I got the motor completely torn down and the cases cleaned up this weekend. I started putting the gearbox back in but need some seals and gaskets to show up before I can get too serious. Looks like the ball retainer in one of the crank bearings came apart and chewed up the crank seal, so the motor was sucking in gear oil, which is why it dropped a cylinder in the first place. Luckily no damage was done to the motor that I can tell. Gaskets, seals, and pistons should be showing up this week.