Dynojet to Keihn jet size diff,

[Sjorge450R]

What is the equivalent to a 128 dyno jet?

[2004exrider]

hole-----Kehein #--- DynoJet #---Mikuni #
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

128 must be pretty small:eek:

Jimmy

[Sjorge450R]

Originally posted by 2004exrider
hole-----Kehein #--- DynoJet #---Mikuni #
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

128 must be pretty small:eek:

Jimmy

thanks, yeah 128 is small its for a 300ex so yeah. Its like a 135 keihn then.

[GPracer2500]

Originally posted by 2004exrider
hole-----Kehein #--- DynoJet #---Mikuni #
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

128 must be pretty small:eek:

Jimmy

Hey, that's some good info right there. Whereja' find it??

[2004exrider]

Someone on here posted it a while back and i couldnt see not copying it. I knew i or someone else would probably need it, i guess im a pack rat of this kind of stuff:bandit:

Jimmy

[GPracer2500]

Originally posted by 2004exrider
Someone on here posted it a while back and i couldnt see not copying it. I knew i or someone else would probably need it, i guess im a pack rat of this kind of stuff:bandit:

Jimmy

Me too. :p

I snagged one line from that list and googled it--found the same list but with more data. Notice how close they are with the really tiny jets:

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

[chapmanmd]

GREAT info. Thanks guys.

[Sjorge450R]

i didnt think I was running a 135 keihin. Damn. And im still lean. Prob going to have to move up to a 140 on my 300ex

[chapmanmd]

Dang bro, what mods do you have to that motor?

[Sjorge450R]

Originally posted by chapmanmd
Dang bro, what mods do you have to that motor?


:D :D :D :D :D

[2004exrider]

Originally posted by GPracer2500
Me too. :p

I snagged one line from that list and googled it--found the same list but with more data. Notice how close they are with the really tiny jets:

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

Successfully added to my Folder, lol:macho

Jimmy

[EXevan91]

lol this could come in handy :D
"copy and paste"

[bwamos]

Great chart.

But it's not going to be an exact match. But will be a great starting point.

Dynojets and the Keihin/Mikuni's are measured differently.

Dynojets numbers are simply the hole diameter. A 140DJ main has a 1.40mm (0.055") diameter hole in it at the threaded end. A mikuni 140 Mikuni has a 140 cc's of fuel flow per minute. And, I honestly have no idea how Keihins are measured.. lol.

[GPracer2500]

Originally posted by bwamos
[snip]...Dynojets numbers are simply the hole diameter. A 140DJ main has a 1.40mm (0.055") diameter hole in it at the threaded end...[snip]

Well if that's the case then that chart isn't really all that accurate.

For example, the chart shows a DJ 164 = .071 inches. But 1.64mm is actually .064 inches. That's about six jets off...

:confused:

However, what do you mean by "at the threaded end". Is the hole a different diameter at the other end on DJs? We're talking about the hole that actually meters the fuel right? Wouldn't that hole be the same size if measured from either end?

[chapmanmd]

Dynojet jets have some kind of venturi effect they claim. I dont know if thats due to different openings at opposite ends or not.

[GPracer2500]

Originally posted by chapmanmd
Dynojet jets have some kind of venturi effect they claim. I dont know if thats due to different openings at opposite ends or not.

Hmmm...so maybe the chart IS accurate.

:confused: :confused:

[chapmanmd]

Beats the hell out of me!!! The size holes dont mean anything to me anyway. I just go by the numbers and what makes my quads run well!

[bwamos]

Aye, I beleive the hole on the face of the dynojet is ever so slightly smaller.

That chart seems to be off to me though a bit.

I dont see a bone stock 300ex, w/ aftermarket pipe, K&N filter, and no airbox lid running a 137 Keihin. That's a awful big jump from the 122 stock main.

The Dynojet kit sets it at a 128 Main which would be an 0.0504 diameter hole. Wich according tot eh chart would actually be between a 130-132 keihin. Which is what I usually reccomend as a starting point for that setup. That's a lot closer than the 137 in my opinion.

However, hole diameter doesn't really mean squat since they all flow differently.

I would say shift the DJ's down a couple slots and it would be close enough for a starting point.

[chapmanmd]

so is that a 138 keihin or dj in your sig for your setup?

[GPracer2500]

I'm going to commission a Blue Ribbon panel of expert scientists: full laboratory, staff of hundreds (if need be), mass spectrometers, particle accelerators, flux capaciters, etc. etc. I figure the effort should be on par with the Apollo space program.

We need answers, damn it!!

:p

[chapmanmd]

AYE!! Git R Done!

[Chino886]

:eek2:

[chapmanmd]

If you remove most of this bs it is!

[bwamos]

Originally posted by chapmanmd
so is that a 138 keihin or dj in your sig for your setup?

It's a Keihin. I'm actually running a 142k now. Need to update my profile. It ran great, but was a tad lean (in the 14:1 range). Wanted to cool the motor down some. The 142 puts me right at 13.2:1 through most of the rpms.

[chapmanmd]

Thanks.