Download and READ your engine manual. Make sure it's for YOUR engine. Read it again. Lots of good tips in there like cleaning the cooling fins yearly and say after 5-10 years de-carbonize the cylinder/s. Last two hardly never get done.Yeah, I've been meaning to check the valve lash. I believe it's .005 on both intake and exhaust?
Pull the head. Clean the head of carbon. Same for piston face and valves. Get behind the valves too. New head gasket. LAP THE HEAD AND BLOCK FACE. Check for head flatness.I do have the manual, which is where I got the numbers from.
As for the cooling fins, yes I do clean them yearly. However, I have not decarbonized the cylinders. How is that done?