Carburetor jet increase question

[Slimm]

When going up 1 in jets, do you go up numerically to the next number or does going up 1 mean go up the next jet size? I've read and talked myself into retardation tonight and now I've cornfused and crossthreaded myself!

I think going up 1 means the next biggest jet because sometimes there is no next number up jet.
EX: going from an .082 up one size would be go to .084 since there is no .083.

Sometime toss me a lifeline please :)


Slimm

[Slimm]

Also, does anyone know of a chart that gives the orifice diameter of jets?

Slimm

[58Evinrude]

Yup, you are right. Going up one means going to the next size bigger. I don't know about the black motors, but with OMC stuff the jet number is the jet size.

[FORBESAUTO]

That's correct the size is the thousandths of an inch of the oriface. They come in .002 increments. Your thinking is exactly correct.

[vnemous]

I dont know if this helps Scott

http://i260.photobucket.com/albums/ii3/vnemous/mercury_jet_sizes_talon2.5_zpsp8vt1vf4.jpg (http://s260.photobucket.com/user/vnemous/media/mercury_jet_sizes_talon2.5_zpsp8vt1vf4.jpg.html)

[Slimm]

Thanks for all the help guys, YES Mike that is EXACTLY what I was looking for.


Slimm

[HStream1]

http://www.jetsrus.com/FAQs/FAQ_drill_size_decimal_equivalents.html

DRILL SIZE DECIMAL EQUIVALENTS



Drill size
Diameter (in)
Diameter (mm)


#107
0.0019
0.0483


0.05 mm
0.002
0.05


#106
0.0023
0.0584


#105
0.0027
0.0686


#104
0.0031
0.0787


#103
0.0035
0.0889


#102
0.0039
0.0991


0.1 mm
0.0039
0.1


#101
0.0043
0.1092


#100
0.0047
0.1194


#99
0.0051
0.1295


#98
0.0055
0.1397


#97
0.0059
0.1499


#96
0.0063
0.16


#95
0.0067
0.1702


#94
0.0071
0.1803


#93
0.0075
0.1905


0.2 mm
0.0079
0.2


#92
0.0079
0.2007


#91
0.0083
0.2108


#90
0.0087
0.221


#89
0.0091
0.2311


#88
0.0095
0.2413


#87
0.01
0.254


#86
0.0105
0.2667


#85
0.011
0.2794


#84
0.0115
0.2921


0.3 mm
0.0118
0.3


#83
0.012
0.3048


#82
0.0125
0.3175


#81
0.013
0.3302


#80
0.0135
0.3429


#79
0.0145
0.368


1/64 in
0.0156
0.3969


0.4 mm
0.0158
0.4


#78
0.016
0.4064


#77
0.018
0.4572


0.5 mm
0.0197
0.5


#76
0.02
0.508


#75
0.021
0.5334


#74
0.0225
0.5715


0.6 mm
0.0236
0.6


#73
0.024
0.6096


#72
0.025
0.635


#71
0.026
0.6604


0.7 mm
0.0276
0.7


#70
0.028
0.7112


#69
0.0292
0.7417


#68
0.031
0.7874


1/32 in
0.0313
0.7938


0.8 mm
0.0315
0.8


#67
0.032
0.8128


#66
0.033
0.8382


#65
0.035
0.889


0.9 mm
0.0354
0.9


#64
0.036
0.9144


#63
0.037
0.9398


#62
0.038
0.9652


#61
0.039
0.9906


1 mm
0.0394
1


#60
0.04
1.016


#59
0.041
1.0414


#58
0.042
1.0668


#57
0.043
1.0922


1.1 mm
0.0433
1.1


#56
0.0465
1.1811


3/64 in
0.0469
1.1906


1.2 mm
0.0472
1.2


1.3 mm
0.0512
1.3


#55
0.052
1.3208


#54
0.055
1.397


1.4 mm
0.0551
1.4


1.5 mm
0.0591
1.5


#53
0.0595
1.5113


1/16 in
0.0625
1.5875


1.6 mm
0.063
1.6


#52
0.0635
1.6129


1.7 mm
0.0669
1.7


#51
0.067
1.7018


#50
0.07
1.778


1.8 mm
0.0709
1.8


#49
0.073
1.8542


1.9 mm
0.0748
1.9


#48
0.076
1.9304


5/64 in
0.0781
1.9844


#47
0.0785
1.9939


2 mm
0.0787
2


#46
0.081
2.0574


#45
0.082
2.0828


2.1 mm
0.0827
2.1


#44
0.086
2.1844


2.2 mm
0.0866
2.2


#43
0.089
2.2606


2.3 mm
0.0906
2.3


#42
0.0935
2.3749


3/32 in
0.0938
2.3813


2.4 mm
0.0945
2.4


#41
0.096
2.4384


#40
0.098
2.4892


2.5 mm
0.0984
2.5


#39
0.0995
2.5273


#38
0.1015
2.5781


2.6 mm
0.1024
2.6


#37
0.104
2.6416


2.7 mm
0.1063
2.7


#36
0.1065
2.7051


7/64 in
0.1094
2.7781


#35
0.11
2.794


2.8 mm
0.1102
2.8


#34
0.111
2.8194


#33
0.113
2.8702


2.9 mm
0.1142
2.9


#32
0.116
2.9464


3 mm
0.1181
3


#31
0.12
3.048


3.1 mm
0.1221
3.1


1/8 in
0.125
3.175


3.2 mm
0.126
3.2


#30
0.1285
3.2639


3.3 mm
0.1299
3.3


3.4 mm
0.1339
3.4


#29
0.136
3.4544


3.5 mm
0.1378
3.5


#28
0.1405
3.5687


9/64 in
0.1406
3.5719


3.6 mm
0.1417
3.6


#27
0.144
3.6576


3.7 mm
0.1457
3.7


#26
0.147
3.7338


#25
0.1495
3.7973


3.8 mm
0.1496
3.8


#24
0.152
3.8608


3.9 mm
0.1535
3.9


#23
0.154
3.9116


5/32 in
0.1563
3.9688


#22
0.157
3.9878


4 mm
0.1575
4


#21
0.159
4.0386


#20
0.161
4.0894


4.1 mm
0.1614
4.1


4.2 mm
0.1654
4.2


#19
0.166
4.2164


4.3 mm
0.1693
4.3


#18
0.1695
4.3053


11/64 in
0.1719
4.3656


#17
0.173
4.3942


4.4 mm
0.1732
4.4


#16
0.177
4.4958


4.5 mm
0.1772
4.5


#15
0.18
4.572


4.6 mm
0.1811
4.6


#14
0.182
4.6228


#13
0.185
4.699


4.7 mm
0.185
4.7


3/16 in
0.1875
4.7625


4.8 mm
0.189
4.8


#12
0.189
4.8006


#11
0.191
4.8514


4.9 mm
0.1929
4.9


#10
0.1935
4.9149


#9
0.196
4.9784


5 mm
0.1969
5


#8
0.199
5.0546


5.1 mm
0.2008
5.1

[Slimm]

WoW Bud, that's some detailed info right there!
You amaze me with the info you have at hand at any given time, you must have been around a long time or been elbow deep in lots of hobbies over the years. Thank you buddy.


Slimm



http://www.jetsrus.com/FAQs/FAQ_drill_size_decimal_equivalents.html

DRILL SIZE DECIMAL EQUIVALENTS





Drill size
Diameter (in)
Diameter (mm)


#107
0.0019
0.0483


0.05 mm
0.002
0.05


#106
0.0023
0.0584


#105
0.0027
0.0686


#104
0.0031
0.0787


#103
0.0035
0.0889


#102
0.0039
0.0991


0.1 mm
0.0039
0.1


#101
0.0043
0.1092


#100
0.0047
0.1194


#99
0.0051
0.1295


#98
0.0055
0.1397


#97
0.0059
0.1499


#96
0.0063
0.16


#95
0.0067
0.1702


#94
0.0071
0.1803


#93
0.0075
0.1905


0.2 mm
0.0079
0.2


#92
0.0079
0.2007


#91
0.0083
0.2108


#90
0.0087
0.221


#89
0.0091
0.2311


#88
0.0095
0.2413


#87
0.01
0.254


#86
0.0105
0.2667


#85
0.011
0.2794


#84
0.0115
0.2921


0.3 mm
0.0118
0.3


#83
0.012
0.3048


#82
0.0125
0.3175


#81
0.013
0.3302


#80
0.0135
0.3429


#79
0.0145
0.368


1/64 in
0.0156
0.3969


0.4 mm
0.0158
0.4


#78
0.016
0.4064


#77
0.018
0.4572


0.5 mm
0.0197
0.5


#76
0.02
0.508


#75
0.021
0.5334


#74
0.0225
0.5715


0.6 mm
0.0236
0.6


#73
0.024
0.6096


#72
0.025
0.635


#71
0.026
0.6604


0.7 mm
0.0276
0.7


#70
0.028
0.7112


#69
0.0292
0.7417


#68
0.031
0.7874


1/32 in
0.0313
0.7938


0.8 mm
0.0315
0.8


#67
0.032
0.8128


#66
0.033
0.8382


#65
0.035
0.889


0.9 mm
0.0354
0.9


#64
0.036
0.9144


#63
0.037
0.9398


#62
0.038
0.9652


#61
0.039
0.9906


1 mm
0.0394
1


#60
0.04
1.016


#59
0.041
1.0414


#58
0.042
1.0668


#57
0.043
1.0922


1.1 mm
0.0433
1.1


#56
0.0465
1.1811


3/64 in
0.0469
1.1906


1.2 mm
0.0472
1.2


1.3 mm
0.0512
1.3


#55
0.052
1.3208


#54
0.055
1.397


1.4 mm
0.0551
1.4


1.5 mm
0.0591
1.5


#53
0.0595
1.5113


1/16 in
0.0625
1.5875


1.6 mm
0.063
1.6


#52
0.0635
1.6129


1.7 mm
0.0669
1.7


#51
0.067
1.7018


#50
0.07
1.778


1.8 mm
0.0709
1.8


#49
0.073
1.8542


1.9 mm
0.0748
1.9


#48
0.076
1.9304


5/64 in
0.0781
1.9844


#47
0.0785
1.9939


2 mm
0.0787
2


#46
0.081
2.0574


#45
0.082
2.0828


2.1 mm
0.0827
2.1


#44
0.086
2.1844


2.2 mm
0.0866
2.2


#43
0.089
2.2606


2.3 mm
0.0906
2.3


#42
0.0935
2.3749


3/32 in
0.0938
2.3813


2.4 mm
0.0945
2.4


#41
0.096
2.4384


#40
0.098
2.4892


2.5 mm
0.0984
2.5


#39
0.0995
2.5273


#38
0.1015
2.5781


2.6 mm
0.1024
2.6


#37
0.104
2.6416


2.7 mm
0.1063
2.7


#36
0.1065
2.7051


7/64 in
0.1094
2.7781


#35
0.11
2.794


2.8 mm
0.1102
2.8


#34
0.111
2.8194


#33
0.113
2.8702


2.9 mm
0.1142
2.9


#32
0.116
2.9464


3 mm
0.1181
3


#31
0.12
3.048


3.1 mm
0.1221
3.1


1/8 in
0.125
3.175


3.2 mm
0.126
3.2


#30
0.1285
3.2639


3.3 mm
0.1299
3.3


3.4 mm
0.1339
3.4


#29
0.136
3.4544


3.5 mm
0.1378
3.5


#28
0.1405
3.5687


9/64 in
0.1406
3.5719


3.6 mm
0.1417
3.6


#27
0.144
3.6576


3.7 mm
0.1457
3.7


#26
0.147
3.7338


#25
0.1495
3.7973


3.8 mm
0.1496
3.8


#24
0.152
3.8608


3.9 mm
0.1535
3.9


#23
0.154
3.9116


5/32 in
0.1563
3.9688


#22
0.157
3.9878


4 mm
0.1575
4


#21
0.159
4.0386


#20
0.161
4.0894


4.1 mm
0.1614
4.1


4.2 mm
0.1654
4.2


#19
0.166
4.2164


4.3 mm
0.1693
4.3


#18
0.1695
4.3053


11/64 in
0.1719
4.3656


#17
0.173
4.3942


4.4 mm
0.1732
4.4


#16
0.177
4.4958


4.5 mm
0.1772
4.5


#15
0.18
4.572


4.6 mm
0.1811
4.6


#14
0.182
4.6228


#13
0.185
4.699


4.7 mm
0.185
4.7


3/16 in
0.1875
4.7625


4.8 mm
0.189
4.8


#12
0.189
4.8006


#11
0.191
4.8514


4.9 mm
0.1929
4.9


#10
0.1935
4.9149


#9
0.196
4.9784


5 mm
0.1969
5


#8
0.199
5.0546


5.1 mm
0.2008
5.1

[rude tim]

Going up .001 is a verry little change. Unless it is a full on race engine that you are looking for the last couple of hp it might be worth it, but on a lake engine it is a waste of time. Also unless you are using a reamer you will not hold tolerance within .001.

[FMP]

Temperature and humidity will change things faster than you can change 0.001 size.