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TOPIC: Retroactive KZ750E Project Thread

Retroactive KZ750E Project Thread 10 Oct 2018 17:01 #792139

  • JohnLuke
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I guess what I’m asking is, do I have to mask off the area ? Or can I just scuff the area I want and that way when I spray it won’t have those ridges or whatever. Meaning the paint will blend together...... I think.

Thanks!

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Retroactive KZ750E Project Thread 12 Apr 2019 18:12 #802009

  • jeffz
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Ed,
I just read this thread. Excellent job on it, and of couse the bike! I’m surprised more people don’t do project threads after the fact,
like you did. There is so much going on during, why add to the workload? Too much at once!
You tackled such a wide range of tasks, you did everything.
I never saw someone make their own flexible brake lines; didnt even occur to me that it could be done. I guess you just wanted to
do it ? You can get the correct lines factory made, right?
Having owned a 1980 model of your bike, I can see why your efforts were worthwhile. It was the closest thing to a perfect
motorcycle I’ve ever ridden; better than a KZ 1000.
Congrats, and thanks for sharing.
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Retroactive KZ750E Project Thread 14 May 2019 13:17 #803869

  • calum
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Hi Ed. Just wondering if you soda blasted the block as well as the head? Did you soda blast to avoid beads getting everywhere or was it just better for getting the cooling fins?
I ask as I am planning on bead blasting the block, head and valve cover together. I'll put the old gasket in and use a couple of long bolts to hold the head and block together going through a bit of wood across the bottom of the cylinders. I figure this way nothing will get inside the cylinders or galleys and I can go mental with the blasting. I'll clean up the inside with some petrol as I won't be doing any work on the top end (only 30,000 km and the compression and leak down tests were OK - will give it another 30,000 and them pull it apart again).
Do you see any problems with this approach? Would you use soda or glass beads?

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Retroactive KZ750E Project Thread 14 May 2019 14:02 #803873

  • Nessism
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calum wrote: Hi Ed. Just wondering if you soda blasted the block as well as the head? Did you soda blast to avoid beads getting everywhere or was it just better for getting the cooling fins?
I ask as I am planning on bead blasting the block, head and valve cover together. I'll put the old gasket in and use a couple of long bolts to hold the head and block together going through a bit of wood across the bottom of the cylinders. I figure this way nothing will get inside the cylinders or galleys and I can go mental with the blasting. I'll clean up the inside with some petrol as I won't be doing any work on the top end (only 30,000 km and the compression and leak down tests were OK - will give it another 30,000 and them pull it apart again).
Do you see any problems with this approach? Would you use soda or glass beads?


Hi Calum,

Soda blasting everything is a good idea. Soda will dissolve with water so if any gets into the internal passages it won't be as serious a concern as it is with glass or sand grit. I'd still tape up the openings to not tempt fate, particularly on the head. The recessed oil passages are difficult to clean unless you are brave and drill out the galley plugs. On my project I only used soda on the head but with hindsight it would have been a good idea to use it on everything to save masking time.

Good luck
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Last edit: by Nessism.

Retroactive KZ750E Project Thread 15 May 2019 05:53 #803898

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Thanks Ed.
Ordered some soda blast media today. Will get the sand out on the weekend for the swingarm and frame fittings, then the glass beads for the fork tubes, engine covers and steering head. After that the soda should be there and I can get the block done.

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Retroactive KZ750E Project Thread 15 May 2019 06:45 #803901

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Soda disintegrates on impact and largely turns to dust. Blasting in a cabinet creates a dust cloud with poor visibility (in my cabinet anyway). If you soda blast outdoors the remnants can kill plants. Don't ask me how I learned this.
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Retroactive KZ750E Project Thread 15 May 2019 06:49 #803902

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OK, will do a test run in the cabinet and if I can't see enough I'll find a workshop somewhere - or may buy my wife some more plants ;)

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Retroactive KZ750E Project Thread 16 May 2019 09:47 #803984

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Before I get started, what pressure did you run while soda blasting the head? And did you blast the sealing faces, valves etc?
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Retroactive KZ750E Project Thread 16 May 2019 17:35 #803994

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calum wrote: Before I get started, what pressure did you run while soda blasting the head? And did you blast the sealing faces, valves etc?


100 psi for the blasting. You need some pressure because soda is not overly aggressive. You won't hurt the valve seats but again, I'd keep as much grit out of the oil passages as possible.
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