Okay I feel kind of dumb asking this cuz I feel like I know the answer and I'm sure it's been asked a hundred times but I couldn't find it. I know when adjusting the valves it says engine should be top dead center on compression stroke. Is there a top dead center exhaust stroke? When both valves are closed then that should be TDC on compression stroke correct? It's kind of hard to see the position of the cam lobes so I can't really go by that.