One new camshaft oil seal, one gasket, one O-ring (total cost less than a tenner), and 40 minutes' work, most of which was cleaning off the old gasket. And I have a no-longer-incontinent XS650. An' it's gorgeous. Even Timo was impressed. Mind you, as he's ridden it, that now means a blow-up is imminent. I think it would be great to take it to Chimay next year....