I thought I saw a thread on here a while back about a difference between
Mikuni and Dyno jet numbers.I have a Dyno 155 and I want to get a 160.
Does Dyno make a 160 or will I have to get a mikuni 160 and will it be the
right jump up in size?Thanks for any info.

Here is the list comparing them.

Mikuni Dynojet
140 149.3
___ 150
142.5 152.0
145 154.7
___ 155
147.5 157.3
150 160
152.5 162.7
___ 165
155 165.3
157.5 168.0
___ 170
160 170.7
162.5 173.3
___ 175
165 176.0
167.5 178.7
___ 180
170 181.3
172.5 184.0
___ 185
175 186.7
177.5 189.3
___ 190
180 192.0
182.5 194.7
___ 195
185 197.3
187.5 200
190 202.7

Thanks for the list.That will really come in handy. :D

Thanks Rage. I've been searching for the Mikuni/Dynojet comparison chart also but was not finding it.

Just a thought, but maybe this thread can be added to the FAQ's?

i have a pro circut full exhaust on my Z, and dyno jet kit needle, and it the issue of dirt wheels it says a 160 main jet, is that for a mikuni jet or dyno jet, it the dyno jet kit it only goes up to 155, so i bought a few other jets and they are mikuni, so maybe that is why i dont think its running up to full potential, if anyone can help me, i would appreciate it, thanks

Just curious.. both Mikuni and DJ main jets are measured by flow... so how can they be that different? I can see how they would be different than hex mikuni or keihin because they are diameter...

I also have the full Pro Circuit pipe and I put the Dyno kit 155 in and ran lean.
I also have no lid and no snorkel.K&N. I put a Mikuni 160 in and it was perfect.
Hope that helps. :)

I also live in central PA. That does seem like it would run lean,but if it runs good and your happy, what the hell.Where do you live? (town) I live close to Gettysburg

When I ran lean with the dyno 155 it was nocking and down on power in the
upper RPM's.Put the 160 mikuni in and the nocking went away and it ran great.
I live between York,Hanover,Gettysburg,and Dillsburg.Kinda in the center of all
of them.My elavation is 400 feet above sea level.Hope you can find the right jet.

I found this looking for info on a motorcycle I am restoring for those "other" jets you dont use.....



Carburetor Jet Tips
Carburetor Jet Tips
byCourtney Hook
12/1/00

For those of you who don't know it, you can drill your jets out for larger sizes instead of spending big bucks to acquire a vast selection. You can also solder the ends closed and redrill them smaller if you are so inclined. Of course, the millionaires among you will scoff at this, so please ignore. Those of you however like me who have more time than money can read on.

After some surfing I've calculated that you can use the following drill bits to come close to the sizes needed, or actually be bang on with many of them. So here goes. Remember that a jet marked 120 is 1.20mm in size, 135 is 1.35mm etc. Perhaps those who know more accurately can correct me if I'm way out on this, but I think I'm close.



50____#76
55____#74 approx.
60____#73
65____#71 approx.
70____#70
75____#69 approx.
80____#68
85____#66 approx.
90____#65
95____#63
100____#61
105____#59
110____#57
120____3/64th's
130____#55
140____#54 150____#53
160____1/16th's
165____#52 approx.
170____#51
180____#50
185____#49
195____#48
200____#47
205____#46
210____#45
220____#44
225____#43
230____#43 approx (close to 225)
245____#41
250____#40




--------------------------------------------------------------------------------

Let me make a suggestion on that. DON'T try and drill out your jets to the correct size. You are begging to go and buy a new one. To accomplish the jetting that the companies send to you they use CNC machines holding tolerances of .0001. No way in hell even your home drill press is going to pull that off.

anyone know where i can order a handful of mikuni jets?

Any atv store will have them. You just need the small round head version

I've got the Moose Dyno Jet kit (worthless except the needle) and every mikuni size from 147.5 to 165 and also a 25 and 27.5 pilot all from rage performance. Originally I ordered the dyno kit and got such timely service with cheap shipping (to alaska!) that my second order of mikuni jets I went with them again. I did it all over the internet with credit card. I'd deal with them again if I ever need to.

For those of you needing to jet your carbs. I found this web site very helpful in finding what elevation you are at.

Air Nav

For example, I live in Columbus Ohio.

FAA INFORMATION EFFECTIVE 19 FEBRUARY 2004
Location
FAA Identifier: CMH
Lat/Long: 39-59-52.700N / 082-53-30.800W
39-59.87833N / 082-53.51333W
39.9979722 / -82.8918889
(estimated)
Elevation: 815 ft. / 248.4 m (surveyed)
Variation: 05W (1990)
From city: 6 miles E of COLUMBUS, OH

popo35,

Great Link!

sweet. Im like 20-50 feet above sea level and im gonna put a billet power tip and my k&n on what do you think i should do with the jetting? Should i buy a kit or just get a couple of jets and what size do i need??

I would suggest a 155 main mikuni. If you free up the intake by removing the baffel (just slides of by the tank under the seat, release the tabs on both sides) install a k/n and free up the exhaust, thats what i would run. If it hesitates on acceleration, then its too lean on the air jet/ pilot jet. Try adjusting the air jet first but if you go out more than 3 turns or so than go up on your pilot jet because the air jet can fall out since it's barely in there. later..

what is a 144 dyno work out to be? 136?

Found this and thought it was an interesting adder.

I have a 04 Z-400 with a T-4 slip on, K&N filter (no adapter) and a dyno jet kit, and I don't think the jet kit is putting out it's true potential power wise. How can I tell though?

Bryan

My friends I might ride at Pueblo, CO one weekend. (4726 ft). Then the next weekend be in Divide, CO (~9200 ft). We have also travelled 3 hours to Taylor Park to ride (~13500 ft).

TRY JETTING FOR THAT! I just bought the Dyno Jet kit, a PC T-4 slipon and a Powerlid. I have a lot of experimenting to do.........

can anyone tell me the difference in Keihin jets and Dyna jets?

I have YFZ carbs...searched on yfzcentral.com but no answer.

Thanks guys

nobody?

Other than thread size I would say nothing.They should both measure flow rate.

You may want to try just cutting 1" holes in your lid and taping them until it's correct for your elevation.

I thought bvstone set us straight a LONG time ago. He said the only ones that were different were the round vs. the hex shaped jets. What is your source, RAGE?

Heres an interesting chart with all three brands of jets.....

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