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Author Topic: Carb jets  (Read 771 times)

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Carb jets
« on: April 01, 2013, 06:31:39 pm »
Where do you get carb jets for the stock mikuni carb? Also what range of sizes do you need or is it all the sizes in one like a happy meal?
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Re: Carb jets
« Reply #1 on: April 01, 2013, 08:38:39 pm »
You should be able to go to any cycle shop and get those jets. I have 350-600 (bought separately) and a few pilot jets.
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Re: Carb jets
« Reply #2 on: April 02, 2013, 07:33:26 am »
Buy only genuine Mikuni jets,  If you cannot find jets in your area, call us, we have many shelves full of all kinds of jets.
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Re: Carb jets
« Reply #3 on: April 02, 2013, 08:36:00 am »
Awesome thanks Jerry, what about the mikuni jets that are on ebay for like $20 a set for ranges like 300-350 and stuff like that I'm assuming that's main jet numbers I'm pretty clueless on carb set up my dad is a wiz with jetting but he doesn't want to deal with ordering or buying parts.
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Re: Carb jets
« Reply #4 on: April 02, 2013, 10:02:08 am »
Jetsrus.com
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Re: Carb jets
« Reply #5 on: April 02, 2013, 10:13:43 am »
Jetsrus.com only has steps of 20 in the 400 and up sizes.
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Re: Carb jets
« Reply #6 on: April 02, 2013, 11:05:17 am »
Most carburetor manufactures make their jets so that there is approximately a 3% to 4 % change in fuel flow if you move one incremant in main jet or pilot jet size.  Moving the needle one clip will usually affect fuel flow approximately 3% in the throttle position that the needle is the primary control circuit.

Mikuni main jet size numbers represent a flow rate at a particular test specification. (suction on the jet).

Small Mikuni jets have their increments in increments of 5.

Larger Mikuni jets have their increments in incremants of 10

Many years ago I could buy main jets increments of 10 all the way up to 720 and increments of 5 below about 260.  Now they only offer increments of 20 on main jets of 500 and up and increments of 5 below 200.

Going from a 190  to a 195 main jet is a 2.6 % change in fuel flow.

Going from a 200 to a 210 main jet is a 4.8 % change in fuel flow.

Going from a 300 to a 310 main jet is a 3.2% change in fuel flow.

Going from a 400 to a 420 main jet is a 4.8% change in fuel flow.

Going from a 500 to a 520 main jet is a 3.8% change in fule flow.

Going from a 600 to a 620 main jet is a 3.2% change in fule flow.

Going from a 700 to a 720 main jet is a 2.8% change in fule flow.

Lookin at the above information, I think that the trend is easily observed why some jets are offered in steps of 20.

When I am fine tuning I do not like to make more than a 4% change in fuel flow.

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Re: Carb jets
« Reply #7 on: April 02, 2013, 12:59:49 pm »
So, Mikuni still offers increments of 10 in the 400 range?  I am running in the 440 - 460ish range right now with mostly non-Mikuni jets.
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Re: Carb jets
« Reply #8 on: April 02, 2013, 05:49:52 pm »
mikuni jets go to 500 in increments of 10. not sure on higher. Geniune Mikuni jets will have the Mikuni symbol on them. Aftermarket jets tend to be out of tolerence when it comes to the true jet size, meaning they aren't consistant with each other or Mikuni jets. An aftermarket 430 might be more like a 400 or 450.
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Re: Carb jets
« Reply #9 on: April 02, 2013, 06:02:54 pm »
How do you know what jet sizes to buy? I don't want to buy a ton of jets I'm not gonna need. You can tell I've always had someone else set my carbs up, gotta learn sometime right!
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Re: Carb jets
« Reply #10 on: April 02, 2013, 07:01:39 pm »
360-500 on zillas will cover almost all apps with the stock style mikuni carb.
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Re: Carb jets
« Reply #11 on: April 02, 2013, 07:19:26 pm »
What about pilot jets? Cause that range is for main jet in assuming. Again I apologize for my ignorance on this subject.
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Re: Carb jets
« Reply #12 on: April 02, 2013, 07:22:43 pm »
Pilot jets in zilla carbs go in increments of 2.5
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