Or, go through the motions -- lift the tank -- lift the throttle bodies (all cables still attached) -- remove the valve cover -- carefully remove the gasket and inspect -- thoroughly clean the head mating surface to all shiny -- clean the gasket (if good, put back -- if damaged, order new) -- practice measuring your valve clearances (knowledge is power -- adjust if necessary with an
@Bedifferent spring depressor) -- then reassemble carefully following the star sequence in the manual incrementally tightening the bolts. You will need a little sealant in the four half moons. And I recommend following
@Claviger 's practice of tightening the valve cover bolts to 10 nM (the manual calls for 12, and on my bike at least, the bolts have bottomed before that and I'm concerned that more is not better and may lead to deformation of some sort).