Harley-Davidson has come a long way in their innovation, and with the new Milwaukee 8 engine, paint, technology HD has almost reached the top to hold off the competition for a moment or two. But to complete its quest for top dog Harley-Davidson is going to have to get rid of their chain primary drive system, it’s a legacy item that’s high maintenance and unnecessary compared to a gear drive. And the 3 hole, 3 oil plug purging system make all Harley’s shift rough and loud.