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Question photo with the idle jet in my fingers is weird, it is the only "weird" one in my engine, the other 3 jets look like the jet in the photo next to the blue pad (second photo).
Please see the very tip as they are shaped different
Could someone explain the difference in the idle jets, please
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Most likely different manufacturers or machined at a different time..... If you have no problems with the carbs, run it. There may be some minor flow difference, but I would think the mixture screws should correct that... My .02
I agree with Leon,
Much more important than the shape of the end is the size of the hole. If you take them both to a welding shop, most likely they'll have a set of Oxy/Acetylene torch tip reamers, which are very small files in assorted very small sizes. Something similar might be found at a machine shop, but there you'd be looking for some very small drills.
Either way, at that size they're both measured in thousandths (as are your jets). Try a few until you get one that fits (just) the end hole and then try it on the other jet - they should both have the same size hole in the tip. If not, then I might look for another jet.
Of course, if they weren't causing any run-time problems, then just drive it.
You can buy a jet gauge from C.B. Performance. I used one to check all my jets and they are a nice thing to have in the tool box.
It is the shape of the "tip" that concerns me. I believe that they are the same size however there is a serious difference in the "tip". The Weber 48 IDA is a perfectly machine tool and to have such large difference in the most crucial part of the carburetor seems confusing.
Read Leon's (and Gordon's, and Jack's) advice (above) again. While you're right, they're not machined exactly the same, they were in the carbs and acting the same, right? If you're still not comfortable with it, buy a new set and send me the old ones (I'll reimburse you for the postage)
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PS- The odd one looks like the special racer's "lightweight" model...
I'm still processing "The Weber 48 IDA is a perfectly machined tool"
If one weird jet bothers you (and you believe that it needs to be swapped out), then take Al up on his offer and install a new set of the same size stamped on the side of the others and send the old ones to him.
Really it doesn't matter what shape it is. It's the size of the hole, like the value of a resistor in electrical circuits. If the hole is the same size as the others just forget about it and drive the thing.
Or buy a new set of jets from webercarbsdirect.com. Super fast and inexpensive as well.
