fine tuning my webers

[onefastmustang]

Originally Posted by ENTDOC

so it is a windsor based motor I presume? 2500 stumble is the classic weber gremlin. We need your jet sizes and E tube type as well as pump jet size. Without that info no one can help

Hi

Yes it is a windsor motor. It is a 69 block I pulled from a wrecked 69 Mustang. Here is what the current setup is.

Main Venturi: 37
Aux Venturi: 3.5
Main Jet: 155
Emulsion Tube: F7
Air Corrector: 175
Idle Jet: 75F10
Idle Jet Holder: 120
Pump Jet: 50
Exhaust Valve: 000
Needle and Seat: 2.00

Thank you for all of your help.

Michael

[ENTDOC]

I would look into 40mm venturies at some point but for now I then to think your mains are too small, so I would go up to 165 and also raise you air correctors to 200 or so(they should not affect 2500 stumble but may help keep top end good. Since your problem is at the transition point you have to consider different emulsion tubes also but go with the simple and cheaper thing first. Do you have 2 or 3 progression holes? If 3, drop your idle jet to 170, if 2 stay where you are. Make sure plugs are ok and carbs are balanced. I always start with new plugs when making changes.