on the 69 112 with hh-100 I think I need to pull the head "clean" the top of the valves and maybe put on a new head gasket. this engine runs, I just refreshing the tractor and would like to do what I can to engine, I'm sending carb off to carb rescue for attention. my question is am I doing the engine good by just pulling the head and seeing what it looks like and give it some attention? i'm thinking I need to because I pulled the plug and I can see carbon if that's the right word in the spark plug hole. but I have researched the Tecumseh engines today, read forums, understand the issue with getting parts, and also understand my limitations on ability to work on the internals of an engine, not that I'm not wiling but man I would need some coaching!! so tell me what you would suggest, what to look for if I pull the head, what I can do to help it while I'm there, and I want to make sure I'm not going to cause more harm by trying to pull head and researching, thanks for any advice. Matt.