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28mm VM carbs 15 Dec 2019 15:30 #815400

  • Zilla
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Mikaw wrote: Have you checked the fuel petcock.... is it starving for fuel...[/quotes

I don’t think it is , I ain’t long had to take off the old petcock cause it hit the carb. I know have a pingale adapter with a 3/8 npt 90 elbow then a on/off in-line from autozone and a filter so I think it’s getting plenty. I have try and check it but by the time a stop and look the line is full, I put clear hose on it.

1986 KZ1000P
2005 Vmax
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28mm VM carbs 15 Dec 2019 15:38 #815401

  • Mikaw
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after it dies coming out of first gear what happens...
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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28mm VM carbs 15 Dec 2019 15:42 #815402

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Not a expert here but I don't think you can have the Airbleed nipple capped...
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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28mm VM carbs 15 Dec 2019 15:56 #815403

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Mikaw wrote: Not a expert here but I don't think you can have the Airbleed nipple capped

On the 34s that came on the bike those where capped but those are cv carbs , I ain’t sure bout these but figured it was the same. When I come out of first and roll the throttle to run it it don’t actually die but it don’t bog down and the front drop either like it was to rich. It don’t sputter and jump like it’s to lean, it’s just like it coasts till I slowly close the throttle and then it try’s to go again for a second. I haven’t drove it but a couple of times since I put the carbs on and I don’t go but bout a mile from the house cause it won’t GO like it should.

1986 KZ1000P
2005 Vmax

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28mm VM carbs 15 Dec 2019 16:02 #815404

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Try it with the air bleed nipples open.. Might be causing a pressure build up not allowing a good fuel flow... I have never seen them capped...
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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28mm VM carbs 15 Dec 2019 16:21 #815406

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Mikaw wrote: Try it with the air bleed nipples open.. Might be causing a pressure build up not allowing a good fuel flow... I have never seen them capped...


Can’t hurt to try, I’ll give it a go tomorrow and see what happens.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 15 Dec 2019 17:37 #815411

  • hardrockminer
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The needles control main jet fuel flow from about 1/8 to 3/4 throttle. Above 3/4 throttle the needles are almost all the way out and fuel flow through the main jet is controlled by the jet itself. Since you aren't able to get to high revs you shouldn't worry about changing main jets right now. Raising the needle positions will allow more fuel and lowering them will allow less. If you're fuel starved now then you won't want to lower the needles. The number on the needles should be scribed near the top. You need a magnifying glass (well, I do) to read the number.

What happens when you rev the engine up and feather the clutch to get going?
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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28mm VM carbs 15 Dec 2019 17:47 #815413

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hardrockminer wrote: The needles control main jet fuel flow from about 1/8 to 3/4 throttle. Above 3/4 throttle the needles are almost all the way out and fuel flow through the main jet is controlled by the jet itself. Since you aren't able to get to high revs you shouldn't worry about changing main jets right now. Raising the needle positions will allow more fuel and lowering them will allow less. If you're fuel starved now then you won't want to lower the needles. The number on the needles should be scribed near the top. You need a magnifying glass (well, I do) to read the number.

What happens when you rev the engine up and feather the clutch to get going?


It will pull off fine just a little hesitation but not enough to say is an issue, but I haven’t pushed it in 1st either so I don’t know what it will do if I did. When I rebuilt it the needles was on the 4th clip with 120 main I put it on the 3rd and tried 117.5 and then 115 main today.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 15 Dec 2019 18:38 #815414

  • TexasKZ
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Zilla wrote:

Mikaw wrote: Try it with the air bleed nipples open.. Might be causing a pressure build up not allowing a good fuel flow... I have never seen them capped...


Can’t hurt to try, I’ll give it a go tomorrow and see what happens.



The vacuum ports MUST be capped. The bowl vents MUST NOT be capped.

If the vacuum ports are not capped, the fuel mixture will be wicked lean. If the bowl vents are capped, the engine will be starved for fuel because very little fuel can go into the bowls unless air can get out..
1982 KZ1000 LTD parts donor
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28mm VM carbs 15 Dec 2019 18:52 #815416

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TexasKZ wrote:

Zilla wrote:

Mikaw wrote: Try it with the air bleed nipples open.. Might be causing a pressure build up not allowing a good fuel flow... I have never seen them capped...


Can’t hurt to try, I’ll give it a go tomorrow and see what happens.



The vacuum ports MUST be capped. The bowl vents MUST NOT be capped.

If the vacuum ports are not capped, the fuel mixture will be wicked lean. If the bowl vents are capped, the engine will be starved for fuel because very little fuel can go into the bowls unless air can get out..


Ok, do i need to put a hose on them angled down and open of course to keep the dirt and bugs out. I’ve been fight dirt dobbers for the past two years lol. They get everywhere, I got mesh over my Vmax intake to keep them out.
1986 KZ1000P
2005 Vmax

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28mm VM carbs 15 Dec 2019 18:59 #815418

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if your concerned about insects then try a short section of hose with some fine mesh screen over the end and zippy tied
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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28mm VM carbs 15 Dec 2019 19:04 #815419

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Mikaw wrote: if your concerned about insects then try a short section of hose with some fine mesh screen over the end and zippy tied


Good idea I believe I got some mesh left.
1986 KZ1000P
2005 Vmax

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