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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Next on the list was the ignition, which appeared to be outdated.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.

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

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.

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.

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.

One or two ports?

Ab engine with twin ports

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.

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.