- Posts: 67
- Thank you received: 1
Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
- kz650guy123
- Topic Author
- Offline
- User
Less
More
07 Sep 2023 09:59 - 07 Sep 2023 11:24 #889134
by kz650guy123
Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ? was created by kz650guy123
I need a screw with an o-ring I guess.
I have been trying for years to get the air screws on my 79 KZ650BE set right. These vm24 smog carbs had the air screws plugged with a cap.
The screw itself does not have an o-ring on it. Never did have an o-ring. There isn't even a groove for an o-ring.
I'm thinking that all the trouble I've had with this was air leaking past the threads. I would put a little grease on the threads to prevent binding.
Then I could almost get a good idle. But it didn't click with me that, that was the problem.
I put a glob of grease in the hole above the threads. Now seems to be running pretty well.
Does anyone know the part number for a replacement screw with o-ring.
If needed I will post a picture of what my screw looks like.
Thanks
I have been trying for years to get the air screws on my 79 KZ650BE set right. These vm24 smog carbs had the air screws plugged with a cap.
The screw itself does not have an o-ring on it. Never did have an o-ring. There isn't even a groove for an o-ring.
I'm thinking that all the trouble I've had with this was air leaking past the threads. I would put a little grease on the threads to prevent binding.
Then I could almost get a good idle. But it didn't click with me that, that was the problem.
I put a glob of grease in the hole above the threads. Now seems to be running pretty well.
Does anyone know the part number for a replacement screw with o-ring.
If needed I will post a picture of what my screw looks like.
Thanks
Last edit: 07 Sep 2023 11:24 by kz650guy123.
Please Log in or Create an account to join the conversation.
- ckahleer
- Offline
- User
Less
More
- Posts: 434
- Thank you received: 143
07 Sep 2023 10:25 #889136
by ckahleer
94 KE100
81 CM200t
82 KZ305
85 VF1100c
Replied by ckahleer on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Partzilla shows an o-ring p/n 16038-024
94 KE100
81 CM200t
82 KZ305
85 VF1100c
The following user(s) said Thank You: kz650guy123
Please Log in or Create an account to join the conversation.
- Warren3200gt
- Offline
- User
Less
More
- Posts: 1508
- Thank you received: 715
07 Sep 2023 10:38 - 07 Sep 2023 10:39 #889137
by Warren3200gt
Replied by Warren3200gt on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Plumbers ptfe tape on the male thread before screwing in will stop any air bleed in or out permanently.
Last edit: 07 Sep 2023 10:39 by Warren3200gt.
The following user(s) said Thank You: kz650guy123, Wookie58
Please Log in or Create an account to join the conversation.
- kz650guy123
- Topic Author
- Offline
- User
Less
More
- Posts: 67
- Thank you received: 1
07 Sep 2023 10:52 #889138
by kz650guy123
Replied by kz650guy123 on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Thanks ckahleer I'll look up that part number.
Warren the ptfe tape is an idea. But I would be afraid that would fall into the carb ?
Warren the ptfe tape is an idea. But I would be afraid that would fall into the carb ?
Please Log in or Create an account to join the conversation.
- kz650guy123
- Topic Author
- Offline
- User
Less
More
- Posts: 67
- Thank you received: 1
07 Sep 2023 10:58 - 08 Sep 2023 06:52 #889139
by kz650guy123
Replied by kz650guy123 on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Ckahleer thanks for the part #. But that is only a o-ring. As I stated in the post my screw doesn't even have a groove for an o-ring.
What I need is a replacement screw WITH an o-ring on it.
That's what I'm having trouble finding.
What I need is a replacement screw WITH an o-ring on it.
That's what I'm having trouble finding.
Last edit: 08 Sep 2023 06:52 by kz650guy123.
Please Log in or Create an account to join the conversation.
- Warren3200gt
- Offline
- User
Less
More
- Posts: 1508
- Thank you received: 715
07 Sep 2023 11:12 #889140
by Warren3200gt
Replied by Warren3200gt on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Warren the ptfe tape is an idea. But I would be afraid that would fall into the carb ?
No chance, there's a step from the thread to the taper.
The following user(s) said Thank You: kz650guy123
Please Log in or Create an account to join the conversation.
- ckahleer
- Offline
- User
Less
More
- Posts: 434
- Thank you received: 143
07 Sep 2023 11:47 #889142
by ckahleer
94 KE100
81 CM200t
82 KZ305
85 VF1100c
Replied by ckahleer on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Are you sure there should be a grove. Any mixture screw I have worked with, the o-ring would slide on the smooth section of the screw as the screw was turned in and out.Ckahleer thanks for the part #. But that is only a o-ring. As I stated in the post my screw doesn't even have a groove for an o-ring.
What I need is for a replacement screw WITH an o-ring on it.
That's what I'm having trouble finding.
94 KE100
81 CM200t
82 KZ305
85 VF1100c
The following user(s) said Thank You: kz650guy123
Please Log in or Create an account to join the conversation.
- Nessism
- Offline
- Sustaining Member
Less
More
- Posts: 7515
- Thank you received: 2830
07 Sep 2023 11:56 - 07 Sep 2023 14:35 #889144
by Nessism
Replied by Nessism on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
If you look at the parts fishe, such on Partzilla, you will see that there are two different air screws listed. The standard type that takes an O-ring, and fits 650/900/1000 bikes with VM carbs, and a second PN, presumably without the O-ring groove, that's specific to the 650.
I don't know if the port in the carb is different between the two types of carbs, which take the different screws. If they are different, then you are stuck with the stock pilot air screws. If they are the same, then you should be able to source the type of screws that use O-rings. There are lots of them on eBay. It seems to me, though, that if a wrap of teflon tape solves the air leakage problem, the fix is a nobrainer. As long as the tape isn't loose, below the threaded area of the screw, it won't come loose and get sucked into the carb passage. Another option is to adjust the screw where you want it, then seal over the top of the screw with a soft sealer of some type.
I don't know if the port in the carb is different between the two types of carbs, which take the different screws. If they are different, then you are stuck with the stock pilot air screws. If they are the same, then you should be able to source the type of screws that use O-rings. There are lots of them on eBay. It seems to me, though, that if a wrap of teflon tape solves the air leakage problem, the fix is a nobrainer. As long as the tape isn't loose, below the threaded area of the screw, it won't come loose and get sucked into the carb passage. Another option is to adjust the screw where you want it, then seal over the top of the screw with a soft sealer of some type.
Last edit: 07 Sep 2023 14:35 by Nessism.
The following user(s) said Thank You: slayer61, sf4t7, kz650guy123
Please Log in or Create an account to join the conversation.
- kz650guy123
- Topic Author
- Offline
- User
Less
More
- Posts: 67
- Thank you received: 1
08 Sep 2023 07:55 - 08 Sep 2023 07:58 #889164
by kz650guy123
Replied by kz650guy123 on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Last edit: 08 Sep 2023 07:58 by kz650guy123.
Please Log in or Create an account to join the conversation.
- Wookie58
- Offline
- Moderator
Less
More
- Posts: 4104
- Thank you received: 2342
08 Sep 2023 08:01 #889165
by Wookie58
Replied by Wookie58 on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
I think Nessism's suggestion of RTV etc once the screws are set is probably preferable to grease and easy enough to remove
The following user(s) said Thank You: kz650guy123
Please Log in or Create an account to join the conversation.
- kz650guy123
- Topic Author
- Offline
- User
Less
More
- Posts: 67
- Thank you received: 1
08 Sep 2023 08:15 #889166
by kz650guy123
Replied by kz650guy123 on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Ok thanks Wookie. I think I'll leave the grease in there until I'm sure it's tuned the way I want it.
Then I'll probably use some hi temp rtv.
thanks all
Then I'll probably use some hi temp rtv.
thanks all
Please Log in or Create an account to join the conversation.
- martin_csr
- Offline
- User
Less
More
- Posts: 8068
- Thank you received: 1656
08 Sep 2023 08:26 - 08 Sep 2023 08:37 #889167
by martin_csr
Replied by martin_csr on topic Trying to figure out the air screw 79 KZ650BE ? Need an o-ring ?
Just an FYI. At Partzilla the diagrams for the 1980 KZ650F and 81 KZ650-CSR list an air adjusting screw w o-ring and a pilot adjusting screw without o-ring, and they fit into the same orifice as the 79 models. The part numbers are the same between the models and are the same as some of the earlier 650s to 1978, although only the 80-81 650s have the screws without o-rings. The 81 air adjusting screw w o-ring is for the Canadian models where EPA regs don't apply and the same is probably true for the 80 models.
Last edit: 08 Sep 2023 08:37 by martin_csr.
Please Log in or Create an account to join the conversation.