kz550 frame with kz650 motor

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18 Jul 2015 01:38 #681462 by September
kz550 frame with kz650 motor was created by September
Hi guys. I have a kawasaki kz 550, want to fit kz650 motor in any thoughts on that? It's a bike I got from a friend who didn't have time to finish it. He already cut the frame on the left as it come down from the neck.
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  • Tyrell Corp
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20 Jul 2015 08:25 #681786 by Tyrell Corp
Replied by Tyrell Corp on topic kz550 frame with kz650 motor
The 650 motor won't fit without quite a lot of surgery. My GPz550 was quicker than my mate's 750 top end z650, so not sure where the big gains are.

I'd check your rear suspension swingarm, the early unitracks can rust badly and have been known to crack.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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27 Jul 2015 05:02 #682929 by September
Replied by September on topic kz550 frame with kz650 motor
Ok. Thank you for the info

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27 Jul 2015 07:34 #682956 by loudhvx
Replied by loudhvx on topic kz550 frame with kz650 motor

Tyrell Corp wrote: The 650 motor won't fit without quite a lot of surgery. My GPz550 was quicker than my mate's 750 top end z650, so not sure where the big gains are.

I'd check your rear suspension swingarm, the early unitracks can rust badly and have been known to crack.


Same here. Maybe my buddies standard 750 was not tuned properly, but my gpz 550 could certainly keep up, if not pass him.

+1 on checking the 82-83 unitrack rear suspension for cracks.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
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