Now with my crappy hearing, I dont hear a tappety tapet. A friend only a couple of weeks ago made known to me that my left exhaust one was noisy. I re set it when engine was cold... as you should, but made no difference. Some engines require themselves to be hot for adjusting, if you do adjust when hot then make sure there is some sort of gap when valve is closed or you could end up burning a valve away.
The job is made so much easier if you have the nut and allen key adjuster. The hex type screws (Allens) are available from C&D or Draganfly and well worth the money spent.