OK, another issue I see asked a lot is about different roller weights, different variators, and different contra springs. So I am going to attempt to put it out in simple terms. I drew these pictures real quick, and they are not to scale, but they should work and give you a good idea.
The truth of the matter is, A new variator, spring, and weights WILL NOT increase your vehicles over all power!!!
What it does do is adjust your rate of acceleration, and at what RPM your motor runs at while it is accelerating, and at what speed the motor is reving when you reach the highest gear ratio available.
Now having said both of those things, the key is to have your motor running at about 8000-8500 rpm's consistantly while accelerating. This is where your greatest horsepower is generated. If you are accelerating at 5000 rpm's or 9500 rpm's, this will decrease your acceleration because your horsepower is not at it's peak.
This is achieved through trial and error. Changing your contra spring, and then trying different roller weights is how this is achieved.
In order for you to understand which way you need to go with weights and springs, you must first understand how the entire drive train works.
Lets start with the front pully of the variator. This is where your roller weights and ramp plate are located.