Gearbox
 

Hi.
I am trying to get the most pover of my engine, but I am begining to ask myself if I shouldn`t change my gearbox in the process.
Did any of you change the gearbox?
Is that needed, or it will hold extreme power?
The engaging of my Act cluch is pretty hursh, and this is what got my concearned about the gearbox.
Any input would be grately appreciated.