I'm with speedracerntrixie, sounds like either the regulator is too rich or there is junk under the seat.

Bye the way, YS engines like lots of nitro; they're easier to tune, turn more top end RPM, will idle slower and my little 110's will idle at 1700 RPM on 30% heli fuel....

If you have more problems, suggest you visit the YS support forum here.