Comments on my 340 plug under mag

So you added a richer idle via the two idle mix screws? Any idea what the AF is at idle? Mine seems to make my eyes water when if fires up like it’s plenty rich however I am starting to winder if it in fact needs to be more fat as it no longer fires up on the first crank ever and it did with prior tunes.

The me tuin of masking a lean condition with added advance also is making me think about this tune more.

Does an AF even help with these idle tuning questions?


A lean miss will smell like that.

Just because it’s making gas that makes your eyes water at idle doesn’t mean it’s rich.

My advice is put the O2 away for awhile. Learn to tune without it, and then use it after that.

Never tune to a number.