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Flat spot need help (new info) and pics
- Buda
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Thanks for any help
Tom
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
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- bountyhunter
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1979 KZ-750 Twin
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- Patton
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Im running BS34s and they run good but for a flat spot from around 6000 to 7000 rpm, where do I start? I am trying to learn to work on carbs but dont know poo at this point.
Thanks for any help
Tom
On the large fours, am thinking 6000~7000 rpm is still within mid-range carb function, influenced by jet needle clip position, slide position and cutaway design.
Plug reading may help determine whether fuel mixture is an issue in mid-range. Flat spot might result from either too rich or too lean clip position. Are different clip positions available? If only a single clip position, has it been enrichened by a small washer added under the clip? If so, perhaps the mid-range is too rich.
At 6000~7000 rpm, I would in this instance suspect the jet needle clip position as cause of the flat spot, and not the main jet size.
I don't know whether different size needle jets are available for this carb. Sometimes the corresponding Canadian model carb has a different jet needle (perhaps smaller taper) and/or a different needle jet (perhaps larger orifice) and/or several different clip positions.
The U.S. model carbs were sometimes less subject to "tuning" due to restrictive EPA regulations.
Good Luck!
1973 Z1
KZ900 LTD
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- Buda
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As far as checking the plugs, should I cut the engine off in that rpm range and look at them then? Sounds rite to me.
Thanks
Tom
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
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- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Buda
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K&N pods
J cams
Vance&Hines pipe
dyna coils and wires
WG rebuilt and jetted my carbs
From the carb guy
I believe we reused the OEM jet needles, used #140 main jets and #40 pilot
jets.
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- otakar
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- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Buda
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I paid him to rebuild and jet the carbs for pods and the pipe. As far as what helps for the flat spot I just throttle through it, its not like it dosnt pull at all it just really comes on at 7000.
1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- otakar
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First I not trying to bash WG.
I paid him to rebuild and jet the carbs for pods and the pipe. As far as what helps for the flat spot I just throttle through it, its not like it dosnt pull at all it just really comes on at 7000.
OK than this means that the main jet is most likely good. It is a needle or slide problem. Now you have to find out what you have.
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- Buda
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1982 KZ 1170 LTD
10.25 to 1 comp
K&N pods
GPZ cams
Vance&Hines pipe with comp baffle
dyna coils and wires
97 Valkyrie Standard
Please Log in or Create an account to join the conversation.