Hi Dave, This forum has been a very useful tool thanks to you. I have a newly broken in engine that appears to be problematic. The top end RPM and idle at or below 2000 RPM appears good. The transition between just above idle on up to almost full RPM is extremely rich to the point of erratic to dying. Turning in the regulator adjustment makes no effect. I have followed the YS performance recommended procedure too the tee several attempts. no help. I purchased this engine last year here in the USA.

Should I send it in to you? Thanks in advance...