34 pict 3 accelerator pump adjustment

[Birdmanhere]

If I push the gas all the way down fast in my 1600 dp with a 34 pict on it, it will stumble and hesitate.
The accelerator pump adjustment is right in the middle, do i need to increase it or decrease it a bit? is it getting too much gas right away or not enough?
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66 Bus
71 Bug

[glutamodo]

Usually flat spots on acceleration are due to a lot more than just the adjustment of the accel pump. Other contributing factors can be in the idle mixture adjustment of the carb, overall wear in the carb, a worn distributor - or, and this is common, using the incorrect distributor to go with your carburetor. The factory matched every stock carb up with a specific distributor, and when you go and throw a different one on there, especially the general-purpose "009" you can end up with problems.

But to answer your question about the accelerator pump:

What you want is to adjust it so that you are getting a spray right off the bat when you open the throttle. What throws people off, is that the linkage develops play as the carb ages, and to compensate for it you have to move the adjustment to the "-" side. A lot of people just move it way over to the "+" side assuming they are getting more out of it when really they aren't, and often end up making their acceleration worse.

I adjust them so that all the play is taken up when the throttle is at idle. If the linkage is really worn out, I've seen it where you have to put the adjustment about as far to the "-" side as it'll go. Here's a picture of one that was worn that far (both in the linkage rod you see at the bottom, plus wear not visible in this pic at the pivot on the accel pump cover itself):

With that worn linkage above, if you were to move it all the way over to the "+" side, the accelerator pump would not be spraying at all until you opened the throttle more than halfway... denfinately not desirable!

I robbed a different carb of its pump linkage which was in a little better shape, (although it was the Generator style) and here is where that one adjusted up to take up the play on that same carburetor:

[Birdmanhere]

thanks, I will have a go at it later this afternoon

-the motor has less than 1000 miles on it, all stock AK
-the carb is a rebuilt german unit from the guy on here that re-bushes them with a nice bronze bushing
-dist is a 034 svda, new

oh and it is in a 66 bus
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66 Bus
71 Bug

[glutamodo]

[vwsb74]

[glutamodo]

you're welcome....
And that's just the USA chart. I have much more info in this Word document file:

http://members.trainorders.com/android/temp/CarbBaseFlangeNumbersA.doc

[NayaBeach]

Thanks! I was having some troubles with getting my car to accelerate properly. New carb and all. This made me have a look at the accelerator pump. The lever was loose... Seem to be accelerating happily now. Seem to.
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Roger
Mexican Bug
Puerto Vallarta
"The purpose of life is to enjoy it."