KZ550 with a CB750 Engine?

  • PorkChop Express
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08 Jun 2012 13:24 #527651 by PorkChop Express
KZ550 with a CB750 Engine? was created by PorkChop Express
So I've got a 1980 KZ550 with a frozen engine, and a bead on a cheap, working 1981 CB750 engine. Has anyone heard of a successful engine transplant of this caliber? Would you expect a lot of mounting issues?

Please help.

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  • DoubleDub
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08 Jun 2012 13:29 #527654 by DoubleDub
Replied by DoubleDub on topic KZ550 with a CB750 Engine?

PorkChop Express wrote: So I've got a 1980 KZ550 with a frozen engine, and a bead on a cheap, working 1981 CB750 engine. Has anyone heard of a successful engine transplant of this caliber? Would you expect a lot of mounting issues?

Please help.


It's a whole new mounting system in a new frame. Expect to have to do everything custom.

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  • testarossa
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08 Jun 2012 15:14 #527663 by testarossa
Replied by testarossa on topic KZ550 with a CB750 Engine?

DoubleDub wrote:

PorkChop Express wrote: So I've got a 1980 KZ550 with a frozen engine, and a bead on a cheap, working 1981 CB750 engine. Has anyone heard of a successful engine transplant of this caliber? Would you expect a lot of mounting issues?

Please help.


It's a whole new mounting system in a new frame. Expect to have to do everything custom.


One of the main problems will be a packaging issue. Those twin cam Honda 750 cylinders tilt forward quite a bit compared to a KZ550. The geometry of the frame will be a challenge. Not to mention that the Honda motor is quite large in almost every direction. The motor in my 82 CB750F is larger in every way than my 78 KZ1000 motor.
1978 KZ1000 A2 Click--->Build Thread
2004 ZX-10R
2007 Harley Sportster 1200
2020 Harley Street Glide Special
Angola, IN

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09 Jun 2012 02:01 #527778 by elfmagic17
Replied by elfmagic17 on topic KZ550 with a CB750 Engine?

testarossa wrote:

DoubleDub wrote:

PorkChop Express wrote: So I've got a 1980 KZ550 with a frozen engine, and a bead on a cheap, working 1981 CB750 engine. Has anyone heard of a successful engine transplant of this caliber? Would you expect a lot of mounting issues?

Please help.


It's a whole new mounting system in a new frame. Expect to have to do everything custom.


One of the main problems will be a packaging issue. Those twin cam Honda 750 cylinders tilt forward quite a bit compared to a KZ550. The geometry of the frame will be a challenge. Not to mention that the Honda motor is quite large in almost every direction. The motor in my 82 CB750F is larger in every way than my 78 KZ1000 motor.


+1 The cb750 is comparable in size to a kz1000 vs a kz550/650 small block to big block.cb550 is their biggest small block.
Kenny Hicks
74 Honda CB550
75 Honda CB360 (runs and rides good but not a show bike)
77 KZ650B1 (Runs Great, but needs painted and a little work.)

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09 Jun 2012 20:09 #527858 by baldy110
Replied by baldy110 on topic KZ550 with a CB750 Engine?
If you are on a tight budget you do not want to go down this road.

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10 Jun 2012 00:00 #527891 by floivanus
Replied by floivanus on topic KZ550 with a CB750 Engine?
seat of the pants wise, and from experience with my brother having a cb750... stick with the kz550 motor.
my bikes; 80kz1000(project), 77 gl1000, 74 h2 (project)
Past; 78 kz1000, 83 kz550
Andrew

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