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73 Z1 mutt/mixed breed Build
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09 May 2024 09:27 #898782
by Coyote
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
73 Z1 mutt/mixed breed Build was created by Coyote
Decided to go ahead and start my 73 Z1 build thread since technically I've already started. I'm starting with a 73 powder coated frame and swingarm and a 73 motor that came from a different bike. A NOS OEM Kawasaki gas tank I was told was manufactured in 83 and a 73 rear wheel assembly missing the sprocket hub. I've got the cases split on the engine and so far have only had use two or three outer gear bearings from a '76 motor I've torn down to replace rusty ones on the 73 that was missing the inner and outer sprocket covers. All clearances in the crank and the gearbox that I could measure are all within normal limits. I'm in case prep mode now and will hopefully get it reassembled in about a week.
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
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09 May 2024 09:29 #898783
by Wookie58
Replied by Wookie58 on topic 73 Z1 mutt/mixed breed Build
keep us updated
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09 May 2024 09:35 #898786
by Coyote
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
Will do
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
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09 May 2024 09:55 #898789
by Coyote
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
One thing I'm concerned with is that this bike has been bored out considerably to 69.86 mm. Should I worry about engine balancing?
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
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09 May 2024 10:04 #898790
by Wookie58
Replied by Wookie58 on topic 73 Z1 mutt/mixed breed Build
I don't see why "balancing" should be an issue, others that know these motors inside out will be able to advise around "safe" overbore limits in regard to liner thickness however a "J" has a stock bore of 69.4mm for 998cc's so I don't think it's excessive (only my opinion) but the likes of Zed1015 will better be able to advise
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09 May 2024 10:08 - 09 May 2024 10:09 #898791
by Injected
Replied by Injected on topic 73 Z1 mutt/mixed breed Build
Very common modification on Z1 engine was to overbore with KZ1000 pistons (70mm) to achieve 1015cc. Stock Kawasaki cast pistons are usually marked as "ART" on the insides, if not they may be aftermarket forged usually at a higher compression. No issues with that engine size similar to all stock Kawasaki 1000's.
Last edit: 09 May 2024 10:09 by Injected. Reason: sp
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09 May 2024 10:15 #898792
by Mikaw
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.
Replied by Mikaw on topic 73 Z1 mutt/mixed breed Build
Interesting build. I thought about a “mutt” build as I have about 80% of what would be needed. Your 70mm is considered 1015 which is the standard Kz1000 bore size so you’re good. No worries.
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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09 May 2024 10:25 #898794
by Coyote
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
Replied by Coyote on topic 73 Z1 mutt/mixed breed Build
No markings on the inside. The top of the Pistons are stamped COOK6 and a bunch of numbers. Glad to hear about the balancing.
77 KZ 1000 A
21 Z900 RS
Project 73 Z1
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09 May 2024 11:07 - 09 May 2024 11:09 #898797
by Mikaw
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.
Replied by Mikaw on topic 73 Z1 mutt/mixed breed Build
They are not OEM pistons. They are aftermarket higher compression (brand unknown currently). Most common CR on aftermarket is 10.25/1. I have this set at home and can look at the markings, later tonight.
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.
Last edit: 09 May 2024 11:09 by Mikaw.
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09 May 2024 14:09 #898804
by zed1015
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
Replied by zed1015 on topic 73 Z1 mutt/mixed breed Build
Those pistons look like 10.25 -1 Wisecos but the Cook6 code may mean they are Cosworth.
As for the engine size, you can go as big as you like , they are self balancing as long as the crank is true..
As for the engine size, you can go as big as you like , they are self balancing as long as the crank is true..
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-
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