So I bought a late seventies batavus VA and drove it around for a couple of days. On the third day, I started it and it started right up, but it had become considerably louder overnight. It didn't gain or lose any power, but became more ratt-a-tatt-a-tatt and less putt-a-putt-a-put, if you know what I mean. I figured that something had become unclogged, so I don't know if this is a good thing or a bad thing. Anyone have any ideas?