Fire dammaged 1973 Z1 engine.

  • kzstreetfighter71
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 14:02 - 07 Jan 2022 14:03
#860194
wrote:
The vin stamp is not factory.
The case bolts were changed, I'll think about it at dinner.
 
Thanks 73z1 any help is always appreciated and you seem to know your 73Z1's

 
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)
Last edit: 07 Jan 2022 14:03 by kzstreetfighter71.

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  • zed1015
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 14:22
#860196
Those cams are fast road Kent Cams.
Got a set myself.
Time them at 110 LC's.
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 14:30 - 07 Jan 2022 14:30
#860198
wrote:
Those cams are fast road Kent Cams.
Got a set myself.
Time them at 110 LC's.


Thanks mate, ye this engine seems to be built right, with right parts, thats why id love to track down who built it and for what. Ill probably have it down to the crank by Sunday.
 
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)
Last edit: 07 Jan 2022 14:30 by kzstreetfighter71.

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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 15:10
#860209
wrote:
The vin stamp is not factory.
The case bolts were changed, I'll think about it at dinner.


 So its is definitely a restamp on a later case as the plate is 80mm where it should be 65m for a low number Z1. Ah well.. the cases are still sound and i have a home for them in the future, not the pedigree i was looking for but the engine as a whole is sound.
 
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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  • hardrockminer
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 16:01
#860218
The longer pad was introduced around S/N 27,000.  The early font was used until about 34,000, which is when they added the lip.   The lower right case photo shows that the cases are Z1 or early Z1A.  Putting all this together suggests it was an early Z1A case produced after S/N 27,000 but before 34,000.The photo below shows the lower right corner on a Z1B.  This bolt pattern was also used on later Z1A's.  But as I mentioned above it was different for Z1 and Z1A. 
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 16:22
#860224
I agree with HRM. Good thing is it’s a Z1 engine. Bad news the value is only in the parts. As a whole engine restamped it’s value is gone. Definitely it’s a restamped. The “E” is wrong and the “9”. 
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
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  • 73z1
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 18:16 - 07 Jan 2022 18:17
#860230
The two bolt case appeared at z1e-34000 ?

[img
Last edit: 07 Jan 2022 18:17 by 73z1.

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  • hardrockminer
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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 19:44
#860231
wrote:
The two bolt case appeared at z1e-34000 ?

It was roughly mid way through the Z1A run.  I don't know the exact number but around the same time as the serial number font change.

[img
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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Re: Fire dammaged 1973 Z1 engine.

07 Jan 2022 21:46
#860234
The whole font is wrong on the stamp.
1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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  • 73z1
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Re: Fire dammaged 1973 Z1 engine.

08 Jan 2022 06:20
#860246
"It was roughly mid way through the Z1A run.  I don't know the exact number but around the same time as the serial number font change."
This is a mystery, I was vaguely aware the case changed but no idea when, investigation is needed.
74 ran to Z1F-47499, mid way is Z1F-33749

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Re: Fire dammaged 1973 Z1 engine.

08 Jan 2022 06:43
#860248
Here is engine Z1E-33330 with 73 type case.

 

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Re: Fire dammaged 1973 Z1 engine.

08 Jan 2022 06:46
#860249
Here is engine Z1E-42357 top case is modified, lower case is 73 style

 

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