Fuel tap for 1982 gpz750 r1 - Kawasaki Motorcycle Forums
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post #1 of 24 (permalink) Old 04-16-2016, 04:07 PM Thread Starter
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Fuel tap for 1982 gpz750 r1

Do you think this is the original fuel tap ?
I only ask as this bike has never been complete and i am in the final
stages of the project.

what think ?

i ask as the carbs have 2 vacuum pipes and
2 breather pipes and a single petrol pipe.
Petrol and breathers no issue but the fuel
tap only has a single vacuum nozzle.

where does the other vacuum pipe go ?

(No pictures as tank on but can do tomorrow)
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1982 GPZ 750 R1 Owner
1980 GS 550E
1977 RD250
1980 GSX 250
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post #2 of 24 (permalink) Old 04-16-2016, 06:34 PM
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That looks stock to me. Usually, each carb has a vacuum port. on CV carbs the ports are
usually high up on the carb body on the engine side of the carbs. In the USA two would be
for the Kawasaki clean air system (carbs #1 & #4), one would be capped (carb #3)
and one for the petcock (carb #2). Without the Kaw CAS, 3 vacuum ports would be capped.
Use good automotive rubber vacuum caps.




....

1981 KZ650-CSR. Competition, Sports & Road.

Last edited by martin-csr; 04-16-2016 at 06:39 PM.
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post #3 of 24 (permalink) Old 04-17-2016, 10:55 AM Thread Starter
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ok thanks - so i can attach one to the tank.
I have a question re when the tank is off with petrol in.

q) Putting petrol in the tank prime works as you would expect - perfect - pours out.
Reserve and On however when the tank is off drip out petrol from the fuel nozzle substantially.
No where near as fast as prime but it is not good at all.
You would need to very quickly attach the pipes or be drenched in petrol when putting it on
with a tank full.

Am I right in thinking this is not right ?
Even putting a blanking plug on the vacuum nozzle when tank is off does not stop the
substantial dripping on res or on.

What is the score with Kawasaki tanks ?
I have put new seals all round and the tap does not leak at all.
Petrol only comes out of the fuel nozzle when off ?

I new these small issues would stop me on this bike.
Why cant the damned taps just work ? really P$%^es me off

1982 GPZ 750 R1 Owner
1980 GS 550E
1977 RD250
1980 GSX 250
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post #4 of 24 (permalink) Old 04-17-2016, 02:00 PM
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When the engine is not running or the tank is removed from the bike,
ON & RES act as off & should stop the flow of fuel -->> no fuel flow.

Typical problems: defective vacuum diaphragm, diaphragm o-ring defective or not seating properly, mating surfaces pitted or damaged, worn or weak diaphragm spring.

PRI -->> fuel should flow freely -->> engine stopped or engine running, or tank removed from bike.
....

1981 KZ650-CSR. Competition, Sports & Road.

Last edited by martin-csr; 04-17-2016 at 02:02 PM.
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post #5 of 24 (permalink) Old 04-17-2016, 02:23 PM Thread Starter
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Cheers - ebayed another and will clean up the old one to see if i can ....
think o ring not seating correctly. poss spring old too

1982 GPZ 750 R1 Owner
1980 GS 550E
1977 RD250
1980 GSX 250
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post #6 of 24 (permalink) Old 04-17-2016, 02:39 PM
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Some guys fix it by stretching the spring.







....

1981 KZ650-CSR. Competition, Sports & Road.
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post #7 of 24 (permalink) Old 04-17-2016, 03:11 PM Thread Starter
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Cheers . my bike will be grateful when it gets going for these final niggling issues ....

1982 GPZ 750 R1 Owner
1980 GS 550E
1977 RD250
1980 GSX 250
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post #8 of 24 (permalink) Old 07-29-2019, 07:12 AM
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Here we are 3 years on and I'm deep in a ZRX1100, 1998, for a friend. The OE taps are just ****. They are fitted to so many models and other brands that I can't believe there has not been a mass revolution over these things. Fitted a kit, lasted 10 mins then leaked like a sieve. I had it on a paddock stand so it was level while trying to find misfire, no problem with carbs flooding. Put it on side stand, no centre, came in later and thought HMM petrol smell?. Nothing obvious and nothing on the floor. Following morning started up no problem and fuel was spraying from every possible opening or joint. During the night the entire contents of the tank were in the engine!!. How it never blew up when I pressed the button I'll never know. Drained it all and the tap was pissing out with the engine off. What a piece of crap these taps are, so the main question is:
Has anybody found a normal tap from another bike / model that can be fitted. Don't use the chinese replacement for 51023-1219 or 1260 because they don't fit!! The lever fouls the tank and the output is only 7mm whereas the OE is 10mm dia.
I've drawn the conclusion that when the bike leans on the side stand one or more float valves give way and it fills the engine. All in all, a bag of crap. I'll stick to Honda.

Last edited by dartmoordave; 07-29-2019 at 07:14 AM.
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post #9 of 24 (permalink) Old 07-29-2019, 07:16 AM
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Meant to say. Found a 10mm bore On/Off valve which I'm fitting below the OE tap to ensure a cutoff.
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post #10 of 24 (permalink) Old 07-29-2019, 10:43 AM
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What's the center-to-center bolt hole spacing?

When repairing a vacuum petcock or replacing it with same, I would only get Made in Japan as the diaphragm is a critical component.

I didn't see a 98 ZRX1100 listed in the diagrams at Partzilla. For the 99 ZRX, there doesn't seem to be a part number for a replacement diaphragm assy, so it seems that you have to replace the entire petcock. I would get either a genuine Kawasaki replacement petcock or switch to a manual fuel valve. A number of oem Yamaha fuel valves might work. Yamaha Raptor et al which have a 34mm bolt hole spacing (pretty sure) & there are several different types, some of which fit snug under the fuel tank & others protrude down more. Made in Japan & they are pretty cheap, in the $25 range.

I would not get a chinese petcock or fuel valve. made in china junk.
....

1981 KZ650-CSR. Competition, Sports & Road.
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