I am telling abt the whole set includind cap no. plate light etc
& to tight tappet valve you have to open the engine head that also when the engine is stone cold if you don't know nothing abt it is better to go to svc or any good experienced mech
y some time I also get irritate but it is good to let the tappet loose to get the RTR ( race throttle responce )effect if it becomes too loose then you could go for it