<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV> The problem is a YS 140 FZ that runs fine at idle and 40 to 100% throttle but loads up around 2500 - 4500 rpm. This is especially nasty since that is the rpm range for a smooth takeoff, once it goes to full throttle the engine does not develop full power (about 40% power) and dies. Plenty of smoke trail so it is not going lean. </DIV>
<DIV> Another symptom is on the ground running 2500 - 4500 rpm the rpm is not steady. </DIV>
<DIV>Help,</DIV>
<DIV>Paul</DIV>
<DIV>NSRCA 3606 </DIV></td></tr></table>