I have a Dolmar PS510 I can‘t get started. I have 110 psi compression, fresh fuel/oil mix, new plug properly gapped, new fuel and air filters. Carb is rebuilt and pressure tested. When plug is grounded to the saw I get good spark. When I try to start I get nothing. When I try to start with starter fluid or a small amount of gas in the cylinder, I get nothing. Not sure where to go from here. Any suggestions Much appreciated.