yes you need a 10mm socket to loosen the jam nut use a flat screwdriver turn screw in tighten jam nut replace cover.if it surges at high idle you can adjust the bump screw that is the nut just above the plate you just put back on under the nut is a screw loosen jam nut i think in,only take it in just enough to smooth it out,go to much and you just wasted you time turning the full load stop screw.