• Required reading for all forum users!!!

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Everyone needs this chart!!!!!!!!!

i have had a cross reference chart like that saved in my favourites for years. i think that chart (or equivalent) is posted in just about every bike related forum i have ever visited.

does come in very handy for quick comparisons at a glance
 
I too have had it in my favs for a long time Adrian. I posted it because true to form, you get the guy kike the one that just posted about cutting off his pipes and adding pods.

They think its a "great idea" but have no clue as to what to do after they put down the sawzalls!!!
 
Keihin, Dynojet, Mikuni Jet Size Cross Reference

All Hole Diameters Are in Inches

Hole Dia”---Keihin # -- DynoJet # -- Mikuni #
0.0350---- 92.5--------- 92----------- 86.3
0.0360---- 95----------- 94----------- 88.1
0.0370---- 97.5--------- 96----------- 90
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
0.0460---- 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
0.0540---- 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
0.0620---- 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
0.0700---- 180--------- 162--------- 151.9
0.0710---- 182.5------- 164--------- 153.8
0.0720---- 185--------- 166--------- 155.6
0.0730---- 187.5------- 168--------- 1575
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
0.0780---- 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
0.0860---- 220--------- 194--------- 181.9
0.0870---- 222.5------- 196--------- 183.7
0.0880---- 225--------- 198--------- 185.6
0.0890---- 227.5------- 200--------- 187.5
 
:)Thanks!
Any idea what size id need for a GS650 with the pipes cut off at the footpegs and running pod air filters?

Probably ordering them friday
 
I have been looking at flow rates of different jets for years and have found out that the actual orifice diameter has different effects depending on how the jet is designed as far as tapers, inlet, and outlet angles, etc. I have found some articles in the past. These are a few. http://faq.ninja250.org/wiki/Dynojet_-_Mikuni_-_Keihin_jet_sizes_conversion "Note" Notice how the Dynojet part numbers are actually the measured diameters in mm's, go figure,and this ORIFICE THEORY
For nozzles, bypass jets, carb jets
A sharp edge at the orifice entrance causes the flow stream to converge, the smallest flow cross section being termed the vena contracta and is the point of lowest pressure. The vena results in less flow through a given hole size than a piece with a rounded entrance.
gfp.gif

The particle of fuel coming straight down a bit off to the left or in at an angle at the right both find their way into the hole.
This design is the least sensitive to machine marks, but the blend of the radius to the bore is very important Not easily damaged, as nicks from handling tend to be on the top surface.
The particle a bit off to the left tends to hit the top surface; may bounce off to the left, or into the hole. The particle coming in from the right will go into the hole.
This design is quite difficult to make, as the sharp edge must be the same on all the holes, with no nicks. It is easily damaged by nicking the edge.
The particle a bit off to the left will not enter the hole. The particle coming in from the right may not enter the hole.
You would never really see this design in a jet, but it is exactly like a ramtube without a bell. The top edge is easily damaged.

We use only fully radiused type orifice approaches in all our nozzles and jets. Every nozzle and jet we make is done with great care, but they still don't all turn out properly. Each piece is flowed at three different pressures, then compared to the master flow sheet If it isn't within tolerance, it is scrapped. Testing at three pressures is important because some pieces will flow perfect at low flows, but then go turbulent (due to imperfections on the surface) at high flows.... we call this a "shift" in the flow. All of this quality control costs more money, but it assures you of receiving the best possible peices in the industry. This article was found from Kinsler fuel injection Barry Grant also has some interesting articles on different jet size flow compared to different type of designs.
 
Last edited:
Leland1 said:
:)Thanks!
Any idea what size id need for a GS650 with the pipes cut off at the footpegs and running pod air filters?

Probably ordering them friday
Click to expand...

Get a Dynojet kit- seems to be the best way to go. Call them for your exact needs.
 
Well...if its rich withn the original ones, then for sure your not gonna drill them.

So, if its lean, I would go up one at a time and when she gets close..then figure out if its good or you wanna go yet one lore???
 
chuck hahn said:
Well...if its rich withn the original ones, then for sure your not gonna drill them.

So, if its lean, I would go up one at a time and when she gets close..then figure out if its good or you wanna go yet one lore???
Click to expand...


This coming from a man who just rebuilt his first carb not even a year ago?
PFFT:cool:
 
Nah..its been 4 or 5 years ago Todd. and many many more sets from all kinds of bikes. So yeah I think I am experiencd enough to know what I am talking about. Got a problem with it???
 
Glad your so jealous of me for learning and developing skills..I never knew that I was so IMPORTANT to you!!

Maybe someday youll learn too, but for now just go puff on that pipe bro!!!!!
 
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