Variator balls act as a weight which causes the variator plate to move out and variate the engine gear at a particular RPM. More weight results in a lower rpm required to engage the variator, putting you into a higher gear. It is often assumed that removing weight from your variator will result in "more low end," but this is not exactly the case. "Low end," as in, more speed off the line is achieved mainly by tuning your clutch, resulting in more RPMs once the clutch "grabs" and better off-the-line acceleration. Tuning your variator with less weight will only help keep you in low gear longer, which may be useful for climbing hills or if you've got a ported-kitted and piped bike, tuning your variator to match your pipe's powerband.
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