I am getting a strange noise when I turn the key to the crank position. The starter or solienod is giving off a noise that continues as long as the key is in the crank position but the engine doesn't turnover. It is not a clicking sound but a loud buzzing sound. Is turning over the engine to hard for the starter, the starter bad, a bad connection or bad ground? It even does this if I take the sparkplugs out. I can get the engine to turn using a wrench but this is hard to do. The engine has not been run since I rebuilt the top end over the winter. Oil is in the engine but I haven't yet gotten the oil to circulate by build up oil pressure.