GpZ750 into a KZ650

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28 Oct 2006 11:05 #88033 by medic24
GpZ750 into a KZ650 was created by medic24
Has anyone put a GpZ750 engine into a KZ650? Any particular problems? How was the end result?
Thanks
Dave

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28 Oct 2006 11:08 #88034 by wireman
Replied by wireman on topic GpZ750 into a KZ650
i think jimmybon did that on the bike of month;)

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28 Oct 2006 12:37 #88050 by steell
Replied by steell on topic GpZ750 into a KZ650
79 KZ650SR in my garage with a 83 GPz750 motor in it right now :)

You will either have to switch the rear sprocket to a 630 or have a custom front sprocket made if you use a 83-85 GPz750 motor though, the 83-85 GPz750 uses an offset front sprocket.

There are other things you need to do also.
KD9JUR

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28 Oct 2006 12:49 #88054 by medic24
Replied by medic24 on topic GpZ750 into a KZ650
Thanks steell, I'm lookin at an 80 engine.

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28 Oct 2006 13:11 #88063 by steell
Replied by steell on topic GpZ750 into a KZ650
medic24 wrote:

Thanks steell, I'm lookin at an 80 engine.


80 GPz750 motor? I think 82 was the first year. A 1980 KZ750 four motor would be a little easier to put in a 650 though.
KD9JUR

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28 Oct 2006 15:47 #88096 by medic24
Replied by medic24 on topic GpZ750 into a KZ650
DOH.... yep, it's an 82. Any particular fit problems? Different engine mounts, etc?
Thanks

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28 Oct 2006 17:32 #88119 by steell
Replied by steell on topic GpZ750 into a KZ650
Just a matter of spacers and adapting the charging system and electronic ignition, no offset sprocket required so it should be pretty easy.
KD9JUR

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29 Oct 2006 05:19 #88238 by medic24
Replied by medic24 on topic GpZ750 into a KZ650
Adapt... or just completely replace?
Thanks

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29 Oct 2006 06:33 #88247 by steell
Replied by steell on topic GpZ750 into a KZ650
The 650 stator can be used on the 750 motor, then it's just a plug in operation. I'm not sure if the 750 reg/rec will plug into the 650 harness, we used a 83 GPz750 motor and it may be different than the KZ750 reg/rec.


The 750 igniter can be mounted on the 650 fairly easily, that way you have a reliable electronic ignition for low cost.
KD9JUR

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29 Oct 2006 07:37 #88262 by medic24
Replied by medic24 on topic GpZ750 into a KZ650
Thanks for the info, now we'll see what this winter brings

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