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Carburetor problem

  • Danny Millhorn
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23 Jul 2019 19:59 #808056 by Danny Millhorn
Carburetor problem was created by Danny Millhorn
Rebuilt carburetors on 1975 z1900. Only runs with full choke. What's wrong?

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24 Jul 2019 02:28 - 24 Jul 2019 02:34 #808059 by Patton
Replied by Patton on topic Carburetor problem
I suspect that the pilot circuits are not yet perfectly clean.

Wear eye protection while spraying carb clearer because the spray always backfires. ALWAYS .

Pay extra careful attention toward cleaning the orifice into bottom of the car bore (number 6 on the following diagram).



Good Fortune! :)

1973 Z1
KZ900 LTD
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Last edit: 24 Jul 2019 02:34 by Patton.
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24 Jul 2019 02:48 - 25 Jul 2019 00:05 #808060 by Patton
Replied by Patton on topic Carburetor problem
The carbs at hand may have the pilot mixture screw instead of the "pilot air screw "as shown in the earlier diagram.



Both style carbs have an orifice into the carb bore.

Good Fortune! :)

1973 Z1
KZ900 LTD
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Last edit: 25 Jul 2019 00:05 by Patton.
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  • hardrockminer
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24 Jul 2019 05:28 #808066 by hardrockminer
Replied by hardrockminer on topic Carburetor problem
What do you mean when you say you rebuilt them? What did you change? Are these the original carbs? What serial number is the engine?

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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  • Danny Millhorn
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24 Jul 2019 15:19 #808084 by Danny Millhorn
Replied by Danny Millhorn on topic Carburetor problem
The bike has been off the road since '84. Installed carb kits in all 4 carbs, however once I got into it I realized there are part variances and just because the gaskets fit doesn't necessarily mean the jets etc., are right so it's possible I installed the wrong parts. I believe the carbs are original. As for the engine serial number, I will need to look .

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24 Jul 2019 15:48 #808086 by hardrockminer
Replied by hardrockminer on topic Carburetor problem
The reason I asked for the engine S/N is because they switched carbs mid year for 1974. Up to S/N 35,000 had the Z1 style carbs with different jetting than the rest of Z1A bikes, which used the same carbs as the Z1B.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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  • hardrockminer
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25 Jul 2019 05:33 #808096 by hardrockminer
Replied by hardrockminer on topic Carburetor problem
I think I made a mistake. I thought the bike was a '74 but I see now that it's a 75. Stock carbs would be VM28SS. Pilots would be 17.5 and mains would be 112.5. Air screws should be out 1 and 1/4 turns from lightly seated. Needles should be 5J9 with the clip in second position from the top. Jet needles are O8.

What parts are currently installed?

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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25 Jul 2019 05:55 #808097 by davido
Replied by davido on topic Carburetor problem

hardrockminer wrote: I think I made a mistake. I thought the bike was a '74 but I see now that it's a 75. Stock carbs would be VM28SS. Pilots would be 17.5 and mains would be 112.5. Air screws should be out 1 and 1/4 turns from lightly seated. Needles should be 5J9 with the clip in second position from the top. Jet needles are O8.

What parts are currently installed?


Wow! The joy of forums. There you have it. What more could you ask for!!

www.kzrider.com/forum/11-projects/594313-csr1000-project-build
CB550 (1978)
CB500/4 (1972)*
KZ1000CSR (1981)
XT 600E (1999)
TDM900 (2003)
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  • Danny Millhorn
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25 Jul 2019 20:40 #808143 by Danny Millhorn
Replied by Danny Millhorn on topic Carburetor problem
The engine s/n is:Z1E059149.
BTW should the engine S/N be the same as the title ID #? Mine are different.

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25 Jul 2019 23:31 #808151 by Patton
Replied by Patton on topic Carburetor problem

1973 Z1
KZ900 LTD

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  • slmjim+Z1BEBE
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26 Jul 2019 04:48 #808154 by slmjim+Z1BEBE
Replied by slmjim+Z1BEBE on topic Carburetor problem

Danny Millhorn wrote: The engine s/n is:Z1E059149.
BTW should the engine S/N be the same as the title ID #? Mine are different.


Title should have the frame VIN, starting with Z1F- if it's really a Z1 frame.

Good Ridin'
slmjim & Z1BEBE

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A Rider looks at your odometer and tags.

1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
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2009 ST1300A

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  • hardrockminer
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26 Jul 2019 05:35 #808155 by hardrockminer
Replied by hardrockminer on topic Carburetor problem
That S/N is definitely a '75. If your intake and exhaust are stock then the parts I described are correct for the carbs.

Did you rebuild them? If so, what did you do?

When I rebuild them I take everything apart and wash parts in an ultrasonic bath. Then blow compressed air through all the holes, particularly the three small orifices on the intake side to ensure they are clear. I use all new jets and needles and throw out the old ones. Use new gaskets for the bowls and tops. I like the Keyster kits sold by Z1 Enterprises.

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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