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drill a jet chart?

15587 Views 12 Replies 5 Participants Last post by  Kenny4, 
DIXIETUFF
While watching the big dogs tune their bikes (Gauge, Tom, Cajun) I noticed that they have a chart that they use to drill out jets to different sizes. (they also never let out of their site!)

Where can I find this chart?

Exactly what drill bit set do I need to buy to be able to use the chart?
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aaron_j
theyre not tuning with pump gas sweet cheeks. 700v.com has the standard chart and i can get most bits from work, just tell me what ud like to try! n ive never let u down with my 5 finger discounts
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Kenny4
"Five finger discount"---Shame on you:p:p

Kenny
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DIXIETUFF
doesnt matter what fuel they are using. Not a chart tat converts dnyajet to kelhin the chart stops u from ordering all kinds of different sizes. And it is a special drill bit set. Not just like 1/8"
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VFORCEJOHN
#43 or ~3/32 drill bit is about a 235
5/64's is a 215
1/8th is about a 255

you can average out the sizes between them for inbetween sizes for over 200 mains

if you need over 200 size jets, buy factory pro ones. they go to 250. that's all you'll ever need. they are more exact than drilling, and hold better tolerance

I wouldn't drill them under 200 size. spend the 3.00 and buy the right jet. unless it's done in a machine and under strict tolerances. the chances you picking up a drill and bit to make a 180 jet is very slim, there's error in doing it that way, but if you have an a/f meter, all you need to do is drill until you shoot for that # who cares what it looks like or how tolerant it is

John
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Kenny4
Will this help at all

Drill Size Conversion Table

http://www.affordablegokarts.com/Drilling Main Jets.php

Kenny
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DIXIETUFF
Thanks John I have from 188's thru 200's now. When te muzzy SP gets here I really want to get it right. never was perfect with the HMF's but always ran real good.

-Greg
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VFORCEJOHN
DIXIETUFF said:
doesnt matter what fuel they are using. Not a chart tat converts dnyajet to kelhin the chart stops u from ordering all kinds of different sizes. And it is a special drill bit set. Not just like 1/8"
Click to expand...

there are only 3 size charts that I know of for different drill bits.

There's Metric sizing. measured in MM various incremental changes pending on bit size. (smaller bits are closer tolerances to eachother)

There's Fractional. like 5/64, 3/32, 1/8 big incremental changes

and there's a finer range that are defined by Number and Letter gauges. (they are the bits you want)

they are fine incremental changes and cover a wide variety of sizes and can drill 180-182-185 sizes, (IF YOU CAN HOLD DRILLING TOLERANCE for example steady hand).
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Andycyprus
Dixie the following should also help you out :)

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


MillimetersInchesDesignationTap Drill/Pilot Drill Uses.3429mm.0135"#80 .3683mm.0145"#79 .3969mm.015625"1/64"#0 Pilot, Soft-Wood.4064mm.016"#78 .4572mm.018"#77 .5mm.0197" .508mm.02"#76 .5334mm.021"#75 .5715mm.0225"#74 .6096mm.024"#73 .635mm.025"#72 .6604mm.026"#71 .7112mm.028"#70 .74168mm.0292"#69 .75mm.0295" M1x.25 coarse.7874mm.031"#68 .7938mm.03125"1/32"#0 Pilot, Hard-Wood #1 Pilot, Hard & Soft-Wood #2 Pilot, Soft-Wood.8128mm.032"#67 .8382mm.033"#66 .85mm.0335" M1.1x.25 coarse.889mm.035"#65 .9144mm.036"#64 .9398mm.037"#63 .95mm.0374" M1.2x.25 coarse.9652mm.038"#62 .9906mm.039"#61 1mm.0394" 1.016mm.04"#60 1.0414mm.041"#59 1.0668mm.042"#58 1.0922mm.043"#57 1.1mm.0433" M1.4x.3 coarse1.1811mm.0465"#56 1.1906mm.046875"3/64"#0-80 UNF#2 Pilot, Hard-wood, #3 Pilot, Soft-Wood #4 Pilot, Soft-Wood1.25mm.0492" M1.6x.35 coarse1.3mm.0512" M1.7x.35 coarse1.3208mm.052"#55 1.397mm.055"#54 1.45mm.0571" M1.8x.35 coarse1.5mm.0591" 1.5113mm.0595"#53#1-64 UNC, #1-72 UNF1.5875mm.0625"1/16"#0 Wood Shank Hole, #3 Pilot, Hard-Wood, #4 Pilot, Hard-wood #5 Pilot, Soft-wood, #6 Pilot, Soft-wood, #7 Pilot, Soft-wood1.6mm.063" M2x.4 coarse1.6129mm.0635"#52 1.7018mm.067"#51 1.75mm.0689" M2.2x.45 coarse1.778mm.07"#50#2-64 UNF, #2-56 UNC1.8542mm.073"#49 1.9304mm.076"#48 1.9844mm.078125"5/64"#1 Wood Shank Hole#5 Pilot, Hard-wood, #6 Pilot, Hard-wood #8 Pilot, Soft-wood, #9 Pilot, Soft-wood1.9939mm.0785"#47#3-48 UNC2mm.0787" 2.05mm.0807" M2.5x.45 coarse2.0574mm.081"#46 2.0828mm.082"#45#3-56 UNF2.1844mm.086"#44 2.2606mm.089"#43#4-40 UNC2.3749mm.0935"#42#4-48 UNF2.3813mm.09375"3/32"#2 Wood Shank Hole, #7 Pilot, Hard-wood, #8 Pilot, Hard-wood, #10 Pilot, Soft-wood, #11 Pilot, Soft-wood2.4384mm.096"#41 2.4892mm.098"#40 2.5mm.0984" M3x.5 coarse2.5273mm.0995"#39 2.5781mm.1015"#38#5-40 UNC2.6416mm.104"#37#5-44 UNF2.7051mm.1065"#36#6-32 UNC2.7781mm.109375"7/64"#3 Wood Shank Hole, #4 Wood Shank Hole, #9 Pilot, Hard-wood #10 Pilot, Hard-wood, #12 Pilot, Soft-wood, #14 Pilot, Soft-wood2.794mm.11"#35 2.8194mm.111"#34 2.8702mm.113"#33#6-40 UNF2.9mm.1142" M3.5x.6 coarse2.9464mm.116"#32 3mm.1181" 3.048mm.12"#31 3.175mm.125"1/8"#5 Wood Shank Hole, #11 Pilot, Hard-wood, #12 Pilot, Hard-wood3.2639mm.1285"#30 3.3mm.1299" M4x.7 coarse3.4544mm.136"#29#8-32 UNC, #8-36 UNF3.5mm.1378" M4x.5 Fine3.5687mm.1405"#28 3.5719mm.140625"9/64"
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DIXIETUFF
Damn Andy you type excelent! :rolleyes:

Thx bro
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Andycyprus
Sorry but the second lot of info there looks like a lot of mumbo jumbo but I copied and pasted it off my computer and it is actually a neat list :confused:
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Andycyprus
DIXIETUFF said:
Damn Andy you type excelent! :rolleyes:

Thx bro
Click to expand...
If only :lol:, no problem :)
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Kenny4
Here's another

Drill Size Comparison Table


Kenny
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