[NSRCA-discussion] YS 140 FZ: loads up and dies 2500 - 4500 rpm

[Paul Horan]

    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.   
   Another symptom is on the ground running  2500 - 4500 rpm the rpm is not steady. 
Help,
Paul
NSRCA 3606 
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