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Old 02-06-2020, 01:56 PM   #1
johnbuckley
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Default brand new idle jet seperated

Just got this out of packet ( froma reputable supplier!) and crikey it just came to pieces!! Which begs the question- what normally keeps the pieces together? Are they soldered? braized? friction fit? thermal shrink? or what?
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Old 02-06-2020, 02:58 PM   #2
160B
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Default Re: brand new idle jet seperated

Soldered
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Old 02-06-2020, 03:08 PM   #3
Joe K
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Default Re: brand new idle jet seperated

As above, soldered. Could be repaired. If you return it for credit/replacement, it probably will be - and re-sold.

Meanwhile you could take the opportunity to "fine tune" this and re-solder it - meanwhile fill the lower end with solder and then re-drill the orifice. This should normally be followed by a "flow test" (there is a kit sold to help you do this too) but many (such as myself) just do the drilling and call it "close enough."

Your choice. Jets you get from most all parts suppliers are notoriously suspect, and subject to defects as befits their sourcing by in large in the Pacific Rim.

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Old 02-06-2020, 03:28 PM   #4
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Default Re: brand new idle jet seperated

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Originally Posted by Joe K View Post
As above, soldered. Could be repaired. If you return it for credit/replacement, it probably will be - and re-sold.

Meanwhile you could take the opportunity to "fine tune" this and re-solder it - meanwhile fill the lower end with solder and then re-drill the orifice. This should normally be followed by a "flow test" (there is a kit sold to help you do this too) but many (such as myself) just do the drilling and call it "close enough."

Your choice. Jets you get from most all parts suppliers are notoriously suspect, and subject to defects as befits their sourcing by in large in the Pacific Rim.

Joe K
Where is this flow test kit sold.....??
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Old 02-06-2020, 03:34 PM   #5
Tom Endy
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Default Re: brand new idle jet seperated

My experience has been that the repo idle jets are pressed together and not soldered. I had one that was sucking air and upsetting the function of the carburetor. I solder the junction of all of them before using. I also flow test all jets before using and solder and re-drill the tips if necessary.

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Old 02-06-2020, 03:40 PM   #6
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Default Re: brand new idle jet seperated

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As above, soldered. Could be repaired. If you return it for credit/replacement, it probably will be - and re-sold.

Meanwhile you could take the opportunity to "fine tune" this and re-solder it - meanwhile fill the lower end with solder and then re-drill the orifice. This should normally be followed by a "flow test" (there is a kit sold to help you do this too) but many (such as myself) just do the drilling and call it "close enough."

Your choice. Jets you get from most all parts suppliers are notoriously suspect, and subject to defects as befits their sourcing by in large in the Pacific Rim.

Joe K
Isn't the US (at least the west coast) on the rim of the Pacific??
IMO, those low cost countries where so many of these components are made are capable of making good stuff - it's just that importers and sellers all want to reduce costs as much as possible so can they maximise profits. You gets what you pays for, they say.
"The benefits of good quality survive long after the cost is forgotten"
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Old 02-06-2020, 03:59 PM   #7
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Default Re: brand new idle jet seperated

When you solder the tip and re drill the hole how do you maintain that concave profile that is so important.
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Old 02-06-2020, 04:46 PM   #8
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Default Re: brand new idle jet seperated

I would look for an original numbered jet.
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Old 02-06-2020, 06:11 PM   #9
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Default Re: brand new idle jet seperated

Sorry. I have seen the "flow testing kit" advertised. But for those who intend to save the money of a kit, here is the setup commonly used. http://www.model-a.org/jet_flow_testing.html

It basically amounts to a controlled "head" of fluid, and timing out the flow into a graduated cylinder. The only technical challenge is creating a repeatable "head" which is what the reservoir accomplishes.

It has been addressed in the literature as well. Tom (above) has contributed to the literature. https://www.brattons.com/media/wysiw..._-_11-2007.pdf

And - while original numbered jets provide SOME assurance of actual flow, only an actual test can assure positively. Original jets can wear, and they can have "deposits" from the gas.

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Old 02-06-2020, 08:36 PM   #10
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Default Re: brand new idle jet seperated

here are photos and instructions for the water column I built for flow testing jets.
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File Type: jpg Column with bucket.jpg (17.6 KB, 59 views)
File Type: jpg Flow Tester.jpg (37.2 KB, 56 views)
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Old 02-06-2020, 10:32 PM   #11
Purdy Swoft
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Default Re: brand new idle jet seperated

I have turned down the nut on the model A idle jet to remove the nut completely . I then shorten the tube to proper length and use it make the power jet for the model B carburetors . Many times the power jet will get broken off from the model B carburetor . The model A idle jet is the correct diameter for this use . Model A idle jets are way less expensive than model B power jets . . I have found a method of turning the nuts down and off with my bench grinder . Some may have difficulty with this so its not for everyone . Just a thought of what has worked for me .
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Old 02-07-2020, 05:09 PM   #12
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Default Re: brand new idle jet seperated

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here are photos and instructions for the water column I built for flow testing jets.
Thank you 160-B Just what I was looking for
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Old 02-09-2020, 12:01 AM   #13
Chuck Sea/Tac
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Default Re: brand new idle jet seperated

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When you solder the tip and re drill the hole how do you maintain that concave profile that is so important.
You touch it up with a drill the size of the tube. If your going into solder, I do it by hand with a pin vise.
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Old 02-09-2020, 08:05 AM   #14
Jim Baskin III Pa.
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Default Re: brand new idle jet seperated

John , This is who I use for all my jets.They are flow tested and are the best.Never had a better running carb.with these jets.

https://www.rennerscorner.com/index.html
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Old 02-09-2020, 09:49 AM   #15
Ed in Maine
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Default Re: brand new idle jet seperated

When you rebuild a carb, you should always flow test the jets. If you don't, you don't know what kind of a job you did! One thing to look out for, is that some jets have the calibrated tip pressed into the end of the tube. Sometimes this will split the tube creating a hair line crack in the tube. This crack will be below the level of gas in the bowl and leak. If you have a carb that doesn't drip but always has a gas smell in your garage, look for a split jet tube. The repair is just solder over the crack. Ed
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Old 02-09-2020, 12:02 PM   #16
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Default Re: brand new idle jet seperated

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Originally Posted by Jim Baskin III Pa. View Post
John , This is who I use for all my jets.They are flow tested and are the best.Never had a better running carb.with these jets.

https://www.rennerscorner.com/index.html

Ditto on that source. When you see the care they take with communicating, and packaging of items that are always top quality you will want them as your primary source for the products they carry.
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Old 02-09-2020, 12:10 PM   #17
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Default Re: brand new idle jet seperated

I put a kit in a zenith back in the 70s and had no power so I pulled it apart and found that one of the jets had an obviously smaller hole so I replaced it with my original jet and the power was back so they really need to be looked at to get original performance. I quit replacing them if they looked good, used to think all the stuff had to be replaced but not so.
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Old 02-09-2020, 12:52 PM   #18
Purdy Swoft
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Default Re: brand new idle jet seperated

I agree , all of the stuff doesn't have to be replaced , I prefer to use original or good used jets than some of the foreign repro jets .
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