Keihin jets vs. Dynojet jets

I found this list online. It's original source is unknown to me. Can anyone confirm its accuracy? I understand that Dynojet main jets use the metering hole measurement (measured at the threaded end) as the jet ID number. For example a DJ 150 has a 1.5mm (.059 inch) hole on the threaded side. That doesn't jive with the chart--BUT, I understand that DJ jets have a slightly tapered hole. So maybe that explains the discrepency??

Thoughts??

Width------Kehein # -- 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

How can one physically distinguish between the two brands? Do Keihen jets have a little star next to the number?

in actual maesured a/f ratio they are much closer than that.

simply said - is a dyno 160 main equivelant to a Keihin 158 main

no, much more factors into the flow of the jet than just the opening size. Like Burned said, they both flow almost the same amount because they are all rated using the same system.

no, much more factors into the flow of the jet than just the opening size. Like Burned said, they both flow almost the same amount because they are all rated using the same system.

so then (bare with me I am not a smart man:excuseme: I am fine running a DJ 160 main with an FMF Q2 a sea level. (I have a 55 Keihin pilot in and am at 2 1/4 turns out) Bike seems to run fine! just wondered if I shoud fatten up the main or not.

if it runs fine,ride it!

I like that - simple answer :-)