Look comparing a gear driven trans to a cvt is like comparing apples to oranges however they are both fruit just like the traditional vs the CVT. If you take your car or truck on the highway with say a 3 spd auto or manual trans and drive all is good but if you put the trans in 2nd and drive on the highway will you need to shift into 3rd for it to drive normally? The same is true with a cvt trans. By replacing with lighter rollers you are in effect changing the transmission gearing. With the stock setup from idle 1000 rpm to hit the throttle and at 1100rpm the buggy starts to move, the belt will reach the top of pulley at 5000 rpm high gear. Since the engine is 2500 rpm lower than the max power the buggy will continue to accelerate until peak rpm of 7500. After 7500 rpm the engine will make no more power so in the case of a no rev limit cdi the rpm's may rise the engine cannot produce any more power. Now lets put lighter rollers in say 14 to 12 gram rollers. Starting from idle 1000rpm now you accelerate and the buggy starts to move at 2000 rpm 900 rpm higher than stock. When the belt reaches top of pulley the engine is at 6000 rpm. Now the engine will only increase power for 1500 rpm which will give you a lower top speed. Now there are only 2 ways to compensate the loss. One is to replace the variator with a performance variator which is if I remember correctly 2mm larger diameter or by building engine in such way as to increase the power curve so the engine will continue to make power above 7500 rpm.
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