The front plugs are supposedly an absolute pig to get at, lots of stuff to remove to get at them. Have you got the original Honda plug spanner as it's really tight for access. Dont know what your mileage is with the bike being a few years old now have you thought about doing a valve check while you have everything moved out of the way? Exhausts pretty easy to adjust by nut, but for inlets the cams would need to come out, dont often need adjustment though.