I have a mid 90's Victa standard that is running rich. It starts first pull, but likes to sit & chugg for 15 seconds, then it goes like a rocket in a cloud of smoke. I have changed plug, air filter & used fresh fuel. I have cleaned the carby & replaced the needle. From the motor to the top of the snorkel appears well sealed & the thottle moves freely. I am out of ideas.
