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In this Discussion
- 35Terra June 2009
- 37 Terraplane#2 June 2009
- Billy K.TN. June 2009
- DaveFury June 2009
- Geoff C., N.Z. June 2009
- jjbubaboy June 2009
- rambos_ride June 2009
- TwinH June 2009
WA-1 question
-
Hello All.
I am in the process of rebuilding my 968S carbs and am in need of the small externally mounted spring that keeps the metering rod lever down. They were broken on both carbs when I took them apart. Does anyone know of a suitable replacment as they are not included in the Daytona kits. I can post a picture if necc. to clarify which one I am talking about. Without the spring the metering rod and lever remains fully rasied (under spring tension from within ) regardless of throttle blade position. Any help would be greatly appreciated.Dave W.
What's life without a Hudson? -
Dave,
If I've identified the correct spring - Good news is that its a simple lightweight torsion spring, the parts list breakdown I have shows it included as an assembly
#32 Piston Link and Spring Assembly
Any torsion spring would work provided it near the same size wire and has enough length to thread through the hole on the upper end and wrap around the rod on the lower portion.
Re-using just and old spring might be tough because the upper end is bent to keep it in the sleeve...if you can't find a torsion spring locally (Ace hardware carries a good selection in the specialty bins) maybe I might be able to scratch up some assemblies from my parts - or someone else might have them?
-
rambos_ride wrote:Dave,
If I've identified the correct spring - Good news is that its a simple lightweight torsion spring, the parts list breakdown I have shows it included as an assembly
#32 Piston Link and Spring Assembly
Any torsion spring would work provided it near the same size wire and has enough length to thread through the hole on the upper end and wrap around the rod on the lower portion.
Re-using just and old spring might be tough because the upper end is bent to keep it in the sleeve...if you can't find a torsion spring locally (Ace hardware carries a good selection in the specialty bins) maybe I might be able to scratch up some assemblies from my parts - or someone else might have them?
Dan,
Yup, that's the one. Now without it, the metering rod and lever raises to max lift without the help of the accelerator pump arm. So I assume that this ltttle spring needs to be strong enough to hold down the metering rod and lever, correct?"Dave W.
What's life without a Hudson? -
I'm no expert - don't even have a working one to go off right now....
I don't believe the assembly spring is large enough to provide anything other than cross alignment pressure on the metering rod as it moves up and down inside the jet.
Without the spring and depending on clearances the metering rod would just "flop" around and you'd be lucky to get any consisitent fuel flow throw the jet.
Hopefully now that we've identified the part someone else can chime in. -
As Dan says I think all this Sprihg does is keep the rod from floping around and come off at the top. The lower end of this lever goes down and hooks to a piston like deal that has a spring under it that holds the metering rod in place. Go back a page or 2 and look at the rest of this dia of parts. The kits I got from Dave a while back had these pictures.
-
The very light spring concerned is primarily to keep the little fibre washer located around the metering rod, and over the hole in the float bowl. This is an important little piece, as the inside of the bowl is slightly negative to air pressure, and the washer helps keep things that way. The metering rod is held upwards by the spring under the vacuum piston. Under high vacuum the piston overcomes the tension of the piston sppring, and draws the rod down into the jet. At full trottle the metering rod is lifted up mechanically by the linkage. Just a little on the workings of the WA1. I can probably find you the relevant parts, but would be easier if you can get locally.
Geoff.If you're stuck in a hole, stop digging. -
Geoff C., N.Z. wrote:The very light spring concerned is primarily to keep the little fibre washer located around the metering rod, and over the hole in the float bowl. This is an important little piece, as the inside of the bowl is slightly negative to air pressure, and the washer helps keep things that way. The metering rod is held upwards by the spring under the vacuum piston. Under high vacuum the piston overcomes the tension of the piston sppring, and draws the rod down into the jet. At full trottle the metering rod is lifted up mechanically by the linkage. Just a little on the workings of the WA1. I can probably find you the relevant parts, but would be easier if you can get locally.
Geoff.
Geoff,
So you are saying that the metering rod is normally in the full up position until the egine starts and vacuum pulls it down?Dave W.
What's life without a Hudson? -
DaveFury wrote:Geoff,
So you are saying that the metering rod is normally in the full up posiltion until the egine starts and vacuum pulls it down?
If you look at it again and work the throttle linkage you will see that this is what controls the rod , see Geoff's comments. Bud -
DaveFury wrote:Geoff,
So you are saying that the metering rod is normally in the full up position until the egine starts and vacuum pulls it down?
That is correct.If you're stuck in a hole, stop digging. -
Dave,
I believe I have one (actually found two). How big is it? Maybe an inch overall? If that is the right size then send me an address and you can have it.
I could take a pic and send it but not sure if I can post a pic. Would be better if I had an email.
Jim -
And don't forget about that very small fibre washer. Most people lose this.If you're stuck in a hole, stop digging.
-
Looks close to the brush springs used on racing radio control cars that
should be available at a local hobby shop.
http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAMH0&P=7
Hole in the coil is approx .150" and legs are .5", and they come in varoius
tension ratings.
