So on my Yardworks snow king tecumseh engine I'm having issues of my exhaust getting red hot and spitting blue flames. So initially I thought it was the exhaust valve being open at the same time as the intake which is partially true. So at top dead centre both valves are tight shut but on the intake stroke the exhaust valve is not fully closing. So I am wondering if the problem is valve timing or something else. Any help would be great!