Ready to Run motors come from the factory on a very rich setting. You may want to turn the High Speed Needle in about half turn for now to help get it started. The manual will give you the factory settings but I have found that I have had to turn the high speed in to get it started. Don't go over 210 to 220 degrees f at the start but do try to cycle engine for 2 minutes as close to 200 as you can for about 4 tanks.
The break in period of motors takes some time but you will find it worthwhile.