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1973 Z1 Maui 03 Oct 2022 03:46 #874936

  • kzstreetfighter71
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Amazing. Mr Hannibal Williams is some kind of wizzard, i would love to have seen the process, did he use a dent puller or cut the shell off, panel beat then re weld. Either way sterling work!
06 Gsf 1200 bandit, 08 Triumph tiger 1010
05 Yam xv1700 , 02 Hon shadow 1100
1975 Z1 (currently working on)
1977 Z1000 ( running and in storage)
1978 Z1000 (currently working on)
1978 Z1r "skinny tank" (currently working on)
1978 Z1r "fat tank (gathering parts)
1979 z1000st (currently working on)

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Last edit: by kzstreetfighter71.

1973 Z1 Maui 03 Oct 2022 14:39 #874962

  • MauiZ1
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He pulled it with studs. I’m waiting for some in process photos of his work, he’s a real pro.

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1973 Z1 Maui 03 Oct 2022 17:09 #874967

  • Mikaw
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That’s amazing body work.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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1973 Z1 Maui 12 Apr 2023 15:01 #882985

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So what's NEW with this project. have you got it sorted

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1973 Z1 Maui 12 Apr 2023 16:49 #882994

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I’ve had a long bit of distraction with some other projects at the house along with extensive handwringing. My current theory is that using my experience with my 73 Honda 750 may have actually contributed to or caused my issue. On the Honda (higher pressure, lower volume oil system, 60 psi) I cranked on the battery, no plugs, (on initial start) until the oil light went out and oil showed up everywhere. On the Z1 with low pressure high volume I may have been dissipating the assembly lube while waiting for the oil pressure to come up while cranking on the battery with no plugs. I’ve been back through all the oil passages with the cases split, blown air, peered in holes, and put fluid through trying to find a problem. I purchased another pump which measures about the same as the original. 
I’m about to start reassembly and then I’ll hold my breath and start it.
If it still has the same problem I’m not sure what I’ll do, all options will be considered. I really want this thing to run and I really want to ride it but the reality is I’m not sure that will happen.
thank you for asking.

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1973 Z1 Maui 12 Apr 2023 16:58 #882995

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Another thought
the cam chain pulls the cams down potentially blocking the oil holes in the saddles but wouldn’t the valve springs push the cams up off the bottom into the tops of the shells thus allowing oil to flow?
im hoping my problem is the pump which I have now changed since I cannot find anything wrong.
 

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1973 Z1 Maui 12 Apr 2023 17:57 #882998

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What is the problem ?
The CB750 is a high pressure system because of the insert main bearings.
The Z1 is a low pressure system because the crank has roller bearings.
The chain is not tight enough to pull the cams down, when the cam lobe contacts the shim the spring pushed the cam up.
 

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1973 Z1 Maui 12 Apr 2023 18:10 #882999

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Upon initial startup the cams did not get enough oil and some were damaged. 

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1973 Z1 Maui 12 Apr 2023 19:31 #883003

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The only oil flow bottle neck in your case could be the cylinder studs clearance. The cam bearnigs have a lot of play any way and have to feed with oil at first through the oil galerie.
 

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1973 Z1 Maui 14 Apr 2023 20:30 #883167

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I run APE studs on all of my builds. Two of the engines I ran a 1/2 drill down those passages and the other 5 I left stock. I got a tad more area from the 1/2 inch drill . APE does not suggest any modification to the stud bores on the z1. The hole that actually feed the head are fairly small in comparison the the area in the cylinder minus the stud. Never had a problem with any of the engines. I am starting to worry about the 73 Z1 I'm about to install new cam shells in. The shells I have I believe were bought from Z1E as were the previous sets. The current set was marked on the bag made in Taiwan with no marking on the shell itself. I don't think any of the sets I purchased were original Kawasaki parts. So my plan is to check the clearance before the head goes on. And to crank the engine (plugs out) and see oil delivered to the top end before installing the cover. I have never done this on any of the Z1 builds (about 9) and yes it did take a few seconds for oil to appear on the top end as I could hear my Liska sprockets quite down, so you have me paranoid.

I think you mention your shells came from Z1E. I hope you have success on this start up

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1973 Z1 Maui 15 Apr 2023 10:09 #883186

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Hi MauiZ1, it's the damn camshaft bearings, they ruined my engine too.
1977 Kawasaki KZ1000 A1
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1973 Z1 Maui 15 Apr 2023 17:28 #883200

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Well after seeing two people with problems with the cam shell bearings I decided to re-order the correct OEM bearings from Japan. This is probably my last Z1 build so I don't need problems. I still plan on checking clearances.

If anyone needs a set from Taiwan I will sell 16 of them for a good price. The person I bought them from used gloves when handling and a close up shows a chamfer center hole and you can see a definite material difference from the bottom steel shell to the actual bearing surface.

Keep us posted Maui.
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