My first project bike (82 GS750T)

[AX2007]

Found it! 42.5 on the pilot jets.

[psyguy]

124 wouldn't be Dynoyet marking I don't think (more likely 160 would be the size for your bike). check out the specs in the "carb thread"
124 is however not Mikuni designation either... (but 125 could be)

pilot jets are not part of the DJ kit for the 850, not sure about your bike though

[AX2007]

124 wouldn't be Dynoyet marking I don't think (more likely 160 would be the size for your bike). check out the specs in the "carb thread"
124 is however not Mikuni designation either... (but 125 could be)

pilot jets are not part of the DJ kit for the 850, not sure about your bike though

It seems that the DynoJet kit offers two size main jets, 124 and 130 http://www.dynojet.com/pdf/3315.pdf and the stock mains are 112.5 http://www.thegsresources.com/_forum...et+size&page=7

and

http://www.thegsresources.com/_forum...t+size&page=14

I don't think they are stock as they don't have the square Mikuni logo on them like the pilot jets do. I'll give it a shot with the 124's, and see what happens.

I also found this company, that sells what appears to be actual Mikuni main jets:http://www.pjmotorsports.com/index.html

Has anyone ever used them? Or can someone recommend a retailer for Mikuni jets? I wouldn't be opposed to buying a few different sizes and playing around with them.

[psyguy]

well, i stand corrected...
my 850 has got Mikuni#115 stock mains and DJ kit includes DJ#155, 160, 165, that's what I went by in my comment...

i used pj before, was happy with the service and products

[7981GS]

Daniel

[psyguy]

Confusing... That chart doesn't list DJ 155 or 165 but both came in my DJ kit. Where's that chart from?

The difference between Mikuni#115 (stock) and DJ#160 (Stage 3) - as is the case for an 850 - is 12 sizes up??

[AX2007]

well, i stand corrected...
my 850 has got Mikuni#115 stock mains and DJ kit includes DJ#155, 160, 165, that's what I went by in my comment...

i used pj before, was happy with the service and products

I asked if anyone knew, and when I didn't get (an immediate) response, I did what I should have done initially and researched the crap out of it.

If all else fails with this bike, I will definitely add a whole new section to my "Useless Knowledge" file

[AX2007]

Daniel

Thanks Daniel! This helps a lot in figuring out what I should do if these mains don't work...


This forum really has so much knowledge on it. It's awe inspiring.

[AX2007]

Ok... Well, I just found this, and it doesn't seem to line up with the other one:


Width------Keihin # -- 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


Link: http://www.hondaatvforums.net/forums...et-mikuni.html

[7981GS]

Another helpful tool in determining jet sizes:



Daniel

[BigRock]

Hey AX I'm working on my carbs.
Right now:
Pilot Jet 42.5
Main jet 120
I'm trying to find 130 mains.
After adjusting and syncing I'm pretty sure I need the 130 mains.
I wasn't able to do road tests before my tank started leaking.
I've got jet needles 5GL 16, definatly not stock. Trying to figure out whether i need to raise or lower and how to raise or lower them. As you can see only one e clip.

[AX2007]

Hey AX I'm working on my carbs.
Right now:
Pilot Jet 42.5
Main jet 120
I'm trying to find 130 mains.
After adjusting and syncing I'm pretty sure I need the 130 mains.
I wasn't able to do road tests before my tank started leaking.
I've got jet needles 5GL 16, definatly not stock. Trying to figure out whether i need to raise or lower and how to raise or lower them. As you can see only one e clip.

Do you have Dynojet mains, or Mikuni?

And from everything I've read, if you want to make the A/F mixture more rich, you lift the needle, if you want to lean it out, lower it. Here:

http://www.jetsrus.com/FAQs/FAQ_reje...w_to_rejet.htm

http://www.factorypro.com/tech_tunin...m_engines.html

http://www.iwt.com.au/mikunicarb.htm

I think what I'm going to do is get the biggest mains possible, and then worry about the needles. Dynojet recommends putting them on groove number 4 (start counting on the flat end). That's where I'll start, and then I'll go from there.

[AX2007]

Pilot screw still stuck

Ugh.... While trying to get out a completely stuck pilot screw in my #2 carb, the EZ Out bit broke.

Any thoughts? I might be able to get out the EZ out, but that still leaves me with a pilot jet that's really messed up. Is it time to spring for a new set of carbs?

If I do need to get another set of carbs, any alternatives to the stock set? Remember, I have pod filters and a 4-1 exhaust that came with the bike...

[7981GS]

Soak that pilot jet overnight or longer and try a left-handed drill bit instead.

Daniel

[platinum2]

might sound crazy but try almost boiling hot water, in a 5 gal bucket soak the carbs, then it will com out easier,also, if using a easy out on thin walled things you might want to try something different and use easy out only as last effort, the thin walls will push out and grip what ever your removing it from even harder,i broke a easy out this way lol