Jet size comparison

[XSokieSPECIAL]

 That would be great Brian. PMed you my email addy.

[Brian]

Try the version on the UK forum here, it's got the Sport and XJ1100 models as well.

(Okie, I can email you a formatted version so you can post up a table with straight columns if you like.)

[excess.11]

Left click on the jpeg on your flicker site.............and select.........."save picture as"...
it worked for me and saved a copy.

[melbxs]

It's a screenshot of a table of data that I couldn't copy either 

It's just a JPG.

URL is:

http://farm7.static.flickr.com/6104/6339528191_11b266cf24_b.jpg

It's on my flickr site, so it shouldn't ever disappear.

[XSokieSPECIAL]

 Brian, I like this chart. I can't seem to copy it to put it in the "Fixes and Mods" forum on XS11.org. Would you please share the link to it with me?

 Thank you bro'

[melbxs]

[Christian Raith]

And here is their main page, a wealth of info and Marc has emailed me with some suggestions already.
Factory Pro

http://www.factorypro.com/index.htm

[melbxs]

Marc Salvisberg of Factory Pro Tuning also has a writeup on tuning CV carbs that looks great. He has asked people not to cut npaste it, so here's a link to his web-site.


http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html

[melbxs]

Found this on another site, thought it was worth preserving:

Width------Keihin # -- DynoJet # -- 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

Some illuminating comments from a pro:

Keihin "393" series:
The Keihin sizing is pretty close to right (ish). Close enough for hand drilling a jet when you don't have what you need. A 150 is 1.50mm in diameter.

Factory Pro "393 K Series":
The Factory Pro "K Series" jets are also dimensionally sized, just like the Keihin jets.
Example: a "150" Keihin or "K Series" main jet is usually 1.50mm in diameter.

Dynojet:
According to dynojet, http://planetminis.com/f21/finally-f...-52984.htmlthe dynojets are supposed to be sized the same as Keihin (dimensionally)- but I've never found that to be true.

As far as different lead-in angles and such, I'm guessing that that difference is more that metric manufactured K and M jets tend to have a std metric 90 degree included lead-in included angle and USA manufactured jets tend to be 82 degree included angle. I could be wrong on the lead-in angle, but I remember that that dj is different. It was 20+ years ago that we started making Keihin and Mikuni style jets.

Mikuni N102221 (small round slotted jets)
That part of the chart is wrong. The gist is right, but, the holes sizes are wrong.
You have to take a selection of jets, across the entire range, measure and create a curve for them to be correct.

Summation -
If you have a pile of a certain brand of jet and you want to use them, it's up to you. I've seen and tuned Keihin carbs jetted with Mikuni jets that "squeak" that last 1/2 turn (the threads are .05mm pitch different) and vice versa. Heck - I've even used dynojet jets if that's what's available.

SO.....If you are using a particular brand of jet, don't swap brands of jets using this dj and Mikuni cross reference chart.

If you are drilling jets (reaming is preferred, btw) then, you'll likely find that a Keihin, dj and Mikuni jet, with the same orifice sizes, flow very similarly.

If you take the decimal inch size and multiply by 25.4, you'll get the metric dimension and the Keihin / Factory Pro jet sizes.

Example: .0390" hole x 25.4mm = .9906mm hole (or essentially a "100" Keihin or Factory Pro "393 K Series" 100 main jet.

Thanks -

Marc Salvisberg
Factory Pro Tuning