Large rpm drop

Charlesvolare said
I'm almost certain it's drawing off the main circuit at idle with how rich it is. 12:1

I doubt it's pulling off the mains at idle.

Stop STOP using the O2 to get the tune correct. You are trying to live up to a number.

Learn to read plugs first, and then use the O2 to tune with.

I'm doubting you are at 11:1 and if you are, that isn't the cam I'd have picked.

What plug are you using?