I bought a 86 VN750 Last year When my batery was low it would spin the starter but it wouldnt kick in to turn the motor over. I put a new batery on it and it started fine for a month. I haven't been able to get it started for a while now unless I pull it or push it down a hill. I put a new maint free bat on it still no luck. I took the starter apart it was a little oily inside but not bad. The brushes in the starter looked fine and it seems OK. Does anyone have an Idea what the problem is?