So I've had my '08 1200XLC for barely two months and I've developed a pretty good oil leak at the rear piston right at the bottom of the inner rocker cover on the horn/left side (at the corner). So I whip out my HD manual and have at it. I've got the gas tank off, and removed the four bolts holding the upper cover on. I'm thinking it's simply going to be a matter of torqueing the four inner rocker cover screws? But the manual says to rotate crankshaft until both valves are closed....is this why the upper cover won't simply slide off? How do I rotate the crankshaft? And how will I know the valves are closed? The upper cover won't clear the inner components for removal. Any tips, info and cautions would be appreciated.