[olddog]

Afr at idle typically was a bit rich 14.2ish with a carb. However you need to understand that the cam matters. Large valve overlap causes unburned air fuel to be pulled into the exhaust. A wide band O2 will see this air and report a false lean afr. So the O2 is working correctly, but you have to understand the what is happening or it will lead you astray.


So the person who told you to set it too lean, either understands this and knows your engine, or doesn't know know didly. I'll let you figure out which.