TechTalk:                   Mikuni OE Jetting Table

Standard 40PHH - 97, 98
Standard 44PHH 41, 42
Description
Part No.
Size
Part No.
Size
Main Jet
N100.604
140
N100.604
150
Main Air Jet
B42/56
180
B42/55
200
Pilot Jet
N101.043
57.5
N101.043
57.5
Pilot Air Jet
-
1.4
-
1.2
Venturi, Large
N121.015
32
N107.203
34
Venturi, Small
N121.106
12-16
N101.205
10.5-14
Throttle Valve
N101.038
165
N101.203
175
Jet Block Assembly
N101.188
5.8(6x2.5 & 4x1.5)
N101.253
OA
Bleed Pipe
N101.190
T
   
Needle Valve
N115.037
1.5
N115.037
1.8
Pump Nozzle
N121.033
40
N102.202
40
Pilot Screw
-
1.0 Turns
-
1.125 Turns
These specs are not for specific applications, these are how the carbs come jetted right out of the box.