You might run some fuel through your check valve. The oil can gum up it a little. Pumping fuel through it will help clean it out. Also you can pump fuel to both sides of the regulator and it will help this situation as well.

Another trick

with No glow attached. Open the main needle 2 turns more than its set running position( this means you would be like 3.5 to 4 turns open). Open the throttle to full power. Again NO GLOW attached. turn the engine over for a 10-20 secs with an electric starter. You will hear it when the RPMs change and it gets "wet"

Now close your HS needle back down to the running position close the throttle to idle. Apply glow and start.

Works 95% of the time.

Troy Newman
Team YS Performance