Has anybody changed out their sprockets to improve top end speed? I was thinking about doing that because 80% of my riding is on pavement, and the motorcycle RPM's are above 4,000 at 70mph. It seems to be kind of high RPM's, so maybe the sprockets would help lower the RPM's and get a little better MPG's. I was thinking of just changing the size by one tooth, but I don't want it to mess with the off-road capability too much. Thanks.