KZR's Bikes of the Month for 2024

Rusty Tank 1978 KZ750 Twin

  • KZQ
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  • Walking Behind the Corn May Not Be All That!
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02 Jan 2023 08:46 #878449 by KZQ
Replied by KZQ on topic Rusty Tank 1978 KZ750 Twin

 Would any lingering WD40 mess up the fuel lines or carbs when it flows through the system?
 
No

www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300

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02 Jan 2023 08:50 #878450 by DanMadBoy
Replied by DanMadBoy on topic Rusty Tank 1978 KZ750 Twin
Awesome! Thanks so much!!

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  • Kelly E
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02 Jan 2023 09:27 #878451 by Kelly E
Replied by Kelly E on topic Rusty Tank 1978 KZ750 Twin
I've derusted a bunch of gas tanks. I use EvapoRust and rinse with diesel to prevent flash rust. Once the EvapoRust is done pour in a gallon of diesel, shake it around and drain into an old clear milk jug. Wait a few minutes and the sludge will settle to the bottom. Pour the diesel back in for another round and dump the sludge. It takes a few rinses to get it clean and when done the diesel coats the tank to prevent flash rust and it won't hurt anything when you fill it up with gas.

The Rust Bros. Garage Collection
1974 Honda CB 550 K0
1975 Honda CB 400F Super Sport
1977 Kawasaki KZ 1000 LTD
1980 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda Sabre 700
1984 Honda Interceptor 1000
1990 Moto Guzzi 1000
1994 Kawasaki ZG 1000 Concours

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02 Jan 2023 09:30 #878452 by DanMadBoy
Replied by DanMadBoy on topic Rusty Tank 1978 KZ750 Twin
Thank you for this Kelly.
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02 Jan 2023 10:27 #878454 by Nessism
Replied by Nessism on topic Rusty Tank 1978 KZ750 Twin
It seems that everybody has a slightly different method on how to clean a tank.  Keeping with that thought, my preference is to use phosphoric acid (Kleen Strip Metal Prep, or Etch and Clean, as sold by Home Depot.)

First step is to clean any varnish, because you can't strip though varnish.  For removing varnish, some carb dip or at least some carb spray is needed.

Fashion proper seals for all the various openings, don't use the petcock, fuel cap, or sending unit.  Use metal plates with rubber seals, or a rubber stopper.

Phosphoric acid can be diluted quite a lot and still be effective.  One gallon, followed by topping up the tank with water works well.

It will take some time to eat off all the rust, and during that time be sure to allow the tank to outgas, or the sides of the tank will pooch out.

When the rust is gone, dump the sauce and quickly rinse with a garden hose.  Next, shoot a bunch of WD-40 in the tank and swish it around.  That will reduce flash rust to just a tiny bit.

To dry the tank, I use a hair drier blowing into the filler opening.  Don't cram the drier into the hole, let it blow from a few inches away, and come out the petcock opening.  Done this way, the tank will be fully dry in less than half an hour.  Use compressed air first, to get out any standing water or remnant WD-40
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02 Jan 2023 10:30 #878455 by DanMadBoy
Replied by DanMadBoy on topic Rusty Tank 1978 KZ750 Twin
This is all very helpful. Thank you so much. Im learning a lot (Im 19)

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02 Jan 2023 12:48 #878458 by martin_csr
Replied by martin_csr on topic Rusty Tank 1978 KZ750 Twin
To reduce flash rust you could use fogging oil to fog the tank after doing the rust treatment.  I think the stuff is commonly used for snowmobiles.

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02 Jan 2023 12:54 #878459 by DanMadBoy
Replied by DanMadBoy on topic Rusty Tank 1978 KZ750 Twin
Thanks Martin. You know of any good brands of fogging oil? Ive never heard of it.

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02 Jan 2023 15:33 - 02 Jan 2023 15:43 #878465 by Moose1800
Replied by Moose1800 on topic Rusty Tank 1978 KZ750 Twin
Here's what I use, and as Kelly said diesel is a great alternative to prevent flash rust. That bike looks great, take care of it body parts are hard to come by these days. You owe your uncle many thanks for giving you such a nice bike, also you should change the oil and filter before start up if the bike has sat for a long while.......Welcome to KZR!

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Last edit: 02 Jan 2023 15:43 by Moose1800.
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02 Jan 2023 18:22 #878468 by DanMadBoy
Replied by DanMadBoy on topic Rusty Tank 1978 KZ750 Twin
How often do you change your oil filter?

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03 Jan 2023 07:08 - 03 Jan 2023 07:10 #878476 by TexasKZ
Replied by TexasKZ on topic Rusty Tank 1978 KZ750 Twin
Every time the oil is changed.
Be sure to use motorcycle-specific oil that is designed for wet clutches. Unlike cars and trucks, Japanese motorcycle engines have a common sump, meaning that the engine, transmission and the clutch share the same oil. Automotive oils include friction reducers that can damage the clutch plates. Look for the JASO-MA certification on the bottle to be sure. Some Diesel engine oils like Shell Rotella also carry the JASO-MA certification. Also buy a high quality filter. Genuine Kawasaki filters and NAPA Gold filters are good choices.

In case you do not have a hard copy, here is a digitized factory service manual.

www.kzrider.com/modules/ServiceManuals/K...l%20KZ750%20Twin.pdf

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24
Last edit: 03 Jan 2023 07:10 by TexasKZ.

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03 Jan 2023 07:15 - 03 Jan 2023 07:18 #878477 by martin_csr
Replied by martin_csr on topic Rusty Tank 1978 KZ750 Twin
Just an FYI. Shell Rotella T 15W-40 regular in the white bottle has the JASO-MA rating for Japanese motorcycles. The rotella is a heavy duty oil marketed for diesel engine use & has the same type of anti-wear ingredients as motorcycle-specific oils. Chevron Delo & Valvoline Premium Blue are a couple of other heavy duty oils, but the Shell product typically goes on sale &/or is usually cheaper. Delo sometimes goes on sale. Only caveat is that the 15W40 may not be suitable for cold weather starts.

ps: fogging oil is fogging oil. probably nothing special to look for.
Last edit: 03 Jan 2023 07:18 by martin_csr.

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