idlebloke

Hi New member, 1st post, seeking advice!! I have a '91 TDM 850 (but guess this could apply to any bike). Bike is running rich and I need to sort that. Got new exhaust downpipes and after getting the old ones off, the outlet ports are extremely sooty. Other than taking the head off and cleaning whole thing out, any advice on best way to clean these up a bit before I fit new pipes? Any ideas, tips greatly appreciated. Thanks, Peter