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Old 10-16-2012, 06:53 AM   #6
Middleweightboxer
Middleweightboxer
 
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Joined: Feb 2005
Location: Paradise, TX
Oddometer: 673
Mikuni Jet Chart

Here is my carb tuning chart for keeping a record of your settings. Understanding the dimensions of the jets and needles really helps the jetting process. The D1 through D6 measurements are needle diameters at equal increments as you go down the needle. Sorry, the column spacing gets messed up in the post. PM me if you want an excel sheet.


Bike Date

Carb Mileage Spark Plug

Settings: Air Screw In is richer, out is leaner

Pilot Needle Jet

Main Needle

Slide Needle Clip 1 highest, 5 lowest

Mikuni VM Needle Jet Orifice Diamaters
Leaner <----------------------------------------> Richer
0 1 2 3 4 5 6 7 8 9
N 2.550 2.555 2.560 2.565 2.570 2.575 2.580 2.585 2.590 2.595
O 2.600 2.605 2.610 2.615 2.620 2.625 2.630 2.635 2.640 2.645
P 2.650 2.655 2.660 2.665 2.670 2.675 2.680 2.685 2.690 2.695
Q 2.700 2.705 2.710 2.715 2.720 2.725 2.730 2.735 2.740 2.745

Needle Taper Diameter Dimension Chart
Needle Taper
Length Starts
a b D1 D2 D3 D4 D5 D6
6H1 62.300 37.500 2.510 2.510 2.510 2.412 2.041 1.696
6DH2 62.300 28.000 2.511 2.511 2.466 2.295 2.000 1.660
6F9 62.300 28.900 2.516 2.516 2.475 2.210 1.949 1.678
6CF1 61.500 29.500 2.512 2.512 2.429 2.240 1.974 1.710
6FJ6 62.300 35.200 2.505 2.505 2.505 2.376 2.040 1.606
6DH3 62.300 22.000 2.512 2.512 2.458 2.286 1.948 1.607
6J3 62.300 36.700 2.515 2.515 2.515 2.369 1.912 1.456
6L1 62.300 37.000 2.512 2.512 2.512 2.335 1.826 1.313
6DP5 62.300 32.100 2.518 2.518 2.518 2.372 1.834 1.141
6N1 62.300 37.000 2.514 2.514 2.514 2.278 1.672 1.058
6DP1 62.300 28.900 2.511 2.511 2.476 2.312 1.748 1.075
6F3 60.500 34.200 2.512 2.512 2.512 2.313 2.050
6DH4 62.300 25.500 2.520 2.520 2.440 2.258 1.915 1.575
6J1 64.000 36.200 2.517 2.517 2.517 2.339 1.919 1.495
6DH7 62.200 28.500 2.516 2.516 2.505 2.316 2.009 1.688
6DH8 62.300 22.700 2.522 2.522 2.395 2.160 1.828 1.505

MPG:

Comments
__________________
Bill

Tiger 800XC, R1, FZ1, RD400, CB400F
R80ST, R90S, Monster S2R, Penton 125 JPS, T25T


Middleweightboxer screwed with this post 10-16-2012 at 07:02 AM
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