Idle and exhaust pops
- Fox
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Idle and exhaust pops
22 Sep 2017 18:41
Hello,
I have a kz1000 ltd b2 1978.
Since i have it i never get a correct idle.
Each carb came with a main jet at 110 and a pilot jet at 20.
Wrong idle but no pops or really minimals.
I buy 4 new carb kits and new manifolds because the old ones was totaly dead.
I finally have a correct idle with a main jet at 105 and a pilot jet at 15.
But i have a lot of pops...
Today i try a main jet at 110 and a pilot jet at 17.
It's not good...
I have stock air box. 1 mix screw on the bottom of each carb at 1 + 1/8 turns out.
For the moment I think i have to go back with a main jet at 105 and a pilot jet at 15 :
But why all those pops ?????
Why this carbs came with 110 main jet and 20 pilot jet?
The parts look oem kawasaki parts...
Cheers
Fox
I have a kz1000 ltd b2 1978.
Since i have it i never get a correct idle.
Each carb came with a main jet at 110 and a pilot jet at 20.
Wrong idle but no pops or really minimals.
I buy 4 new carb kits and new manifolds because the old ones was totaly dead.
I finally have a correct idle with a main jet at 105 and a pilot jet at 15.
But i have a lot of pops...
Today i try a main jet at 110 and a pilot jet at 17.
It's not good...
I have stock air box. 1 mix screw on the bottom of each carb at 1 + 1/8 turns out.
For the moment I think i have to go back with a main jet at 105 and a pilot jet at 15 :
But why all those pops ?????
Why this carbs came with 110 main jet and 20 pilot jet?
The parts look oem kawasaki parts...
Cheers
Fox
1978 KZ1000-B2 LTD
1977 kz1000-B1 LTD
1977 kz1000-B1 LTD
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- SWest
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Re: Idle and exhaust pops
22 Sep 2017 18:46
Carbs synced?
Steve
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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- 650ed
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Re: Idle and exhaust pops
22 Sep 2017 19:11
If it was my bike and since it has the stock air box I would put the stock jet needle (5CN7); needle jet (AO-3); and pilot jet (A15) in it and see how it runs. I figure the bike ran well when it was new and had those parts so it should run well with them now (see link below). Ed
www.powersportswarehouse.com/p/Kawasaki#...00-B2-1978/070061C-7
www.powersportswarehouse.com/p/Kawasaki#...00-B2-1978/070061C-7
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Re: Idle and exhaust pops
22 Sep 2017 19:20 - 22 Sep 2017 19:25
- Not actually syncro.
- the new main jets i have is at 105.
Specs are at 102.5
Do you think it's important ?
Regards
- the new main jets i have is at 105.
Specs are at 102.5
Do you think it's important ?
Regards
1978 KZ1000-B2 LTD
1977 kz1000-B1 LTD
1977 kz1000-B1 LTD
Last edit: 22 Sep 2017 19:25 by Fox.
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Re: Idle and exhaust pops
22 Sep 2017 19:29
At least bench sync them. Valves adjusted?
Steve
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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Re: Idle and exhaust pops
22 Sep 2017 19:40
@Steve
Do you think scync can reduce exhauts pops?
Pops are at the end of the exhausts
(no backfire or pops from the air box)
Do you think scync can reduce exhauts pops?
Pops are at the end of the exhausts
(no backfire or pops from the air box)
1978 KZ1000-B2 LTD
1977 kz1000-B1 LTD
1977 kz1000-B1 LTD
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Re: Idle and exhaust pops
22 Sep 2017 20:22Fox wrote: - Not actually syncro.
- the new main jets i have is at 105.
Specs are at 102.5
Do you think it's important ?
Regards
Yes. Since you are trying to isolate the problem causing the pops I believe it would be best to eliminate as many variables as possible. Putting the jetting back to stock will eliminate the possibility that the non-stock jetting is causing the problem. In fact, it may eliminate the problem, but even if it doesn't you will know for sure the jetting is not causing the problem so you won't spend additional time and resources trying different jetting combinations to fix the problem. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Re: Idle and exhaust pops
22 Sep 2017 20:32Fox wrote: @Steve
Do you think scync can reduce exhauts pops?
Pops are at the end of the exhausts
(no backfire or pops from the air box)
If they that far out it will pop. Valves adjusted?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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- Fox
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Re: Idle and exhaust pops
22 Sep 2017 22:10
Yes valves are under specs
1978 KZ1000-B2 LTD
1977 kz1000-B1 LTD
1977 kz1000-B1 LTD
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- kevski
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Re: Idle and exhaust pops
23 Sep 2017 12:34 - 23 Sep 2017 12:45
This is my B2, there are no smog attachments and a non standard exhaust i also have a stock air box, the jets had been played with but i now have a 107.5 main, a 20 pilot, needle 5cn7 on groove 3, pilot screws 1 & 1/4 turns out, runs perfectly, when i got it it had 117.5 main, 25 pilot, needle 5cn7 on groove 4, and it ran like a pig, if you aftermarket exhaust with some baffling, go to the same as mine you wont be far out 102.5 and 105 jets run too weak,.
Last edit: 23 Sep 2017 12:45 by kevski.
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- Fox
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Re: Idle and exhaust pops
23 Sep 2017 15:06
Hello,
beautifull bike, congrats for the job done.
So clean ! would like to see inside
Is your exhaust 4 in 1 ?
Best
Fox
beautifull bike, congrats for the job done.
So clean ! would like to see inside
Is your exhaust 4 in 1 ?
Best
Fox
1978 KZ1000-B2 LTD
1977 kz1000-B1 LTD
1977 kz1000-B1 LTD
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Re: Idle and exhaust pops
23 Sep 2017 22:47
Yes, stainless 4into1 with a harris road baffle.
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