im rich......

[tubbyG]

Me with another carb question...I have a standard carb with an enlarged second stage, reduced a/c and 2mm needle.

On boost the car is great and pulls well. But off boost its shocking, lumpy at part throttle and slightly hesitant when waiting fot boost in a higher gear.

The instant I touch the throttle - light or heavy, the afr's go to 10! This is obviously causing awful economy

I have checked for leaks, and reset the acc pump. Where do I go from here, smaller main perhaps??

[Mart]

Assuming the float is working correctly, check the needle valve isn't leaking fuel through even when it's closed.

[tubbyG]

It was a brand new needle valve from german ebay, it was fine when I checked for leaks - only fitted it ladt week. With the old standard 1.7mm needle it was exactly the same as now :(

[Mart]

Ok, next 2 things to check are fuel pressure @ carb, and enrichment cct gaskets.

Remove the carb top/elbow, start the engine, and let it idle - Do you see any fuel dribbling (or maybe pouring :D) into the venturi?

[tubbyG]

Idle is great, sitting between 14 and 15.
Have just got in from replaced the carb body for one with newer gaskets. Ive also double checked the jets.. So now:
120 main
1.3 second stage
Changed a/c from 0.9 to 1.00

Changed needle jet washer and made sure all was good and tight. Gonna be heading out later so will see then if its made any difference

[Jimmy_GTT]

Me with another carb question...I have a standard carb with an enlarged second stage, reduced a/c and 2mm needle.

On boost the car is great and pulls well. But off boost its shocking, lumpy at part throttle and slightly hesitant when waiting fot boost in a higher gear.

The instant I touch the throttle - light or heavy, the afr's go to 10! This is obviously causing awful economy

I have checked for leaks, and reset the acc pump. Where do I go from here, smaller main perhaps??

Are you sure it is also too rich when it is "lumpy at part throttle and slightly hesitant when waiting fot boost in a higher gear"?

Instant touch of throttle the acceleretor jet pumps a squirt. It is normal to see afr 10 for 1-2 sec but not more.

You should check the enrichment circuits at the side of the carb.