I just rebuilt my continental F227 6 cylinder in my machine, I tried to fire it today, the starter was engaging, but the motor wasnt turning over..So I loosened the bolts that mount the motor to the Hydraulics, and the motor turned over, but it turned very slow, kinda like the battery was weak..I put a new battery in it, and it still turned over the same.. I checked the ground, and that was good...NOW, could the hydraulic system be air bound, causing it to turn over hard...I drained the whole system, changed all hoses, and rebuilt the cylinders...If someone has any Ideas for me, please let me know Thanks Steve