My 97 FXDL is having a starter problem. It seems when the bike is cold, the starterworks OK.After riding a bit and the bike is warm, or if Istart the bike 3 to 4 times within an hour, thejackshaftspins but will not engage all the way.It seems this sort of problem happens about every 15,000 miles. Is therea better starter out there, or do I just need to expect to replace the starter every so often.