I"m gonna post this question on a coupla Forums. I know there are some really good carb guys out there.
So heres the story. Holly 4000 teapot that stumbles off acceleration.I know these carbs really well (apparently not well enough) so I have addressed all the usual items.
Float level is adjusted properly,fuel level is correct. It starts and runs with no problem. It goes like hell if you mash it to the floor.
Its just got this off idle hesitation on normal gas pedal pressure.
The pump shot is slow on acceleration. I have replaced the accelerator pump and rod assembly (twice).There is a pump discharge needle that I have discovered comes in some different lengths and weights.
I have tried different pump discharge needles with no success.
The pump link lever is positioned in the short hole allowing for an immeadent and longer pump shot.
I have a good pump shot but its not immeadent enough.
Could this be the butterflys opening before the pump shot?
My question is "Is there anyway to hasten up the pump shot" ?
Thanks to all.
Oldmics

Oldmics.  Below are three previous postings from Ted that may be of help with this problem.

Click the links below and also read the other points made by other Forum members on the same subject.

http://forums.y-blocksforever.com/FindPost128054.aspx

http://forums.y-blocksforever.com/FindPost122753.aspx

http://forums.y-blocksforever.com/FindPost130028.aspx

Hope this helps.  

Regards,
Charlie


NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York