to clean and coat it. I've had god luck cleaning things with CLR. Last year, the aluminum radiator in my hotrod was plugged and I had removed it and placed it face down
on a table then poured in a mixture of boiling water and some heavy duty radiator cleaner that's only supposed to be in there for an hour or so. I let it sit overnight and poured it out the next morning. A bunch of stuff came out but but when you looked in thru the rad cap
opening, there was still a fair amount of corrosion. At that point I figured I had nothing to lose anyhow and poured in a bunch of CLR which is not meant to be used on aluminum for more than a few minutes. I let it sit overnight again (8 and poured it out the next morning. This time the inside appeared as new. I reinstalled the thing fully expecting it to disintegrate or at least a huge gaggle of
leaks but not only were there no drips, it cooled better than ever. I'm not saying CLR is safe to use on any of this stuff, but I might
try it as a tank cleaner.

thanks for replying!
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post #43 of 43 (permalink) Old 06-03-2017, 02:23 PM
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thanks to all I enjoy reading everyone's reply cuz there r so many ways to fix 1 problem and the ideas and suggestions r really great even if I'm not dealing with this problem now I know I will some day

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