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Kz750-Gpz750 top end interchangeable?
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Kz750-Gpz750 top end interchangeable? 14 Feb 2019 02:46 #798623

  • Pipes66
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As the subject asks,will a 83 ish gpz top end(pistons,barrels,head) go on a kz bottom end?
I’d love to swap the whole engine but the kz is shaft drive.
1983 kz750 F1 Ltd Shaft US model

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Kz750-Gpz750 top end interchangeable? 14 Feb 2019 04:37 #798625

  • Nessism
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There are a few differences that I know of. One, the early engines use a mechanical tach drive and the later bikes eliminated that and went to an electronic tach triggers off a coil signal or something like that. The shape of the fins on the later engines is different, and there was a change to the combustion chamber shape and pistons. If you have the entire top end to switch everything should swap over, but again, you will loose your tach.

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Kz750-Gpz750 top end interchangeable? 14 Feb 2019 05:45 #798629

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I think my tach is electronic,there’s no drive off the cam,if that’s where it would be.
I was more concerned with bolt pattern and cam chain length/line up.
1983 kz750 F1 Ltd Shaft US model

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Kz750-Gpz750 top end interchangeable? 14 Feb 2019 17:12 #798676

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Just noticed your signature line which states you have a shaft drive bike. Pretty sure everything will bolt up. When in doubt you can always check part numbers and do a comparison.

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Kz750-Gpz750 top end interchangeable? 14 Feb 2019 17:19 #798678

  • baldy110
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It'll bolt right on.

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Kz750-Gpz750 top end interchangeable? 15 Feb 2019 05:31 #798698

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Wow,have I slipped into another dimension where things I want to work,work?:woohoo: :woohoo:
Is the gpz cam timing method the same as the kz?
1983 kz750 F1 Ltd Shaft US model

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Kz750-Gpz750 top end interchangeable? 15 Feb 2019 08:28 #798717

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Yes, just be aware if your using the GPZ cams your gonna lose some low end torque. The hotter cams moves the power up the RPM range.

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Kz750-Gpz750 top end interchangeable? 15 Feb 2019 14:28 #798734

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Be sure to pull the cam chain tensioner wedge spring out before installing the valve cover, otherwise the chain will be over tensioner when the cover is installed.

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Kz750-Gpz750 top end interchangeable? 16 Feb 2019 04:08 #798755

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I’ll use the kz cams then,thank you.
I’m using a manual cct at the moment,I assume you’re talking about the standard gpz one,I may use the standard one.
1983 kz750 F1 Ltd Shaft US model

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Kz750-Gpz750 top end interchangeable? 16 Feb 2019 09:32 #798773

  • zukdave
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You'll see no gain without the GPz cams.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63" wheel base.

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Kz750-Gpz750 top end interchangeable? 16 Feb 2019 13:24 #798782

  • Nessism
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[quote="Pipes66" post=798755}
I’m using a manual cct at the moment,I assume you’re talking about the standard gpz one,I may use the standard one.[/quote]

I didn't explain very well. Basically, there is a rub block in the valve cover which presses down on the chain. That's why it's important to do the chain tensioning after the cover is on, not before.

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Kz750-Gpz750 top end interchangeable? 16 Feb 2019 13:59 #798783

  • Scirocco
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I am total with Nessism statement.
I have seen a lot of cracked valve covers and broken cam chains after a cam install or valve clearance adjustment.
An automatic cam chain adjuster can be a PITA.



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