Carlton Weber carb help

[nisfan]

Hi all just looking for some help with my Carlton , it's the 2.0 CIH engine with a 32/36 dgv fitted, the carbs been rebuilt , setup via an online guide and timed via a timing light.

It is running the best it's been but I still can't seem to get rid of a stutter after coming off the gas then going back on it there's a sort of jerk/delay then it goes unless you slight apply throttle????

Ta

[Asimo]

Accelerator pump problem?

[Pete-M]

Sticking advance / retard mechanism.

[Bren]

Inline fuel filter dirty?

[M'coli]

How big is the stutter? A fraction of a second or a bloody long time?

[nisfan]

Ive heard accelerator pump mentioned before reading up on them, 

Theres a filter fitted to the fuel line in the bay that seems ok, dont know what other one is like.

Its only a fraction of a second but becomes annoying round town

[jonny69]

That hesitation where the engine feels like it momentarily wants to die when you lightly press the accelerator is usually it going lean. It could be the accelerator pump jet a bit blocked, or I'm pretty sure it's a diaphragm that operates it might be perished or overly stretched. Another thing to check is the idle jets aren't blocked. There will be a cluster of little drillings around the throttle butterfly when it's closed - these are the idle circuit for running up to around 2000rpm. Check they're not blocked by poking a bit of wire in them.

[Uncle Jimmy]

Before messing with the carb I'd second Pete M and go electrical, I wonder if your distributor spindle is worn or bob weights moving correctly, I imagine it has a vacuum advance mechanism?

[twosmoke300]

That hesitation where the engine feels like it momentarily wants to die when you lightly press the accelerator is usually it going lean. It could be the accelerator pump jet a bit blocked, or I'm pretty sure it's a diaphragm that operates it might be perished or overly stretched. Another thing to check is the idle jets aren't blocked. There will be a cluster of little drillings around the throttle butterfly when it's closed - these are the idle circuit for running up to around 2000rpm. Check they're not blocked by poking a bit of wire in them.

 

Cough - pedant - progression jets / drillings

[matty879]

is the tickover set to low?

[cort16]

If it's had a carb rebuild the accelerator pump is part of this . I just did it on my cortina as it was leaking,

Did you unplug the advance vacuum line when you did the timing ?

[DodgyBastard]

If it's had a carb rebuild the accelerator pump is part of this . I just did it on my cortina as it was leaking,

Did you unplug the advance vacuum line when you did the timing ?

 

Yes, the vac advance was plugged off when setting the timing.

[cort16]

Is it auto choke ? Mine does this a bit and my half cocked theory is the choke isn't opening up enough so it's running rich .

[DodgyBastard]

Is it auto choke ? Mine does this a bit and my half cocked theory is the choke isn't opening up enough so it's running rich .

 

It's a manual choke, if left on the idle raises enough to hide the hesitation.

[DodgyBastard]

I don't think I have any photos of the carb but here's an under bonnet pic just for the sake of it...

 

DSC_0356 by srblythe, on Flickr

[M'coli]

It's a manual choke, if left on the idle raises enough to hide the hesitation.

Sounds like it's too lean - in days of old a rough idea of what was going on was to pop a sparkplug out and look at the colour of the electrode. I'm sure that the HBOL had comparison pictures in it.

[Eddie Honda]

I'm sure that the HBOL had comparison pictures in it.

Indeed it did: