Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

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Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

20 Jan 2025 09:19
#908071
Can a 1977 Z1000 A1 cylinder head with 8mm stud bolts for exhaust be used on a 1974 - 1975 Z1 900 engine?
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1976 Kawasaki KZ900-A4, 1974 Kawasaki Z1A 900, 1987 Kawasaki GPX750R

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Re: Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

20 Jan 2025 09:44
#908074
Yes they can be swapped.  Obviously, you’ll want to use the cam caps that came with the 8mm head.  You probably should get the exhaust retaining collars for the 8mm studs but it’s not 100% necessary.

Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter
1979 z650 Resto-Mod
1983 Gpz750 Resto-Mod
2018 Z900RS
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Re: Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

20 Jan 2025 10:33
#908077
Great, thank you 
[img
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1976 Kawasaki KZ900-A4, 1974 Kawasaki Z1A 900, 1987 Kawasaki GPX750R

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Re: Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

21 Jan 2025 07:35
#908095
You may have to drill out the 900 exhaust collars, I know I had to do this when I put 8 mm studs on a 650 head as there is a 1/16" difference in diameter.
1978 KZ650B2 w 1197cc Z1 engine
1977 KZ650B1 w 750cc Spectre engine
1979 KZ650C3 w 831cc Hot Rod engine
1978 KZ650C2 w 762cc DFI project
1977 KZ650C1 stock restoration project
1978 KZ650B2 modified project
1978 KZ650B2 Injected Drag 831cc
1980 Z1 Custom Frame Drag 1327cc
1981 Z50R Honda tow bike

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Re: Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

21 Jan 2025 12:21
#908106
More regarding the exchange of heads.

1977 KZ650 B1
Pods and Denco header

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Re: Z1000 A1 cylinder head 8mm stud bolts vs Z1 900 cylinder head 6 mm stud bolt …

21 Jan 2025 15:54
#908109
The only external difference is the larger exhaust studs. If you want to be sneaky use these. 

6mm to 8mm stud
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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