Several decades ago I worked in NJ and we made SU jets for various
companies. Another manufacturer on the West coast also made jets.
They had a large run of them that were not crimped into the plastic
right angle bit very well, and some were shorter and some were
longer. They should all be the same length. There are only 2
different .090 jets. The black ones for all BMC applications, and the
red ones for Triumph Spitfires, predominately. And that difference is
only the choke linkage hook-up boss, which the newer vendors have
alleviated with a different design. (Spitfire manifolds have the
carbs horizontal, where BMC applications typically are angled)
You must have had a N.O. S(hite) jet! (made in the US,
btw;-) (look at the very bottom of the plastic where it angles. You
should see a letter. Let me know if it is an "s")
Peter C
===
At 08:08 PM 1/25/2011, Frank Clarici wrote:
>Budget Midget, 1.25 SUs as stock.
>I put maybe 5 miles on the car, I fouled the plugs just setting it
>up and I figured, too rich, too much choke, too much cold starting
>while working on the car.
>So I changed the plugs, went on the maiden voyage over the weekend,
>maybe 5 miles round trip to see what might fall off, or needs attention.
>When I got home it was running rough, 1& 2 cyls were dead.
>Fouled plugs again. Hmmm, lean it out to where it barely runs with
>new plugs and it doesn't run good.
>So tonight I dug deeper, float level was fine, compression perfect,
>both carbs synched but I just couldn't understand why the front
>carb was way rich until I took off the dashpot and piston to see the
>jet tube about 1/4" lower than it should be. WTF? I can not adjust
>it up, the linkage is correct and the rear carb jet is where it should be.
>After a full tear down of the carb and looking at a couple others, I
>discovered the jet was 1/4 inch shorter than the others I had on hand.
>So a quick rebuild of another carb and now the Midget runs
>absolutely perfect. 700 rpm idle and smooth, and lots of guts on the
>road where it had some hesitation before.
>So are there different length .090 jets? This came in the carb, not
>a new one I don't think, it looks real new but like everything else
>I have, it may have been new in 72 and not used. Or, that's why I
>got the carbs or whole car cheap, it had issues like short carb jets :)
>So does anybody know if there are different length carb jets?
>This would need a different carb body or maybe somebody hack sawed
>it off back in the day.
>--
>Frank Clarici
>Toms River, NJ
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