Thread: 1976 S3 Petrol 'Surging/Hopping' Up Hills & 'Cold Start' Question

Originally Posted by JDNSW

This probably fits in here!

On Monday the 2a was playing up - rich mixture, had to be carbie.

Since I needed to use it today, I looked at it yesterday.

Looking down the trhroat with the engine idling, you could see fuel coming in round the edge of the choke venturi. I pulled it to bits and reassembled it three times before it started working properly. I found nothing wrong, and changed nothing. I suspect the issue was the O-ring, but I don't know what I did that fixed it.

Now running like clockwork!

He he he, I do my best to only do one change at a time when diagnosing problems, but sometimes with these British machines, we still end up with a mystery problem. A solved problem, but it will remain a mystery nonetheless. I fully expect my original problem to come back at any time.

Originally Posted by Cowboy Don

He he he, I do my best to only do one change at a time when diagnosing problems, but sometimes with these British machines, we still end up with a mystery problem. A solved problem, but it will remain a mystery nonetheless. I fully expect my original problem to come back at any time.

I know what you mean!
I had a few BSA Bantam motorcycles as a kid, and they cold have fuel, spark, air, and compression, all at the right time, but they still wouldn't go!

Cheers, Mick.