hey all, i've got an older bobcat 52" with a kawi fh601v 19hp. today the mower started running funny... very little power w/blades on. almost felt like it was running on 1 cylinder. i've noticed oil/dirt residue on both cylinders (around the valve covers) and was gonna order valve cover gaskets. my question is, what would/could cause a loss of power? i noticed smoke coming from the cylinder cover... bad head and/or gasket? the machines hour meter stopped working and i figure she probably has approximately 1500 hours on it. hoping you experts may be able to point me in the right direction. hope all is well. have a good one.