Aircam with 1 Rich Engine

Hi,

I'll be doing the condition inspection coming up in December and I have one (left side) engine running noticeably richer than the other side. For context, I'm at 7000 feet altitude and I get a lot of carbon on the tail feather for the pilots side, and it uses a little more fuel than the right side engine. The left engine takes noticeably longer to warm up to temp compared to the right engine. Oil consumption is similar for both engines.

I'm assuming the carbs on the left will need to be leaned a bit, but I've not had to make any adjustments up till now and was hoping for some direction and insights.

I appreciate any and all help.

Mark