[zimmy]

Dlamp:

As some of you will recognize, I have been doing the Weber issues for a long time as well. I have learned a little along the way as well. The Spanish Webers are indeed different. The idle mixture screws for example are physically different with different diameters and taper. Small amounts but it matters. I have found and others have confirmed that these carbs prefer the mixture screws to be turned out 1 1/2 to 2 turns instead of the gospel 3/4 turns!

I have the Spanish ones and mine are set for about 1 1/2 to 1 3/4 turns. Smooth idle and no backing down backfires. Go with what works for your car. The mix of both nations may be a challenge to figure out but should be doable.