I have a 2006 kx100. I fill up the transmission oil (using Honda gn4 10w40, and fill it half way up the window) and go for a ride, then stop and the oil has drained below the window. I have no idea where it's going, it's almost disappearing. Also, once the bike gets warmed up, it stalls when I pull the clutch in and put it in first gear. I don't know if this is from lack of lubrication from the oil loss? It's just weird because I've cleaned the case and everything and then checked for leaks afterwards and there aren't any. I just put a new top end in and don't feel like having clutch problems, any ideas?