Carburetor Issues?

[Yzrider22k]

Looking for some help.

 

I recently got my hands on a 51 B3B. She starts right up and idles fine, however hesitates if you push the throttle fast. 

 

Took the carb off, cleaned, new plugs, no timing issues so I am stumped. My next guess would be a vacuum leak but can’t seem to find any.

 

Am I missing anything blatantly obvious? If you slowly press the throttle it’s fine, but the second you give it gas, she wants to shut off.

 

any help is much appreciated.

[Jeff Balazs]

Sound like you need to rebuild the accelerator pump......and make sure all the internal passages are clean. That is where I would begin at any rate.

Jeff

[Yzrider22k]

Jeff,

appreciate the quick response. 

 

Nick

[Dodgeb4ya]

Check the step up piston too for free up/ down movement.

[Yzrider22k]

Thanks Dodgeb4ya. Piston moves freely up and down. No build up or freezing.

[The Oil Soup]

When you look down the carb and press the throttle do you see a spray of fuel? That would show the accelerator pump is working.

[Jeff Balazs]

Nick;

Once you have it sorted out I highly recommend using an additive in your fuel. The fuel these days can cause issues. I have found a few ounces of MMO in every other tank full works very well.

Jeff

[Yzrider22k]

Thanks for all the comments. When looking down the barrel, fuel is coming out however I wouldn’t call it spraying out.

 

Its more just running down the side of the barrel.

 

thanks for the advice on the additive. 

[Reg Evans]

Yup, sounds like your accelerator pump needs to be replaced. It's a very simple job and you might not even need to buy a new one if you soak the old one in some oil over night. 

That might fatten the leather plunger back up so it'll squirt when it's depressed.

[Dodgeb4ya]

The accelerator pump jet orifice can get plugged up too.You need to check that it is clear of debris.

A strand of copper wire will do.

Edited June 5, 2019 by Dodgeb4ya

[Fernando Mendes]

[Yzrider22k]

Thanks so much gents. Will investigate and report back findings.

[Radarsonwheels]

I rebuilt a couple ball & ball carbs and they worked but probably not as well as sixty years ago. 

 

I ended up getting a repop weber from the stovebolt website. It had 12v electric choke and needed very little adjustment to make my 230 run like new. It started instantly and had great manners. 

 

I liked it so much any time somebody posts on here with familiar carb complaints I sound like an advertisement haha.

 

I hope your pump rebuild goes well but if not...

[Yzrider22k]

Thanks you