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Drilling jets bigger?
- polkat
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Okay, but this begs the question: What drill sizes equal what number (size) jets? Is there a listing somewhere showing jet numbers and the actual size of the holes?
Thanks!
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- loudhvx
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en.wikipedia.org/wiki/Drill_and_tap_size_chart
You can probably just order jets for those carbs.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- Joe Fabulous
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2004 Harley Davidson Softail
1981 Z1000 Chop
1982 KZ1100 A2
XS 650 Plunger Chop (in bits)
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- polkat
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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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- keith1
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dont let OMR hear ya say that.....:laugh:
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- polkat
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The bike is a 1982 KZ750H3 four. It is bone stock, although I am doing a few bobber mods. I want to go to pods as I want the space that the airbox uses for something else, and because frankly, I like the pod look. I will also drill the stock mufflers with 6-1/2" holes around the main outlets. That is all the mods the engine will receive.
I've drilled lots of auto carb jets without problems and have lots of drill sizes. I figure why bother to go through the hassel of ordering jets when I can easily open up what I have. I just don't know what size to open them up to.
What would be a good ballpark pilot/main jet size for this (or leave the pilots alone as mentioned?)?
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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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- loudhvx
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- KZr Legend
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www.z1enterprises.com/detail.aspx?ID=4038
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- otakar
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110 is stock? Okay, does anyone know the actual diameter of 110 jets?
The bike is a 1982 KZ750H3 four. It is bone stock, although I am doing a few bobber mods. I want to go to pods as I want the space that the airbox uses for something else, and because frankly, I like the pod look. I will also drill the stock mufflers with 6-1/2" holes around the main outlets. That is all the mods the engine will receive.
I've drilled lots of auto carb jets without problems and have lots of drill sizes. I figure why bother to go through the hassel of ordering jets when I can easily open up what I have. I just don't know what size to open them up to.
What would be a good ballpark pilot/main jet size for this (or leave the pilots alone as mentioned?)?
They are not measured in size. They are measured in flow rate. size 100 = 100cc/min. That is on the Mikunis. Iam not kidding when I say that no one knows how the Kaihins are numbered. It is not just the size of the hole because three or four sizes might have the same hole but the length of the hole is different and the taper on each side is different. That is how the jets are fine tuned. On the average the difference between sizes is approximately .001" To give you a perspective, a #58 (.042") bit would be a 110 jet but the length of the hole now is the other variable, and that is if you ignore the tapers at each end.
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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Z1 sells the Dynojet kit. It's expensive, but you pay for the research. It includes 4 adjustable needles for easier tuning.
www.z1enterprises.com/detail.aspx?ID=4038
If this guy wants to drill jets, he dose not want to spend the $8 on the four jets. How do you expect him to spend $100 on a Dynojet kit. :ohmy:
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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- keith1
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polkat wrote:
110 is stock? Okay, does anyone know the actual diameter of 110 jets?
The bike is a 1982 KZ750H3 four. It is bone stock, although I am doing a few bobber mods. I want to go to pods as I want the space that the airbox uses for something else, and because frankly, I like the pod look. I will also drill the stock mufflers with 6-1/2" holes around the main outlets. That is all the mods the engine will receive.
I've drilled lots of auto carb jets without problems and have lots of drill sizes. I figure why bother to go through the hassel of ordering jets when I can easily open up what I have. I just don't know what size to open them up to.
What would be a good ballpark pilot/main jet size for this (or leave the pilots alone as mentioned?)?
They are not measured in size. They are measured in flow rate. size 100 = 100cc/min. That is on the Mikunis. Iam not kidding when I say that no one knows how the Kaihins are numbered. It is not just the size of the hole because three or four sizes might have the same hole but the length of the hole is different and the taper on each side is different. That is how the jets are fine tuned. On the average the difference between sizes is approximately .001" To give you a perspective, a #58 (.042") bit would be a 110 jet but the length of the hole now is the other variable, and that is if you ignore the tapers at each end.
knowing this, it escapes me how someone can do a bike build and try to cheese out at every corner....no offense,
but ya got to cut loose with some cash if you are going to be successfull....if the cash isnt there, wait till it is.....
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