So what about a hot cams stage 1 or 2 or an off-the-road cam ? Would you run performance vales, buckets, springs etc with them too?

So what IS the % power increase that you can play with safely? I mean just doing the pipes, airbox and pc111 has increased my bikes output by 16-18% which is heaps. Surely that can't put much / too much additional strain on the motor as all one is doing is freeing it up to work more efficiently rather than aggressively modifying it ?