[MrJTP]

A friend has a '65 356 which he complained about running "crappy". Getting a bit worn out on my own 68 911 project I offered to help. First off, almost every nut and bolt on the carbs (Solex) were just a bit more than finger tight and gas was everywhere.

Took off both carbs, cleaned them up, cleaned the jets, tightened the cover on the accel pumps (really loose) and put everything back together with proper torque.

It runs much better now and is easy to start. And it doesn't have gas all over the engine room.

But, one cylinder backfires occasionally below about 2k rpm. Always the same cylinder. We adjusted idle mixture on all cylinders but no change. It was doing this before we worked on the carbs but the engine was running so rough we thought it was part of the overall problem. Less often it gives a muffler bang.

If it matters, its the left side forward cylinder. Sorry I'm not familiar with 356 cyl numbers.

What should we check? He's happy with it like it is because its a lot better but I would like to get rid of the backfire. Maybe avoid burning up a nice looking 356.

Thanks,

Tony