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Need throttle return spring for HS6 SU carb 444-544

posted by  Danny on  Sat Apr 28 06:32 CST 2007
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last visit: Mon Oct 6 22:01 CST 2014
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On interstate 87, NYS Thruway last night and without warning the engine speed took off revving really high. I shut the engine off, coasted - this is in slow traffic at rush hour, two lanes and a semi behind me. I coast to the edge, not really a breakdown lane, pop the hood and the front throttle return spring has snapped at the head washer. I pull it off and try and bend a loop, metal snaps again. Then I bend an L and put the good end on the head washer and the L on thethrottle (mistake). This has taken less than a minute and off we go. Until it happens again about 15 miles later and this time we're off the thruway, and the spring falls off and is lost, so with 2 small binder clips (holding together my fine sandpaper,emory cloth collection in the toolbox) and an elastic hairband (thanks Connie!) I'm able to rig up another temporary fix. I thought that I had at least one other throttle return spring in my "culch heap", but alas, I can't come up with one! Anybody got a good, unrusted spare they could drop in the mail to me?
thanks
Danny

Contact me offline for address, or if you're in the immediate area (Honeychrome, Kai, Pooch) let me know and I'll come and get it.








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    Need throttle return spring for HS6 SU carb 444-544

    posted by  Ron Kwas on  Sun Apr 29 23:29 CST 2007
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    last visit: Fri Oct 24 04:03 CST 2014
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    Danny;

    Kai has is right...what you are looking for is a spring with a similar "spring constant", that is, a spring which has a similar elongation for a similar amount of tension...and you will get this from a spring with similar wire gauge and geometry...an important thing to watch for also is the number of turns...too few and you reach the springs limit in extension length before your linkage has run out of movement (force starts going up real fast then too)...better too many turns than too few!

    I'd start by asking to see the standard "throttle return springs" at a well stocked automotive place...you might want to take the remaining spring in with you, to match it up...you'll obviously need to gently bend some endloops...finally, I put a piece of teflon sleaving around the end loops to keep them from being worn through (which is likely cause for loosing spring).

    Cheers








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      Need throttle return spring for HS6 SU carb 444-544

      uid 25070's pic
      posted by  Barongrey on  Wed May 2 05:18 CST 2007
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      last visit: Wed Dec 3 15:46 CST 2008
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      I don't know precisely which SU carbs you are running, but I have the HS6's.

      The previous information was all good, but I'd recommend you put a return spring on each carb. Without a return spring, your carb may not return to full idle, considering the 'slop' built into the carb-to-carb linkage.

      Besides, if one fails, you'll still have good control with the remaining one.

      I made both my springs from some generic carb springs. Plenty of turns, so they aren't too strong.

      Good luck!

      Steve








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    Need throttle return spring for HS6 SU carb 444-544

    posted by  longhorizon on  Sun Apr 29 14:20 CST 2007
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    last visit: Sat Oct 18 15:42 CST 2014
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    Danny,

    I was also going to suggest a good hardware store. They usually have a selection of springs off of a display board. That's what I ran on for better than a year. It will definitely get you going but I found that there was no 'perfect match'. The one I chose for the front carb hooked around the clamp for the upper radiator hose. Beware of using springs with too much tension; they'll cause your shaft bushings to wear more quickly.

    Kai S
    '67 Duett








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    Need throttle return spring for HS6 SU carb 444-544

    uid 5098's pic
    posted by  Sil on  Sun Apr 29 03:42 CST 2007
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    last visit: Fri Oct 24 07:24 CST 2014
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    Danny,
    Any hardware store spring of approximately the same dimensions will do. A while ago I limped into a True Value with the aid of a rubber band and a paperclip, got some likely looking springs out of their drawer and fixed the problem right there in the parking lot.
    Bob S.








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    Need throttle return spring for HS6 SU carb 444-544

    posted by  longhorizon on  Sun Apr 29 02:19 CST 2007
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    last visit: Sat Oct 18 15:42 CST 2014
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    Hi Danny,

    I remember having trouble sourcing these as well. If I remember correctly I ultimately bought new ones from VP Autoparts in South Carolina.

    3225 Fortune Drive, STE B
    North Charleston, SC 29418-8476
    USA

    Tel: +1 843 760 0170
    Fax: +1 843 760 0172
    VPInfo@Bellsouth.net

    Christer or Cecilia will likely drop one in the mail to you the same day. I'm not sure I have a spare or not. I won't be back to my car until next weekend.

    Good luck.

    Kai






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