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?

Re: brand new idle jet seperated
 

Soldered

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.

Joe K

Re: brand new idle jet seperated
 

Where is this flow test kit sold.....??

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.

Tom Endy

Re: brand new idle jet seperated
 

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"

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.

Re: brand new idle jet seperated
 

I would look for an original numbered jet.

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.

Joe K

Re: brand new idle jet seperated
 

here are photos and instructions for the water column I built for flow testing jets.

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 .

Re: brand new idle jet seperated
 

Thank you 160-B Just what I was looking for

Re: brand new idle jet seperated
 

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.

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

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

Re: brand new idle jet seperated
 

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.

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.

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 .