Drive Chain Set

Hellooo,

My chain was slabby and local service fixed but it is still hit to up things. (i do not know what is called ^^). And service said "your gear may broken". How can i sure about that?

And what is your advice for chain and gear set? (i found this in Turkey; http://www.enduromarket.com/urun/honda-vfr-800-zincir-disli-set_2354.aspx?CatId=272)

Many greetings!