ZX900 carbs on a gpz750

  • Meat-head
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ZX900 carbs on a gpz750

05 Apr 2019 18:08
#801613
Has anyone ever put the carb assembly from a water cooled ZX900 on an air cooled gpz750?
I bought a basket case project, needing carbs. And bought some part before doing any research.
I know, you don’t have to say it...
Anyway, just wondering if there is a bleak glimmer of hope in this.
I want to put a big bore kit in the bike and thought carbs set up for a bigger engine would be the way to go.
Thanks for reading.

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  • baldy110
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Re: ZX900 carbs on a gpz750

05 Apr 2019 18:50
#801615
The carb spacing is different on the water cooled bikes so the ZX carbs will not bolt on without some creative solution.

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Re: ZX900 carbs on a gpz750

12 Apr 2019 16:38
#802003
So, I found another set at a local wrecker. They fit perfectly but don’t utilize the push/pull throttle. Is this an issue?
Not sure of what model the carbs are from...
Sorry got the newbie posts...

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Re: ZX900 carbs on a gpz750

12 Apr 2019 17:51
#802008
Those look like BS34 carbs, the same type of carb the 82 GPZ750 came with. That bike didn't have a push / pull setup but just a pull cable.
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Re: ZX900 carbs on a gpz750

12 Apr 2019 19:31
#802011
So is it fair to say they should work?
Also there is a fuel rail, it has two barbed connections. Would one be for the reserve line?

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Re: ZX900 carbs on a gpz750

13 Apr 2019 08:41
#802027
No reserve, each one is a fuel source for a pair of carbs.

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Re: ZX900 carbs on a gpz750

13 Apr 2019 16:10 - 13 Apr 2019 16:11
#802052
baldy110 wrote: No reserve, each one is a fuel source for a pair of carbs.

I believe for the BS34s on the GPzs (they were also used on the Yamaha XS bikes) there is only one large (5/16”) barbed fitting that is for the fuel supply. There will also be two smaller (less than 1/4”) barbed fittings for the vent lines.
1976 KZ900A4
1976 KZ900A4
1978 KZ1000A2
1983 ZX750 A1 aka GPz 750
1983 ZX750 A1
1973 CL350K4
1984 ZX1100 A2 aka GPz1100
1969 CT90
2006 Burgman 400
Last edit: 13 Apr 2019 16:11 by ayeckley. Reason: Typo

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  • zukdave
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Re: ZX900 carbs on a gpz750

14 Apr 2019 05:08 - 14 Apr 2019 05:09
#802081
If you are going to mod the motor with a big bore kit and other hot rod goodies I'd find a set of VM28's
and not mess with those cv carb's.
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.
Last edit: 14 Apr 2019 05:09 by zukdave.
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Re: ZX900 carbs on a gpz750

14 Apr 2019 12:48
#802113
So I can’t get it to fire unless I squirt gas right in the carb intake. There is new fuel in the tank, and in the float bowls.
Though there is currently no air cleaner. It will not even pop once. Any ideas on where to start? All the vac ports are plugged, the vents between the carbs are not.
i noticed the barrels in the carbs do not move with the throttle, does airflow through the carb actuate these?
Thanks.

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Re: ZX900 carbs on a gpz750

14 Apr 2019 15:08
#802120
Dd you clean and service those carbs, float level, check for proper jetting, checked diaphrams , needles ect.?

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Re: ZX900 carbs on a gpz750

14 Apr 2019 18:54
#802148
That’s my next step,
I was hoping it might run enough to do further troubleshooting, but that doesn’t appear to be the case.
I was hoping to get further with before I leave town for a month or so. The bike needs damn near everything component serviced. At least the electrical seems to be in order.
Anyway, I’ll regroup.
Thanks for all the input.

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Re: ZX900 carbs on a gpz750

15 Apr 2019 09:01
#802174
Yeah, that never works for me. I always have to service used carbs or I end up fighting tuning problems until I do.

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