my sons 1988 big twin won't start... this is what happins. I charged the battery,turned the switch on...and zing the starter turns freely.I took the solonoid off and it looked a little worse for ware but what do I know I never had a bike with a starter. So I bought another solonoid. Put It on and zing the same sound. No grinding noises, starter or solonoid are not hot to touch,just a free wheeling starter?? Help.