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What Drill size Makes 140 Jets?
- jeffasaki
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78 Z1R
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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
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80 KZ-1300
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- TeK9iNe
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Dynajet, Mikunki, and Keihin jet numbers all mean different things too...
If you want 140's you have to buy them, or else drill and chance it.
GL.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- jeffasaki
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Im gonna try and shape the jet like a small velocity stack.And try some other shape profiles.Just wanna know the diameter of a 140 jet.Seems to be the optimum size for a liter size Kawi.Im just throwing around some ideas cause its pouring rain here and dont wanna ride in it.
Thanks in advance Jeff
?
78 Z1R
78 KZ1000
76 KH500 gone
71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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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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- jeffasaki
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78 Z1R
78 KZ1000
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71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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- testarossa
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1978 KZ1000 A2 Click--->Build Thread
2004 ZX-10R
2007 Harley Sportster 1200
2020 Harley Street Glide Special
Angola, IN
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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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- jeffasaki
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78 Z1R
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71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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- jeffasaki
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78 Z1R
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71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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- testarossa
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Doing the drilling on a lathe.Playing with shape profiles with a tiny little file and my bare hands.Thanks for the call on oversize.I knew that.Every drillbit cuts a bigger hole then its indicated size.Why is that?Maybe some thing happens with tool deflection during the cutting?
Lots of factors play into it. First are the cutting angles on the drill need to be exactly the same for the drill to remain on center and cut to size. Next the relief angle on the cutting edges needs to be the exact same. Also the lengths of the two cutting edges need to be the same. Also since you are using a lathe, you need to make sure that your tailstock is exactly on the centerline of the part in the chuck. Finally you need to make sure that the axis of the drill is aligned axially with the centerline of the drilled hole. Of course none of these factors will ever be perfect, so you come out a little oversize. Mostly you will find that your hole is slightly bell mouthed.
Btw you can experiment all you want, but it is very unlikley that you will be able to repeat your profile even one time by doing it by hand with a file. This would be fine on a single carb bike, but will lead to mucho headaches since you are trying to get four carbs to do the exact same thing.
I almost forgot, you are right about the tool deflection. If you don't get the surface footage (rpm) and feed rate (the rate that you advance the drill into the part) right, then you can deflect the tool. It is more critical on the smaller drills. You can haul ass with a 3" inserted drill, but don't try it with a #54. Recomended surface footage for brass is 200 sfpm with a high speed steel drill. To achieve 200 sfpm with a #54 drill, you would need 13,800 rpm. Recomended feed rate is 0.001"/revolution, so 28 in/min. But if you have drilled with the lathe, then you can feel when it is cutting well.
I'm not trying to bust your balls, I just do this for a living and I want you to know what you are getting yourself into. At the very least, in order to learn anything from your experiment, then you need 4 jets that are exactly the same. Otherwise, you are dealing with unending tuning issues. Even if you get four exact same jets then you need to make dyno pulls to verify your results. I think that Otakar is right here. You can't beat Z1E's price on jets. I'm a machinist who runs the machine that these jets are made on, and it isn't worth my time to make my own jets.
1978 KZ1000 A2 Click--->Build Thread
2004 ZX-10R
2007 Harley Sportster 1200
2020 Harley Street Glide Special
Angola, IN
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- jeffasaki
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PS I get drill bits free at the shop I used to work at and have access to a good mill,lathe and a lapping table.
I'll let you all know what conculsions I come to
78 Z1R
78 KZ1000
76 KH500 gone
71 HS1B 90
81 GS 1100 gone
80 PE400
02 KLR
Ontario Canada
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