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Discussion Starter · #1 · (Edited)
Here is a useful table for conversion from Dynojet MJs to Keihin MJs from www.700v.com

Dynojet ---- Keihin
122 -------- 135
124 -------- 138
126 -------- 140
128 -------- 142
132 -------- 145
134 -------- 148
136 -------- 150
138 -------- 152
142 -------- 155
144 -------- 158
146 -------- 160
148 -------- 162
 

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Or in this range, simply remove "14" to Keihin number to approximate to Dynojet's.

But it's not only that the number differs; it's also that the MJ flows differently. I can't tell which one is "better"; I can just say they do not flow the same.

Finally, I think the numbers are different because Keihin and Factory Pro MJ are numbered as per the main hole diameter while Dynojet are numbered as per the MJ flow (in CFM or probably another scale).
 

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The other way around,

Mikuni/Keihin/FactoryPro jets bores are based
on cc's per minute IE 150 = 150 cc's per minute

Dynojet jets are based on bore size
IE 150 = 1.5mm = .059" = drill #53
 
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