ang problema talaga sa aftermarket valvespring ay hinde
consistent ang kanilang spring rate (thoug not all aftermarket valvespring)
i tried vixion valvespring, its much better than tk since
rpm of genuine vixion valvespring can reach 12500rpm tested thru veypor tach.
i dont know latest tk's max rpm now, but one i used before is 11500rpm.
btw stock sniper valvespring max is 10,000rpm
for yypang valvespring , i dont know how many rpm it can reach.
using genuine yamaha vixion valvepspring you can assure that
the spring rate of each spring is consistent/the same with the others.
plus its genuine yamaha, guaranteed reliabilty and tested.
besides 12500rpm is really more than enough for not to stress your engine
pero syempre sa mga nag rerequire ng morethan 12500rpm
you can try aftermarket valvesprings that can reach more than that.
just make sure you have your tachometer to really check if it reaches
that rpm.
hinde ko rin alam bakit napuputulan ng valvespring.
siguro mas maganda if i detalye ano ang ginawa ng rider
bago naputol ang valvespring...