I recently bought a 77 J model that will not true out any better than 138kts. I didn't buy a mooney to do 138kts. I don't think it's rigging, the plane tracks and trims out great and everything seems to close up nicely, yes I put it on jacks and checked the gear. The engine has a little over 800hrs on it and all pistons are above 70. The prop is a hartzell schimitar with 250hrs on it. During a static run we could barely reach 2400rpm. We adjusted the prop to reach 2700 but made no difference in cruise. We cleaned gapped and rotated the spark plugs, also had a small intake manifold leak fixed but all in all everything looks really nice. The engine starts well and runs smooth. Can anyone help account for the loss of rpm and nearly 25kts slower cruise speed? Could it possibly be a problem with the prop which I doubt? I am outside of Charlotte NC can anyone recommend a good engine shop near by?