I'm trying to fix this old saw. Last week it was idling great but died as soon as i touched the throttle. I then cleaned out the carb and put it back together, would not fire at all, backfired and smoked once. There is blue spark and it is wet after several pulls. Removed the spark plug and pulled it with open throttle several times in case it was flooded. No start. Spark plug is a BPMR7A. I even tried starting fluid and still no start. Ignition coil is new so i don't think its that. I don't have a compression tester but it is more difficult to pull than my Husqvarna 435 and pulls easily without the spark plug in. Spark arrestor is clean.