I'm not sure what you are getting at,, but if you mean to stop the tires from spinning i think they pretty much spin all the time when off the ground.. but when you set it on the ground while running it should stand still without trying to edge forward and this is acheived by turning the idle screw... hope this helps!!
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i'm with Ketch & hoping that you meant ....."in addition to running & beating my savage everyday, i start it 1 a month....." j/k bro. just started a bud's xl wheels up yest & the tires spun until we turned down the throttle trim on the r/c Tx so that the mill wasn't turning enough power to engage the clutch shoes. if the trim adj doesnt do the trick, follow nitroaddict's advice and tweak down your idle screw a bit