Re:Main Jet Different I.D. sizes from diff makers
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TOPIC: Re:Main Jet Different I.D. sizes from diff makers
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Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Just wondering if anyone else has noticed that the inside diameters on main jets manufactured by different companies are not even close?
I'll keep this short.. I have many different brands of main jets and while doing plug chops on 2-strokes I found this out. They are not even close to each other. What I am trying to say to everyone is be careful if you are fine tuning an engine and have different brands of jets. The main jets I am mostly referring to are Mikuni Vs any no name or a or ab brand jets.
Has anyone else noticed this? |
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Last Edit: 2015/09/30 15:21 By Speedfreek.
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Yes in fact there is a jet comparison chart that should be somewhere in the tech section. It show comparison sizes between Mikuni and Dynojet. When going by the numbers on the side of the jets there is a big difference.
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dave
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Speedfreek wrote:
Just wondering if anyone else has noticed that the inside diameters on main jets manufactured by different companies are not even close?
I'll keep this short.. I have many different brands of main jets and while doing plug chops on 2-strokes I found this out. They are not even close to each other. What I am trying to say to everyone is be careful if you are fine tuning an engine and have different brands of jets.
Has anyone else noticed this?
Do you mean, like there could even be a comparison chart on the Tech Articles page, showing the difference between DJ mains, and Mikuni's? It's possible.
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Mikuni main jets number is the flow rate, NOT the size of the hole.
Other jets numbers ARE the size of the hole in the jet. |
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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davej wrote:
Yes in fact there is a jet comparison chart that should be somewhere in the tech section. It show comparison sizes between Mikuni and Dynojet. When going by the numbers on the side of the jets there is a big difference.
Thank you. I just had a shop owner that told me he would be surprised if there is a difference.
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Beyond the differences mentioned, you can also end up with some one off jets, that are stamped with a size only, that are still sized the same as Mikuni's. Mikuni stamps theirs with a trade mark square in a square, and an "R". The rest(including DJ's), won't have that. It can be a nuisance trying to sort out what is what, if you didn't do the work yourself, or don't know who did, and what they used. |
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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yes been there done thatnot lonely are they different diameters there are different shapes as you can see the funnel above the orifice is different I threw away all my non branded jets they're just not worth the trouble stick with Mikuni and you'll know what can help in the boys here can help you you can buy Mikuni jet for like $34 a piece it's worth every pennyI bought for 4 fun Amazon for like eight bucks there are very few jet sizes you really needas Dave Jay and the boys here will tell you if you have the baron Needles we need a 172.5 main 37.5 PMS idle jet for most set ups except the loudest of exhaust |
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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If you look close the cone depth and angle are also different in them too. Thread sizes, head style , round vs hex, any number of things you don't see. Look at the bottom where they screw in too.  |
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Re:Main Jet Different I.D. sizes from diff makers 2 Years, 4 Months ago
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Thanks CURT for posting that jet size chart.
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