Report "I have a 21.2 cc engine mantis #7225-16-03 and the issue I have is after the motor warms up and I try to turn the choke off and rev the motor up it stalls out. I was told perhaps the spark arrestor was clogged and before i remove that I would like some advice. The unit has less than five gallons through it, we use the oil purchased from Mantis and keep the fuel clean, mixing ratio is 50-1. Spark is good , plug is fine. Please respond with your advice"