Phillip, I know others have said that the throttle plates must be a close
fit, but I have found that if they do close right up then they seem to stick
and make for a very "jumpy" throttle.
Your symptoms sound like it is running a weak mixture. If the spindles are
a good fit check out the carb to manifold joints, and the manifold to
cylinder head.
Also, are the fuel jets and needles set right?
Guy
----- Original Message -----
From Philip Hubbard <hubbard at idir.net>
To: <spridgets@autox.team.net>
Sent: Saturday, January 08, 2000 12:51 AM
Subject: Poppet Valve Thanks and Progress Report
> A big thank you to the list for the great advice concerning soldering up
> the poppet valves on my HS2 (AUD549) carb throttle plates. I got a decent
> gun from my dad, took the throttle plates out of the carbs (duh) and went
> to town. I think they came out pretty decent.
>
> But a serious problem persists - the car races along at around 3000 RPM
and
> sometimes drops for a few seconds and then races back up no matter what I
> do. From various things I've heard on the list and looked into here, I
> think the problem may lie in the throttle plates. I don't get a good seat
> top and bottom when the throttle is closed - there is daylight both at
> 12:00 and at 6:00 on the throttle plate. I experimented to see if I had
it
> in upside down or backwards, but everything left the same bad seating.
> Would this cause such an RPM problem? BTW, I have extremely little to no
> throttle shaft wiggle.
>
> Another symptom - carburetor backfire (though adjusting of the jets seemed
> to mitigate that away. Can radically too weak or rich a mixture result in
> carb backfire?
>
> So, I went to VB (15 min away) and bought some new old style plates with
no
> poppet valves. Same bad fit. I have an extra set of HS2s (AUD404) though
> they need some serious cleaning up to be able to use. But the throttle
> plates fit very snugly in these. Took out the plates and put in the old
> style plates I just bought - also fit snug. I'm beginning to think that
> there is a slight but important difference between AUD549 carburetors and
> all others. This would fit with the VB catalog which shows a different
> part number for AUD549 and then the same for AUD404, 328, and 266.
>
> I'm going to try to see if I have any other good sets of carbs over at my
> dad's with my projects. If I've got a clean set, I would just as soon
bolt
> them on, get running and continue to work on this other set with list
> advice. This is my daily driver we are talking about after all. :)
>
> Thanks for wading through the verbage, but I wanted to say thanks and give
> a full picture of where I'm still struggling.
>
> Philip
> 1974 Damask Red Midget - Arioch, Lord of Chaos
> 1960 BRG Bugeye Sprite - First up for restoration
> 1973 Damask Red Midget - Project car for sale
>
>
|