Ok I have been riding my Honda ( 1966 C110 ) as much as I can lately. But after a half hour or so my spark plug is black. That is even with a new plug.
So what could it be?
I know my airfilter sucks and needs replacing badly
Carb is a little gummed up but not awful, doesn't like to idle but will run.
Could it be carbon build up in the exhaust?
My gas tank is super clean inside no rust.
I have compression, I have gas, and ussually have spark... so what is the fine tune for this ( non 2 cycle ) engine?