[Cerbin]

I am quite certain that i need to rebuild my Webers on my 1970 911. After numerous attempts at tuning (ie air/fuel, idle adjust, synch.), i still have "spitting" back through the carbs and an occasional back fire out the exhaust. I think there is rubber piece in the carb that has deteriorated. This has to be eating HP and efficiency b/c when it spits, i can feel the engine stutter.

My theory is that the engine is getting too much fuel. There is wet fuel that sometimes comes out of the exhaust. I can't turn down the idle adjust b/c it doesn't idle as it is right now. I think the spitting/popping comes from excess fuel vapor exploding in the carb or exhaust when it gets hot enough.

This has been happening since: The engine was rebuilt w/ new solex cams. The carbs sat out for about a 1 and 1/2 years then put back in.

Well tuning hasn't seemed to work, but give me you thoughts and ideas.

Patrick O'Donnell
1970 2.2 Widebody Coupe