I know many people that use a jet drill kit to drill out thier jets. I was looking for the true hole size for a while. Here's the data:
(Width = true hole diameter)
Width
Keihin # -- DynoJets # -- Mikuni #
0.0350---- 92.5
92
86.3
0.0360---- 95
94
88.1
0.0370---- 97.5
96
90.0
0.0380---- 100
98
91.9
0.0390---- 102.5
100
93.8
0.0400---- 105
102
95.6
0.0410---- 107.5
104
97.5
0.0420---- 110
106
99.4
0.0430---- 112.5
108
101.3
0.0440---- 115
110
103.1
0.0450---- 117.5
112
105.0
0.0460---- 120
114
106.9
0.0470---- 122.5
116
108.8
0.0480---- 125
118
110.6
0.0490---- 127.5
120
112.5
0.0500---- 130
122
114.4
0.0510---- 132.5
124
116.3
0.0520---- 135
126
118.1
0.0530---- 137.5
128
120.0
0.0540---- 140
130
121.9
0.0550---- 142.5
132
123.8
0.0560---- 145
134
125.6
0.0570---- 147.5
136
127.5
0.0580---- 150
138
129.4
0.0590---- 152.5
140
131.3
0.0600---- 155
142
133.1
0.0610---- 157.5
144
135.0
0.0620---- 160
146
136.9
0.0630---- 162.5
148
138.8
0.0640---- 165
150
140.6
0.0650---- 167.5
152
142.5
0.0660---- 170
154
144.4
0.0670---- 172.5
156
146.3
0.0680---- 175
158
148.1
0.0690---- 177.5
160
150.0
0.0700---- 180
162
151.9
0.0710---- 182.5
164
153.8
0.0720---- 185
166
155.6
0.0730---- 187.5
168
157.5
0.0740---- 190
170
159.4
0.0750---- 192.5
172
161.3
0.0760---- 195
174
163.1
0.0770---- 197.5
176
165.0
0.0780---- 200
178
166.9
0.0790---- 202.5
180
168.8
0.0800---- 205
182
170.6
0.0810---- 207.5
184
172.5
0.0820---- 210
186
174.4
0.0830---- 212.5
188
176.3
0.0840---- 215
190
178.1
0.0850---- 217.5
192
180.0
0.0860---- 220
194
181.9
0.0870---- 222.5
196
183.7
0.0880---- 225
198
185.6
0.0890---- 227.5
200
187.5
Keep this in mind---> From a Dynojet tech rep:
We are often asked for a "cross reference" sheet that compares our main jets to Mikuni or Keihin. The fact is you cannot directly interchange the jets for a given size. Many things affect fuel flow through a jet of the same orifice size. The entry and exit tapers of our main jets differ from those of other companies. Due to this, the fuel flow changes as a function of velocity through the carburetor venture. This means that two jets of equal orifice size will have a different fuel flow curve relative to intake air speed. At a certain speed the two may flow equally, but a change in velocity changes the flow characteristics. The Dynojet main jet hole size is measured in millimeters. For example, a DJ142 has a 1.42mm hole.
Michael Cory
Research & Development
Phone: 800-992-4993 EXT. xxx
Michael@Dynojet
