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[Spridgets] Fouled Plugs

Subject: [Spridgets] Fouled Plugs
From: cbking at alum.rpi.edu (Chris King)
Date: Wed, 26 Jan 2011 08:09:20 -0800
Hmm, I think I have black jets in my 1500 (twin HS4 carbs). I've run
into a similar problem that Frank has (fouled on 3&4). Haven't taken the
carbs off yet to look at it, but this is timely. One more thing to look
at.
 
The carbs are a late FZX series from a UK Midget/Spit that originally
came with waxstats. I think I bought a conversion kit from Burlen
several years ago, so I asssume the jets are correct. Any way to be
sure?

Chris King
http://home.comcast.net/~kvcbk/ 

 <-----Original Message----->

                 From: Peter Caldwell [peter at nosimport.com]
Sent: 1/26/2011 8:56:28 AM
To: spritenut at comcast.net;Spridgets at autox.team.net
Subject: Re: [Spridgets] Fouled Plugs 

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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