Issue with throttle.

[generic_user2]

Hello everyone, I just acquired a 1970 Beetle 1300 and am currently experiencing some difficulties that require my attention.
Here we have the engine first.
It ran like a champ when I first got it, but as soon as I tried to give it a little throttle while driving, it misfired. I managed to get it to rev up and run smoothly, but it wasn't ideal.
I disconnected the carb, which is a heritage solex replica (probably pict 1), cleaned it thoroughly, and put it back together, but the issue persisted; perhaps there was some improvement.
It sounds like a splutter as the circuit goes from idle to main.
Next on the list was the ignition, which appeared to be outdated. I replaced it with an accuspark electronic ignition setup, and while the problem improved, it was still present.
Everything is running well after I timed it with a strobe.
Does anybody have a clue?
I merely used a toothbrush and some spray to clean the carb, haha.
Ultrasonic, shall we proceed?
Does anything else come to mind when you hear this?
Much obliged.

[STAR89colin]

Do you have the "009" style centrifugal advance or the original style vac advance dizzy?

[generic_user2]

Hi,
A Bosch hoover dizzy was the original equipment, but now it has an SVDA-E.
I turned the dizzy on at 30º btdc and revved it up to around 3k-4k while disconnecting the vacuum line; it ticks over at around 10º.

[KARlosfuentes]

The accelerator pump may still have a clogged passage or a weak shot, both of which the spray cleaner might not pick up. With electronic ignition acting as a mask, it's more likely that there are two minor issues than one major one.

[generic_user2]

Hi,
It seems like I need to remove the carb and clean it with the ultrasonic cleaner; I didn't notice the small holes in the throttle body, but now I see them.
Is the nozzle, which resembles a hooked pipe, located at the top of the carburettor a conduit through which the accelerator pump forces fuel? Perhaps I could remove it and let it air out.

[jameswright77]

One or two ports?

[generic_user2]

Ab engine with twin ports

[jameswright77]

It does spray out of the bent pipe, so you might want to check the volume of the accelerator pump with the 31 PICT 3 carb. Bocar and Brosol were the only high-quality aftermarket options in the past, but now you can find them made in China.

[generic_user2]

Tomorrow I will verify. Thank you.
I think the prior owner may have purchased a replica from Heritage Parts; it is not an authentic solex.

[generic_user2]