Selecting a jet needle

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27 Jul 2017 15:07 #767844 by kyan44
Selecting a jet needle was created by kyan44
Hello guys! My carbs are running lean on 1/4 to 3/4 throttle. I have a:
jet needle: #6F5 on #4.
How do I know which needle to get to make the carbs run richer.? Any suggestions?

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27 Jul 2017 17:56 #767851 by Nebr_Rex
Replied by Nebr_Rex on topic Selecting a jet needle
Download the Sudco catalog.
2002 ZRX1200R
81 GPz1100
79 KZ1000st daily ride
79 KZ1000mk2 prodject
78 KZ650sr
78 KZ650b
81 KZ750e
80 KZ750ltd
77 KZ400/440 cafe project
76 KZ400/440 Fuel Injected

www.dotheton.com/forum/index.php?topic=39120.0


.

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27 Jul 2017 18:32 #767855 by KZB2 650
Replied by KZB2 650 on topic Selecting a jet needle
Maybe save the money and time and try the 5th clip..... I went from the 4th to the 5th groove on my 24s before I went with my 29s and it seemed to go good.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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  • SWest
  • Offline
  • Sustaining Member
  • 10 22 2014
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27 Jul 2017 21:26 - 27 Jul 2017 21:27 #767859 by SWest
Replied by SWest on topic Selecting a jet needle
The needles are for fine adjustments. They run best in the center positions. If the next step up on the mains is too rich, you can set the needles down to lean it out in the mid range.
BTW, you have to sync the carbs every time you adjust the needles.
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
Last edit: 27 Jul 2017 21:27 by SWest.

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  • CoreyClough
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  • User
  • GPz550 Addiction
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28 Jul 2017 04:57 #767863 by CoreyClough
Replied by CoreyClough on topic Selecting a jet needle
What carbs are these?
'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp

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28 Jul 2017 07:01 #767868 by KZB2 650
Replied by KZB2 650 on topic Selecting a jet needle
Check out Jets R us...... they show a 6F4 so I'm "guessing" this is the next step richer but would he start off on the 3rd slot?
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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  • SWest
  • Offline
  • Sustaining Member
  • 10 22 2014
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28 Jul 2017 07:24 #767870 by SWest
Replied by SWest on topic Selecting a jet needle
I'd ask them.
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
The following user(s) said Thank You: Buxvan

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28 Jul 2017 11:50 #767881 by kyan44
Replied by kyan44 on topic Selecting a jet needle
I have a pair of Mikuni VM30. When I open the throttle between 1/4 to 3/4 and I check the spark plugs, It is very lean. I have the clip on the 5th grove, it should make the needle rich. BUt I see no effect

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